ORCID Profile
0000-0002-8500-9148
Current Organisations
Universitas Padjadjaran
,
RMIT University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Electrochemistry | Sensor technology (incl. chemical aspects) | Functional Materials | Analytical biochemistry | Industrial biotechnology | Materials Engineering | Nanobiotechnology
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in Technology |
Related Links
Publications
Moving forward in plant food safety and security through NanoBioSensors: Adopt or adapt biomedical technologies?
Publisher: Wiley
Date: 17-04-2015
Abstract: Plant-based foods are integral part of our day-to-day diet. Increasing world population has put forth an ever increasing demand for plant-based foods, and food security remains a major concern. Similarly, biological, chemical, and physical threats to our food and increasing regulatory demands to control the presence of foreign species in food products have made food safety a growing issue. Nanotechnology has already established its roots in erse disciplines. However, the food industry is yet to harness the full potential of the unique capabilities offered by this next-generation technology. While there might be safety concerns in regards to integration of nanoproducts with our food products, an aspect of nanotechnology that can make remarkable contribution to different elements of the food chain is the use of nanobiosensors and diagnostic platforms for monitoring food traceability, quality, safety, and nutritional value. This brings us to an important question that whether existing diagnostic platforms that have already been well developed for biomedical and clinical application are suitable for food industry or whether the demands of the food industry are altogether different that may not allow adoption/adaptation of the existing technology. This review is an effort to raise this important "uncomfortable" yet "timely" question.
Donor-Induced Performance Tuning of Amorphous SrTiO 3 Memristive Nanodevices: Multistate Resistive Switching and Mechanical Tunability
Publisher: Wiley
Date: 14-04-2015
Importance of Phase Purity in Two-Dimensional β-Co(OH)2 for Driving Oxygen Evolution
Publisher: American Chemical Society (ACS)
Date: 18-08-2022
Genus-Wide Physicochemical Evidence of Extracellular Crystalline Silver Nanoparticles Biosynthesis by Morganella spp
Publisher: Public Library of Science (PLoS)
Date: 21-06-2011
CHAPTER 23. Nanozyme-Based Environmental Monitoring
Publisher: Royal Society of Chemistry
Date: 2017
Transferrin-conjugated quasi-cubic SPIONs for cellular receptor profiling and detection of brain cancer
Publisher: Elsevier BV
Date: 10-2019
Role of Fungi Toward Synthesis of Nano‐Oxides
Publisher: Wiley
Date: 10-04-2015
Biological shape-controlled synthesis of silver nanoplates
Publisher: IEEE
Date: 02-2010
Acoustic-Excitonic Coupling for Dynamic Photoluminescence Manipulation of Quasi - 2D MoS 2 Nanoflakes
Publisher: Wiley
Date: 12-03-2015
A new paradigm for signal processing of Raman spectra using a smoothing free algorithm: Coupling continuous wavelet transform with signal removal method
Publisher: Wiley
Date: 25-01-2013
DOI: 10.1002/JRS.4232
Detection of pesticides using nanozymes: Trends, challenges and outlook
Publisher: Elsevier BV
Date: 11-2021
Green Synthesis of Nanomaterials Using Biological Routes
Publisher: Wiley
Date: 29-08-2015
Photomodulation of bacterial growth and biofilm formation using carbohydrate-based surfactants
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6SC03020C
Abstract: The photocontrollable antibacterial and biofilm modulatory activity of a panel of light responsive carbohydrate-based surfactants is reported.
Oxygen-deficient photostable Cu2 O for enhanced visible light photocatalytic activity
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NR08388B
Abstract: Large-scale synthesis of O-deficient Cu 2 O with outstanding visible photoactivity is shown.
Competitive Inhibition of the Enzyme-Mimic Activity of Gd-Based Nanorods toward Highly Specific Colorimetric Sensing of l -Cysteine
Publisher: American Chemical Society (ACS)
Date: 05-09-2017
DOI: 10.1021/ACS.LANGMUIR.7B01926
Abstract: Gd-based nanomaterials offer interesting magnetic properties and have been heavily investigated for magnetic resonance imaging. The applicability of these materials beyond biomedical imaging remains limited. The current study explores the applicability of these rare-earth nanomaterials as nanozyme-mediated catalysts for colorimetric sensing of l-cysteine, an amino acid of high biomedical relevance. We show a facile solution-based strategy to synthesize two Gd-based nanomaterials viz. Gd(OH)
Cationic Amino Acids Specific Biomimetic Silicification in Ionic Liquid: A Quest to Understand the Formation of 3-D Structures in Diatoms
Publisher: Public Library of Science (PLoS)
Date: 03-03-2011
Aqueous phase synthesis of copper nanoparticles: a link between heavy metal resistance and nanoparticle synthesis ability in bacterial systems
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2NR32887A
Abstract: We demonstrate aqueous phase biosynthesis of phase-pure metallic copper nanoparticles (CuNPs) using a silver resistant bacterium Morganella morganii. This is particularly important considering that there has been no report that demonstrates biosynthesis and stabilization of pure copper nanoparticles in the aqueous phase. Electrochemical analysis of bacterial cells exposed to Cu(2+) ions provides new insights into the mechanistic aspect of Cu(2+) ion reduction within the bacterial cell and indicates a strong link between the silver and copper resistance machinery of bacteria in the context of metal ion reduction. The outcomes of this study take us a step closer towards designing rational strategies for biosynthesis of different metal nanoparticles using microorganisms.
