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Cryogenic Electron Microscopy Approaches to Nanoscale Characterization of Beam-Sensitive Materials
Cryogenic Electron Microscopy Approaches to Nanoscale Characterization of Beam-Sensitive M...
Cryogenic Electron Microscopy Approaches to Nanoscale Characterization of Beam-Sensitive Materials

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105153
ISBN  
9798273309449
DDC  
530
저자명  
Colletta, Michael.
서명/저자  
Cryogenic Electron Microscopy Approaches to Nanoscale Characterization of Beam-Sensitive Materials
발행사항  
[Sl] : Cornell University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
167 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-07, Section: B.
주기사항  
Advisor: Muller, David.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2025.
초록/해제  
요약Cryogenic electron microscopy enables structural and spectroscopic characterization of beam-sensitive materials that are otherwise unstable under conventional imaging conditions. Many functional interfaces in energy and environmental systems, such as solid-electrolyte interphases in lithium batteries, ionomer films in fuel cells, and pigment-binder matrices in cultural heritage materials, are chemically reactive, physically volatile, or highly susceptible to radiolysis and contamination. Cryogenic workflows preserve these systems in vitrified or low-temperature states, allowing transmission electron microscopy (TEM), scanning TEM (STEM), and electron energy-loss spectroscopy (EELS) to operate within safe dose limits while maintaining access to nanoscale structural and chemical detail. This thesis applies cryo-TEM, cryo-STEM, cryo-EELS, and cryo-focused ion beam (cryo-FIB) milling to enable nanoscale characterization across a range of beam-sensitive energy materials. A dimensionality reduction framework is developed to extract chemically meaningful information from low-signal STEM-EELS datasets, allowing multilayered interphases at lithium-metal interfaces to be spatially resolved. In alkaline fuel-cell catalyst layers, cryogenic imaging distinguishes ionomer from carbon support and identifies contamination artifacts that arise at room-temperature. Film thickness and coverage are quantified as functions of deposition method and solvent formulation. In historical CdS-based pigments, cryo-STEM imaging reveals stacking disorder in individual nanocrystals, and density functional theory (DFT) modeling shows how such disorder modulates exciton behavior and promotes degradation under illumination. Across all three systems, cryogenic electron microscopy extends the analytical reach of electron imaging and spectroscopy into materials that would otherwise degrade, transform, or contaminate during preparation and acquisition. The techniques demonstrated here enable direct measurement of chemical bonding, structural order, and interface morphology in complex, radiation-sensitive systems. Together, these studies establish cryo-EM as a versatile platform for nanoscale characterization of reactive soft matter, with implications for electrochemical performance, materials stability, and long-term degradation across both modern energy devices and historical materials.
일반주제명  
Applied physics
일반주제명  
Alternative energy
일반주제명  
Electrical engineering
키워드  
Beam sensitive materials
키워드  
Electron energy loss spectroscopy
키워드  
Electron microscopy
키워드  
Renewable energy materials
기타저자  
Cornell University Applied Physics
기본자료저록  
Dissertations Abstracts International. 87-07B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798273309449
■035    ▼a(MiAaPQ)AAI32242699
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aColletta,  Michael.
■24510▼aCryogenic  Electron  Microscopy  Approaches  to  Nanoscale  Characterization  of  Beam-Sensitive  Materials
■260    ▼a[Sl]▼bCornell  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a167  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-07,  Section:  B.
■500    ▼aAdvisor:  Muller,  David.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2025.
■520    ▼aCryogenic  electron  microscopy  enables  structural  and  spectroscopic  characterization  of  beam-sensitive  materials  that  are  otherwise  unstable  under  conventional  imaging  conditions.  Many  functional  interfaces  in  energy  and  environmental  systems,  such  as  solid-electrolyte  interphases  in  lithium  batteries,  ionomer  films  in  fuel  cells,  and  pigment-binder  matrices  in  cultural  heritage  materials,  are  chemically  reactive,  physically  volatile,  or  highly  susceptible  to  radiolysis  and  contamination.  Cryogenic  workflows  preserve  these  systems  in  vitrified  or  low-temperature  states,  allowing  transmission  electron  microscopy  (TEM),  scanning  TEM  (STEM),  and  electron  energy-loss  spectroscopy  (EELS)  to  operate  within  safe  dose  limits  while  maintaining  access  to  nanoscale  structural  and  chemical  detail.            This  thesis  applies  cryo-TEM,  cryo-STEM,  cryo-EELS,  and  cryo-focused  ion  beam  (cryo-FIB)  milling  to  enable  nanoscale  characterization  across  a  range  of  beam-sensitive  energy  materials.  A  dimensionality  reduction  framework  is  developed  to  extract  chemically  meaningful  information  from  low-signal  STEM-EELS  datasets,  allowing  multilayered  interphases  at  lithium-metal  interfaces  to  be  spatially  resolved.  In  alkaline  fuel-cell  catalyst  layers,  cryogenic  imaging  distinguishes  ionomer  from  carbon  support  and  identifies  contamination  artifacts  that  arise  at  room-temperature.  Film  thickness  and  coverage  are  quantified  as  functions  of  deposition  method  and  solvent  formulation.  In  historical  CdS-based  pigments,  cryo-STEM  imaging  reveals  stacking  disorder  in  individual  nanocrystals,  and  density  functional  theory  (DFT)  modeling  shows  how  such  disorder  modulates  exciton  behavior  and  promotes  degradation  under  illumination.            Across  all  three  systems,  cryogenic  electron  microscopy  extends  the  analytical  reach  of  electron  imaging  and  spectroscopy  into  materials  that  would  otherwise  degrade,  transform,  or  contaminate  during  preparation  and  acquisition.  The  techniques  demonstrated  here  enable  direct  measurement  of  chemical  bonding,  structural  order,  and  interface  morphology  in  complex,  radiation-sensitive  systems.  Together,  these  studies  establish  cryo-EM  as  a  versatile  platform  for  nanoscale  characterization  of  reactive  soft  matter,  with  implications  for  electrochemical  performance,  materials  stability,  and  long-term  degradation  across  both  modern  energy  devices  and  historical  materials.
■590    ▼aSchool  code:  0058.
■650  4▼aApplied  physics
■650  4▼aAlternative  energy
■650  4▼aElectrical  engineering
■653    ▼aBeam  sensitive  materials
■653    ▼aElectron  energy  loss  spectroscopy
■653    ▼aElectron  microscopy
■653    ▼aRenewable  energy  materials
■690    ▼a0215
■690    ▼a0544
■690    ▼a0363
■71020▼aCornell  University▼bApplied  Physics.
■7730  ▼tDissertations  Abstracts  International▼g87-07B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359660▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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