Abstract
The CuO-functionalized SnO2 nanowire (NW) sensors were fabricated by depositing a slurry containing SnO2 NWs on a polydimethylsiloxane (PDMS)-guided substrate and subsequently dropping Cu nitrate aqueous solution. The CuO coating increased the gas responses to 20 ppm H2S up to ∼74-fold. The Ra/Rg value of the CuO-doped SnO2 NWs to 20 ppm H2S was as high as 809 at 300 °C, while the cross-gas responses to 5 ppm NO2, 100 ppm CO, 200 ppm C2H5OH, and 100 ppm C3H8 were negligibly low (1.5-4.0). Moreover, the 90% response times to H2S were as short as 1-2 s at 300-400 °C. The selective detection of H2S and enhancement of the gas response were attributed to the uniform distribution of the sensitizer (CuO) on the surface of the less agglomerated network of the SnO2 NWs.
Original language | English |
---|---|
Pages (from-to) | 105-110 |
Number of pages | 6 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 142 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2009 Oct 12 |
Bibliographical note
Funding Information:This work was supported by the IT R&D program of MKE/IITA [2006-S-078-03, Environmental Sensing and Alerting System with Nano-Wire and Nano-tube], the Korea Science and Engineering Foundation (KOSEF) NRL program (No. R0A-2008-000-20032-0) and the Fundamental R&D Program for Core Technology of Materials (M2008010013).
Keywords
- CuO-SnO
- Gas sensors
- HS detection
- Selectivity
- SnO nanowires
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry