ORCID Profile
0000-0003-0088-7361
Current Organisations
Deakin University
,
Flinders University
,
Massey University
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Publisher: The Chemical Society of Japan
Date: 05-09-2007
DOI: 10.1246/CL.2007.1172
Publisher: Elsevier BV
Date: 05-2008
Publisher: MDPI AG
Date: 27-06-2019
DOI: 10.3390/APP9132604
Abstract: Cantilever devices have found applications in numerous scientific fields and instruments, including the atomic force microscope (AFM), and as sensors to detect a wide range of chemical and biological species. The mechanical properties, in particular, the spring constant of these devices is crucial when quantifying adhesive forces, material properties of surfaces, and in determining deposited mass for sensing applications. A key component in the spring constant of a cantilever is the plan-view shape. In recent years, the trapezoidal plan-view shape has become available since it offers certain advantages to fast-scanning AFM and can improve sensor performance in fluid environments. Euler beam equations relating cantilever stiffness to the cantilever dimensions and Young’s modulus have been proven useful and are used extensively to model cantilever mechanical behaviour and calibrate the spring constant. In this work, we derive a simple correction factor to the Euler beam equation for a beam-shaped cantilever that is applicable to any cantilever with a trapezoidal plan-view shape. This correction factor is based upon previous analytical work and simplifies the application of the previous researchers formula. A correction factor to the spring constant of an AFM cantilever is also required to calculate the torque produced by the tip when it contacts the s le surface, which is also dependent on the plan-view shape. In this work, we also derive a simple expression for the torque for triangular plan-view shaped cantilevers and show that for the current generation of trapezoidal plan-view shaped AFM cantilevers, this will be a good approximation. We shall apply both these correction factors to determine Young’s modulus for a range of trapezoidal-shaped AFM cantilevers, which are specially designed for fast-scanning. These types of AFM probes are much smaller in size when compared to standard AFM probes. In the process of analysing the mechanical properties of these cantilevers, important insights are also gained into their spring constant calibration and dimensional factors that contribute to the variability in their spring constant.
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 12-2007
Publisher: SPIE
Date: 27-12-2006
DOI: 10.1117/12.695611
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B716284G
Publisher: Elsevier BV
Date: 12-2011
Publisher: Springer Science and Business Media LLC
Date: 1999
Publisher: IEEE
Date: 07-2013
Publisher: Elsevier BV
Date: 05-2007
DOI: 10.1016/J.ACA.2007.03.030
Abstract: Autocorrelation infrared (ACIR) analysis is based upon the application of the autocorrelation function corr(alpha,omega') = integral(-infinity)(infinity) alpha(omega + omega') alpha(omega) d omega to standard Fourier transform infrared (FTIR) transmission spectra. We present a rigorous examination of the effect of experimental parameters such as dilution ratio, spectral resolution, grinding time and pressing conditions upon the ACIR analysis of haematite. Results were found to vary by less than 4.5% irrespective of s le preparation, instrumental and data collection parameters. For a series of perovskite s les, the relationship between the measured effective linewidth and material composition appears to be reproducible, even though the absolute magnitudes of delta corr values do not. Our results further indicate that the ACIR technique is indeed valid for comparative analysis of synthetic s le sequences that vary slightly in composition or structural state, provided that primary spectra are all recorded by the same instrument.
Publisher: IEEE
Date: 02-2008
Publisher: Wiley
Date: 2000
DOI: 10.1002/1096-9918(200008)30:1<21::AID-SIA716>3.0.CO;2-1
Publisher: Informa UK Limited
Date: 03-2013
Publisher: Elsevier BV
Date: 2010
Publisher: Elsevier BV
Date: 06-2019
Publisher: AIP Publishing
Date: 08-2011
DOI: 10.1063/1.3615945
Abstract: In this work a simple and up-scalable technique for creating arrays of high purity carbon nanotubes via plasma enhanced chemical vapor deposition is demonstrated. Inductively coupled plasma enhanced chemical vapor deposition was used with methane and argon mixtures to grow arrays in a repeatable and controllable way. Changing the growth conditions such as temperature and growth time led to a transition between single and multi-walled carbon nanotubes and was investigated. This transition from single to multi-walled carbon nanotubes is attributed to a decrease in catalytic activity with time due to amorphous carbon deposition combined with a higher susceptibility of single-walled nanotubes to plasma etching. Patterning of these arrays was achieved by physical masking during the iron catalyst deposition process. The low growth pressure of 100 mTorr and lack of reducing gas such as ammonia or hydrogen or alumina supporting layer further show this to be a simple yet versatile procedure. These arrays were then characterized using scanning electron microscopy, Raman spectroscopy and x-ray photoelectron spectroscopy. It was also observed that at high temperature (550 °C) single-walled nanotube growth was preferential while lower temperatures (450 °C) produced mainly multi-walled arrays.