α-synuclein as a promising biomarker for developing diagnostic tools against neurodegenerative synucleionopathy disorders
Publisher: Elsevier BV
Date: 02-2002
Cobalt Sulfide Nanosheets as Peroxidase Mimics for Colorimetric Detection of l-Cysteine
Publisher: American Chemical Society (ACS)
Date: 12-2021
Emerging applications of metal-TCNQ based organic semiconductor charge transfer complexes for catalysis
Publisher: Elsevier BV
Date: 12-2016
Aptamer-mediated “turn-off/turn-on” nanozyme activity of gold nanoparticles for kanamycin detection
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CC07275H
Abstract: A new ultrafast and highly sensitive ‘turn-off/turn-on’ biosensing approach that combines the intrinsic peroxidase-like activity of gold nanoparticles (GNPs) with the high affinity and specificity of a ssDNA aptamer is presented.
Photochromic polyoxometalate–based enzyme-free reusable sensors for real-time colorimetric detection of alcohol in sweat and saliva
Publisher: Elsevier BV
Date: 08-2021
Soft Exfoliation of 2D SnO with size-dependent optical properties
Publisher: IOP Publishing
Date: 08-06-2017
Ionic liquid mediated synthesis of nitrogen, carbon and fluorine-codoped rutile TiO2nanorods for improved UV and visible light photocatalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4RA14510K
Abstract: The application of [BMIM][BF 4 ] ionic liquid as a designer solvent for the synthesis of multiple nonmetals-codoped rutile titania nanorods is presented. These nanorods show remarkable photoactivity under UV and visble light conditions.
Skin color-specific and spectrally-selective naked-eye dosimetry of UVA, B and C radiations
Publisher: Springer Science and Business Media LLC
Date: 25-09-2018
DOI: 10.1038/S41467-018-06273-3
Abstract: Spectrally–selective monitoring of ultraviolet radiations (UVR) is of paramount importance across erse fields, including effective monitoring of excessive solar exposure. Current UV sensors cannot differentiate between UVA, B, and C, each of which has a remarkably different impact on human health. Here we show spectrally selective colorimetric monitoring of UVR by developing a photoelectrochromic ink that consists of a multi-redox polyoxometalate and an e − donor. We combine this ink with simple components such as filter paper and transparency sheets to fabricate low-cost sensors that provide naked-eye monitoring of UVR, even at low doses typically encountered during solar exposure. Importantly, the erse UV tolerance of different skin colors demands personalized sensors. In this spirit, we demonstrate the customized design of robust real-time solar UV dosimeters to meet the specific need of different skin phototypes. These spectrally–selective UV sensors offer remarkable potential in managing the impact of UVR in our day-to-day life.
Galvanic replacement of anions in metal-organic semiconductors: a spontaneous redox reaction between TCNQ1− and TCNQF40 (TCNQ = 7,7,8,8-tetracyanoquinodimethane)
Publisher: Elsevier BV
Date: 12-2022
Divergent response of homologous ATP sites to stereospecific ligand fluorination for selectivity enhancement
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7OB00129K
Abstract: Enhanced selectivity for homologous ATP sites by composite chemical and conformational perturbation by stereospecific fluorination.
Repairing and Preventing Photooxidation of Few-Layer Black Phosphorus with β-Carotene
Publisher: American Chemical Society (ACS)
Date: 24-04-2023
Nanostructured silver fabric as a free-standing NanoZyme for colorimetric detection of glucose in urine
Publisher: Elsevier BV
Date: 07-2018
DOI: 10.1016/J.BIOS.2018.03.025
Abstract: Enzyme-mimicking catalytic nanoparticles, more commonly known as NanoZymes, have been at the forefront for the development of new sensing platforms for the detection of a range of molecules. Although solution-based NanoZymes have shown promise in glucose detection, the ability to immobilize NanoZymes on highly absorbent surfaces, particularly on free-standing substrates that can be feasibly exposed and removed from the reaction medium, can offer significant benefits for a range of biosensing and catalysis applications. This work, for the first time, shows the ability of Ag nanoparticles embedded within the 3D matrix of a cotton fabric to act as a free-standing peroxidase-mimic NanoZyme for the rapid detection of glucose in complex biological fluids such as urine. The use of cotton fabric as a template not only allows high number of catalytically active sites to participate in the enzyme-mimic catalytic reaction, the absorbent property of the cotton fibres also helps in rapid absorption of biological molecules such as glucose during the sensing event. This, in turn, brings the target molecule of interest in close proximity of the NanoZyme catalyst enabling accurate detection of glucose in urine. Additionally, the ability to extract the free-standing cotton fabric-supported NanoZyme following the reaction overcomes the issue of potential interference from colloidal nanoparticles during the assay. Based on these unique characteristics, nanostructured silver fabrics offer remarkable promise for the detection of glucose and other biomolecules in complex biological and environmental fluids.
