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Synthesizing High-Quality Graphene M...

Singha Roy, Susmit.

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Synthesizing High-Quality Graphene Membranes for Engineering Diffusion Barriers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesizing High-Quality Graphene Membranes for Engineering Diffusion Barriers./
Author:	Singha Roy, Susmit.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	181 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.
Contained By:	Dissertation Abstracts International77-11B(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10134215
ISBN:	9781339927107

Synthesizing High-Quality Graphene Membranes for Engineering Diffusion Barriers.
Singha Roy, Susmit.

Synthesizing High-Quality Graphene Membranes for Engineering Diffusion Barriers. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 181 p.

Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2015.

We demonstrate significant advances in the fundamental understanding and engineering of scalable graphene diffusion barriers. Experimental studies have established that defect-free non-scalable graphene is an excellent barrier material, however its scalable counterparts are still well behind in terms of performance. The latter's ability to perform as a barrier membrane is compromised primarily by the presence of three major problems - high density of defects, self-degradation in ambient environment and induced electrochemical oxidation of the underlying material. First, we develop an in-depth understanding of how diffusion occurs through monolayer graphene grown via chemical vapor deposition. It is shown that the atomic membrane is impenetrable in the pristine regions, however it is easily penetrated by oxygen and water at grain boundaries and intrinsic pinholes. Second, we study in detail the self-deterioration of graphene in ambient and quantify the evolution, kinetics, and energetics of the degradation process both in the pristine and intrinsically defective regions of graphene. It is also found that the degradation process is accelerated in the presence of water vapor. Third, we find that the overall defect density of a graphene membrane is primarily determined by the density of its intrinsic pinholes and grain boundaries. We demonstrate that the density on intrinsic pinholes can be significantly reduced by reducing the surface roughness of the growth substrate which is achieved by regulating the pre-growth annealing time and temperature. The density of the grain boundaries can be altered by varying the internucleation distance during the growth of the membrane. Fourth, when graphene is used as a corrosion barrier for metals, we establish that the electrochemical corrosion of the metal can be drastically reduced by adding an ultra-thin electrically insulating layer between the graphene and the metal. In addition, the barrier performance is enhanced greatly by stacking more layers of graphene top of the first layer. Finally, we combine all the results and knowledge from these previous studies to design the best performing scalable graphene barrier until date. We expect this study to serve as a foundation for engineering next-generation graphene barriers with performance comparable to its pristine and theoretical counterparts.

ISBN: 9781339927107Subjects--Topical Terms:

543314
Materials science.

Synthesizing High-Quality Graphene Membranes for Engineering Diffusion Barriers.
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