Two-photon lithography for reconfigurable microstructures
Two-photon lithography is a promising three-dimensional (3D) laser writing technique to construct miniature structures at the sub-micrometer to micrometer length scale. Moreover, two-photon lithography can achieve structures with spatial resolution down to 120 nm, and this lithographic techniq...
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sg-ntu-dr.10356-1033202023-02-28T23:53:46Z Two-photon lithography for reconfigurable microstructures Lay, Chee Leng Ling Xing Yi School of Physical and Mathematical Sciences DRNTU::Science::Chemistry Two-photon lithography is a promising three-dimensional (3D) laser writing technique to construct miniature structures at the sub-micrometer to micrometer length scale. Moreover, two-photon lithography can achieve structures with spatial resolution down to 120 nm, and this lithographic technique is highly flexible in constructing arbitrary shapes and architectures. However, two-photon lithography is limited by the typical use of epoxy based and acrylate-based photoresists, and hence the developed structures are typically stationary microstructures. There is currently no stable aqueous-based stimuli-responsive hydrogel photoresists for the construction of shape-shifting microstructures. The objectives of my thesis aim to render acrylate microstructures a new function as plasmonic anti counterfeiting substrates with two-tier of security features (Chapter 2), and to formulate aqueous-based stimuli-responsive hydrogel photoresists for constructing shape-shifting biomimetic microstructures (Chapter 3 to Chapter 5). In Chapter 3, we create a formulation for a protein-based photoresist, which allows stable and consistent fabrication during two photon laser writing process. This is a major breakthrough in generating aqueous-based polymer photoresists for construction three-dimensional (3D) of suspending and high aspect-ratio (HAR ≥ 10) hydrogel microstructures. By using the established protein photoresist, we also accomplish the first Kagome arrays of pH-responsive dynamically shape-shifting microstructures (Chapter 4). The shape-shifting microstructures undergo reversible shape change from polygons to circles against external pH, hence grant reconfigurability to the Kagome arrays. In Chapter 5, two-photon polymerizable aqueous based N-isopropylacrylamide (NIPAAm) photoresist is formulated. Effects of processing parameters are systematically investigated for the construction of structurally stable temperature-responsive microstructures. Lastly, in Chapter 6, I outline my four-year PhD research project and present an outlook on significant progress on future design of multi-functional “smart” microstructures. Doctor of Philosophy 2019-01-04T13:10:32Z 2019-12-06T21:09:55Z 2019-01-04T13:10:32Z 2019-12-06T21:09:55Z 2018 Thesis Lay, C. L. (2018). Two-photon lithography for reconfigurable microstructures. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/103320 http://hdl.handle.net/10220/47381 10.32657/10220/47381 en 169 p. application/pdf |
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DRNTU::Science::Chemistry Lay, Chee Leng Two-photon lithography for reconfigurable microstructures |
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Two-photon lithography is a promising three-dimensional (3D) laser writing technique
to construct miniature structures at the sub-micrometer to micrometer length scale.
Moreover, two-photon lithography can achieve structures with spatial resolution down to
120 nm, and this lithographic technique is highly flexible in constructing arbitrary shapes
and architectures. However, two-photon lithography is limited by the typical use of epoxy
based and acrylate-based photoresists, and hence the developed structures are typically
stationary microstructures. There is currently no stable aqueous-based stimuli-responsive
hydrogel photoresists for the construction of shape-shifting microstructures. The objectives
of my thesis aim to render acrylate microstructures a new function as plasmonic anti
counterfeiting substrates with two-tier of security features (Chapter 2), and to formulate
aqueous-based stimuli-responsive hydrogel photoresists for constructing shape-shifting
biomimetic microstructures (Chapter 3 to Chapter 5). In Chapter 3, we create a formulation
for a protein-based photoresist, which allows stable and consistent fabrication during two
photon laser writing process. This is a major breakthrough in generating aqueous-based
polymer photoresists for construction three-dimensional (3D) of suspending and high
aspect-ratio (HAR ≥ 10) hydrogel microstructures. By using the established protein
photoresist, we also accomplish the first Kagome arrays of pH-responsive dynamically
shape-shifting microstructures (Chapter 4). The shape-shifting microstructures undergo
reversible shape change from polygons to circles against external pH, hence grant
reconfigurability to the Kagome arrays. In Chapter 5, two-photon polymerizable aqueous
based N-isopropylacrylamide (NIPAAm) photoresist is formulated. Effects of processing
parameters are systematically investigated for the construction of structurally stable
temperature-responsive microstructures. Lastly, in Chapter 6, I outline my four-year PhD research project and present an outlook on significant progress on future design of multi-functional “smart” microstructures. |
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Ling Xing Yi |
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Ling Xing Yi Lay, Chee Leng |
format |
Theses and Dissertations |
author |
Lay, Chee Leng |
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Lay, Chee Leng |
title |
Two-photon lithography for reconfigurable microstructures |
title_short |
Two-photon lithography for reconfigurable microstructures |
title_full |
Two-photon lithography for reconfigurable microstructures |
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Two-photon lithography for reconfigurable microstructures |
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Two-photon lithography for reconfigurable microstructures |
title_sort |
two-photon lithography for reconfigurable microstructures |
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2019 |
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https://hdl.handle.net/10356/103320 http://hdl.handle.net/10220/47381 |
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