Molecular Dynamics Pinpoint the Global Fluorine Effect in Balanoid Binding to PKCϵ and PKA
Publisher: American Chemical Society (ACS)
Date: 27-01-2018
Abstract: (-)-Balanol is an adenosine triphosphate mimic that inhibits protein kinase C (PKC) isozymes and cAMP-dependent protein kinase (PKA) with limited selectivity. While PKA is known as a tumor promoter, PKC isozymes can be tumor promoters or suppressors. In particular, PKCε is frequently involved in tumorigenesis and a potential target for anticancer drugs. We recently reported that stereospecific fluorination of balanol yielded a balanoid with enhanced selectivity for PKCε over other PKC isozymes and PKA, although the global fluorine effect behind the selectivity enhancement is not fully understood. Interestingly, in contrast to PKA, PKCε is more sensitive to this fluorine effect. Here we investigate the global fluorine effect on the different binding responses of PKCε and PKA to balanoids using molecular dynamics (MD) simulations. For the first time to the best of our knowledge, we found that a structurally equivalent residue in each kinase, Thr184 in PKA and Ala549 in PKCε, is essential for the different binding responses. Furthermore, the study revealed that the invariant Lys, Lys73 in PKA and Lys437 in PKCε, already known to have a crucial role in the catalytic activity of kinases, serves as the main anchor for balanol binding. Overall, while Thr184 in PKA attenuates the effect of fluorination, Ala549 permits remote response of PKCε to fluorine substitution, with implications for rational design of future balanol-based PKCε inhibitors.
Low-temperature fabrication of alkali metal-organic charge transfer complexes on cotton textile for optoelectronics and gas sensing
Publisher: American Chemical Society (ACS)
Date: 15-07-2015
DOI: 10.1021/LA501446B
Abstract: A generalized low-temperature approach for fabricating high aspect ratio nanorod arrays of alkali metal-TCNQ (7,7,8,8-tetracyanoquinodimethane) charge transfer complexes at 140 °C is demonstrated. This facile approach overcomes the current limitation associated with fabrication of alkali metal-TCNQ complexes that are based on physical vapor deposition processes and typically require an excess of 800 °C. The compatibility of soft substrates with the proposed low-temperature route allows direct fabrication of NaTCNQ and LiTCNQ nanoarrays on in idual cotton threads interwoven within the 3D matrix of textiles. The applicability of these textile-supported TCNQ-based organic charge transfer complexes toward optoelectronics and gas sensing applications is established.
Bacterial Kinetics-Controlled Shape-Directed Biosynthesis of Silver Nanoplates Using Morganella psychrotolerans
Publisher: American Chemical Society (ACS)
Date: 13-12-2010
DOI: 10.1021/LA1036162
Abstract: We show for the first time that by controlling the growth kinetics of Morganella psychrotolerans, a silver-resistant psychrophilic bacterium, the shape anisotropy of silver nanoparticles can be achieved. This is particularly important considering that there has been no report that demonstrates a control over shape of Ag nanoparticles by controlling the growth kinetics of bacteria during biological synthesis. Additionally, we have for the first time performed electrochemistry experiments on bacterial cells after exposing them to Ag(+) ions, which provide significant new insights about mechanistic aspects of Ag reduction by bacteria. The possibility to achieve nanoparticle shape control by using a "green" biosynthesis approach is expected to open up new exciting avenues for eco-friendly, large-scale, and economically viable shape-controlled synthesis of nanomaterials.
Hybrid CuTCNQ/AgTCNQ Metal‐Organic Charge Transfer Complexes via Galvanic Replacement vs Corrosion‐Recrystallization
Publisher: Wiley
Date: 06-10-2014
Broadband light active MTCNQ-based metal–organic semiconducting hybrids for enhanced redox catalysis
Publisher: Elsevier BV
Date: 12-2018
Copper Tetracyanoquinodimethane (CuTCNQ): A Metal-Organic Semiconductor for Room-Temperature Visible to Long-Wave Infrared Photodetection
Publisher: American Chemical Society (ACS)
Date: 09-08-2021
Rapid, accurate, and comparative differentiation of clinically and industrially relevant microorganisms via multiple vibrational spectroscopic fingerprinting
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6AN00883F
Abstract: Comparison of the applicability and accuracy of FT-IR, Raman and SERS, as physicochemical whole organism fingerprinting approaches, for differentiation of a range of microbial s les.
