Abstract
This paper describes the development of a novel low-cost Rayleigh Surface Acoustic Wave Resonator (SAWR) device coated with a graphene layer that is capable of detecting PPM levels of NO2in air. The sensor comprises two 262 MHz ST-cut quartz based Rayleigh SAWRs arranged in a dual oscillator configuration; where one resonator is coated with gas-sensitive graphene, and the other left uncoated to act as a reference. An array of NMP-dispersed exfoliated reduced graphene oxide dots was deposited in the active area inside the SAWR IDTs by a non-contacting, micro ink-jet printing system. An automated Mass Flow Controller system has been developed that delivers gases to the SAWR sensors with circuitry for excitation, amplification, buffering and signal read-out. This SAW-based graphene sensor has sensitivity to NO2of ca. 25 Hz/ppm and could be implemented in a low-power low-cost gas sensor.
| Original language | English |
|---|---|
| Pages (from-to) | 999-1002 |
| Number of pages | 4 |
| Journal | Procedia Engineering |
| Volume | 87 |
| DOIs | |
| Publication status | Published - 2014 |
Bibliographical note
© 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.
Keywords
- Dual saw
- Graphene oxide
- NO2detection
- Saw resonator
- Surface acoustic sensor