Highly sensitive humidity sensor based on amorphous Al2O3nanotubes
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- 3 December 2010
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 21 (6), 1907-1912
- https://doi.org/10.1039/c0jm02753g
Abstract
Amorphous Al2O3 nanotubes were obtained by the transformation of NH4Al(OH)2CO3 nanotubes annealed at 600 °C. The tube-like nanostructures not only increase efficient sites for gas adsorption, but also promote the dissociation of water absorbed onto the surfaces of the nanotube walls. Moreover, they also provide effective and fast channels for vapor and liquid transport. Therefore, the sensors based on Al2O3 nanotubes show high sensitivity and fast response/recovery time to humidity. The impedance changes approximately four orders of magnitude as relative humidity (RH) varies from 11% to 95% at the measured frequency of 40 Hz. Additionally, the sensor also presents relatively small hysteresis and long-term stability. For low RH levels, the protonic conductor is dominant, whereas for increasing RH levels the ionic contribution becomes prevalent. This study demonstrates that Al2O3 nanotubes have promising applications in environmental monitoring.Keywords
This publication has 37 references indexed in Scilit:
- A highly sensitive humidity sensor based on a nanofibrous membrane coated quartz crystal microbalanceNanotechnology, 2009
- A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs)Sensors, 2009
- Usage of porous Al2O3 layers for RH sensingMicrosystem Technologies, 2007
- High-Sensitivity Humidity Sensor Based on a Single SnO2 NanowireJournal of the American Chemical Society, 2007
- α‐Fe2O3 Nanotubes in Gas Sensor and Lithium‐Ion Battery ApplicationsAdvanced Materials, 2005
- A Ceramic Thick Film Humidity Sensor Based on MnZn FerriteSensors, 2002
- Water conduction through the hydrophobic channel of a carbon nanotubeNature, 2001
- Fully sealed, high-brightness carbon-nanotube field-emission displayApplied Physics Letters, 1999
- Perspectives in Supramolecular Chemistry—From Molecular Recognition towards Molecular Information Processing and Self‐OrganizationAngewandte Chemie International Edition in English, 1990
- Humidity sensors using KH2PO4-doped porous (Pb, La)(Zr, Ti)O3Journal of Materials Science, 1987