Porous tungsten oxide nanoflakes for highly alcohol sensitive performance.
Porous tungsten oxide nanoflakes for highly alcohol sensitive performance.
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DOI：
10.1039/c2nr32078a
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发表时间：
2012-10
期刊：
影响因子：
6.7
通讯作者：
J. Xiao;P. Liu;Y. Liang;H. Li;G. Yang
中科院分区：
文献类型：
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作者：
J. Xiao;P. Liu;Y. Liang;H. Li;G. Yang
用一种简单、绿色的方法在常温下合成了多孔氧化钨(WO(3))纳米片。以脉冲激光烧蚀水中的钨靶为前驱体，首次制备了多晶水合钨铁矿(H(2)WO(4)·H(2)O)纳米胶体。H(2)WO(4)·H(2)O纳米粒子在室温下经72h陈化处理后得到H(2)WO(4).最后，采用800°C热处理4h的方法制备了多孔纳米WO(3)气敏元件，考虑到多孔WO(3)气敏元件具有较大的比表面积，在较低的工作温度下，该气敏元件在20~600ppm的乙醇浓度范围内表现出了良好的气敏特性。这种高的响应归因于高度结晶和多孔的片状形貌，这导致了有效的吸附和解吸，并为气体分子的反应提供了更多的活性中心。这些发现表明，多孔氧化钨纳米片在气敏性能方面具有很大的潜力。
Porous tungsten oxide (WO(3)) nanoflakes have been synthesized by a simple and green approach in an ambient environment. As a precursor solution a polycrystalline hydrated tungstite (H(2)WO(4)·H(2)O) nanoparticles colloid was first prepared by pulsed-laser ablation of a tungsten target in water. The H(2)WO(4)·H(2)O nanoflakes were produced by 72 h aging treatment at room temperature. Finally, porous WO(3) nanoflakes were synthesized by annealing at 800 °C for 4 h. Considering the large surface-to-volume ratio of porous nanoflakes, a porous WO(3) nanoflake gas sensor was fabricated, which exhibits an excellent sensor response performance to alcohol concentrations in the range of 20 to 600 ppm under low working temperature. This high response was attributed to the highly crystalline and porous flake-like morphology, which leads to effective adsorption and desorption, and provides more active sites for the gas molecules' reaction. These findings showed that the porous tungsten oxide nanoflake has great potential in gas-sensing performance.