Conductivity Control of CVD Grown Graphene upon Various Analytes and its implications in UV Sensing

IBAÑEZ, FRANCISCO J.; DALFOVO, MARIA C.; FRANCIS P. ZAMBORINI

Indiana

Congreso; 246th ACS Meeting at Indianapolis; 2013

ACS

Graphene is raising tremendous scientific attention due to its interesting electronic,mechanical, and optical properties. Graphene is obtained by chemical vapor deposition (CVD) and transferred to a desired substrate. XPS data show no impurities from the Cu etching and cleaning procedures however, we encountered remaining PMMA from transferred graphene samples, which is difficult to be removed. In this work we will show the implications of polymers (PMMA), ozone (oxidized graphene), and organic-coated Au nanoparticles toward graphene conductivity and ultraviolet (UV) light detection by means of Raman, XPS, FT-IR, AFM, and cyclic voltammetry. We found that adding PMMA and applying O3 led to film current decrease while still being sensitive to UV. Raman showed severe loss of graphene structure after few minutes of O3 exposure however; the film remained sensitive to UV. The hybrid film demonstrated the potential ability of graphene to be used as an electrode for application in sensing and catalysis.