Abstract
A new gold (Au) nanoparticle (NP)/tungsten trioxide (WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> )-based chemoresistive formaldehyde gas sensor is fabricated and reported. The WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> thin film and Au NPs are prepared by radio frequency (RF) sputtering and rapid thermal evaporation (RTE) approaches, respectively. The utilized Au NPs successfully elevate the surface area/volume ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${S}_{A}/{V}$ </tex-math></inline-formula> ) ratio and improve corresponding sensing performance. Experimentally, the proposed Au NP/WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> sensor shows a very high sensing response of 1303.5 and a response (recovery) time of 16 s (16 s) under introduced 20 ppm formaldehyde (HCHO)/air gas at 225 °C. This value is remarkably higher than those of previous reports. In addition, a very low detection content of 40 ppb HCHO/air is obtained, revealing that a widespread detection range of formaldehyde concentration can be acquired for the proposed sensor. To expand the application ability in wireless sensing, a gray algorithm GM(1, 1) model incorporating the first-order differential approach is used to substantially diminish the transmission data, increase the transmission efficiency, and improve the accuracy of the response data. The formaldehyde sensor in this study exhibits advantages including a simple structure, ease of manufacturing, relatively lower cost, practical smart sensing ability, and wireless transmission applications.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
