Low-temperature prototype hydrogen sensors using Pd-decorated SnO2 nanowires for exhaled breath applications

作者：Kien Nguyen; Chu Manh Hung^*; Trinh Minh Ngoc; Dang Thi Thanh Le; Duc Hoa Nguyen; Duy Nguyen Van; Hieu Nguyen Van^*

来源：Sensors and Actuators B: Chemical , 2017, 253: 156-163.

DOI：10.1016/j.snb.2017.06.141

• SnO2 nanowires
• Hydrogen sensor
• Breath gas analysis
• Pd nanoparticles

The synthesis and integration of a compact, highly sensitive, and inexpensive gas sensor for breath analysis have attracted considerable attention because of painless application, non-invasiveness, and ability to diagnose diseases during early stages. In this study, we introduced the on-chip growth of SnO2 nanowire (NW)-based gas sensor to analyze the low concentration of H-2 gas for exhaled breath applications. We decorated the Pd catalyst on the surface of SnO2 NWs to enhance gas-sensing performance. Comparative results revealed that Pd decoration enhanced the H-2 gas response at low operating temperature range (250-300 degrees C). Moreover, the Pd-decorated SnO2 NW sensor exhibited good response to H-2 gas at considerably low temperature of 150 degrees C, whereas the bare SnO2 NWs cannot respond. Finally, the packaged sensor was tested at different supplied powers to various H-2 concentrations ranging from 10 to 100 ppm. Gas selectivity toward CO2 and ethanol gases was examined. Results demonstrated that the prepared gas sensor package is suitable for breath gas analysis.

• 出版日期2017-12
• 单位华中科技大学