State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics & Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, PR China.
Nanoscale. 2012 Nov 21;4(22):7078-83. doi: 10.1039/c2nr32078a.
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.
多孔氧化钨 (WO(3)) 纳米片通过一种简单、绿色的方法在环境温度下合成。以多晶水合钨酸 (H(2)WO(4)·H(2)O) 纳米粒子胶体为前驱体溶液，首先通过脉冲激光烧蚀钨靶在水中制备。H(2)WO(4)·H(2)O 纳米片在室温下陈化 72 小时生成。最后，通过在 800°C 下退火 4 小时合成多孔 WO(3)纳米片。考虑到多孔纳米片的大表面积与体积比，制备了多孔 WO(3)纳米片气体传感器，在低工作温度下，对 20 至 600 ppm 范围内的酒精浓度具有优异的传感器响应性能。这种高响应归因于高度结晶和多孔片状形态，其导致了有效吸附和解吸，并为气体分子反应提供了更多的活性位点。这些发现表明，多孔氧化钨纳米片在气体传感性能方面具有巨大潜力。
