Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/73084
Title: Fabrication and applications of metallic and polymeric smart materials using two-photon lithography
Authors: Lee, Mian Rong
Keywords: DRNTU::Engineering::Materials::Nanostructured materials
Issue Date: 2018
Source: Lee, M. R. (2018). Fabrication and applications of metallic and polymeric smart materials using two-photon lithography. Doctoral thesis, Nanyang Technological University, Singapore.
Abstract: This thesis details my PhD research from the past four years focused on the fabrication and applications of metallic and polymeric shape-shifting “smart” materials using the technique of twophoton lithography. I begin the thesis with a brief introduction into the principles of two-photon lithography, followed by applications of two-photon lithography in the fabrication of polymeric shapeshifting materials, and the direct laser writing of metallic structures. From the fabrication of polymeric shape-shifting materials, the main challenges I identify are that currently, (1) most of the polymeric shape-shifting materials are macroscale, and (2) usually exhibit only directional shape change such as bending or twisting. I aim to resolve these issues by demonstrating the fabrication of 10 - 30 μm sized shape-shifting protein microstructures that are not only able to undergo quantifiable directional shape-shifting (chapter 2), but also geometrical shapeshifting from circles to polygons such as triangles, square, pentagons and hexagons (chapter 3). I also discuss some of the challenges faced in direct metal writing; for instance, although direct metal writing has been explored extensively for the past decade, most fabricated structures comprise sparse, or dense but irregularly shaped nanoparticles. I aim to fabricate monodisperse, dense gold nanoparticle microstructures where the physical and optical properties can be tuned by varying surfactant concentration, and fabricate these microstructures within a microfluidic channel for SERS sensing of small gaseous molecules (chapter 4). I also recognise that the precision and morphology of fabricated metallic structures are largely dependent on the fabrication parameters and composition of the photoresist used, however, an investigation into the effects of varying fabrication parameters on the resulting structure is lacking. Hence, I create a robust Au precursor solution and optimized the writing parameters to fabricate highly precise, well-defined Au microstructures even after long hours of lithography (~4 hours) (chapter 5). Finally, I conclude the thesis with a short summary and outlook to discuss future work in the field of two-photon fabrication (chapter 6).
URI: http://hdl.handle.net/10356/73084
DOI: 10.32657/10356/73084
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Theses

Files in This Item:
File Description SizeFormat 
PhD Thesis_SPMS-CBC_Aug 2017_Lee Mian Rong_G1300515L.pdfThesis6.24 MBAdobe PDFThumbnail
View/Open

Page view(s)

187
Updated on May 9, 2021

Download(s) 50

70
Updated on May 9, 2021

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.