Water vapor detection with individual tin oxide nanowires
- 19 September 2007
- journal article
- Published by IOP Publishing in Nanotechnology
- Vol. 18 (42), 424016
- https://doi.org/10.1088/0957-4484/18/42/424016
Abstract
Individual tin oxide nanowires (NWs), contacted to platinum electrodes using focused ion beam assisted nanolithography, were used for detecting water vapor (1500-32 000 ppm) in different gaseous environments. Responses obtained in synthetic air (SA) and nitrogen atmospheres suggested differences in the sensing mechanism, which were related to changes in surface density of the adsorbed oxygen species in the two cases. A model describing the different behaviors has been proposed together with comparative evaluation of NW responses against sensors based on bulk tin oxide. The results obtained on ten individual devices (tested >6 times) revealed the interfering effect of water in the detection of carbon monoxide and illustrated the intrinsic potential of nanowire-based devices as humidity sensors. Investigations were made on sensitivity, recovery time and device stability as well as surface-humidity interactions. This is the first step towards fundamental understanding of single-crystalline one-dimensional (1D) tin oxide nanostructures for sensor applications, which could lead to integration in real devices.Keywords
This publication has 33 references indexed in Scilit:
- Plasma‐Assisted Modulation of Morphology and Composition in Tin Oxide Nanostructures for Sensing ApplicationsAdvanced Engineering Materials, 2007
- Metal and Metal Oxide Nanoparticles in Chemiresistors: Does the Nanoscale Matter?Small, 2005
- Metal oxide nano-crystals for gas sensingAnalytica Chimica Acta, 2005
- The surface and materials science of tin oxideProgress in Surface Science, 2005
- DRIFT studies of thick film un-doped and Pd-doped SnO2 sensors: temperature changes effect and CO detection mechanism in the presence of water vapourThin Solid Films, 2003
- Understanding the fundamental principles of metal oxide based gas sensors; the example of CO sensing with SnO2sensors in the presence of humidityJournal of Physics: Condensed Matter, 2003
- Infrared emission spectroscopic study of the adsorption of oxygen on gas sensors based on polycrystalline metal oxide filmsSensors and Actuators B: Chemical, 2001
- CO consumption of Pd doped SnO2 based sensorsThin Solid Films, 2001
- Influence of the Particle Size on the Surface Reactivity and Gas Sensing Properties of SnO2 NanopowdersMATERIALS TRANSACTIONS, 2001
- Ceramic sensors for humidity detection: the state-of-the-art and future developmentsSensors and Actuators B: Chemical, 1995