Synthesis Of ZnO Semiconductor Composites And Study On The Visible-light Photochrominsm

In recent years, photochromic materials have won particular attention due to their potential application in some highly technological fields, such as information displays,chemical sensors, modified electrodes and holographic storage device. Heteropoly acid was introduced into composite system construction pole or organic material or system. This material or system has a good performance in response to ultraviolet region. Through introduct the POMs into semiconductor materials could expand the light response range from ultraviolet region to visible light region, so as to realize the use of visible light. The band gap of Zinc Oxide is 3.37 e V at room temperature. The Zinc Oxide has strong luminescence properties of electron transition.In this paper, the photochromic of Zn O/PMo A composite materials under visible light irradiation was researched. The main content are as follows:1. The Zn O nanomaterials were fabricated through roasting method, using zinc acetate and lithium hydroxide as raw materials.The Zn O nanorods crystals with many stacked together, the whole size of which was in the range of 100 nm. After doped PMo A, the color of composite materials turns to blue from light yellow after visible light irradiated. The color changing was due to Mo6+â†'Mo5+ intervalence charge transfer.2. The Zn O nanotubes were fabricated through hydrothermal method, using zinc acetate as raw materials. The Zn O nanotubes crystals with many stacked together, the whole size of which was in the range of 500nm-1300 nm and thickness was about150nm-300 nm, vertically stood on the surface of substrates. After doped PMo A, the color of composite materials turns to blue from light yellow after visible light irradiated. A new Zn-O-Mo bond was formed between the Zn O nanotubes and PMo A.The color changing was due to Mo6+â†'Mo5+ intervalence charge transfer.3. The Zn O nanofibers were fabricated through hydrothermal method, using zinc acetate as raw materials, Polyvinylpyrrolidone(Pv P) as the dissolvant. The whole size of nanofibers was in the range of 100nm-300 nm. After doped PMo A, the color ofcomposite materials turns to blue from light yellow after visible light irradiated. The color changing was due to Mo6+â†'Mo5+ intervalence charge transfer.