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University of Notre Dame

1. Sachidananda Krishnamurthy. Graphene Based Assemblies: Electron Transfer Processes and Energy Conversion Applications</h1>.

Degree: PhD, Chemistry and Biochemistry, 2014, University of Notre Dame

Nanomaterials with their unique properties allow for attractive applications in devices. Composite assemblage of nanomaterials offers great prospects of multiple functional components to be combined. Hence one of the major directions of research in the area of materials science is the fundamental understanding of the interaction between different nanomaterials and their nearby molecular species. Carbon-based materials exist in all dimensions, zero (fullerenes), one (carbon nanotubes), two (graphene) and three (graphite) dimensions and are very well-known for their versatility in various studies. Of all the carbon- based materials, graphene stands on the top of the list to provide various multifunctional materials. As a result, they are employed in various applications in nanoelectronics, polymer composites, hydrogen production and storage, intercalation materials, drug delivery, sensing, catalysis, photovoltaics etc. Graphene possesses several interesting properties such as remarkably high surface area, electrical conductivity and mechanical strength, interesting electrochemical behavior and importantly is also naturally abundant. In particular chemical methods for the synthesis of graphene-like material called graphitic oxide or graphene oxide (GO), offer economical and easy routes. All these advantageous properties allow for the use of graphene-based mats in designing tailored composite materials. GO-semiconductor or GO-metal nanoparticle composites have the potential to function as efficient, multifunctional materials for solar energy conversion and storage, selective detection and destruction of trace environmental contaminants or achieve single-substrate, multistep heterogeneous catalysis. In this dissertation, I aim to understand the various electron transfer reactions between methyl viologen molecules, semiconductor and metal nanoparticles with GO. In the first chapter, the electron transfer from photochemically generated methyl viologen radicals with graphene oxide (GO) is studied. This charge transfer interaction results in the reduction of GO to reduced graphene oxide (RGO) as well as storage of electrons in the carbon network. The stored electrons can be utilized to reduce Ag+ ions and thus anchor silver nanoparticles onto the RGO platform. The spectroscopic experiments allow the elucidation of quantitative electron transfer into GO and the growth mechanism of silver nanoparticle growth as well as the estimation of apparent Fermi level of GO. Transmission electron microscopy highlights the RGO-Ag structure and the potential of designing metal-RGO assemblies. In the following chapters the electron transfer from photoirradiated semiconductors (ZnO and TiO2) nanoparticles to GO sheets suspended in ethanol is studied. Photoexcited ZnO and TiO2 particles are capable of transferring electrons to GO readily. The semiconductor-RGO composites are further decorated with Ag nanoparticles by reducing Ag+ ions quantitatively with excess electrons stored in RGO. Further the galvanic exchange… Advisors/Committee Members: Marya Lieberman, Committee Member, Franklyn Tao, Committee Member, Slavi Sevov, Committee Member.

Subjects/Keywords: photocatalysis; metal nanoparticles; semiconductors; quantum dots; energy conversion; graphene

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APA (6th Edition):

Krishnamurthy, S. (2014). Graphene Based Assemblies: Electron Transfer Processes and Energy Conversion Applications</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/sx61dj55b25

Chicago Manual of Style (16th Edition):

Krishnamurthy, Sachidananda. “Graphene Based Assemblies: Electron Transfer Processes and Energy Conversion Applications</h1>.” 2014. Doctoral Dissertation, University of Notre Dame. Accessed June 16, 2019. https://curate.nd.edu/show/sx61dj55b25.

MLA Handbook (7th Edition):

Krishnamurthy, Sachidananda. “Graphene Based Assemblies: Electron Transfer Processes and Energy Conversion Applications</h1>.” 2014. Web. 16 Jun 2019.

Vancouver:

Krishnamurthy S. Graphene Based Assemblies: Electron Transfer Processes and Energy Conversion Applications</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2014. [cited 2019 Jun 16]. Available from: https://curate.nd.edu/show/sx61dj55b25.

Council of Science Editors:

Krishnamurthy S. Graphene Based Assemblies: Electron Transfer Processes and Energy Conversion Applications</h1>. [Doctoral Dissertation]. University of Notre Dame; 2014. Available from: https://curate.nd.edu/show/sx61dj55b25

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