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Preparation of Nanoribbons and Monolayers for Fundamental Characterization of Optical, Electronic, and Magnetic Properties
Preparation of Nanoribbons and Monolayers for Fundamental Characterization of Optical, Ele...
Preparation of Nanoribbons and Monolayers for Fundamental Characterization of Optical, Electronic, and Magnetic Properties

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자료유형  
 학위논문 서양
최종처리일시  
20260202105611
ISBN  
9798265427113
DDC  
553.41
저자명  
Saunders, Ashley Paige.
서명/저자  
Preparation of Nanoribbons and Monolayers for Fundamental Characterization of Optical, Electronic, and Magnetic Properties
발행사항  
[Sl] : Stanford University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
102 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Liu, Fang.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2025.
초록/해제  
요약van der Waals materials, like graphene, have gained gross interest in materials science, chemistry, physics, and adjacent fields due to their access, versatility, and promise in electronic devices. These layered structures have weak interlayer interactions that allow for isolation of one layer (monolayer) from the natural bulk crystal by exfoliation (i.e. scotch tape exfoliation1, gold-assisted methods2, etc.). The model system of transition metal dichalcogenides (TMDs) exhibits dimensionally dependent properties, where three-dimensional (3D) crystals function as insulators and isolated two-dimensional (2D) monolayers act as semiconductors. This initial confinement of TMDs into 2D materials sheets that are a few atoms in thickness has been widely studied as synthesis and exfoliation methods became more accessible. Studied properties include light absorption/emission, chemical stability/reactivity, and electronic performance for a wide variety of electronic applications.Throughout my PhD I greatly expanded the field of 2D materials through collaborative projects by exploring how TMD monolayers can act as atomically thin waveguides,3 contribute to up conversion processes when interfaced with plasmonic gold nanoparticles,4 electronically and physically interact with other TMDs in heterobilayers,5 integrate with metal halide perovskites and metasurfaces in spin-injection heterostructures, and more. These studies hold great implications for next generation electronics for light emission, light manipulation, and tailored chemical sensing/reactivity, and all were accessed through large area exfoliation of monolayer TMDs.Further confinement of 2D sheets into one-dimensional (1D) nanoribbons had been predicted to lead to new optical, electronic, and magnetic phenomena that could enhance their viability in integrated circuits to keep up with Moore's Law. In Chapter 1 I disclose how the availability of nanoribbon species beyond graphene has been limited due to non-transferable preparation methods. I combatted this problem by developing the first versatile technique to prepare monolayer, single-crystalline and parallel aligned nanoribbons from a variety of bulk vdW crystals in.6 This opens the gateway for fundamental experimental characterization of 2D nanoribbon structures in comparison to their bulk and large area monolayer counterparts.This dissertation work showcases this collaborative excursion and highlights the experimental optical, electronic, and magnetic properties of exfoliated nanoribbons to gauge their footing in optoelectronic, sensing, and catalysis applications. In Chapter 2, initial fundamental characterization of nanoribbons is carried out in relation to their monolayer counterparts finding that there is an influence of strain, aspect ratio, and doping on properties like photoluminescence, second harmonic generation, and electronic/electrostatic environment respectively.I then move on to more targeted studies on nanoribbons. This includes an investigation into the impact of localized strain on sharp photoluminescence features in Chapter 3.7 Next, I offer an exploration into local doping distributions in WSe2 nanoribbons via spatially resolved tip-enhanced Raman spectroscopy in Chapter 4. Finally, I revisit the implications of the experimental findings with an outlook towards integrated circuits and sensors in Chapter 5.References1. K. S. Novoselov, A. K. Geim, S. V. Morozov, et al. Science. 2004, 306, 666. 2. F. Liu, W. Wu, Y. Bai, et al. Science. 2020, 367, 903.
일반주제명  
Gold
일반주제명  
Investigations
일반주제명  
Nanomaterials
일반주제명  
Molecular beam epitaxy
일반주제명  
Energy
일반주제명  
Graphene
일반주제명  
Transistors
일반주제명  
Engineers
일반주제명  
Scanning electron microscopy
일반주제명  
Integrated circuits
일반주제명  
Lasers
일반주제명  
Etching
일반주제명  
Teaching assistants
일반주제명  
Optical properties
일반주제명  
Crystal lattices
일반주제명  
Analytical chemistry
일반주제명  
Electrical engineering
일반주제명  
Nanotechnology
일반주제명  
Optics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

 008260126s2025        us                              c    eng  d
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■0820  ▼a553.41
■1001  ▼aSaunders,  Ashley  Paige.
■24510▼aPreparation  of  Nanoribbons  and  Monolayers  for  Fundamental  Characterization  of  Optical,  Electronic,  and  Magnetic  Properties
■260    ▼a[Sl]▼bStanford  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a102  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Liu,  Fang.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2025.
