Please use this identifier to cite or link to this item:
http://archive.cmb.ac.lk:8080/xmlui/handle/70130/6150
Title: | Surface properties of sulphur based surface modified n-Cu2O thin films for enhanced liquefied petroleum gas sensing |
Authors: | Bandara, K.N.D. Jayathilaka, K.M.D.C. Gunewardene, M. S. Dissanayake, D.P Jayanetti, J. K. D. S. |
Keywords: | electrodeposition gas sensor liquefied petroleum gas sulphidation cuprous oxide surface wetting |
Issue Date: | 2017 |
Publisher: | IOP Publishing Ltd |
Citation: | Bandara, K N D., Jayathilaka K M D C., Gunewardene, M S., Dissanayake, D P. & Jayanetti, J K D S (2017) Surface properties of sulphur based surface modified n-Cu2O thin films for enhanced liquefied petroleum gas sensing, Journal of Physics D: Applied Physics, 50 (48), 11. https://doi.org/10.1088/1361-6463/aa9204 |
Abstract: | The surface of electrodeposited n-Cu2O thin films were modified by sulphidation using aqueous Na2S followed by (NH4)2S vapor treatment. Compared to untreated thin films, the resultant films showed an enhanced response to liquefied petroleum (LP) gas at a relatively low operating temperature (~45 °C), one of the lowest reported for a cuprous oxide based material. X-ray diffraction spectra confirmed that the films were of single phase. Observed by contact angle measurements and energy dispersive x-ray spectroscopy, (NH4)2S vapor treatment converted the highly wetting sulphided films containing both Na and S to a partially wetting surface by forming sulphur on the film surface. This modification on the film surface, enabled the sensor response to recover to an ambient level after stoppage of LP gas flow, which sulphidation alone was inapt. Scanning electron micrographs complemented roughness measurements made by atomic force microscopy and showed a transformation of polycrystalline morphology of bare n-Cu2O film to one having highly porous structures, which thereby increased the surface area of the surface modified films. Therefore, this work demonstrates that the surface of the n-type Cu2O thin films modified by (NH4)2S vapor treatment and sulphidation can alter the surface wetting nature and increase the surface area to enhance LP gas sensing at a relatively low temperature. |
URI: | http://archive.cmb.ac.lk:8080/xmlui/handle/70130/6150 |
Appears in Collections: | Department of Instrumentation & Automation Technology |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
5. Cu2O-CuxS surface properties - Bandara et al. 2017_J._Phys.D_Appl.Phys..pdf | 3.35 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.