ORCID Profile
0000-0002-0849-4223
Current Organisation
Heidelberg University
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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.
Macromolecular and Materials Chemistry | Synthesis of Materials | Physical Chemistry of Materials | Molecular and Organic Electronics | Chemical Characterisation of Materials
Polymeric Materials (e.g. Paints) | Rubber and Synthetic Resins | Expanding Knowledge in Technology |
Publisher: Wiley
Date: 16-08-2019
Abstract: The ability to selectively remove sections from 3D-printed structures with high resolution remains a current challenge in 3D laser lithography. A novel photoresist is introduced to enable the additive fabrication of 3D microstructures at one wavelength and subsequent spatially controlled cleavage of the printed resist at another wavelength. The photoresist is composed of a difunctional acrylate cross-linker containing a photolabile o-nitrobenzyl ether moiety. 3D microstructures are written by photoinduced radical polymerization of acrylates using Ivocerin as photoinitiator upon exposure to 900 nm laser light. Subsequent scanning using a laser at 700 nm wavelength allows for the selective removal of the resist by photocleaving the o-nitrobenzyl group. Both steps rely on two-photon absorption. The fabricated and erased features are imaged using scanning electron microscopy (SEM) and laser scanning microscopy (LSM). In addition, a single wire bond is successfully eliminated from an array, proving the possibility of complete or partial removal of structures on demand.
Publisher: American Chemical Society (ACS)
Date: 15-11-2019
Publisher: Wiley
Date: 04-12-2022
Abstract: Recent studies have opened the door to a new generation of photoinitiators for 3D laser nanoprinting. Therein, the simultaneous absorption of two photons, commonly referred to as two‐photon absorption, is replaced by the sequential absorption of two photons in two consecutive one‐photon absorption processes. This process has been termed two‐step absorption. Importantly, two‐step absorption can be accomplished by inexpensive compact low‐power continuous‐wave blue laser diodes instead of femtosecond laser systems in the red spectral region. Red‐shifting the second absorption step with respect to the first one results in an and‐type optical nonlinearity based on two‐color two‐step absorption. Herein, alternatives are systematically explored to the few already reported one‐ and two‐color two‐step‐absorption photoinitiators, including the search for photoinitiators that can be excited by one‐color two‐step absorption and be de‐excited by a disparate laser color.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC02751K
Abstract: Multi-material 3D microstructures with photochemically adaptive mechanical properties are fabricated and we explore how their photo-responsiveness is related to the parameters that are used during their creation via 3D laser lithography.
Publisher: Wiley
Date: 29-03-2023
Abstract: A photoresist—based on a light‐stabilized dynamic material driven by an out‐of‐equilibrium photo‐Diels–Alder reaction of triazolinediones with naphthalenes—whose ability to intrinsically degrade postprinting can be tuned by a simple adjustment of laser intensity during 3D laser lithography is introduced. The resist's ability to form stable networks under green light irradiation that degrade in the dark is transformed into a tunable degradable 3D printing material platform. In‐depth characterization of the printed microstructures via atomic force microscopy before and during degradation reveals the high dependency of the final structures’ properties on the writing parameters. Upon identifying the ideal writing parameters and their effect on the network structure, it is possible to selectively toggle between stable and fully degradable structures. This simplifies the direct laser writing manufacturing process of multifunctional materials significantly, which typically requires the use of separate resists and consecutive writing efforts to achieve degradable and nondegradable material sections.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1PY00794G
Abstract: Solution-processing of multi-layered Organic Light Emitting Diodes (OLEDs) remains challenging. Herein, we introduce a facile blending process of emitting polymers with photoreactive polymer strands, allowing for the generation of solvent resistant emissive layers.
Publisher: Wiley
Date: 09-07-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7PY01278K
Abstract: We provide the results of a critical literature survey on the reported sizes of single chain polymer nanoparticles (SCNPs) employing different techniques.
Publisher: Wiley
Date: 23-01-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC01054D
Abstract: A simple and versatile tool for generating fluorescent single chain polymer nanoparticles with visible light.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 25-09-2020
Abstract: Using stimuli-responsive hydrogels, we 3D print composite microscaffolds to analyze mechanobiology on the single-cell level.
Publisher: American Chemical Society (ACS)
Date: 26-06-2019
DOI: 10.1021/JACS.9B05092
Abstract: The light-responsive adaptation of polymer materials typically requires different wavelengths or additional heat to induce reversible covalent bond formation and dissociation. Here, we bypass the use of invasive triggers by introducing light-stabilized dynamic materials that can undergo a repeatable change in topology from a covalently cross-linked material into a liquid polymer formulation by switching one visible light source on-and-off without the need for any additional triggers. Specifically, we exploit the photo-Diels-Alder reaction of triazolinediones with naphthalenes as a dynamic covalent cross-linking platform that enables green light-induced network formation, while the cross-linked material collapses through spontaneous cycloreversion upon standing in the dark at ambient temperature. Importantly, the covalent cross-links remain stabilized for as long as visible light is present, thereby retaining the material's structural integrity. This enables their potential use in an array of light-directed applications whereby network properties such as stiffness can be tuned by the mildest trigger of all: darkness.
