Publication: Molecular interactions between alcohols and metal phthalocyanine thin films for optical gas sensor applications
Issued Date
2009-01-01
Resource Type
ISSN
18674941
09308989
09308989
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2-s2.0-84888580926
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Mahidol University
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SCOPUS
Bibliographic Citation
Springer Proceedings in Physics. Vol.129, (2009), 211-215
Suggested Citation
Sureeporn Uttiya, Sumana Kladsomboon, Onanong Chamlek, Wiriya Suwannet, Tanakorn Osotchan, Teerakiat Kerdcharoen, Martin Brinkmann, Sirapat Pratontep Molecular interactions between alcohols and metal phthalocyanine thin films for optical gas sensor applications. Springer Proceedings in Physics. Vol.129, (2009), 211-215. doi:10.1007/978-3-540-95930-4_35 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/28350
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Title
Molecular interactions between alcohols and metal phthalocyanine thin films for optical gas sensor applications
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Abstract
© 2009, Springer-Verlag Berlin Heidelberg. Optically active organic gas sensors represent a promising molecular sensing device with low power consumption. We report experimental and computational investigations into the molecular interactions of metal phthalocyanine thin films with alcohol vapor. In the gas-sensing regime, the interactions of zinc phthalocyanine and alcohol molecules were studied by the Density Functional Theory (DFT) calculations, in comparison to the x-ray absorption spectroscopy. The DFT results reveal a reversible charge interaction mechanism between the zinc atom and the oxygen atom in the alcohol OH group, which corresponds to a shift in the x-ray absorption edge of the zinc atom. In the irreversible interaction regime, the effect of saturated alcohol vapor on spin-coated zinc phthalocyanine films was studied by the phase contrast microscopy, the optical absorption spectroscopy, and the transmission electron microscopy. Annealing the spin-coated films in saturated methanol vapor was found to induce an irreversible structural transformation from an amorphous to a crystalline phase, similar to the effect of a thermal annealing process. These crystallization processes of the zinc phthalocyanine films were also found to enhance their stability and alcohol sensing performance.