Rapid and ultrahigh ethanol sensing based on Au-coated ZnO nanorods
- 11 December 2007
- journal article
- Published by IOP Publishing in Nanotechnology
- Vol. 19 (3), 035501
- https://doi.org/10.1088/0957-4484/19/03/035501
Abstract
Rapid and ultrahigh sensing is realized from Au-coated ZnO rods with diameters down to 15 nm. Both the small diameters and the Au coating make the surface-depletion effect more pronounced for gas sensing. Such enhanced surface depletion increases the sensitivity, lowers the operation temperature and decreases the response time. A sensitivity of 89.5-100 ppm ethanol is obtained with response time shorter than 2 s at 300 °C, and the operation temperature can be as low as 150 °C. It is found that the Au coating improves the sensitivity by three times; this is much higher than that of noble metal-doped metal oxide sensors controlled by a grain-boundary barrier. Our results imply that the surface-depletion model is very helpful in fabricating high performance gas sensors.Keywords
This publication has 17 references indexed in Scilit:
- Surface-depletion controlled gas sensing of ZnO nanorods grown at room temperatureApplied Physics Letters, 2007
- Enhanced NO2 selectivity of hybrid poly(3-hexylthiophene): ZnO-nanowire thin filmsApplied Physics Letters, 2007
- Room temperature gas sensitivity of ultrathin SnO2 films prepared from Langmuir-Blodgett film precursorsApplied Physics Letters, 2006
- Rapid synthesis of ZnO nano-rods by one-step, room-temperature, solid-state reaction and their gas-sensing propertiesNanotechnology, 2006
- Unprecedented ultra-high hydrogen gas sensitivity in undoped titania nanotubesNanotechnology, 2005
- Contact-controlled sensing properties of flowerlike ZnO nanostructuresApplied Physics Letters, 2005
- Direct formation of highly porous gas-sensing films by in situ thermophoretic deposition of flame-made Pt/SnO2 nanoparticlesSensors and Actuators B: Chemical, 2005
- Sensing properties of Au-loaded SnO2–Co3O4 composites to CO and H2Sensors and Actuators B: Chemical, 2005
- Functionalized Carbon Nanotubes for Molecular Hydrogen SensorsAdvanced Materials, 2001
- Transition between neck-controlled and grain-boundary-controlled sensitivity of metal-oxide gas sensorsSensors and Actuators B: Chemical, 1995