A wireless, passive carbon nanotube-based gas sensor
Top Cited Papers
- 7 August 2002
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Sensors Journal
- Vol. 2 (2) , 82-88
- https://doi.org/10.1109/jsen.2002.1000247
Abstract
A gas sensor, comprised of a gas-responsive multiwall carbon nanotube (MWNT)-silicon dioxide (SiO/sub 2/) composite layer deposited on a planar inductor-capacitor resonant circuit is presented here for the monitoring of carbon dioxide (CO/sub 2/), oxygen (O/sub 2/), and ammonia (NH/sub 3/). The absorption of different gases in the MWNT-SiO/sub 2/ layer changes the permittivity and conductivity of the material and consequently alters the resonant frequency of the sensor. By tracking the frequency spectrum of the sensor with a loop antenna, humidity, temperature, as well as CO/sub 2/, O/sub 2/ and NH/sub 3/ concentrations can be determined, enabling applications such as remotely monitoring conditions inside opaque, sealed containers. Experimental results show the sensor response to CO/sub 2/ and O/sub 2/ is both linear and reversible. Both irreversible and reversible responses are observed in response to NH/sub 3/, indicating both physisorption and chemisorption of NH/sub 3/ by the carbon nanotubes. A sensor array, comprised of an uncoated, SiO/sub 2/ coated, and MWNT-SiO/sub 2/ coated sensor, enables CO/sub 2/ measurement to be automatically calibrated for operation in a variable humidity and temperature environment.Keywords
This publication has 26 references indexed in Scilit:
- Principles of solid state oxygen sensors for lean combustion gas controlElectrochimica Acta, 2001
- Instrument development and application in studies and monitoring of ambient ammoniaAtmospheric Environment, 2001
- CO2 Technology Platform: An Important Tool for Environmental Problem SolvingAngewandte Chemie International Edition in English, 2001
- A new process for fabricating CO2-sensing layers based on BaTiO3 and additivesSensors and Actuators B: Chemical, 2000
- Effects of Gas Adsorption and Collisions on Electrical Transport in Single-Walled Carbon NanotubesPhysical Review Letters, 2000
- A practical capacitive type CO2 sensor using CeO2/BaCO3/CuO ceramicsSensors and Actuators B: Chemical, 2000
- A capacitive CO2 sensor system with suppression of the humidity interferenceSensors and Actuators B: Chemical, 1999
- Carbon nanotubes and gas adsorptionPublished by AIP Publishing ,1999
- Application of an iterative approach for development of a microbial model predicting the shelf-life of packed fishInternational Journal of Food Microbiology, 1997
- Design of a conductimetric pH microsensor based on reversibly swelling hydrogelsSensors and Actuators B: Chemical, 1993