|Title||Surface Functionalized Graphene Biosensor on Sapphire for Cancer Cell Detection.|
|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||Joe, DJ, Hwang, J, Johnson, C, Cha, H-Y, Lee, J-W, Shen, X, Spencer, MG, Tiwari, S, and Kim, M|
|Journal||Journal of nanoscience and nanotechnology|
|Pagination||144 - 151|
Graphene has several unique physical, optical and electrical properties such as a two-dimensional (2D) planar structure, high optical transparency and high carrier mobility at room temperature. These make graphene interesting for electrical biosensing. Using a catalyst-free chemical vapor deposition (CVD) method, graphene film is grown on a sapphire substrate. There is a single or a few sheets as confirmed by Raman spectroscopy and atomic force microscopy (AFM). Electrical graphene biosensors are fabricated to detect large-sized biological analytes such as cancer cells. Human colorectal carcinoma cells are sensed by the resistance change of an active bio-functionalized graphene device as the cells are captured by the immobilized antibody surface. The functionalized sensors show an increase in resistance as large as ~20% of the baseline with a small number of adhered cells. This study suggests that the bio-functionalized electrical graphene sensors on sapphire, which is a highly transparent material, can potentially detect circulating tumor cells (CTCs) and monitor cellular electrical behavior while being compatible with fluorescence-based optical-detection bioassays.
|Short Title||Journal of nanoscience and nanotechnology|