| Micro/nano science and technology has been developing rapidly, due to its excellent physical and chemical properties. However, the micro/nano technology is still on the primary stage. So the scientist should further study micro/nano technology and materials, to obtain desired products. With attaching importance to environment, many preparation technologies need to be redesigned and many raw materials should be searched by scientists.Copper containing micro/nano materials, as the indispensable member of micro/nano materials family, have an important effect on the industrial development. In this study, copper containing micro/nano materials were prepared by the green, facile and eco-friendly liquid-reduction process. The effects of time, temperature and pH on the formation of micro/nanocrystallites were investigated. The possible growth process and mechanism of crystal were proposed. The biomedical and electrochemical properties of as-products were also explored. The result of performance study revealed that the prepared crystallites can be a promising candidate for wide range of bio-medical and photoelectrochemical applications.The research contents in this paper are as follows:(1) Truncated octahedral cuprous oxide(Cu2O) crystallites with highly uniform morphologies and sizes ranging from 2.4~2.5 μ m were prepared by using a green and convenient approach and their antibacterial activities were studied. They were obtained through the chemical reduction of copper chloride by glucose in the presence of sodium hydroxide and polyethylene glycol at room temperature for 2 hours. X-ray powder diffraction(XRD), Energy Dispersive Spectrometer(EDS), scanning electron microscopy(SEM), and transmission electron microscopy(TEM) as well as high-resolution transmission electron microscopy(HRTEM) were used to characterize the obtained products. Structural analysis revealed that these truncated octahedral crystallites were composed of eight {111} faces and six {200} faces. The effects of time, temperature and polyethylene glycol on the formation of truncated octahedral cuprous oxide were investigated. The possible growth process and mechanism of truncated octahedral cuprous oxide were proposed. The antibacterial activities of truncated octahedral Cu2 O were also explored, they exhibited significant antimicrobial activity against both Gram-negative and Gram-positive bacteria. The result of antibacterial study revealed that the prepared Cu2 O can be a promising candidate for wide range of bio-medical applications.(2) We studied photoelectrochemical properties by using the obtained truncated octahedral cuprous oxide(Cu2O) crystallites in the last chapter. The ultraviolet-visible absorption of Cu2 O with its energy band width was explored by ultraviolet-visible spectrophotometer. The electrochemical properties were taken on a CHI 760 e electrochemical workstation. Cyclic voltammetry(CV), electrochemical hydrogen evolution reaction(HER), the transient photocurrent response(I-t), open circuit potential-time(OCPT) and electrochemical impedance spectroscopy(EIS) were measured. The study provided abundant theoretical foundation for Cu2 O application in electrochemical industries.(3) In this chapter, Cu-Ag bimetallic nanocrystallites were prepared by using a green and convenient approach. In this experiment, ascorbic acid(working as a reducing agent) reduced cupric acetate monohydrate(Cu(CH3COO)2·H2O) and silver nitrate(AgNO3) to Cu-Ag bimetallic particles. X-ray powder diffraction(XRD), field emission scanning electron microscopy(FESEM), energy dispersive spectrometer(EDS) and X-ray photoelectron spectroscopy(XPS) were used to characterize the as-obtained products. The electrochemical properties of Cu-Ag nanocyrstallites were also explored. The results revealed that the as-prepared Cu-Ag could be a promising candidate for wide range of electrochemical applications.Copper containing materials prepared by a green and environmental friendly route at room temperature provided a good way to the preparation of copper and nonmetal, copper and metal compounds. And studies on antibacterial and electrochemical properties of micro/nano copper containing proved that copper containing materials have a great prospect of industrial development. |
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