Format

Send to

Choose Destination
Talanta. 2009 Feb 15;77(4):1409-14. doi: 10.1016/j.talanta.2008.09.038. Epub 2008 Oct 1.

Cr2O3-modified ZnO thick film resistors as LPG sensors.

Author information

1
Nano-Materials Research Lab, Pratap College, Amalner, MHS, India. plalchand phy aml@yahoo.co.in

Abstract

Thick films of pure ZnO were obtained by screen-printing technique. Surface functionalized ZnO thick films by Cr(2)O(3) were obtained by dipping pure ZnO thick films into 0.01M aqueous solution of chromium trioxide (CrO(3)). The dipped films were fired at 500 degrees C for 30 min. Upon firing, the CrO(3) would reduce to Cr(2)O(3). Cr(2)O(3)-activated (0.47 mass%) ZnO thick films resulted in LPG sensor. Upon exposure to 100 ppm LPG, the barrier height between Cr(2)O(3) and ZnO grains decreases markedly, leading to a drastic decrease in resistance. The sensor was found to sense LPG at 350 degrees C and no cross sensitivity was observed to other hazardous, polluting and inflammable gases. The quick response ( approximately 18s) and fast recovery ( approximately 42s) are the main features of this sensor. The effects of microstructures and dopant concentrations on the gas sensing performance of the sensor were studied and discussed.

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center