Publisher: Springer Science and Business Media LLC
Date: 16-01-2019
DOI: 10.1038/S41467-018-08175-W
Abstract: Stimuli-responsive microstructures are critical to create adaptable systems in soft robotics and biosciences. For such applications, the materials must be compatible with aqueous environments and enable the manufacturing of three-dimensional structures. Poly( N -isopropylacrylamide) (pNIPAM) is a well-established polymer, exhibiting a substantial response to changes in temperature close to its lower critical solution temperature. To create complex actuation patterns, materials that react differently with respect to a stimulus are required. Here, we introduce functional three-dimensional hetero-microstructures based on pNIPAM. By variation of the local exposure dose in three-dimensional laser lithography, we demonstrate that the material parameters can be altered on demand in a single resist formulation. We explore this concept for sophisticated three-dimensional architectures with large- litude and complex responses. The experimental results are consistent with numerical calculations, able to predict the actuation response. Furthermore, a spatially controlled response is achieved by inducing a local temperature increase by two-photon absorption of focused light.
Publisher: Wiley
Date: 23-01-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC02735A
Abstract: We report the first ink-jet printed thermally activated delayed fluorescence (TADF) polymer organic light emitting diode (OLED).
Publisher: Springer Science and Business Media LLC
Date: 27-02-2023
DOI: 10.1038/S41467-023-36722-7
Abstract: Printed organic and inorganic electronics continue to be of large interest for sensors, bioelectronics, and security applications. Many printing techniques have been investigated, albeit often with typical minimum feature sizes in the tens of micrometer range and requiring post-processing procedures at elevated temperatures to enhance the performance of functional materials. Herein, we introduce laser printing with three different inks, for the semiconductor ZnO and the metals Pt and Ag, as a facile process for fabricating printed functional electronic devices with minimum feature sizes below 1 µm. The ZnO printing is based on laser-induced hydrothermal synthesis. Importantly, no sintering of any sort needs to be performed after laser printing for any of the three materials. To demonstrate the versatility of our approach, we show functional diodes, memristors, and a physically unclonable function based on a 6 × 6 memristor crossbar architecture. In addition, we realize functional transistors by combining laser printing and inkjet printing.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CC00124H
Abstract: Herein, we incorporate photosensitive ortho -Nitrobenzyl units into polyurethanes to achieve controllable photodegradability. We performed their photolysis in solution and thin films which can inform the design of degradable adhesives.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9PY00834A
Abstract: We introduce a facile photoinduced self-reporting crosslinking methodology for the compaction of polymer chains in highly diluted solution.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1PY00032B
Abstract: Tetrazole-driven photochemistry is exploited for the stabilization of self-assembled morphologies via light-triggered nitrile imine carboxylic acid ligation (NICAL).
Publisher: Research Square Platform LLC
Date: 28-10-2022
DOI: 10.21203/RS.3.RS-2201014/V1
Abstract: Printed organic and inorganic electronics continue to be of large interest for sensors, bioelectronics, and security applications. Many printing techniques have been investigated, albeit often with typical minimum feature sizes in the tens of micrometer range and requiring post-processing procedures at elevated temperatures to enhance the performance of functional materials. Herein, we introduce laser printing of the semiconductor ZnO and the metals Pt and Ag by laser-induced hydrothermal synthesis and multi-photon reduction, respectively, as a facile process for fabricating printed functional electronic devices with minimum feature sizes below 1 µm. Importantly, no sintering of any sort needs to be performed after laser printing the focused laser light itself induces the necessary local sintering during the printing process. To demonstrate the versatility of our approach, we show functional diodes, memristors, and a physically unclonable function based on a 6×6 memristor crossbar architecture. In addition, we realize functional transistors by combining laser printing and inkjet printing.
Publisher: Wiley
Date: 19-12-2019
Publisher: Wiley
Date: 07-10-2020
Publisher: American Chemical Society (ACS)
Date: 15-01-2019
Publisher: Springer Science and Business Media LLC
Date: 13-10-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2PY00511E
Abstract: Herein, we compare a series of solution-processible TADF polymers with different host pendant groups to achieve balanced charge transport properties through the combination of unipolar co-hosts.
Publisher: American Chemical Society (ACS)
Date: 10-01-2022
DOI: 10.1021/JACS.1C11259
Abstract: The careful mapping of photoinduced reversible-deactivation radical polymerizations (RDRP) is a prerequisite for their applications in soft matter materials design. Here, we probe the wavelength-dependent behavior of photochemically induced atom transfer radical polymerization (ATRP) using nanosecond pulsed-laser polymerization (PLP). The photochemical reactivities at identical photon fluxes of methyl acrylate in terms of conversion, number-average molecular weight, and dispersity of the resulting polymers are mapped against the absorption spectrum of the copper(II) catalyst in the range of 305-550 nm. We observe a red shift of the action spectrum relative to the absorption spectrum of the copper(II) catalyst. Both the number-average molecular weight and the dispersity show a wavelength dependence, while the molecular weight and conversion remain linearly correlated. The reported data allow the judicious selection of optimum wavelengths for photoATRP.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CC09619D
Abstract: A λ-orthogonal reaction system is introduced, where visible light induced radical thiol–ene and UV light induced NITEC (Nitrile-Imine mediated Tetrazole–Ene Conjugation) ligations are consecutively employed to fabricate and functionalize PEG-based hydrogels.
Publisher: American Chemical Society (ACS)
Date: 14-12-2022
Publisher: American Chemical Society (ACS)
Date: 26-06-2017
Start Date: 10-2018
End Date: 10-2022
Amount: $364,503.00
Funder: Australian Research Council
View Funded ActivityStart Date: 01-2018
End Date: 06-2022
Amount: $159,916.00
Funder: Australian Research Council
View Funded Activity