Publisher: Elsevier BV
Date: 06-2014
Publisher: IOP Publishing
Date: 25-06-2012
DOI: 10.1088/0957-4484/23/28/285704
Abstract: A calibration method is presented for determining the spring constant of atomic force microscope (AFM) cantilevers, which is a modification of the established Cleveland added mass technique. A focused ion beam (FIB) is used to remove a well-defined volume from a cantilever with known density, substantially reducing the uncertainty usually present in the added mass method. The technique can be applied to any type of AFM cantilever but for the lowest uncertainty it is best applied to silicon cantilevers with spring constants above 0.7 N m(-1), where uncertainty is demonstrated to be typically between 7 and 10%. Despite the removal of mass from the cantilever, the calibration method presented does not impair the probes' ability to acquire data. The technique has been extensively tested in order to verify the underlying assumptions in the method. This method was compared to a number of other calibration methods and practical improvements to some of these techniques were developed, as well as important insights into the behavior of FIB modified cantilevers. These results will prove useful to research groups concerned with the application of microcantilevers to nanoscience, in particular for cases where maintaining pristine AFM tip condition is critical.
Publisher: American Chemical Society (ACS)
Date: 12-07-2010
DOI: 10.1021/JP104113D
Abstract: The sonication-centrifugation technique is commonly used for dispersing single-walled carbon nanotubes (SWCNTs) in aqueous surfactant solutions. However, the methodologies and materials used for this purpose are widely varied, and few dispersive agents have been studied systematically. This work describes a systematic study into the ability of some well-known (and some less common) surfactants and polymers to disperse SWCNTs fabricated by two different techniques. UV-vis-NIR absorbance spectra of their supernatant solutions showed that the smaller ionic surfactants were generally more effective dispersants, with larger polymer and surfactant molecules exhibiting a reduced performance for ensembles of carbon nanotubes of smaller average diameter. Optimal surfactant concentrations were established for dispersions of carbon nanotubes produced by the electric arc method in aqueous solutions of sodium dodecylbenzene sulfonate, sodium deoxycholate, Triton X-405, Brij S-100, Pluronic F-127, and polyvinylpyrrolidone. This optimum value was determined as the point at which the relative concentration of nanotubes dispersed is maximized, before flocculation-inducing attractive depletion interactions begin to dominate. The aggregation state of carbon nanotubes dispersed in sodium dodecylbenzene sulfonate was probed by AFM at different stages of rebundling, showing the length dependence of these effects.
Publisher: CMV Verlag
Date: 03-2022
Publisher: MDPI AG
Date: 12-02-2019
Abstract: The growth of silane films on plasma oxidized highly oriented pyrolytic graphite (HOPG) surfaces has been studied using wet chemical deposition of propyltrimethoxysilane (PTMS) and propyldimethylmethoxysilane (PDMMS). Scanning Auger microscopy (SAM) and X-ray photoelectron spectroscopy (XPS) were used to investigate the chemical composition and morphology of the silane films. The effects of several deposition parameters were examined, including the necessity of oxidation of the HOPG surface, addition of water with the silane, and rinsing before curing. The optimal conditions needed to create a complete uniform film differ for the two silanes due to differences in their structures. Both silanes require an oxidized HOPG surface for a film to grow, the addition of water with PTMS results in a thicker film, while the addition of water with PDMMS decreases the film growth. Rinsing of both s les before curing removes physisorbed species, leaving only the covalently bonded film on the surface.
Publisher: Wiley
Date: 11-1997
DOI: 10.1002/(SICI)1096-9918(199711)25:12<931::AID-SIA325>3.0.CO;2-F
Publisher: Elsevier BV
Date: 11-1999
Publisher: Springer Science and Business Media LLC
Date: 15-05-2013
Publisher: Elsevier BV
Date: 15-07-2010
DOI: 10.1016/J.TALANTA.2010.05.044
Abstract: There is limited information regarding the nature of plant and animal residues used as adhesives, fixatives and pigments found on Australian Aboriginal artefacts. This paper reports the use of FTIR in combination with the chemometric tools principal component analysis (PCA) and hierarchical clustering (HC) for the analysis and identification of Australian plant and animal fixatives on Australian stone artefacts. Ten different plant and animal residues were able to be discriminated from each other at a species level by combining FTIR spectroscopy with the chemometric data analysis methods, principal component analysis (PCA) and hierarchical clustering (HC). Application of this method to residues from three broken stone knives from the collections of the South Australian Museum indicated that two of the handles of knives were likely to have contained beeswax as the fixative whilst Spinifex resin was the probable binder on the third.