■520    ▼avan  der  Waals  materials,  like  graphene,  have  gained  gross  interest  in  materials  science,  chemistry,  physics,  and  adjacent  fields  due  to  their  access,  versatility,  and  promise  in  electronic  devices.  These  layered  structures  have  weak  interlayer  interactions  that  allow  for  isolation  of  one  layer  (monolayer)  from  the  natural  bulk  crystal  by  exfoliation  (i.e.  scotch  tape  exfoliation1,  gold-assisted  methods2,  etc.).  The  model  system  of  transition  metal  dichalcogenides  (TMDs)  exhibits  dimensionally  dependent  properties,  where  three-dimensional  (3D)  crystals  function  as  insulators  and  isolated  two-dimensional  (2D)  monolayers  act  as  semiconductors.  This  initial  confinement  of  TMDs  into  2D  materials  sheets  that  are  a  few  atoms  in  thickness  has  been  widely  studied  as  synthesis  and  exfoliation  methods  became  more  accessible.  Studied  properties  include  light  absorption/emission,  chemical  stability/reactivity,  and  electronic  performance  for  a  wide  variety  of  electronic  applications.Throughout  my  PhD  I  greatly  expanded  the  field  of  2D  materials  through  collaborative  projects  by  exploring  how  TMD  monolayers  can  act  as  atomically  thin  waveguides,3  contribute  to  up  conversion  processes  when  interfaced  with  plasmonic  gold  nanoparticles,4  electronically  and  physically  interact  with  other  TMDs  in  heterobilayers,5  integrate  with  metal  halide  perovskites  and  metasurfaces  in  spin-injection  heterostructures,  and  more.  These  studies  hold  great  implications  for  next  generation  electronics  for  light  emission,  light  manipulation,  and  tailored  chemical  sensing/reactivity,  and  all  were  accessed  through  large  area  exfoliation  of  monolayer  TMDs.Further  confinement  of  2D  sheets  into  one-dimensional  (1D)  nanoribbons  had  been  predicted  to  lead  to  new  optical,  electronic,  and  magnetic  phenomena  that  could  enhance  their  viability  in  integrated  circuits  to  keep  up  with  Moore's  Law.  In  Chapter  1  I  disclose  how  the  availability  of  nanoribbon  species  beyond  graphene  has  been  limited  due  to  non-transferable  preparation  methods.  I  combatted  this  problem  by  developing  the  first  versatile  technique  to  prepare  monolayer,  single-crystalline  and  parallel  aligned  nanoribbons  from  a  variety  of  bulk  vdW  crystals  in.6  This  opens  the  gateway  for  fundamental  experimental  characterization  of  2D  nanoribbon  structures  in  comparison  to  their  bulk  and  large  area  monolayer  counterparts.This  dissertation  work  showcases  this  collaborative  excursion  and  highlights  the  experimental  optical,  electronic,  and  magnetic  properties  of  exfoliated  nanoribbons  to  gauge  their  footing  in  optoelectronic,  sensing,  and  catalysis  applications.  In  Chapter  2,  initial  fundamental  characterization  of  nanoribbons  is  carried  out  in  relation  to  their  monolayer  counterparts  finding  that  there  is  an  influence  of  strain,  aspect  ratio,  and  doping  on  properties  like  photoluminescence,  second  harmonic  generation,  and  electronic/electrostatic  environment  respectively.I  then  move  on  to  more  targeted  studies  on  nanoribbons.  This  includes  an  investigation  into  the  impact  of  localized  strain  on  sharp  photoluminescence  features  in  Chapter  3.7  Next,  I  offer  an  exploration  into  local  doping  distributions  in  WSe2  nanoribbons  via  spatially  resolved  tip-enhanced  Raman  spectroscopy  in  Chapter  4.  Finally,  I  revisit  the  implications  of  the  experimental  findings  with  an  outlook  towards  integrated  circuits  and  sensors  in  Chapter  5.References1.  K.  S.  Novoselov,  A.  K.  Geim,  S.  V.  Morozov,  et  al.  Science.  2004,  306,  666.  2.  F.  Liu,  W.  Wu,  Y.  Bai,  et  al.  Science.  2020,  367,  903.
■590    ▼aSchool  code:  0212.
■650  4▼aGold
■650  4▼aInvestigations
■650  4▼aNanomaterials
■650  4▼aMolecular  beam  epitaxy
■650  4▼aEnergy
■650  4▼aGraphene
■650  4▼aTransistors
■650  4▼aEngineers
■650  4▼aScanning  electron  microscopy
■650  4▼aIntegrated  circuits
■650  4▼aLasers
■650  4▼aEtching
■650  4▼aTeaching  assistants
■650  4▼aOptical  properties
■650  4▼aCrystal  lattices
■650  4▼aAnalytical  chemistry
■650  4▼aElectrical  engineering
■650  4▼aNanotechnology
■650  4▼aOptics
■690    ▼a0791
■690    ▼a0486
■690    ▼a0544
■690    ▼a0652
■690    ▼a0752
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360728▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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