Synergetic Peroxidase-Mimic Catalytic Activity of Noble-Metal-Decorated Lithium Niobate Nanozymes for Potential Biological Applications
Publisher: American Chemical Society (ACS)
Date: 07-07-2023
Diverse dynamics features of novel protein kinase C (PKC) isozymes determine the selectivity of a fluorinated balanol analogue for PKCϵ
Publisher: Springer Science and Business Media LLC
Date: 02-2019
Degradation of black phosphorus is contingent on UV–blue light exposure
Publisher: Springer Science and Business Media LLC
Date: 29-06-2017
DOI: 10.1038/S41699-017-0023-5
Abstract: Layered black phosphorous has recently emerged as a promising candidate for next generation nanoelectronic devices. However, the rapid ambient degradation of mechanically exfoliated black phosphorous poses challenges in its practical implementation in scalable devices. As photo-oxidation has been identified as the main cause of degradation, to-date, the strategies employed to protect black phosphorous have relied upon preventing its exposure to atmospheric oxygen. These strategies inhibit access to the material limiting its use. An understanding of the effect of in idual wavelengths of the light spectrum can lead to alternatives that do not require the complete isolation of black phosphorous from ambient environment. Here, we determine the influence of discrete wavelengths ranging from ultraviolet to infrared on the degradation of black phosphorous. It is shown that the ultraviolet component of the spectrum is primarily responsible for the deterioration of black phosphorous in ambient conditions. Based on these results, new insights into the degradation mechanism have been generated which will enable the handling and operating of black phosphorous in standard fabrication laboratory environments.
Grandparents fostering orphans: influences of protective factors on their health and well-being.
Publisher: Informa UK Limited
Date: 10-07-2014
DOI: 10.1080/07399332.2014.916294
Abstract: In this study the authors explore the impact of protective factors on the health and well-being of grandmothers who are primary caregivers. Although researchers in Africa have studied grandparents who assume primary caregiving responsibilities, it is rare that they do so from a strength perspective, hence the need to examine the utility of personal, social, and environmental assets on caregiving. Grandmothers are the primary caregivers of orphaned children due to HIV and AIDS deaths thus it becomes pertinent to establish how they are coping without the provision of social security. The results of this study will be beneficial to all stakeholders interested in the welfare of elders with similar responsibilities. Knowledge about the health and well-being of grandmothers who are caregivers will assist public service and private sectors to formulate viable policies concerning elderly carers who foster orphans, particularly in countries with high HIV prevalence.
Probing the effect of charge transfer enhancement in off resonance mode SERS via conjugation of the probe dye between silver nanoparticles and metal substrates
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CP51646F
Abstract: The charge transfer-mediated surface enhanced Raman scattering (SERS) of crystal violet (CV) molecules that were chemically conjugated between partially polarized silver nanoparticles and optically smooth gold and silver substrates has been studied under off-resonant conditions. Tyrosine molecules were used as a reducing agent to convert silver ions into silver nanoparticles where oxidised tyrosine caps the silver nanoparticle surface with its semiquinone group. This binding through the quinone group facilitates charge transfer and results in partially oxidised silver. This establishes a chemical link between the silver nanoparticles and the CV molecules, where the positively charged central carbon of CV molecules can bind to the terminal carboxylate anion of the oxidised tyrosine molecules. After drop casting Ag nanoparticles bound with CV molecules it was found that the free terminal amine groups tend to bind with the underlying substrates. Significantly, only those CV molecules that were chemically conjugated between the partially polarised silver nanoparticles and the underlying gold or silver substrates were found to show SERS under off-resonant conditions. The importance of partial charge transfer at the nanoparticle/capping agent interface and the resultant conjugation of CV molecules to off resonant SERS effects was confirmed by using gold nanoparticles prepared in a similar manner. In this case the capping agent binds to the nanoparticle through the amine group which does not facilitate charge transfer from the gold nanoparticle and under these conditions SERS enhancement in the sandwich configuration was not observed.
