We investigate the effect of the chemical and physical defects on the humidity sensitivity of graphene. For this we apply reactive ion etching for physical defects and the poly(methyl methacrylate) (PMMA) coating for chemical defects to the CVD graphene. The tendency of humidity sensing is hardly found by the physical defects while the distinct changes are observed with chemical defects by control of the thickness and the coverage area of the PMMA on the graphene surface. The graphenes covered with thinner or smaller area of PMMA show an enhanced humidity sensitivity, indicating the possibility of H2O sensing.
Bibliographical noteFunding Information:
This work was supported by Center for Advanced Soft Electronics , ERC project ( 2016R1A5A1010148 ) and Basic Science Research Program funded by the Korea government (MSIP) ( 2015R1A2A2A01004751 , 2015R1A2A1A01005931 ).
© 2017 Elsevier B.V.
- Humidity sensing
- Poly(methyl methacrylate)
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry