Study of GO-Cu 2 O and RGO-Cu nanocomposite monolayer sheets prepared by modified Langmuir Blodgett route
2018
Abstract The modified Langmuir-Blodgett (MLB) technique has been improvised and extended to transfer GO-Cu 2 O nanocomposite monolayer sheets, by introducing Cu 2+ ions into the subphase at room temperature. Morphological studies of as-transferred sheets revealed the presence of closely spaced GO monolayer sheets, with slightly enhanced roughness. XPS studies of as-transferred sheets confirmed the presence of copper, either as metallic Cu or Cu 2 O, along with significant Cu(OH) 2 component, but TEM results confirmed the formation of Cu 2 O nanocrystallites of size (7 ± 2) nm, distributed uniformly over GO sheets. After heat treatment in vacuum at 400 °C, the nanocomposite sheets were covered with a uniform distribution of larger size nanoparticles. Based on Raman, XPS and TEM studies it has been confirmed that heat treatment at 400 °C in vacuum results in the formation of agglomerated Cu nanoparticles of size (23 ± 9) nm distributed uniformly over reduced graphene oxide (RGO) sheets. The electrical characterization of nanocomposite sheets on SiO 2 /Si in back-gated FET geometry revealed that the electrical conductivity of as-transferred GO-Cu 2 O sheets was similar to that usually observed for GO monolayer sheets. The RGO-Cu sheets also displayed electrical conductivity and field effect mobility values comparable to those reported for RGO sheets obtained by chemical/thermal reduction, and was unaffected by the presence of Cu nanoparticles.
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