Galvanomagnetic properties of air-stable and highly conductive potassium-intercalated graphite sheet |
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Authors: | Yumemi Gotoh Koji Tamada Noboru Akuzawa Rika Matsumoto Masatsugu Fujishige Kenji Takeuchi Morinobu Endo Yasushi Soneda Tsutomu Takeichi |
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Affiliation: | 1. Tokyo National College of Technology, 1220-2 Kunugida, Hachioji, Tokyo 193-0997, Japan;2. Tokyo Polytechnic University, 1583 Iiyama, Atsugi, Kanagawa 243-0297, Japan;3. Shinshu University, 4-17-1 Wakasato, Nagano-shi, Nagano 380-8553, Japan;4. National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan;5. Toyohashi University of Technology, 1-1 Hibarigaoka, Tenpaku-cho, Toyohashi-shi, Aichi 441-8580, Japan |
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Abstract: | Magnetoresistance and Hall coefficient of air-stable potassium-intercalated graphite sheets (hereafter abbreviated as K-PGS) were determined at room temperature. The magnitude of the magnetoresistance and the absolute value of Hall coefficient of K-PGS decreased with increasing potassium content of K-PGS, nK/nC. Two-carrier model was used for calculating carrier density and mobility. The electron density increased with increasing nK/nC: 3.07×1020 cm−3 (nK/nC=0.005), 5.67×1020 cm−3 (nK/nC=0.008) and 6.40×1020 cm−3 (nK/nC=0.011). The value of the electron density of K-PGS with nK/nC=0.011 (nominal composition KC91) was about 80% of the reported value, 7.8×1020 cm−3, for KC48 (nK/nC=0.021) prepared from HOPG (highly oriented pyrolytic graphite). The mobility decreased with increasing nK/nC: 2.11×103 cm2 V−1 s−1 (nK/nC=0.005), 1.42×103 cm2 V−1 s−1 (nK/nC=0.008) and 1.34×103 cm2 V−1 s−1 (nK/nC=0.011). The value of the mobility of K-PGS with nK/nC=0.011 was about 60% of the reported value (2300 cm2 V−1 s−1) for KC48 prepared from HOPG. |
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Keywords: | A. Electronic materials B. Chemical synthesis D. Electrical conductivity D. Electrical properties D. Transport properties |
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