Production of sensitive gas sensors using CuO/SnO2 nanoparticles

Abstract

Metal oxide nanoparticles, such as CuO and SnO 2 , are outstanding systems for H 2 S 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 H 2 and H 2 S, and their electrical characteristics. The sensor devices based on CuO-SnO 2 nanoparticles revealed enhanced sensing characteristics against H 2 S with a sensitivity of 10 ppm. The enhanced sensing characteristics could be attributed to the formation of PN-junctions among CuO and SnO 2 nanoparticles. The reasonable production cost (due to simple structure and cheap used materials), low power consumption (~ 1 µW for H 2 S 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.

Nanostructured Metal Oxide-Based Acetone Gas Sensors: A Review

“…Among the different gas sensors, resistive-based gas sensors are highly popular due to simple operation principle, small size, high sensitivity, and low cost [44]. Resistive-based gas sensors sense a surrounding gas/gas mixture by changing its electrical resistance and often are fabricated from metal oxides [45]. Brattain and Bardeen first reported the modulation of Ge electrical properties in the presence of a gas [46].…”

Enhancing the Sensing Performance of Zigzag Graphene Nanoribbon to Detect NO, NO2, and NH3 Gases

“…Although there have been great benefits to humans as a result of the continuous developments in technology and industry, there have been serious effects on human health due to the release of hazardous radiation [23][24][25] and substances such as toxic gases [26,27] and volatile organic compounds [28,29]. The presence of some of these gases, even at low concentrations, is very dangerous to human life [30]. Monitoring the level of nitrogen-based gases such as NO, NO 2 , and NH 3 is of great interest for industry as well as medical applications.…”

GLAD Magnetron Sputtered Ultra-Thin Copper Oxide Films for Gas-Sensing Application

“…Generally, a gas sensor consists of gas-sensitive films and gas sensor substrate with electrodes, a package, and front-end electronic circuits. The gas-sensitive layer can be realized based on various materials, including organic compounds (e.g., phthalocyanines [2,3]) and metal oxides [4] (e.g., WO 3 [5,6], TiO 2 [7,8], SnO 2 [9,10], In 2 O 3 [11,12], Fe 2 O 3 [13,14], MoO 3 [13,15], ZnO [16][17][18], CuO [19][20][21][22][23][24][25][26][27][28]). The most common methods for metal oxide depositions are magnetron sputtering [29,30], sol-gel [31,32], thermal oxidation [33,34], hydrothermal techniques [35,36], the spray pyrolysis technique [37,38], and the microwave-assisted method [39,40].…”