Reduced graphene oxide/2D colloidal array composite membrane fabricated layer-by-layer

Photonic crystal (PhC) presents unique optical properties and functionality, and are used widely as detectors, modulators, plasmonics and light generating devices. However, the low electrical conductivity and mechanical strength limit its applications. We introduced here a layer-by-layer composite membrane based on reduced graphene oxide (RGO) and two-dimensional (2D) colloidal crystal array (CCA). The 2D CCA was fabricated by an air/water interface deposition technique using polystyrene (PS) and polymethyl methacrylate (PMMA) colloidal particles. The composite membrane were characterized by SEM, Debye diffraction, reflectance spectra and electrical resistance measurement. The results indicated that layer-by-layer composite membrane have highly periodicity, and the monolayer of RGO and 2D CCA combined tightly. The Debye diffraction rings of the layer-by-layer heterostructure composite are the superimposition of the individual monolayers of 2D CCA. The reflection spectrum of the layer-by-layer heterostructure composite membrane showed that two peaks of reflection curve located in near ultraviolet region and visible region respectively, and the RGO sheet have no influence on the peak position and shape of reflection curve of the PhC. The RGO improved the electrical conductivity of the layer-by-layer heterostructure composite. The layer-by-layer heterostructure composite showed promising potential for the applications as sensors and optoelectronic devices.