Humidity sensing by luminescence of Eu(III)-doped mesoporous silica thin film |
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| Authors: | Jin-Young Park Myungkoo Suh Young-Uk Kwon |
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| Affiliation: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, PR China;2. Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA;3. Zhongshan R&D Center for Materials Surface and Thin Films Technology of the South China University of Technology, Gent Materials Surface Technology (Guangdong) Co., Ltd, Zhongshan 528437, China |
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| Abstract: | We report the luminescence properties of Eu(III)-doped mesoporous silica thin films (Eu-MSTFs) and their application to humidity sensing. Eu-MSTFs with ～9 nm-sized pores ordered into a wormlike pore structure were synthesized. The Eu(III) ions inside the pores could be coordinated with 1,10-phenanthroline or 2,5-pyridine dicarboxylic acid ligand by diffusing in the ligand molecules through the pores. The ligand molecules increased the luminescence intensity of the Eu(III) ions. The luminescence intensity of the ligand-treated Eu-MSTFs varied linearly with the humidity level in the environment. The humidity sensing by this method is repeatable over many times. |
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