Formaldehyde detection with chemical gas sensors based on WO3 nanowires decorated with metal nanoparticles under dark conditions and UV light irradiation

SENSORS AND ACTUATORS B-CHEMICAL

卷:320

Article

Bouchikhi, Benachir¹  Chludzinski, Tomasz²  Saidi, Tarik¹  Smulko, Janusz²  El Bari, Nezha³  Wen, He⁴  Ionescu, Radu⁵ 

[1] Moulay Ismail Univ Meknes, Fac Sci, Dept Phys, Sensor Elect & Instrumentat Grp, BP 11201, Zitoune 11201, Meknes, Morocco

[2] Gdansk Univ Technol, Fac Elect Telecommun & Informat, Gdansk, Poland

[3] Moulay Ismail Univ Meknes, Fac Sci, Dept Biol, Biotechnol Agroalimentary & Biomed Anal Grp, BP 11201, Zitoune 11201, Meknes, Morocco

[4] Hunan Univ, Coll Elect & Informat Engn, Changsha, Peoples R China

[5] Uppsala Univ, Dept Solid State Phys, Angstrom Lab, S-75121 Uppsala, Sweden

关键词: WO3 nanowires gas sensors;    Metal nanoparticles doping;    UV light irradiation;    Formaldehyde detection;   

DOI  :  10.1016/j.snb.2020.128331

来源: Elsevier

【 摘 要 】

We report results of formaldehyde gas (CH2O) detection under dark conditions and UV light irradiation with pristine tungsten trioxide nanowires (WO3 NWs) and metal nanoparticles decorated WO3 NWs gas sensing layers. The resistive layers were deposited by one step aerosol assisted chemical vapor deposition (AACVD) on commercial alumina substrates with 10-pair interdigitated platinum electrodes. The elaborated gas sensors, based on pristine WO3 and on WO3 decorated with Au, Pt, Au/Pt, Ni and Fe nanoparticles, were investigated towards three concentrations of formaldehyde gas (5, 10 and 15 ppm) under dark conditions and under UV light irradiation at the wavelength of 394 nm. Two main effects were observed: firstly, under UV light irradiation the response time for CH2O desorption was significantly reduced with the exception of the nanomaterial with Fe NPs dopant; secondly, the gas induced baseline shift was reduced under UV light irradiation conditions. These results can be explained by the additional energy induced by the UV light, accelerating the adsorption-desorption processes. The results obtained confirmed that both the decoration of WO3 NWs with selected metal nano particles as well as sensors operation under UV light irradiation are a practical and affordable way to enhance gas sensing towards formaldehyde detection, although both strategies applied together did not introduce an amplified synergetic effect.

【 授权许可】

Free