To analytic the physical features of two-dimensional nanomaterials by using Raman Spectroscopy

  • 王 永紳

Student thesis: Master's Thesis

Abstract

Researchers have examined recent developments in research on optical features of Raman spectra and Photoluminescence (PL) spectra among several two-dimensional materials and nanomaterials Such research could be applied to realize surface plasmon transport in AAO film Others have focused on strain-induced electronic structure change polarization-dependent studies on Molybdenum disulfide (MoS2) Laser annealing on AAO film and electric properties of MoS2 transistor with gate voltage were relatively unexplored Thus the paper studied the evolution of PL spectra as a function of laser annealing power on AAO film and the Raman profiles with different top gate voltage on MoS2 transistor especially for direct-current (DC) and alternating-current (AC) applied gate voltage The findings of PL spectra and Raman spectra were categorized and quantified in order to ascertain the optical mechanisms of the samples under distinct external field effects The results revealed that the annealed AAO film with less anion impurity content due to the pyrolysis resulting in weaker attraction of Al^(3+) to form Al2O3 as a function of annealing power The broadening of linewidth for A1g mode was a result of strengthening of electron-phonon coupling with increased gate voltage (Vg) Peak intensity increased slightly with AC gate frequency from 0 MHz to 5 MHz and decreased to 20 MHz
Date of Award2016 Jun 16
Original languageEnglish
SupervisorHsiang-Chen Chui (Supervisor)

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