Inducing tunable switching behavior in a single memristor
Publisher: Elsevier BV
Date: 06-2018
Exploration of charge states of balanol analogues acting as ATP-competitive inhibitors in kinases
Publisher: Springer Science and Business Media LLC
Date: 12-2017
Polycyclic Aromatic Hydrocarbons (PAHs) in inland aquatic ecosystems: Perils and remedies through biosensors and bioremediation
Publisher: Elsevier BV
Date: 10-2018
DOI: 10.1016/J.ENVPOL.2018.05.016
Abstract: Polycyclic Aromatic Hydrocarbons (PAHs) are among the most ubiquitous environmental pollutants of high global concern. PAHs belong to a erse family of hydrocarbons with over one hundred compounds known, each containing at least two aromatic rings in their structure. Due to hydrophobic nature, PAHs tend to accumulate in the aquatic sediments, leading to bioaccumulation and elevated concentrations over time. In addition to their well-manifested mutagenic and carcinogenic effects in humans, they pose severe detrimental effects to aquatic life. The high eco-toxicity of PAHs has attracted a number of reviews, each dealing specifically with in idual aspects of this global pollutant. However, efficient management of PAHs warrants a holistic approach that combines a thorough understanding of their physico-chemical properties, modes of environmental distribution and bioaccumulation, efficient detection, and bioremediation strategies. Currently, there is a lack of a comprehensive study that amalgamates all these aspects together. The current review, for the first time, overcomes this constraint, through providing a high level comprehensive understanding of the complexities faced during PAH management, while also recommending future directions through potentially viable solutions. Importantly, effective management of PAHs strongly relies upon reliable detection tools, which are currently non-existent, or at the very best inefficient, and therefore have a strong prospect of future development. Notably, the currently available biosensor technologies for PAH monitoring have not so far been compiled together, and therefore a significant focus of this article is on biosensor technologies that are critical for timely detection and efficient management of PAHs. This review is focussed on inland aquatic ecosystems with an emphasis on fish bio ersity, as fish remains a major source of food and livelihood for a large proportion of the global population. This thought provoking study is likely to instigate new collaborative approaches for protecting aquatic bio ersity from PAHs-induced eco-toxicity.
Solution-processable do-it-yourself switching devices (DIY devices) based on CuTCNQ metal-organic semiconductors
Publisher: Elsevier BV
Date: 03-2018
Visible-Light-Triggered Reactive-Oxygen-Species-Mediated Antibacterial Activity of Peroxidase-Mimic CuO Nanorods
Publisher: American Chemical Society (ACS)
Date: 06-03-2018
Transparent amorphous strontium titanate resistive memories with transient photo-response
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR04372D
Abstract: Highly transparent SrTiO 3 resistive memories with transient response to optical excitations are demonstrated and the evolution of oxygen vacancies with the location of a conductive filament is optically mapped.
Microstructure and dynamics of vacancy-induced nanofilamentary switching network in donor doped SrTiO3-x memristors
Publisher: IOP Publishing
Date: 18-11-2016
DOI: 10.1088/0957-4484/27/50/505210
Abstract: Donor doping of perovskite oxides has emerged as an attractive technique to create high performance and low energy non-volatile analog memories. Here, we examine the origins of improved switching performance and stable multi-state resistive switching in Nb-doped oxygen-deficient amorphous SrTiO
Robust Nanostructured Silver and Copper Fabrics with Localized Surface Plasmon Resonance Property for Effective Visible Light Induced Reductive Catalysis
Publisher: Wiley
Date: 07-01-2016
Photomodulated Spatially Confined Chemical Reactivity in a Single Silver Nanoprism
Publisher: American Chemical Society (ACS)
Date: 13-08-2020
Cancer Cell Discrimination Using Host–Guest “Doubled” Arrays
Publisher: American Chemical Society (ACS)
Date: 06-2017
DOI: 10.1021/JACS.7B03657
Data related to the nanoscale structural and compositional evolution in resistance change memories
Publisher: Elsevier BV
Date: 12-2018
Enhanced gas permeation through graphene nanocomposites
Publisher: American Chemical Society (ACS)
Date: 09-06-2015
Synthesis and Properties of Photoswitchable Carbohydrate Fluorosurfactants
Publisher: CSIRO Publishing
Date: 2015
DOI: 10.1071/CH15434
Abstract: We describe the parallel synthesis, photocontrollable surface tension, and antibacterial performance of a new class of carbohydrate fluorosurfactant. Novel fluorosurfactants comprised a mono- or disaccharide head group linked to an azobenzene unit that was variably substituted with a trifluoromethyl group. Fluorosurfactants were rapidly assembled using the venerable CuI-catalysed azide–alkyne cycloaddition reaction and exhibited light-addressable surface activity, excellent water solubility, and selective antibacterial activity against Gram-positive Staphylococcus aureus. Notably, the physicochemical and biological activity of these novel materials was heavily dependent on the nature of the head group and the position of the trifluoromethyl substituent on the azobenzene ring. The UV-adapted cis-isomer of fluorosurfactants displayed good thermal stability at ambient temperature, with little reversion to the stable trans isomer after 16 h. These novel, light-responsive materials should find broad interest in a range of biomedical and technological fields, including drug and gene delivery, self-cleaning oleophobic surfaces, and antibacterial coatings for medical devices.
