Graphene Strain Sensor with High Sensitivity
Date Issued
2015
Date
2015
Author(s)
Kuo, Shih-Chun
Abstract
In this work, bi-layer graphene is grown by CVD and then transferred to mobile phone protective film to produce single graphene film strain sensor. Later on, another graphene is transferred to mobile phone protective film to produce double graphene films strain sensor. The important variable, overlapping length of two graphene layers, is controlled by transferring process on micro precision stage. Graphene strain sensors are placed on a bendable substrate and a fixed displacement is applied on one edge of the substrate. The strain where sensors are placed and resistance are measured by strain gauge and digital multimeter separately. Based on measurement results, resistance and effective transmission length change when the strain is applied so the resistance gets larger by increasing the strain. The sensitivity of strain sensors is determined by gauge factor. In this work, the relationship between resistance and gage factor is monotonic. In addition, double-film strain sensors have higher sensitivity than single-film strain sensors do.
Subjects
graphene
strain
strain sensor
gauge factor
chemical vapor deposition
Type
thesis