Publisher: MDPI AG
Date: 09-10-2018
DOI: 10.3390/NANO8100807
Abstract: In this work PeakForce tapping (PFT) imaging was demonstrated with carbon nanotube atomic force microscopy (CNT-AFM) probes this imaging mode shows great promise for providing simple, stable imaging with CNT-AFM probes, which can be difficult to apply. The PFT mode is used with CNT-AFM probes to demonstrate high resolution imaging on s les with features in the nanometre range, including a Nioprobe calibration s le and gold nanoparticles on silicon, in order to demonstrate the modes imaging effectiveness, and to also aid in determining the diameter of very thin CNT-AFM probes. In addition to stable operation, the PFT mode is shown to eliminate “ringing” artefacts that often affect CNT-AFM probes in tapping mode near steep vertical step edges. This will allow for the characterization of high aspect ratio structures using CNT-AFM probes, an exercise which has previously been challenging with the standard tapping mode.
Publisher: Elsevier BV
Date: 05-2019
Publisher: Ishik University
Date: 2023
Publisher: Wiley
Date: 08-11-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2009
Publisher: Elsevier BV
Date: 06-2012
Publisher: IOP Publishing
Date: 13-05-2013
DOI: 10.1088/0957-4484/24/23/235705
Abstract: Carbon nanotubes are considered to be an ideal imaging tip for atomic force microscopy (AFM) applications, and a number of methods for fabricating these types of probe have been developed in recent years. This work reports the attachment of carbon nanotubes to AFM probes using a micromanipulator within a scanning electron microscope. Electron beam induced deposition and etching are used to enhance the quality and attachment of the carbon nanotube tip and improve the fabrication rate of the CNT AFM probes compared to existing techniques. The attachment process is also improved by using a mat of SWCNTs (buckypaper) as a CNT source, which simultaneously improves the ease of fabrication and rate of nanotube probe production. The aim of these improvements is to simplify and improve the attachment process such that these probes can be better and more widely used in applications that benefit from their unique properties. This improved process is then used to attach CNTs to the new generation of low-mass, high-frequency probes, which are designed for rapid AFM imaging. The ability of these probes to operate with CNT tips is demonstrated, and their wear-resistance properties were found to be significantly enhanced compared to unmodified probes. These wear-resistant probes imaging at high scan rates are proposed to be effective tools for increasing throughput in metrological analysis, particularly for imaging high-modulus surfaces with high roughness and high-aspect-ratio features.
Publisher: Elsevier BV
Date: 12-2022
Publisher: IOP Publishing
Date: 30-07-2014
DOI: 10.1088/0957-4484/25/33/335705
Abstract: As a recent technological development, high-speed atomic force microscopy (AFM) has provided unprecedented insights into dynamic processes on the nanoscale, and is capable of measuring material property variation over short timescales. Miniaturized cantilevers developed specifically for high-speed AFM differ greatly from standard cantilevers both in size and dynamic properties, and calibration of the cantilever spring constant is critical for accurate, quantitative measurement. This work investigates specifically, the calibration of these new-generation cantilevers for the first time. Existing techniques are tested and the challenges encountered are reported and the most effective approaches for calibrating fast-scanning cantilevers with high accuracy are identified, providing a resource for microscopists in this rapidly developing field. Not only do these cantilevers offer faster acquisition of images and force data but due to their high resonant frequencies (up to 2 MHz) they are also excellent mass sensors. Accurate measurement of deposited mass requires accurate calibration of the cantilever spring constant, therefore the results of this work will also be useful for mass-sensing applications.