One-pot synthesis of maghemite nanocrystals across aqueous and organic solvents for magnetic hyperthermia
Publisher: Elsevier BV
Date: 09-2018
Defining the role of humidity in the ambient degradation of few-layer black phosphorus
Publisher: IOP Publishing
Date: 30-11-2017
Fungus-mediated Biological Approaches Towards 'Green' Synthesis of Oxide Nanomaterials
Publisher: CSIRO Publishing
Date: 2011
DOI: 10.1071/CH10343
Abstract: A promising avenue of research in materials science is to follow the strategies used by nature to fabricate ornate hierarchical materials. For many ages, organisms have been engaged in on-the-job testing to craft structural and functional materials and have evolved extensively to possibly create the best-known materials. Some of the strategies used by nature may well have practical implications in the world of nanomaterials. Therefore, the efforts to exploit nature’s ingenious work in designing strategies for nanomaterials synthesis has led to biological routes for materials synthesis. This review outlines the biological synthesis of a range of oxide nanomaterials that has hitherto been achieved using fungal biosynthesis routes. A critical overview of the current status and future scope of this field that could potentially lead to the microorganism-mediated commercial, large-scale, environmentally benign, and economically-viable ‘green’ syntheses of oxide nanomaterials is also discussed.
Aptamer-controlled reversible inhibition of gold nanozyme activity for pesticide sensing
Publisher: American Chemical Society (ACS)
Date: 28-10-2014
DOI: 10.1021/AC5028726
Abstract: This study addresses the need for rapid pesticide (acetamiprid) detection by reporting a new colorimetric biosensing assay. Our approach combines the inherent peroxidase-like nanozyme activity of gold nanoparticles (GNPs) with high affinity and specificity of an acetamiprid-specific S-18 aptamer to detect this neurotoxic pesticide in a highly rapid, specific, and sensitive manner. It is shown that the nanozyme activity of GNPs can be inhibited by its surface passivation with target-specific aptamer molecules. Similar to an enzymatic competitive inhibition process, in the presence of a cognate target, these aptamer molecules leave the GNP surface in a target concentration-dependent manner, reactivating GNP nanozyme activity. This reversible inhibition of the GNP nanozyme activity can either be directly visualized in the form of color change of the peroxidase reaction product or can be quantified using UV-visible absorbance spectroscopy. This approach allowed detection of 0.1 ppm acetamiprid within an assay time of 10 min. This reversible nanozyme activation/inhibition strategy may in principle be universally applicable for the detection of a range of environmental or biomedical molecules of interest.
LSPR‐Induced Catalytic Enhancement Using Bimetallic Copper Fabrics Prepared by Galvanic Replacement Reactions
Publisher: Wiley
Date: 05-06-2019
Self-Assembled Enzyme Capsules in Ionic Liquid [BMIM][BF4] as Templating Nanoreactors for Hollow Silica Nanocontainers
Publisher: American Chemical Society (ACS)
Date: 22-09-2010
DOI: 10.1021/LA101965J
Abstract: Most of the self-assembly studies have hitherto explored the aqueous media as fluid phase for self-assembly of hiphilic biomacromolecules, wherein architectural modification of biomolecules is generally a prerequisite for self-assembly of modified biomolecules. We demonstrate for the first time that ionic liquids can act as nonaqueous designer solvents to self-assemble hiphilic biomacromolecules without requiring their prior modification. To this end, we show that enzyme (phytase) molecules self-assembled in the presence of an appropriate ionic liquid, resulting in the formation of enzyme capsules. Phytase capsules synthesized using this approach were further used as templating nanoreactors for the synthesis of enzyme-containing hollow silica nanocontainers. In situ immobilized phytase enzyme in the silica nanocontainers, when subjected to enzyme-reusability application, establishes them as excellent reusable biocatalysts.
Ambient Protection of Few-Layer Black Phosphorus via Sequestration of Reactive Oxygen Species
Publisher: Wiley
Date: 12-05-2017
Abstract: Few-layer black phosphorous (BP) has emerged as a promising candidate for next-generation nanophotonic and nanoelectronic devices. However, rapid ambient degradation of mechanically exfoliated BP poses challenges in its practical deployment in scalable devices. To date, the strategies employed to protect BP have relied upon preventing its exposure to atmospheric conditions. Here, an approach that allows this sensitive material to remain stable without requiring its isolation from the ambient environment is reported. The method draws inspiration from the unique ability of biological systems to avoid photo-oxidative damage caused by reactive oxygen species. Since BP undergoes similar photo-oxidative degradation, imidazolium-based ionic liquids are employed as quenchers of these damaging species on the BP surface. This chemical sequestration strategy allows BP to remain stable for over 13 weeks, while retaining its key electronic characteristics. This study opens opportunities to practically implement BP and other environmentally sensitive 2D materials for electronic applications.
