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Photoluminescence and Raman studies of graphene thin films prepared by reduction of graphene oxide

2009; Elsevier BV; Volume: 64; Issue: 3 Linguagem: Inglês

10.1016/j.matlet.2009.11.029

1873-4979

Trần Việt Cường, Viet Hung Pham, Quang Trung Tran, Sung Hong Hahn, Jin Suk Chung, Eun Woo Shin, Eui Jung Kim,

Carbon Nanotubes in Composites

Photoluminescence (PL) and Raman studies have been performed to investigate the optical properties of graphene thin films prepared by chemical and thermal reductions of graphene oxide (GO). The G peak in Raman spectra red-shifted after reduction of GO. Thermal reduction resulted in a more red-shift of the G peak than chemical reduction. A strong intensity of the D peak indicated that the prepared graphene films have significant structural disorders. A blue-shifted emission in PL spectra suggested that sp2 clusters are embedded in a sp3 matrix that acts as a tunnel barrier, causing a strong fluctuation in the local band gap.