Publisher: IEEE
Date: 02-2010
Publisher: Elsevier BV
Date: 07-2008
Publisher: Wiley
Date: 30-08-2017
Publisher: Elsevier BV
Date: 08-2013
DOI: 10.1016/J.ULTRAMIC.2013.03.009
Abstract: Considerable attention has been given to the calibration of AFM cantilever spring constants in the last 20 years. Techniques that do not require tip-s le contact are considered advantageous since the imaging tip is not at risk of being damaged. Far less attention has been directed toward measuring the cantilever deflection or sensitivity, despite the fact that the primary means of determining this factor relies on the AFM tip being pressed against a hard surface, such as silicon or sapphire which has the potential to significantly damage the tip. A recent method developed by Tourek et al. in 2010 involves deflecting the AFM cantilever a known distance from the imaging tip by pressing the cantilever against a sharpened tungsten wire. In this work a similar yet more precise method is described, whereby the deflection of the cantilever is achieved using an AFM probe with a spring constant much larger than the test cantilever, essentially a rigid cantilever. The exact position of loading on the test cantilever was determined by reverse AFM imaging small spatial markers that are milled into the test cantilever using a focussed ion beam. For V shaped cantilevers it is possible to reverse image the arm intersection in order to determine the exact loading point without necessarily requiring FIB milled spatial markers, albeit at the potential cost of additional uncertainty. The technique is applied to tip-less, beam shaped and V shaped cantilevers and compared to the hard surface contact technique with very good agreement (on average less than 5% difference). While the agreement with the hard surface contact technique was very good the error on the technique is dependent upon the assumptions inherent in the method, such as cantilever shape, loading point distance and ratio of test to rigid cantilever spring constants. The average error ranged between 2 to 5% for the majority of test cantilevers studied. The sensitivity derived with this technique can then be used to calibrate the cantilever spring constant using the thermal noise method, allowing complete force calibration to be accurately performed without tip-s le contact.
Publisher: MDPI
Date: 08-05-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM13957F
Publisher: IEEE
Date: 02-2010
Publisher: Wiley
Date: 25-09-2018
Publisher: MDPI AG
Date: 24-08-2023
DOI: 10.3390/SU151712806
Abstract: Additive manufacturing is an emerging process that is used to manufacture industrial parts layer by layer and can produce a wide range of geometries for various applications. AM parts are adopted for aerospace, automobiles, antennas, gyroscopes, and waveguides in electronics. However, there are several challenges existing in manufacturing Al components using the AM process, and their mechanical and microstructural properties are not yet fully validated. In the present study, a gas-atomised powder of a eutectic Al-12Si alloy was used as feedstock for the Laser Direct Energy Deposition (LDED) process. A SEM analysis of Al-12Si powder used for processing illustrated that particles possess appropriate morphology for LDED. A numerical control system was used to actuate the deposition head towards printing positions. The deposited s les revealed the presence of Al-rich and Al-Si eutectic regions. The porosity content in the s les was found to be around 2.6%. Surface profile roughness measurements and a microstructural analysis of the s les were also performed to assess the fabricated s le in terms of the roughness, porosity, and distribution of Al and Al/Si eutectic phases. The tensile properties of fabricated thin walls were better compared to casted Al alloys due to the uniform distribution of Si in each layer. Micro-hardness tests on the deposited s les showed a hardness of 95 HV, which is equivalent to casted and powder bed fusion melting s les. The gas atomised Al-12Si powders are highly reflective to a laser and also quick oxidation takes place, which causes defects, porosity, and the balling effect during fabrication. The results can be used as a base guide for the further fabrication of aerospace component design with high structural integrity.
Publisher: Wiley
Date: 2000
DOI: 10.1002/1096-9918(200008)30:1<25::AID-SIA717>3.0.CO;2-N
Publisher: Elsevier BV
Date: 11-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2007
DOI: 10.1039/B615096A
Abstract: A new approach for the attachment of vertically-aligned shortened carbon nanotube architectures to a silicon (100) substrate by chemical anchoring directly to the surface has been demonstrated for the first time. The ordered assembly of single-walled carbon nanotubes (SWCNTs) was accomplished by hydroxylating the silicon surface followed by a condensation reaction with carboxylic acid functionalised SWCNTs. This new nanostructure has been characterised by X-ray photoelectron, Raman and Fourier transform infrared (FTIR) spectroscopy as well as scanning electron and atomic force microscopy. The assembly behaviour of SWCNTs onto the silicon surface shows a fast initial step producing isolated functionalised carbon nanotubes or nanotube bundles anchored to the silicon surface followed by a slower step where the adsorbed nanotubes grow into larger aggregates via van der Waals interactions between adsorbed and solvated nanotubes. The electrochemical and optical properties of the SWCNTs directly attached to silicon have also been investigated. These new nanostructures are excellent electrochemical electrodes. They also fluoresce in the wavelength range 650-800 nm. The successful attachment of the SWCNTs directly to silicon provides a simple, new avenue for fabrication and development of silicon-based nanoelectronic, nano-optoelectronic and sensing devices. Compared to existing techniques, this new approach has several advantages including low operating temperature, low cost and the possibility of further modification.
