Positron annihilation studies of mesoporous silica films using a slow positron beam |
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Authors: | Chunqing He Makoto Muramatsu Atsushi Kinomura Kenji Ito |
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Institution: | a National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan b National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan |
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Abstract: | Positron annihilation lifetime spectra were measured for mesoporous silica films, which were synthesized using triblock copolymer (EO106PO70EO106) as a structure-directing agent. Different positron lifetime spectra for the deposited and calcined films indicated the formation of meso-structure after calcination, which was confirmed by Fourier transform infrared (FTIR) spectra and field emission-scanning electron microscopy (FE-SEM) observation. Open porosity or pore interconnectivity of a silica film might be evaluated by a two-dimensional positron annihilation lifetime spectrum of an uncapped film. Pore sizes and their distributions in the silica films were found to be affected by thermal treatments. |
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Keywords: | Positron annihilation Mesoporous film Slow positron beam |
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