Journal
CHEMICAL ENGINEERING JOURNAL
Volume 286, Issue -, Pages 36-47Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.10.052
Keywords
Ni doped ZnO; NO2 sensor; Selectivity; Sensitivity; Gas sensing: HRTEM
Categories
Funding
- UGC - India through UGC-BSR Junior Research Fellowship
- UGC - India through UGC-MAN Senior Research Fellowship
Ask authors/readers for more resources
The use of metal oxide semiconductor (MOS) gas sensors is limited due to lack of selectivity and high operating temperature. The aim of present investigation is to enhance gas response and sensitivity of the zinc oxide (ZnO) based thin film sensor towards nitrogen dioxide (NO2) by Ni doping. The achieved sensitivity is around 4.2%/ppm at moderate operating temperature of 200 degrees C. The gas response of 108% and 482% is observed at 200 degrees C operating temperature, towards 5 ppm and 100 ppm NO2, respectively. Ni doping increased the NO2 response and reduced the lower detection limit of NO2 to 5 ppm which is much lower than the emergency exposure limit (20 ppm). The hybrid structure of nanograined rods and hexagonal flakes are observed which enhanced gas response. The gas response dependence on various physical properties and chemical composition of the sensor is also studied. The response and recovery time of 1.5 atomic percentage (at%) Ni doped ZnO thin film sensor is 11 and 123 s, respectively. The response of the sensor is reproducible and it has negligible cross sensitivity for other interfering gases such as CO2, SO2, H2S, NH3, LPG, methanol, ethanol, and acetone. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available