Publisher: MDPI AG
Date: 04-03-2019
Abstract: The effect of physisorbed and chemisorbed species on the time-dependent self-assembly mechanism of organosilane films has been investigated on aluminium oxide using X-ray Photoelectron Spectroscopy. The role of physisorbed species was determined through their removal using a simple rinsing procedure while monitoring film substrate coverage. Removing physisorbed species from Propyldimethylmethoxysilane films, shown to follow a Langmuir-type adsorption profile, reduces the substrate coverage initially but quickly results in coverages equivalent to films that did not undergo a rinsing procedure. This indicates that all Propyldimethylmethoxysilane molecules are covalently bound to the substrate following 15 s of film growth. Removing physisorbed species from films, which have been shown to follow an oscillatory adsorption profile, Propyltrimethoxysilane and Propylmethyldimethoxysilane, reveal the persistence of these oscillations despite a reduction in silane substrate coverage. These results not only confirm the presence of two thermodynamically favourable phases in the condensation equilibrium reaction as physisorbed and chemisorbed species, but also indicate that the desorption of species during film growth involves both states of chemical binding.
Publisher: Elsevier BV
Date: 07-2021
Publisher: American Chemical Society (ACS)
Date: 19-09-2018
Publisher: Wiley
Date: 2001
DOI: 10.1002/SIA.1005
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B809609K
Publisher: Elsevier BV
Date: 06-2007
Publisher: University of Texas at Arlington Libraries
Date: 09-2020
Publisher: IEEE
Date: 02-2008
Publisher: MDPI AG
Date: 24-03-2018
DOI: 10.3390/MIN8040132
Publisher: Wiley
Date: 15-01-2013
Abstract: Carbon nanotube-silicon solar cells are a recently investigated photovoltaic architecture with demonstrated high efficiencies. Silicon solar-cell devices fabricated with a thin film of conductive polymer (polyaniline) have been reported, but these devices can suffer from poor performance due to the limited lateral current-carrying capacity of thin polymer films. Herein, hybrid solar-cell devices of a thin film of polyaniline deposited on silicon and covered by a single-walled carbon nanotube film are fabricated and characterized. These hybrid devices combine the conformal coverage given by the polymer and the excellent electrical properties of single-walled carbon nanotube films and significantly outperform either of their component counterparts. Treatment of the silicon base and carbon nanotubes with hydrofluoric acid and a strong oxidizer (thionyl chloride) leads to a significant improvement in performance.
Publisher: Springer Science and Business Media LLC
Date: 24-07-2019
Publisher: IEEE
Date: 2006
Publisher: American Chemical Society (ACS)
Date: 12-08-2022
Publisher: Elsevier BV
Date: 04-2004
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0CP02740E
Abstract: Single-walled carbon nanotube arrays attached to conductive transparent electrodes have previously shown promise for use in photovoltaic devices, whilst still retaining light transmission. Here, chemical modification of these thin (<200 nm) arrays with PAMAM-type dendrons has been undertaken to enhance the photoresponse of these devices. The effect of modification on the electrode was measured by differential pulse voltammetry to detect the dendrons, and the effect on the nanotubes was measured by Raman spectroscopy. Solar simulator illumination of the cells was performed to measure the effect of the nanotube modification on the cell power, and determine the optimal modification. Electrochemical impedance spectroscopy was also used to investigate the equivalent electronic circuit elements of the cells. The optimal dendron modification occurred with the second generation (G-2.0), which gave a 70% increase in power over the unmodified nanotube array.
