The Effect of Fe(Ⅲ) Doping on Structure and Gas Sensing Properties of Ultrathin W18O49 Nanowires
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摘要: 针对纯氧化钨纳米材料丙酮传感器存在灵敏度低、选择性差、检测温度高等问题，通过简单的溶剂热法制备Fe掺杂氧化钨(Fe-W18O49)超细纳米线，优化氧化钨材料对丙酮的敏感性能. 结果表明：Fe(Ⅲ)的掺杂不仅抑制了W18O49晶相向WO3晶相的转化，起到了稳定W18O49晶相的作用，而且优化了其气敏性能. 当掺杂比n(Fe)/n(W)为0.10时，其气敏性能最佳. 该材料在最佳工作温度(220 ℃)下对丙酮(体积分数为5×10-5)的灵敏度达11.4，响应/恢复时间为14/16 s，并且对丙酮有很好的选择性.Abstract: Fe(Ⅲ)-doped ultrathin tungsten oxide (Fe-W18O49) nanowires were prepared with the simple solvent-thermal method to optimize the acetone-sensing performance of tungsten oxide acetone sensor materials for reason of the low response, poor selectivity and high detection temperature of pure tungsten oxide. The results showed that Fe(Ⅲ) doping not only inhibited the transformation of W18O49 crystal phase to WO3 crystal phase but also optimized its gas-sensing performance. The W18O49 nanowires with doping ratio (n(Fe)/n(W)) of 0.10 demonstrated the best performance. This material showed a sensitivity of 11.4 for acetone with a volume fraction of 5×10-5 at the optimum operating temperature of 220 ℃, with the response/recovery time of 14/16 s and good selectivity.
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Key words:
- tungsten oxide /
- Fe(Ⅲ) doping /
- ultrathin nanowires /
- gas sensing properties /
- acetone
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图 2 Fe(Ⅲ)掺杂氧化钨的EDS能谱
注：n(Fe)/n(W)=0.10.
Figure 2. The EDS spectrum of Fe(Ⅲ)-doped tungsten oxide
图 3 不同Fe-W18O49样品的XRD图谱
注：曲线a~e分别为n(Fe)/n(W)=0、0.05、0.10、0.15、0.20条件下制备的Fe-W18O49样品.
Figure 3. The XRD pattern of different Fe-W18O49 samples
图 4 Fe-W18O49的TEM与SEM图
注：n(Fe)/n(W)=0.10.
Figure 4. The TEM and SEM images of Fe-W18O49
图 7 不同工作温度下气敏材料对丙酮的灵敏度
注: 丙酮的体积分数为5×10-5.
Figure 7. The sensitivity of the gas sensing materials to acetone at different working temperatures
图 8 气敏材料对不同体积分数丙酮的灵敏度曲线
Figure 8. The sensitivity of the gas sensing materials to acetone of different volume fractions
图 10 气敏材料的动态循环性能及稳定性
Figure 10. The dynamic cycling performance and stability of gas sensing materials
表 1 EDS分析不同样品中O、W和Fe的物质的量分数
Table 1. The mole fraction of O, W and Fe in different samples under EDS analysis
n(Fe)/n(W) x(O)/% x(W)/% x(Fe)/% 0.05 74.78 24.71 0.51 0.10 74.57 24.57 0.87 0.15 74.51 24.51 0.97 0.20 73.91 23.91 2.17 
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