Laser-induced carbonization and graphitization of a transparent elastomer (本文)

概要

Carbonaceous materials such as graphite, diamond, and carbides each possesses unique
material properties distinctive to their chemical structure, and have been applied to a wide
range of applications. Laser-induced carbonization and graphitization, or LICG, offers
the patterning of carbonaceous structures composed of various carbonaceous materials by
simply scanning laser light on a polymer. This thesis discusses the chemical and physical
processes that ensues as a result of light-matter interactions between the laser light and a
transparent elastomer, polydimethylsiloxane (PDMS), and aims to clarify the mechanism
in which carbonaceous structures form by LICG and the effects of the carbonaceous
materials on the electrical properties of the carbonaceous structure, as well as to apply the
carbonaceous structures towards novel devices. This thesis consists of seven chapters.
Chapter 1 introduces the background and aim of this thesis. Chapter 2 outlines the
chemical and physical processes that ensues as a result of laser irradiation, and provides
the theoretical concepts required to discuss the subsequent experimental results. Chapters
3 and 4 will describe the experimental results regarding the basic characterizations of the
carbonaceous structures patterned on the PDMS surface by LICG. Chapter 3 will examine
the structural aspects of the carbonaceous structures. The mechanisms regarding the
formation of carbonaceous structures, and the relationship between laser parameters and
structure morphology will be discussed. Chapter 4 will address the electrical property of
the carbonaceous structures. The patterning of carbonaceous structures exhibiting
different electrical properties is demonstrated by LICG, and the effects of graphitic carbon
and SiC-NCs on the electrical property of the overall structure will be discussed. Chapters
5 and 6 will describe the experimental results regarding the application of carbonaceous
structures patterned on PDMS by LICG. Chapter 5 will focus on electrical applications
using the carbonaceous structures. The piezoresistive properties of the structures are
assessed by strain tests, and the fabrication of a micro-pressure sensor and an anisotropic
strain sensor will be demonstrated. Chapter 6 will explore optical applications using the
carbonaceous structures. It is revealed that fluorescent carbonaceous structures can be
patterned by the LICG of PDMS, and the fabrication of an anti-counterfeiting security tag
will be demonstrated. Moreover, by utilizing multiphoton interactions. the patterning of
fluorescent carbonaceous structures inside PDMS will be demonstrated. Chapter 7 will
provide the conclusion of this thesis, summarizing the key findings of each chapter and
the thesis, then discuss future studies which have been triggered by this thesis. ...

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