Publisher: Springer Science and Business Media LLC
Date: 26-06-2011
Publisher: SPIE
Date: 27-12-2006
DOI: 10.1117/12.696223
Publisher: IEEE
Date: 02-2008
Publisher: Elsevier BV
Date: 10-2010
Publisher: IEEE
Date: 02-2010
Publisher: IEEE
Date: 2006
Publisher: IEEE
Date: 2006
Publisher: American Vacuum Society
Date: 07-2002
DOI: 10.1116/1.1493786
Abstract: Interfacial electronic structure is important for a fundamental understanding of the properties of field-effect transistor (FET) device structure systems. Previous studies using soft x-ray photoelectron spectroscopy (SXPS) have demonstrated well-defined interface states that appear at binding energies between the peaks due to the substrate Si and the oxide SiO2. Recently we have shown that significant interface changes with annealing for the SiO2/Si system commonly used for FET gate dielectrics illustrating the effectiveness of SXPS for the current study. The present article presents SXPS studies using synchrotron radiation of the electronic structure at the interface between Ta2O5–Al2O3 alloys and Si(111). This system is typical of FET alternative-gate-oxide films and has an electronic structure characteristic of high-k gate dielectrics. Thin films (& Å) of Ta2O5–Al2O3 alloys were carefully prepared using remote plasma enhanced chemical vapor deposition on Si(111). For this study, SXPS spectra were taken for the Si 2p, Al 2p, and Ta 4f core levels. The Si 2p SXPS data confirm that SiO2 is formed at the Si interface during deposition for all alloys (in agreement with previously published results) and that the Si interface is qualitatively similar to SiO2/Si s les. The binding energy of the Si4+ Si 2p3/2 core level varies significantly for our alloy s les and this is interpreted as a screening effect rather than being due to Ta or Al silicate formation. The Al 2p and Ta 4f SXPS core level peak positions reveal screening effects. For these data, line shape analysis also supports alloy homogeneity as independently determined by Auger electron spectroscopy and Fourier transform infrared spectroscopy.
Publisher: MDPI AG
Date: 25-10-2017
DOI: 10.3390/NANO7110346
Publisher: Institut Seni Indonesia Yogyakarta
Date: 27-06-2022
Abstract: A PhD in science demands rigour, repeatability, and accountability. Epistemological, methodological, and ontological expectations flood the policies, procedures, and practice. One mode of doctorate has existed beyond the typical parameters of science: the artefact and exegesis PhD. Most commonly positioned in the creative arts and creative writing, how could this mode of doctorate be deployed in the sciences? This article, written by three academics who shared this innovative supervisory space, reveals the strengths and challenges that emerge from this innovative form and content for research. Our goal is to open out transformative spaces for doctoral education through erse disciplines. Ilmuwan, Artefak, dan Eksegesis: Menantang Parameter PhDAbstrakGelar PhD dalam sains menuntut ketelitian, pengulangan, dan akuntabilitas. Harapan epistemologis, metodologis, dan ontologis membanjiri kebijakan, prosedur, dan praktik. Satu mode doktor telah ada di luar parameter khas sains: artefak dan eksegesis PhD. Paling sering diposisikan dalam seni kreatif dan penulisan kreatif, bagaimana mode doktor ini dapat digunakan dalam sains? Artikel yang ditulis oleh tiga akademisi yang berbagi ruang pengawasan inovatif ini mengungkapkan kekuatan dan tantangan yang muncul dari bentuk dan konten inovatif untuk penelitian ini. Tujuan kami adalah untuk membuka ruang transformatif untuk pendidikan doktoral melalui beragam disiplin ilmu.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1SC05829K
Abstract: Micron to submicron size Coriolis and Faraday wave induced high shear topological flow regimes in 45° titled rapidly rotating tubes result in high inter-phase mass transfer of immiscible liquids and spontaneous demixing.
Publisher: Wiley
Date: 12-05-2017
Abstract: The chemical affinity of single-stranded DNA (ssDNA) to adsorb to the surface of single-walled carbon nanotubes (SWCNTs) is used for SWCNT purification, separation and in bio-devices. Despite the popularity of research on SWCNT-ssDNA conjugates, very little work has studied the removal of adsorbed ssDNA on SWCNTs. This paper reports a comprehensive study of biological, physical and chemical treatments for the removal of ssDNA from SWCNT-ssDNA suspensions. These include enzymatic cleavage, heat treatment under vacuum up to 400 °C, chemical treatments with high or low pH, oxidizing conditions, and high-ionic-strength solvents. Complimentary characterization techniques including fluorescence from a DNA-intercalating dye (YO-PRO-1) and photoelectron spectroscopy are used to exhaustively study and compare the methods investigated. Enzyme treatment is found to remove the phosphate backbone only, leaving nucleosides adsorbed to SWCNTs. Heating in inert atmosphere is ineffective at removing ssDNA. Acid, base and oxidative treatment are found to be effective for the removal of ssDNA from SWCNTs. Where possible the mechanism of desorption is described and from the findings suggestions for "best practices" are provided.
