Investigation On The Preparation And Properties Of CuSCN And Cu₂O Nano Structure Films

Cuprous thiocyanate (CuSCN), with a wide band gap of 3.6eV, is an intrinsic p-type semiconductor owning a high transmittance in the visible light region. Cuprous oxide (Cu2O), a natural p-type semiconductor with a direct band gap of 2.17eV, possesses a high absorption coefficient in the visible light region. CuSCN and Cu2O are both Cu based semiconductors, having shown great potential in solar cells, heterojunction, photocatalysis and gas sensor applications due to the non-toxic, low-cost and abundant storage. However, it is still a challenge to fabricate the large area uniform p-CuSCN and Cu2O nano-film using a simple, low-cost and reliable method.In this work, the CuSCN nanoparticles films and Cu2O nanowire network films were prepared by in situ systhesis at Solid-Liquid interface. And their optical, magnetic, photoluminescence properties have been initial investigated. The main content of this thesis are listed as following:1、CuSCN nanoparticles films were fabricated by immersing the Cu films prepared by thermal evaporation in a solution of thiocyanate. Different types of thiocyanate, reaction time and temperature were studied to show their effects on the morphology of the CuSCN films. The optical property of the CuSCN films was investigated.2、A strange chameleon phenomenon was discovered in the progress of the formation of CuSCN, then we designed experiments and explained the reason of this phenomenon. An island growth mechanism of CuSCN nanoparticles films was confirmed.3、Fluorescence quenching effect was discovered at the interaction of CuSCN and CV(Crystal Violet), Subsequently, this effect was studied with Raman spectroscopy in detail. A rational explanation was proposed.4、Cu2O nanowire network films were fabricated by immersing the CuSCN nanoparticles film in a solution of NaOH. The concentration of NaOH was studied to show its effect on the morphology of the Cu2O nanowire. The photocurrent of Cu2O nanowire films were measured for the further investigation of the application of Cu2O nanowires network based photoelectric devices.5、Large amount of Cu2O nanowires were synthesized through the reaction between commercial CuSCN powders and NaOH. The process parameters were optimized. The photoluminescence, thermal stability and magnetic properties were investigated.