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ThinkMind // ALLSENSORS 2017, The Second International Conference on Advances in Sensors, Actuators, Metering and Sensing // View article allsensors_2017_4_30_70068


Aluminum-doped Zinc Oxide Nanocrystals for NO2 Detection at Low Temperature

Authors:
Sandrine Bernardini
Bruno Lawson
Olivier Margeat
Khalifa Aguir
Christine Videlot-Ackermann
Jörg Ackermann

Keywords: Gas sensor; NO2 sensor; light excitation; Al-ZnO nanocrystals, Ultraviolet illumination

Abstract:
In this work, we focus on nitrogen dioxide (NO2) detection at temperature up to 100°C in order to be compatible with most of flexible substrates. Such low temperatures require dedicated materials, as Zinc Oxide (ZnO), a widely used material for its sensing properties. Functionalization or doping is a growing research activity to improve sensor sensibility at lower gas concentrations and lower working temperatures. Aluminum-doped Zinc Oxide (Al-ZnO) has been shown as a possible way for NO2 detection. Moreover, nanocrystals improve the gas detection due to their high surface/volume ratio. Therefore in this work, Al-ZnO nanocrystals have been deposited by drop coating from colloidal solution as sensitive layer for air quality monitoring. The platform consists of Ti/Pt interdigitated electrodes on Si/SiO2 substrate. Herein, a brief description of the process steps will be provided. Gas sensing properties have been investigated in dark and under ultraviolet illumination at various heating excitation from room temperature around 25°C up to 100°C. These sensors present repeatable responses toward (NO2) with fast responses for low gas concentrations as low as 0.2 ppm.

Pages: 56 to 57

Copyright: Copyright (c) IARIA, 2017

Publication date: March 19, 2017

Published in: conference

ISSN: 2519-836X

ISBN: 978-1-61208-543-2

Location: Nice, France

Dates: from March 19, 2017 to March 23, 2017

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