Publisher: Wiley
Date: 2005
DOI: 10.1002/SIA.2037
Publisher: Wiley
Date: 22-06-2018
DOI: 10.1002/SIA.6483
Publisher: Elsevier BV
Date: 2004
Publisher: Elsevier BV
Date: 02-2016
Publisher: Wiley
Date: 20-01-2009
DOI: 10.1002/SIA.3010
Publisher: Elsevier BV
Date: 06-2022
Publisher: American Chemical Society (ACS)
Date: 15-02-2016
Publisher: IOP Publishing
Date: 29-11-2011
Publisher: American Institute of Physics
Date: 2009
DOI: 10.1063/1.3203237
Publisher: Elsevier BV
Date: 05-1998
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA03248B
Abstract: A high throughput process is reported for the production of a highly conductive, transparent planar electrode comprising of silver nanowires and single walled carbon nanotubes imbedded into PEDOT:PSS.
Publisher: American Chemical Society (ACS)
Date: 04-06-2012
DOI: 10.1021/LA300077G
Abstract: The structure of the dye layer adsorbed on the titania substrate in a dye-sensitized solar cell is of fundamental importance for the function of the cell, since it strongly influences the injection of photoelectrons from the excited dye molecules into the titania substrate. The adsorption isotherms of the N719 ruthenium-based dye were determined both with a direct method using the depth profiling technique neutral impact collision ion scattering spectroscopy (NICISS) and with the standard indirect solution depletion method. It is found that the dye layer adsorbed on the titania surface is laterally inhomogeneous in thickness and there is a growth mechanism already from low coverage levels involving a combination of monolayers and multilayers. It is also found that the amount of N719 adsorbed on the substrate depends on the titania structure. The present results show that dye molecules in dye-sensitized solar cells are not necessarily, as presumed, adsorbed as a self-assembled monolayer on the substrate.
Publisher: IOP Publishing
Date: 10-12-2012
DOI: 10.1088/0957-4484/24/1/015710
Abstract: Static methods to determine the spring constant of AFM cantilevers have been widely used in the scientific community since the importance of such calibration techniques was established nearly 20 years ago. The most commonly used static techniques involve loading a trial cantilever with a known force by pressing it against a pre-calibrated standard or reference cantilever. These reference cantilever methods have a number of sources of uncertainty, which include the uncertainty in the measured spring constant of the standard cantilever, the exact position of the loading point on the reference cantilever and how closely the spring constant of the trial and reference cantilever match. We present a technique that enables users to minimize these uncertainties by creating spatial markers on reference cantilevers using a focused ion beam (FIB). We demonstrate that by combining FIB spatial markers with an inverted reference cantilever method, AFM cantilevers can be accurately calibrated without the tip of the test cantilever contacting a surface. This work also demonstrates that for V-shaped cantilevers it is possible to determine the precise loading position by AFM imaging the section of the cantilever where the two arms join. Removing tip-to-surface contact in both the reference cantilever method and sensitivity calibration is a significant improvement, since this is an important consideration for AFM users that require the imaging tip to remain in pristine condition before commencing measurements. Uncertainties of between 5 and 10% are routinely achievable with these methods.
Publisher: Trans Tech Publications, Ltd.
Date: 09-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.700.112
Abstract: Simple and up-scalable production of carbon nanotubes (CNTs) still remains difficult with current production methods. Plasma enhanced chemical vapour deposition (PECVD) provides an excellent method for producing high purity and large amounts of carbon nanotubes. This work demonstrates how PECVD can be used to tailor the required properties in the resultant nanotubes produced. By altering only one of the growth variables the resultant CNTs can be altered from single-walled to multi-walled. This was achieved by altering the growth temperature from 450-650°C, altering the growth time and altering the underlying catalyst and supporting layer. High purity SWCNT and MWCNT could be produced and easily distinguished leading to a wide range of applications.
Publisher: Informa UK Limited
Date: 23-03-2015
Publisher: Springer International Publishing
Date: 2013
Publisher: Elsevier BV
Date: 04-2004
Publisher: Wiley
Date: 08-1999
DOI: 10.1002/(SICI)1096-9918(199908)28:1<12::AID-SIA611>3.0.CO;2-O
Publisher: Elsevier BV
Date: 05-2008
Publisher: Polish Academy of Sciences Chancellery
Date: 26-07-2019
Publisher: American Chemical Society (ACS)
Date: 16-02-2021
Publisher: IOP Publishing
Date: 26-09-2008
DOI: 10.1088/0957-4484/19/44/445301
Abstract: A monolayer of hexadecyltrichlorosilane, 3-aminopropyltriethoxysilane or 3-mercaptopropyltrimethoxysilane was self-assembled onto a p-type silicon (100) substrate to provide a resist for electrochemical anodization with an atomic force microscope cantilever. Silane treatment of the oxide nanostructures created by anodization lithography allowed for the creation of a chemically heterogeneous surface, containing regions of -NH(2) or -SH surrounded by -CH(3) functionality. These patterned regions of -NH(2) or -SH provided the point of attachment for citrate-stabilized gold colloid nanoparticles, which act as 'seed' particles for the electro-less deposition of gold. This has allowed the creation of gold wires on a silicon surface. Carbon nanotubes, with high carboxylic acid functionality, were vertically immobilized on the patterned gold wires with the use of a cysteamine monolayer and a condensation reaction. Such a material may prove useful in the creation of future vertically integrated electronic devices where it is desirable for electron transport to be in three dimensions and this electron transport is demonstrated with cyclic voltammetry.
