Controlled remediation of defects for tuneable conductivity in reduced graphene oxide thin films

HERRERA, F. C.; CECILIA DOS SANTOS CLARO; GUSTAVO M. MORALES; LACCONI, G.; SANCHEZ, R. D.; FÉLIX GREGORIO REQUEJO; JOSE MARTIN RAMALLO LOPEZ

Berisso

Simposio; 1º Simposio Grafeno; 2015

Reduced graphene oxide (rGO) emerge as an alternative as oxygen functionalized graphene maintaining key properties as high surface area, mechanical resistance, thermal conductivity, biocompatibility and natural abundance. However, this material reveals only partial electronic properties evidencing low conductivity, typically five orders of magnitude lower than its parent graphene. We obtained homogeneous graphene oxide (GO) thin films by chemical exfoliation of GO flakes, deposited on silicon by Langmuir-Blodgett technique. They were defect remediated by thermal treatments in ultra-high-vacuum to produce homogeneous rGO thin films with tuneable and controlled conductive properties, reaching an intrinsic conductivity three orders of magnitude higher than the usually reported for rGO. Additionally, characterizations performed by Raman and XPS with nanometric spatial resolution allowed us to enlighten the origin of the reported unusual transport property, strongly correlated with structural and chemical characteristics, which potency even more the emerging fields of applications for GO.