Date of Award

12-8-2016

Document Type

Honors Thesis

Department

Physics

First Advisor

Lauber Martins

Second Advisor

Keong Yong

Third Advisor

Mike Wang

Abstract

Graphene's large fracture strain (>30%), chemical inertness, and piezoresistive nature make it well suited for use as a biocompatible strain sensor. A rectangular multilayer strucutre with graphene as its operative component was designed. It consists of a bottom layer of SU-8, a center layer of graphene, and a top layer of SU-8 and gold, with gold acting as the electrical contact. Kirigami-style patterning is applied via photolithography and oxygen plasma etching, allowing for a greater fracture strain. Additionally, the kirigami affects the stress concentraton in the graphene, affecting its piezoresistive gauge factor. The complete (patterned) structure exhibited a fracture strain of 40%, a 900% increase over unpatterned SU-8 of similar thickness.

Subject Area

Graphene; Strains and stresses

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Included in

Physics Commons

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