Characterisation and optical vapour sensing properties of PMMA thin films

CAPAN, I., TARIMCI, C., HASSAN, A. K. and TANRISEVER, T. (2009). Characterisation and optical vapour sensing properties of PMMA thin films. Materials science and engineering c-biomimetic and supramolecular systems, 29 (1), 140-143.

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The present article reports on the characterisation of spin coated thin films of poly (methyl methacrylate) (PMMA) for their use in organic vapour sensing application. Thin film properties of PMMA are studied by UV-visible spectroscopy, atomic force microscopy and surface plasmon resonance (SPR) technique. Results obtained show that homogeneous thin films with thickness in the range between 6 and 15 nm have been successfully prepared when films were spun at speeds between 1000-5000 rpm. Using SPR technique, the sensing properties of the spun films were studied on exposures to several halohydrocarbons including chloroform, dichloromethane and trichloroethylene. Data from measured kinetic response have been used to evaluate the sensitivity of the studied films to the various analyte molecules in terms of normalised response (%) per unit concentration (ppm). The highest PMMA film sensitivity of 0.067 normalised response per ppm was observed for chloroform vapour, for films spun at 1000 rpm. The high film's sensitivity to chloroform vapour was ascribed mainly to its solubility parameter and molar volume Values. Effect of film thickness on the vapour sensing properties is also discussed. (C) 2008 Elsevier B.V. All rights reserved.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:
Page Range: 140-143
Depositing User: Helen Garner
Date Deposited: 19 May 2010 12:37
Last Modified: 18 Mar 2021 21:15

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