Chaudhary, Nishant and Singh, Ajay and Aswal, D. K. and Debnath, A. K. and Samanta, S. and Koiry, S. P. and Sharma, S. and Shah, K. and Acharya, S. and Muthe, K. P. and Gadkari, S. C. (2017) Electron beam modified zinc phthalocyanine thin films for radiation dosimeter application. Synthetic Metals, 231. pp. 143-152. ISSN 0379-6779

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Abstract

Present study deals with the effect of electron beam irradiation on electrical and gas sensing properties of zinc phthalocyanine (ZnPc) thin film prepared on flexible Biaxially Oriented Polyethylene Terephthalate (BOPET) sheet. The electron beam irradiation of ZnPc films were carried out using a 10 MeV RF Linear accelerator, under different radiation dose levels from 1 kGy to 30 kGy. The pristine and irradiated films were characterized by using X-ray photoelectron spectroscopy, Atomic Force microscopy, UV-vis spectroscopy and X-ray diffraction. Samples irradiated in the dose range of 1-18 kGy exhibit linear enhancement of electrical conductance due to increasing content of adsorbed oxygen. Beyond 18 kGy the sample exhibit saturation in the content of adsorbed oxygen as well as in electrical conductance. The pristine ZnPc films exhibit excellent chemi-resistive response towards H2S gas in 1-20 ppm range at room temperature. The response of the irradiated films decreases monotonically with increasing electron beam dose due to the strong binding of oxygen at the Zn sites. A plausible mechanism of electron beam induced modification of ZnPc films and its implication on charge transport as well as chemi-resistive gas sensing behavior are discussed. This work highlight the utilization of ZnPc thin films as potential radiation dosimeter based upon linear rise in electrical conductance.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Materials Science Applied Physics/Condensed Matter Polymer Science
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	06 Sep 2018 07:23
Last Modified:	06 Sep 2018 07:23
URI:	http://npl.csircentral.net/id/eprint/2687

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