Proton conduction in nanopores of sol–gel-derived porous glasses and thin films
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Nanoporous glasses and nanoporous thin films were prepared using sol–gel method, and proton conductivities in nanopores of sol–gel-derived porous glasses and thin films are overviewed in this paper. Proton motions inside nanopores were monitored by impedance and nuclear magnetic resonance (NMR) spectroscopies. The impedance data is correlated with the proton motion in bulk scale, whereas NMR data is correlated with that in nanometer scale, respectively. From the comparison of the activation energies obtained from impedance and NMR spectroscopies, percolation of proton conducting path and its relation to the amount of absorbed water molecules are shown. In the case of nanoporous thin films, directions of pores can be controlled by using cationic and non-ionic surfactants. Relationship between direction of pores and proton conductivity is discussed based on impedance test results.
KeywordsProton conduction Nanopore Spin–lattice relaxation time NMR
The author, Y. Daiko, is deeply grateful to Dr. M. Nogami and Dr. T. Kasuga (Nagoya Inst. Tech.), Dr. T. Yazawa and Dr. A. Mineshige (Univ. Hyogo), Dr. T. Minami (Osaka Prefecture Univ.), Dr. A. Matsuda and Dr. H. Muto (Toyohashi Univ. Technol.) and Dr. K. Katagri (Hiroshima Univ.) for their kind supports and fruitful discussions. Advisers and colleagues of the author’s researches are also all very much appreciated. The works described in this paper are partially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan (Grant-in-Aid for Young Scientists, No. 23686095).
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