氧化钨纳米材料的固相化学合成及性能

Solid-Stated Chemical Synthesis and Properties of Tungsten Oxide Nanomaterials

本文以廉价金属盐为原料,首次通过简便的室温固相化学反应合成前驱体,再通过热分解前驱体制备了三氧化钨纳米粉。利用X射线衍射仪(XRD)、能谱仪(EDS)、扫描电镜(SEM)测试手段,对三氧化钨的物相、组成及形貌等进行了表征,研究了三氧化钨纳米材料对有害气体的敏感特性及有机污染物的降解性能。结果表明:采用这种简单的合成方法得到了纯度高、结晶度好且粒径较小的三氧化钨纳米颗粒,该材料在较低的工作温度对低浓度丙酮气体就表现出了快响应、高选择性、高灵敏度的性能,在2s内可对5ppm丙酮气体产生响应,响应值达3.7,可用于早期糖尿病的检测。在紫外光和模拟太阳光条件下对亚甲基蓝溶液都有较好的降解性能,降解效率不低于70%。这种氧化钨纳米材料在新型多功能材料领域具有潜在的应用前景。

Tungsten oxide nanomaterials were synthesized by a simple and convenient two-step solidstate chemical reaction,in which some cheap metal salt was used as a raw material.The phase,composition and morphology of the products were characterized by XRD（X-ray diffraction）,EDS（Energy Dispensive spectrometer）,and SEM（Scanning electron microscope）.The characterizations indicated those tungsten oxides are of high purity,high crystallinity and nanosized materials.The gas sensing characteristics of the samples to harmful gases was studied,and meanwhile,the degradation properties for organic pollutant were also investigated.The results show that the as-prepared tungsten oxide nanomaterials has fast response,good selectivity and high sensitivity to acetone at low operation temperature.The response value of the sample reaches 3.7to 5ppm acetone within 2s,which could be used in early diabetes detection.The tungsten oxide nanomaterials also have high degradation efficiency to methylene blue under UV irradiate and simulated sunlight conditions,and both of degradation rate are not less than 70%.These tungsten oxide nanomaterials have potential applications in the field of multifunctional materials.