Preparation, Characterization Of Nano-semiconductor Cuprous Oxide, And Its Optical Property Study

Nano-semiconductor cuprous oxide (Cu2O) was widely used in chemical energy catalytic materials, degradation of environmental pollution organic catalytic materials, highly selective sensors sensitive materials, for its excellent photocatalytic properties. It is a hot research topic in the field of nano-science and heterogeneous catalysis at current. In this thesis, we describes electrodeposited cuprous oxide on the ITO glass electrode in copper acetate solution system. Systematic study has carried out by using cyclic voltammetry (CV), current-time curves (i-t), the open circuit potential-time curve (Ocp-t), scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-visible spectrum (UV-vis), to investigate nucleation and growth mechanism, morphology control, and the photoelectric effect of prepared ITO/Cu2O Nano-semiconductor materials. Some important results are described as follows:1. The conditions of ITO/Cu2O material preparation in solution of copper acetate system was investigated by CV. The resule show that electrodeposition should carry out at a lower potential to avoid the deposition of copper. The i-t date obtained at potentiostatic depositions were calculated and compared with the theoretical curve, it is proved that the electrodeposition process of Cu2O follows an instantaneous nucleation mode in the conditions. The SEM patterns show the nucleation density related to the deposition potential.2. Dendritic nanocrystals were deposited by voltage pulse deposited for the first time. The morphology and crystal structure were controlled in order to increase the surface area of Cu2O. Experiments were performed to study the effect of electrochemical parameters such as pulse duration, interval duration, and deposition potential on the dendritic growth and the detailed features. Compared to the previous works, a formation mechanism model of Cu2O dendritic nanostructures was proposed. It is hoped that this simple approach can generated more complex dendrite architectures. 3. Photoelectric effect and semiconductor type of Cu2O were investigated. The semiconductor type of Cu2O was transformed by adding surfactant polyethylene glycol (PEG). The experimental results show that the self-made dendritic Cu2O with high surface area have a narrow band gap and better optical properties in the ultraviolet-visible range.