dc.contributor.advisor Vecitis, Chad dc.contributor.author Silverberg, Gregory John dc.date.accessioned 2019-05-20T10:23:37Z dc.date.created 2017-05 dc.date.issued 2017-05-11 dc.date.submitted 2017 dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:40046495 * dc.description.abstract Pristine graphene remains cost-prohibitive for most commercial applications. The synthesis cost of graphene oxide is several orders of magnitude lower than that of pristine graphene, but it is highly defected and decorated with oxygen functional groups. Some of the properties of graphene oxide are comparable to those of graphene (e.g. specific surface area, flexibility, and transparency), other properties are degraded (e.g. conductivity, mechanical strength), and still other properties are unique to graphene oxide (e.g. colloidal stability, surface charge, chemical pliability). Nonetheless, like graphene, many of graphene oxide's properties require that it to be used as a monolayer and not as a stacked multilayer. The Langmuir-Blodgett technique is one method to deposit monolayers of graphene oxide onto a solid substrate. In this thesis, the properties and potential applications of graphene oxide Langmuir-Blodgett films are investigated. In addition to fundamental studies of the Langmuir-Blodgett method itself (Part I), technological studies on the impact of GO monolayer morphology and chemistry on capacitive performance are presented (Part II). In Chapter 1, an introduction to graphene oxide, the Langmuir-Blodgett method, and capacitive energy storage are presented. In Chapter 2, the forces between and within graphene oxide sheets adsorbed to the air-water interface are investigated including the aggregation and clustering of GO. Chapter 3 discusses a method of GO compression at the air-water interface (periodic pulsing compression'') which allows for measurement of the onset of elastic behavior, jamming, and ultimately out-of-plane deformations. This method is the first demonstration in the literature of nano-scale control over the surface roughness of deposited Langmuir-Blodgett films. In chapter 4, GO monolayers are wrinkled and folded using the Langmuir-Blodgett technique. Stacked monolayers of nano-folded GO exhibit high volumetric capacitance as a supercapactior electrode. Chapter 5 introduces plasma-treatment as a technique to modify the oxygen content of GO to induce high-rate pseudocapacitiance. Finally, Chapter 6 and 7 present future research ideas for periodic pulsing compression, nano-folded GO, and plasma-activated GO, as well as a synthesis of these findings in a broader context. dc.description.sponsorship Engineering and Applied Sciences - Engineering Sciences dc.format.mimetype application/pdf dc.language.iso en dash.license LAA dc.subject Engineering, Materials Science dc.title Graphene Oxide Langmuir-Blodgett Films for Capacitive Energy Storage dc.type Thesis or Dissertation dash.depositing.author Silverberg, Gregory John dc.date.available 2019-05-20T10:23:37Z thesis.degree.date 2017 thesis.degree.grantor Graduate School of Arts & Sciences thesis.degree.level Doctoral thesis.degree.name Doctor of Philosophy dc.contributor.committeeMember Bertoldi, Katia dc.contributor.committeeMember Spaepen, Frans dc.contributor.committeeMember Manoharan, Vinothan dc.type.material text thesis.degree.department Engineering and Applied Sciences - Engineering Sciences dash.identifier.vireo http://etds.lib.harvard.edu/gsas/admin/view/1583 dc.description.keywords graphene oxide; langmuir; wrinkling; capacitor dc.identifier.orcid 0000-0002-5413-2047 dash.author.email gjsilverberg@gmail.com
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