Galvanic Replacement of Semiconducting CuTCNQF4 with Ag+ Ions to Enhance Electron Transfer Reaction
Publisher: Wiley
Date: 31-10-2017
Inorganic materials using ‘unusual’ microorganisms
Publisher: Elsevier BV
Date: 11-2012
DOI: 10.1016/J.CIS.2012.06.013
Abstract: A promising avenue of research in materials science is to follow the strategies used by Mother Nature to fabricate ornate hierarchical structures as exemplified by organisms such as diatoms, sponges and magnetotactic bacteria. Some of the strategies used in the biological world to create functional inorganic materials may well have practical implications in the world of nanomaterials. Therefore, the strive towards exploring nature's ingenious work for designing strategies to create inorganic nanomaterials in our laboratories has led to development of biological and biomimetic synthesis routes over the past decade or so. A large proportion of these relentless efforts have explored the use of those microorganisms, which are typically not known to encounter these inorganic materials in their natural environment. Therefore, one can consider these microorganisms as 'unusual' for the purpose for which they have been utilized - it is in this context that this review has been penned down. In this extensive review, we discuss the use of these 'unusual' microorganisms for deliberate biosynthesis of various nanomaterials including biominerals, metals, sulfides and oxides nanoparticles. In addition to biosynthesis approach, we have also discussed a bioleaching approach, which can provide a noble platform for room-temperature synthesis of inorganic nanomaterials using naturally available raw materials. Moreover, the unique properties and functionalities displayed by these biogenic inorganic materials have been discussed, wherever such properties have been investigated previously. Finally, towards the end of this review, we have made efforts to summarize the common outcomes of the biosynthesis process and draw conclusions, which provide a perspective on the current status of the biosynthesis research field and highlights areas where future research in this field should be directed to realize the full potential of biological routes towards nanomaterials synthesis. Furthermore, the review clearly demonstrates that the biological route to inorganic materials synthesis is not merely an addition to the existing list of synthesis routes biological routes using 'unusual' microorganisms might in fact provide an edge over other nanomaterials synthesis routes in terms of their eco-friendliness, low energy intensiveness, and economically-viable synthesis. This review has significant importance for colloids and interface science since it underpins the synthesis of colloidal materials using 'unusual' microorganism, wherein the role of biological interfaces for controlled synthesis of technologically important nanomaterials is clearly evident.
A unique in vivo approach for investigating antimicrobial materials utilizing fistulated animals
Publisher: Springer Science and Business Media LLC
Date: 22-06-2015
DOI: 10.1038/SREP11515
Abstract: Unique in vivo tests were conducted through the use of a fistulated ruminant, providing an ideal environment with a erse and vibrant microbial community. Utilizing such a procedure can be especially invaluable for investigating the performance of antimicrobial materials related to human and animal related infections. In this pilot study, it is shown that the rumen of a fistulated animal provides an excellent live laboratory for assessing the properties of antimicrobial materials. We investigate microbial colonization onto model nanocomposites based on silver (Ag) nanoparticles at different concentrations into polydimethylsiloxane (PDMS). With implantable devices posing a major risk for hospital-acquired infections, the present study provides a viable solution to understand microbial colonization with the potential to reduce the incidence of infection through the introduction of Ag nanoparticles at the optimum concentrations. In vitro measurements were also conducted to show the validity of the approach. An optimal loading of 0.25 wt % Ag is found to show the greatest antimicrobial activity and observed through the in vivo tests to reduce the microbial ersity colonizing the surface.
Ultrasensitive Colorimetric Detection of Murine Norovirus Using NanoZyme Aptasensor
Publisher: American Chemical Society (ACS)
Date: 14-01-2019
DOI: 10.1021/ACS.ANALCHEM.8B03300
Abstract: Human norovirus (NoV) remains the most common cause of viral gastroenteritis and the leading cause of viral foodborne outbreaks globally. NoV is highly pathogenic with an estimated median viral infective dose (ID
3-D nanorod arrays of metal-organic KTCNQ semiconductor on textiles for flexible organic electronics
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3RA43291B
Reactive Oxygen Species Sequestration Induced Synthesis of β-PbO and Its Polymorphic Transformation to α-PbO at Atomically Thin Regimes
Publisher: American Chemical Society (ACS)
Date: 27-06-2022
Abstract: The emergence of attractive properties in materials at atomically thin regimes has seen an ongoing interest in two-dimensional (2D) materials. An aspect that has lacked focused attention is the effect of 2D material thickness on its crystal structure. As several layered materials naturally exist in mixed metastable phases, it raises an important question of whether a specific polymorph of these mixed-phase materials will be favored at atomically thin limits. This work attempts to address this issue by employing lead monoxide as a model 2D polymorphic system. We propose a reactive oxygen species (ROS) sequestration-mediated liquid-phase exfoliation (LPE) strategy for the facile synthesis of ultrathin PbO. This is followed by a suite of microscopic and spectroscopic analyses of the PbO nanosheets that reveals the polymorphic transformation of orthorhombic (β) PbO to its tetragonal (α) analogue with reduction in nanosheet thickness. The transformation process reveals an interesting crystal structure of ultrathin 2D PbO where [001]-oriented domains of α-PbO coexist alongside [100]-oriented regions of β-PbO. Density functional theory (DFT) calculations support our experimental data by revealing a higher thermodynamic stability of the tetragonal phase in PbO monolayers. These findings are likely to instigate interest in carefully evaluating the crystal structures of ultrathin 2D materials while promoting research in understanding the phase transformation across a range of 2D crystals.
