Publication: Investigation of thermal and methanol-vapor treatments for MgTPP as an optical gas sensor
Issued Date
2009-10-12
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2-s2.0-70349679328
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Mahidol University
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SCOPUS
Bibliographic Citation
4th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2009. (2009), 843-847
Suggested Citation
Sumana Kladsomboon, Sirapat Pratontep, Theerapom Puntheeranurak, Teerakiat Kerdcharoen Investigation of thermal and methanol-vapor treatments for MgTPP as an optical gas sensor. 4th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2009. (2009), 843-847. doi:10.1109/NEMS.2009.5068707 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/27547
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Title
Investigation of thermal and methanol-vapor treatments for MgTPP as an optical gas sensor
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Abstract
In this paper, we have investigated the sensing properties of magnesium - 5,10,15,20 - tetraphenyl - porphyrin (MgTPP) to various volatile organic compounds (VOCs). The spin-coated MgTPP thin films were subjected to thermal annealing and methanol-vapor exposure to study the effects of pre-treatment on the sensing properties. Atomic force microscopy (AFM) has shown that both pre-treatment techniques have induced re-crystallization of the film, thereby improving the sensitivity over the as-deposited film. The thermally annealed films were found more effective than the methanol-vapor treated ones. The in-house optical sensor setup was applied to discriminate various VOCs and alcoholic beverages. Principal component analysis (PCA) confirms that the thermally annealed MgTPP thin film can distinguish several kinds of VOCs. Computational density functional theory (DFT) indicates that the interaction energy between analyte and sensing molecules can be used to explain comparative sensitivity. © 2009 IEEE.