Aerosol-assisted CVD-grown WO₃ nanoneedles decorated with copper oxide nanoparticles for the selective and humidity-resilient detection of H₂S

ACS Applied Materials & Interfaces
Fatima E AnnanouchEduard Llobet

Abstract

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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Citations

Aug 1, 2015·ACS Applied Materials & Interfaces·Ashwini KumarShiv K Gupta
Feb 22, 2017·Sensors·Eduard LlobetChristelle Varenne
Dec 1, 2018·Nanoscale·Min Ling, Christopher S Blackman
Nov 26, 2019·Advanced Science·Weiyu ChenWeibo Cai
Mar 7, 2021·Nanomaterials·Milena TomićStella Vallejos
Mar 11, 2019·ACS Biomaterials Science & Engineering·Nishant Verma, Nikhil Kumar
Feb 26, 2020·ACS Applied Materials & Interfaces·Kaiping YuanDavid Wei Zhang
Jul 2, 2019·ACS Applied Materials & Interfaces·Xingyu XiaoYonghui Deng
Nov 27, 2020·ACS Applied Materials & Interfaces·Yu ZhangLihua Huo

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