Publisher: IEEE
Date: 02-2008
Publisher: Elsevier BV
Date: 08-2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC04032B
Abstract: A vortex fluid device (VFD) with non-thermal plasma liquid processing within dynamic thin films has been developed.
Publisher: PAGEPress Publications
Date: 12-02-2014
Abstract: Arkaroo Rock, an important Aboriginal art site located in the Flinders Ranges National Park, South Australia, features a range of artworks created using red and yellow ochre along with white minerals (such as kaolinite, and gypsum) and charcoal. The site is widely promoted to tourists and, during peak season, attracts more than fifty visitors each day. In mid 2007, the local indigenous community noted that the art was covered with a dust-like substance, the nature of which was unknown. It was hypothesised that the substance was the result of local soil adhering to the surface of the artwork with the morning dew. In order to preserve the site, cleaning and conservation work began in early 2008. This study presents an investigation into the source of the particulate matter covering the artworks. Prior to the conservation work commencing, s les were collected from various locations on the rock, within the protective fence surrounding the artwork, and the surrounding soil. Plant s les were also collected proximal to the artwork. A number of techniques were used to characterise and identify the origin of the particulate material from the rock surface. These techniques included optical microscopy, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), colour analysis based on the ES-1000 EFI spectrophotometer (UV-Vis), and subsequent multivariate statistical analysis. Results of this study are presented here, including detailed results obtained from an emerging colour-based ES-1000 EFI spectrophotometer method along with TGA, optical microscopy and XRD. Results confirm the presence of morning dew in surface s les, and eliminate local sources as the origin of the particulate matter.
Publisher: Springer Science and Business Media LLC
Date: 25-11-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NA00195G
Abstract: A rapidly rotating tube in the vortex fluidic device imparts submicron topological mass transport regimes, as moulded through crystallisation, polymerisation, and ‘molecular drilling’.
Publisher: SPIE
Date: 28-02-2005
DOI: 10.1117/12.582244
Publisher: Wiley
Date: 2001
DOI: 10.1002/SIA.1052
Publisher: American Chemical Society (ACS)
Date: 04-01-2012
DOI: 10.1021/JP208191C
Publisher: Elsevier BV
Date: 02-2020
Publisher: Mineralogical Society
Date: 10-2008
DOI: 10.1180/MINMAG.2008.072.5.1043
Abstract: Aluminium substitution into goethite, α-FeOOH, has been studied systematically by infrared spectroscopy over the frequency interval 150 to 700 cm -1 . A range of synthetic compositions. (Fe 1-x Al x )OOH, 0 ≤ x ≤ 0.0857, plus end-member diaspore (AlOOH) were examined. The IR spectrum of FeOOH over the range of interest can be deconvoluted into 9 peaks: 670, 633, 497, 451, 409, 396, 360, 290 and 268 cm -1 . With addition of Al, the spectra become broader and the frequencies of the modes shift to higher values. An effective line width parameter Δ corr was determined by autocorrelation analysis for each spectrum and there is a significant increase in the Δ corr for compositions with .85 mol.% Al substitution, indicating that there is very significant structural strain associated with this solid solution at compositions where a significant number of Al sites will have an additional Al atom in the first cation coordination sphere. Trends in the values of Δ corr with composition mirrored published enthalpy of mixing values indicating that Al-goethite is metastable with respect to the goethite and diaspore end-members. The role of substitutional strain and possible partial order of Al is briefly discussed.
Publisher: SPIE
Date: 27-12-2006
DOI: 10.1117/12.695409
Publisher: IEEE
Date: 02-2010
Publisher: IEEE
Date: 2006
Publisher: IEEE
Date: 2006
Location: Australia
No related grants have been discovered for jamie quinton.