UV-enhanced room-temperature gas sensing of ZnGa2O4 nanowires functionalized with Au catalyst nanoparticles
UV-enhanced room-temperature gas sensing of ZnGa2O4 nanowires functionalized with Au catalyst nanoparticles
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DOI：
10.1007/s00339-013-7745-9
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Sunghoon Park;Soyeon An;Youngho Mun;Chongmu Lee
中科院分区：
文献类型：
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作者：
Sunghoon Park;Soyeon An;Youngho Mun;Chongmu Lee
采用热蒸发法合成了ZnGa 2 O 4纳米线。扫描电子显微镜、透射电子显微镜和X-射线衍射表明，纳米线是直径为30- 200纳米的单晶，长度可达100 μm。研究了纳米尺度Au催化剂修饰的ZnGa 2 O 4纳米线传感器在室温和紫外光照射下对NO2气体的敏感特性。该传感器表现出显着增强的响应和大大减少的响应和恢复时间NO2气体在室温下，254 nm的紫外（UV）照射。在室温下，ZnGa 2 O 4纳米线对NO2气体的响应随紫外光强度从0增加到1.2mW/cm 2而从100%增加到861%。ZnGa 2 O 4纳米线对NO2气体响应的显著改善归因于通过光生电子-空穴对参与与NO2分子反应的电子数目的增加而增加的电阻变化。
ZnGa2O4nanowires were synthesized using a thermal evaporation technique. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction revealed that the nanowires were single crystals 30–200ánm in diameter and ranged up to ∼100áμm in length. The sensing properties of multiple networked ZnGa2O4nanowire sensors functionalized with Au catalyst nanoparticles with diameters of a few nanometers toward NO2gas at room temperature under UV irradiation were examined. The sensors showed a remarkably enhanced response and far reduced response and recovery times toward NO2gas at room temperature under 254ánm-ultraviolet (UV) illumination. The response of ZnGa2O4nanowires to NO2gas at room temperature increased from ∼100 to ∼861á% with increasing the UV intensity from 0 to 1.2ámW/cm2. The significant improvement in the response of ZnGa2O4nanowires to NO2gas by UV irradiation is attributed to the increased change in resistance due to the increase in the number of electrons participating in the reactions with NO2molecules by photo-generation of electron–hole pairs.