Preparation Of WO₃Nanobelts And Their Photoelectric Characteristics

As the n type semiconductortransition metal oxides, WO3was widely usedin sensing, energy, environmental protection and other applications because ofthe unique gas detection, photoelectric conversion, catalyst performance. Inrecent years, One dimensional WO3nano structure materials are expected toconstructe the novel and efficient micro-nano optoelectronic devices, due to itsunique morphology and excellent physical and chemical characteristics.This paper mainly takes preparation of novel and efficient WO3photoelectric detector and photoelectric catalyst as research emphasis. First ofall, low-dimensional WO3nanostructures were successfully prepared byelectrospinning technology. Then the controllable preparation of high qualityWO3nanobelts were achieved through exploring and optimizing the processparameters WO3nanobelts. In order to further strengthen their performance,preparation of WO3mesoporous structure and composite materials had beenexplored and optimized and the photoelectric detection and photoelectrocatalysis characteristic had been analyzed. Based on the work in this paper, the mainresults are as follows:(1)WCl6/PVP precursor solution was prepared with tungsten hexachloride(WCl6) and polyvinylpyrrolidone (PVP) as raw materials and anhydrous ethanoland N,N-2methyl formamide as solvent. Then preparation of WCl6/PVPprecursor belts was successfully obtained through controlling the appliedvoltage. After curing and high-temperature pyrolysis process, high qualityone-dimensional WO3nanobelts were achieved controllable preparation.Photoelectric detection characteristic also shows that WO3nanobelt has the goodphotosensitivity and selectivity and has good stability and repeatability. Thelight dark current ratio reaches1000, which is more5times higher than ones ofphotodetector based on WO3nanomaterials so far; and the spectra responsivityand external quantum efficiency reach up to2.6×105A/W and8.1×107%,respectively equal to optimal value of the current international reports.(2) Using the Tea saponin (Tea-s) as foaming agent high purity WO3mesoporous nanobelts were successfully obtained by electrospinning technologycombined foaming agent and controllablly preparedby varing the Tea saponincontent in spinning solution. The optimum value of Tea-s content is14.5wt%.(3) Adding to g-C3N4in the precursor solution, high purity WO3/C3N4mesoporous nanobelts were successfully obtained by electrospinning technologycombined foaming agent. The experimental results showed thatphotoelectrocatalysis performance of WO3/C3N4mesoporous nanobelt obviously rises contrasting with that of pure WO3mesoporous nanobelt. Thephotoelectric detection performance improves more than3times.