Abstract
Metal oxide nanoparticles, such as CuO and SnO2, are outstanding systems for H2S gas sensing in air. In this work, those nanoparticles were deposited with different mixing percentages on substrates to form percolating networks of nanoparticles. Electrical electrodes were deposited on the nanoparticles’ films to investigate their gas sensing response against H2 and H2S, and their electrical characteristics. The sensor devices based on CuO–SnO2 nanoparticles revealed enhanced sensing characteristics against H2S with a sensitivity of 10 ppm. The enhanced sensing characteristics could be attributed to the formation of PN-junctions among CuO and SnO2 nanoparticles. The reasonable production cost (due to simple structure and cheap used materials), low power consumption ( ~ 1 µW for H2S at room temperature), high sensitivity, high response, and reasonable response time of the present sensors qualify them for practical implementation in portable gas sensing devices with enhanced characteristics.
Highlights
The recent developments in technology and industry lead to further emission of toxic gases that cause pollution to domestic environments
CuO nanoparticles were synthesized using a solvothermal method [12] with modification. 0.5 g of Cu(CH3COOH) was dissolved in 0.3 ml of acetic acid by sonication, mixed with 100 ml ethanol with a gradual increase of solution temperature to 80 °C. 10 ml of ethanol solution with 0.26 g of NaOH was added to the solution drop by drop under vigorous stirring
Hydrogen sulfide gas sensors were fabricated in this work using CuO and S nO2 nanoparticles
Summary
The recent developments in technology and industry lead to further emission of toxic gases that cause pollution to domestic environments. A conductometric gas sensor is a device that detects gaseous species in an environment by change in its electrical resistance [2, 3] This type of sensors is attractive for utilization in portable field applications due to its many advantages that include the simple fabrication process, compact size, and direct reading [4]. The uniform desperation of CuO with SnO2 nanoparticles is desirable since it allows the diffusion of H 2S gas to the sensing locations on the CuO–SnO2 PN-junctions. This investigation reports on the fabrication of H 2S gas sensors based on composite percolating films of CuO and SnO2 nanoparticles.
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