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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Main Author: Lay, Chee Leng
Other Authors: Ling Xing Yi
Format: Theses and Dissertations
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/103320
http://hdl.handle.net/10220/47381
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Institution: Nanyang Technological University
Language: English
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spelling 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
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Chemistry
spellingShingle DRNTU::Science::Chemistry
Lay, Chee Leng
Two-photon lithography for reconfigurable microstructures
description 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.
author2 Ling Xing Yi
author_facet Ling Xing Yi
Lay, Chee Leng
format Theses and Dissertations
author Lay, Chee Leng
author_sort 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
title_fullStr Two-photon lithography for reconfigurable microstructures
title_full_unstemmed Two-photon lithography for reconfigurable microstructures
title_sort two-photon lithography for reconfigurable microstructures
publishDate 2019
url https://hdl.handle.net/10356/103320
http://hdl.handle.net/10220/47381
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