Dynamic interactions between peroxidase-mimic silver NanoZymes and chlorpyrifos-specific aptamers enable highly-specific pesticide sensing in river water
Publisher: Elsevier BV
Date: 11-2019
DOI: 10.1016/J.ACA.2019.07.066
Abstract: With growing environmental and health concerns over persistent organic compounds such as organophosphates, regulatory bodies have imposed strict regulations for their use and monitoring in water bodies. Although conventional analytical tools exist for the detection of organophosphorus pesticides, new strategies need to be developed to fulfil the ASSURED (affordable, sensitive, specific, user-friendly, rapid, equipment-free and deliverable to end users) criteria of the World Health Organisation. One such strategy is to employ the ability of certain nanoparticles to mimic the enzymatic activity of natural enzymes to develop optical sensors. We show that the intrinsic peroxidase-mimic NanoZyme activity of tyrosine-capped silver nanoparticles (Ag-NanoZyme) can be exploited for highly specific and rapid detection of chlorpyrifos, an organophosphorus pesticide. The underlying working principle of the proposed aptasensor is based on the dynamic non-covalent interaction of the chlorpyrifos specific aptamer (Chl) with the NanoZyme (sensor probe) vs. the pesticide target (analyte). The incorporation of the Chl aptamer ensures high specificity leading to a colorimetric response specifically in the presence of chlorpyrifos, while the sensor remains unresponsive to other pesticides from organophosphate and non-organophosphate groups. The robustness of the sensor to work directly in environmental s les was established by evaluating its ability to detect chlorpyrifos in river water s les. The excellent recovery rates demonstrate the sensor robustness, while the simplicity, and rapid sensor response (2 min) to detect the presence of chlorpyrifos highlights the capabilities of the proposed colorimetric sensing system.
Bimetallic nanozyme mediated urine glucose monitoring through discriminant analysis of colorimetric signal
Publisher: Elsevier BV
Date: 09-2022
DOI: 10.1016/J.BIOS.2022.114386
Abstract: The ability to detect glucose concentrations in human urine offers a non-invasive approach to monitor changes in blood glucose, kidney health and vascular complications associated with diabetes. We show the potential of employing catalytically active nanoparticles directly grown on textiles to produce a dose-dependent colorimetric sensor for glucose. We use a galvanic replacement (GR) reaction for the synthesis of bimetallic nanoparticles. Here, Cu nanoparticles act as a sacrificial template that undergoes a spontaneous electroless GR reaction when exposed to metal ions of gold, silver, platinum, and palladium to form bimetallic Cu-M nanoparticles (M = Au, Ag, Pt, or Pd). The evaluation of their intrinsic peroxidase-mimicking catalytic activity ("nanozyme") in comparison to that of the Cu nanozyme revealed that the bimetallic systems show a higher catalytic rate with the Cu-Pt nanozyme showing the highest catalytic efficiency. This property of the Cu-Pt nanozyme was then utilized to detect glucose in human urine using the glucose oxidase enzyme as a molecular recognition element. A key outcome of our study is the ability to detect urine glucose without requiring s le dilution which is an advantage over the gold standard GOx-POx method and significantly more reliable performance over commercial urine glucose dipsticks. The difference in the intensity of the colorimetric response between different glucose concentrations further allowed this sensor system to be combined with digital imaging tools for multivariate analysis.
Nanostructured charge transfer complex of CuTCNQF4 for efficient photo-removal of hexavalent chromium
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA02636B
Abstract: The fabrication of a nanostructured CuTCNQF 4 organic charge transfer complex on copper foil by employing a facile redox reaction in acetonitrile and its ability to promote catalytic reduction of toxic Cr 6+ to its non-toxic Cr 3+ counterpart.
Role of Water in the Dynamic Crystallization of CuTCNQ for Enhanced Redox Catalysis (TCNQ = Tetracyanoquinodimethane)
Publisher: Wiley
Date: 05-07-2017
Rapid colorimetric detection of mercury using biosynthesized gold nanoparticles
Publisher: Elsevier BV
Date: 11-2017
Structure-based drug design workflow
Publisher: Elsevier
Date: 2018
Related Organisations
Related Funding Activities
Discovery Projects - Grant ID: DP170103477
Start Date: 02-2017
End Date: 09-2021
Amount: $304,000.00
Funder: Australian Research Council
View Funded ActivityDiscovery Projects - Grant ID: DP230101650
Start Date: 2023
End Date: 12-2025
Amount: $267,720.00
Funder: Australian Research Council
View Funded Activity