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Sensors 2013, 13(7), 8814-8826; doi:10.3390/s130708814
Article

A Remote Sensor for Detecting Methane Based on Palladium-Decorated Single Walled Carbon Nanotubes

*  and
School of Communication and Information Engineering, Xi'an University of Science and Technology, No.58, Yan Ta Road, Xi'an 710054, China
* Author to whom correspondence should be addressed.
Received: 27 May 2013 / Revised: 24 June 2013 / Accepted: 27 June 2013 / Published: 10 July 2013
(This article belongs to the Special Issue Gas Sensors - 2013)
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Abstract

The remote detection of the concentration of methane at room temperature is performed by a sensor that is configured by the combination of radio frequency identification (RFID), and functionalized carbon nanotubes (CNTs). The proposed sensor is schemed as a thin film RFID tag in a polyethylene substrate, on which a metal trace dipole, a metal trace T impedance matching networks, a 0.5 µm-CMOS RF/DC rectifier chipset and a sensor head of palladium-decorated single walled carbon nanotubes (Pd-SWCNTs) are surface mounted in cascade. The performances of the sensor are examined and described by the defined parameters of the received signal strength index (RSSI) and the comparative analog identifier (∆AID). Results validate the sensor’s ability to detect molecules of methane at room temperature, showing that the RSSI can increase 4 dB and the ∆AID can increase 3% in response to methane concentrations ranging from zero to 100 ppm.
Keywords: gas sensor; methane concentration; Pd-SWCNTs; RFID; room temperature gas sensor; methane concentration; Pd-SWCNTs; RFID; room temperature
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Liu, J.; Li, G. A Remote Sensor for Detecting Methane Based on Palladium-Decorated Single Walled Carbon Nanotubes. Sensors 2013, 13, 8814-8826.

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