材料科学
纳米材料
纳米颗粒
化学气相沉积
纳米技术
硫化铜
异质结
制作
氧化物
硫化氢
化学工程
铜
光电子学
硫黄
医学
替代医学
病理
工程类
冶金
作者
Fatima Ezahra Annanouch,Z. Haddi,Stella Vallejos,Polona Umek,Peter Guttmann,Carla Bittencourt,Eduard Llobet
标识
DOI:10.1021/acsami.5b00411
摘要
A gas-sensitive hybrid material consisting of Cu2O nanoparticle-decorated WO3 nanoneedles is successfully grown for the first time in a single step via aerosol-assisted chemical vapor deposition. Morphological, structural, and composition analyses show that our method is effective for growing single-crystalline, n-type WO3 nanoneedles decorated with p-type Cu2O nanoparticles at moderate temperatures (i.e., 380 °C), with cost effectiveness and short fabrication times, directly onto microhot plate transducer arrays with the view of obtaining gas sensors. The gas-sensing studies performed show that this hybrid nanomaterial has excellent sensitivity and selectivity to hydrogen sulfide (7-fold increase in response compared with that of pristine WO3 nanoneedles) and a low detection limit (below 300 ppb of H2S), together with unprecedented fast response times (2 s) and high immunity to changes in the background humidity. These superior properties arise because of the multiple p–n heterojunctions created at the nanoscale in our hybrid nanomaterial.
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