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Terasawa, Tomoo; Katsube, Daiki*; Yano, Masahiro; Ozawa, Takahiro*; Tsuda, Yasutaka; Yoshigoe, Akitaka; Asaoka, Hidehito; Suzuki, Seiya
Chemistry of Materials, 38(6), p.2933 - 2945, 2026/03
Times Cited Count：0Kanai, Shun*; Suzuki, Seiya; Anderson, C. P.*
MRS Bulletin, 51, 6 Pages, 2026/00
Times Cited Count：0Yuhara, Junji*; Maeda, Shota*; Katsube, Daiki*; Suzuki, Seiya; Terasawa, Tomoo; Takakura, Shoichi*; Nakatake, Masashi*; Le Lay, G.*
2D Materials (Internet), 12(4), p.045023_1 - 045023_10, 2025/10
Times Cited Count：1 Percentile：0.00(Nanoscience & Nanotechnology)Suzuki, Seiya; Katsube, Daiki*; Yano, Masahiro; Tsuda, Yasutaka; Terasawa, Tomoo; Ozawa, Takahiro*; Fukutani, Katsuyuki; Kim, Y.*; Asaoka, Hidehito; Yuhara, Junji*; et al.
Small Methods, 9(3), p.2400863_1 - 2400863_9, 2025/03
Times Cited Count：4 Percentile：32.24(Chemistry, Physical)Jo, Sadaharu*; Suzuki, Seiya; Yoshimura, Masamichi*
Japanese Journal of Applied Physics, 63(6), p.065503_1 - 065503_4, 2024/06
Times Cited Count：0 Percentile：0.00(Physics, Applied)Suzuki, Seiya; Nemoto, Yoshihiro*; Shiiki, Natsumi*; Nakayama, Yoshiko*; Takeguchi, Masaki*
Annalen der Physik, 535(9), p.2300122_1 - 2300122_12, 2023/09
Times Cited Count：1 Percentile：15.68(Physics, Multidisciplinary)Suzuki, Yohei*; Konno, Yuta*; Fukuda, Akari*; Komatsu, Daisuke*; Hirota, Akinari*; Watanabe, Katsuaki*; Togo, Yoko*; Morikawa, Noritoshi*; Hagiwara, Hiroki; Aosai, Daisuke*; et al.
PLOS ONE (Internet), 9(12), p.e113063_1 - e113063_20, 2014/12
Times Cited Count：15 Percentile：36.80(Multidisciplinary Sciences)We present multi-isotopic evidence of microbially mediated sulfate reduction in a granitic aquifer, a representative of the terrestrial crust habitat. Deep groundwater of meteoric origin was collected from underground boreholes drilled into the Cretaceous Toki granite, central Japan. A large sulfur isotopic fractionation of 20-60 permil diagnostic to microbial sulfate reduction is associated with the investigated groundwater containing sulfate below 0.2 mM. In contrast, a small carbon isotopic fractionation (
30 permil) is not indicative of methanogenesis. Our results demonstrate that the deep biosphere in the terrestrial crust is metabolically active and playing a crucial role in the formation of reducing groundwater even under low energy fluxes.
Nagao, Seiya*; Niibori, Yuichi*; Tanaka, Tadao; Sasaki, Takayuki*; Saito, Takumi*; Kirishima, Akira*; Yoshikawa, Hideki; Iijima, Kazuki; Hama, Katsuhiro; Iwatsuki, Teruki; et al.
Genshiryoku Bakkuendo Kenkyu (CD-ROM), 20(1), p.3 - 14, 2013/06
This paper shows a current status of groundwater colloids studies on the performance assessment of geological disposal of radioactive wastes in Japan, and summaries realistic approach of the colloids studies at a substantial research network for Japanese universities and institutes.
Nagao, Seiya; Matsunaga, Takeshi; Suzuki, Yasuhiro*; Hiraki, Keizo*
Chikyu Kagaku, 35(3), p.107 - 120, 2001/08
no abstracts in English
Nagao, Seiya; Nakaguchi, Yuzuru*; Suzuki, Yasuhiro*; Hiraki, Keizo*; Fujitake, Nobuhide*; Ogawa, Hiromichi
Proceedings of International Conference on the Biogeochemistry of Trace Elements (ICOBTE2001), P. 666, 2001/00
no abstracts in English
Imanaka, Masayo*; Nagao, Seiya; Nakaguchi, Yuzuru*; Yamaguchi, Yoshitaka*; Suzuki, Yasuhiro*; Murakami, Masahiro*; Hiraki, Keizo*
Proceedings of International Conference on the Biogeochemistry of Trace Elements (ICOBTE2001), P. 662, 2001/00
no abstracts in English
Nagao, Seiya; Tanaka, Tadao; Nakaguchi, Yuzuru*; Suzuki, Yasuhiro*; Muraoka, Susumu; Hiraki, Keizo*
Understanding and Maraging Organic Matter in Soils, Sediments and Waters, p.525 - 532, 2001/00
no abstracts in English
Suzuki, Yasuhiro*; Nakaguchi, Yuzuru*; Hiraki, Keizo*; Nagao, Seiya; ;
Chikyu Kagaku, 32, p.21 - 30, 1998/00
no abstracts in English
Nagao, Seiya; Suzuki, Yasuhiro*; Nakaguchi, Yuzuru*; ; Hiraki, Keizo*
Bunseki Kagaku, 46(5), p.335 - 342, 1997/00
no abstracts in English
Suzuki, Yasuhiro*; Nagao, Seiya; Nakaguchi, Yuzuru*; Matsunaga, Takeshi; Muraoka, Susumu; Hiraki, Keizo*
Chikyu Kagaku, 31, p.171 - 180, 1997/00
no abstracts in English
Suzuki, Seiya; Katsube, Daiki*; Yano, Masahiro; Tsuda, Yasutaka; Terasawa, Tomoo; Asaoka, Hidehito; Yuhara, Junji*; Yoshigoe, Akitaka
no journal, ,
Germanene is a two-dimensional (2D) sheet of germanium (Ge) with a honeycomb lattice. Recent theoretical studies have predicted several interesting electronic properties of germanene, such as 2D topological insulators. However, unlike graphene, germanene is easily oxidized in air, making it difficult to realize electrical devices based on germanene. To overcome the drawback of the chemical stability of germanene, it is necessary to understand how germanene is oxidized. Therefore, we started to study germanene and discovered an interesting phenomenon: oxidized germanene can be restored to good quality germanene simply by heating it in ultra-high vacuum (UHV). X-ray photoelectron spectroscopy spectra and low energy electron diffraction patterns indicate that the oxidized germanene is fully recovered after heating at 500 degrees Celsius. The detailed mechanism of the recovery will be discussed in the presentation.
Ochiai, Shinya*; Nagao, Seiya*; Nakanishi, Takahiro; Tsuruta, Tadahiko; Misono, Toshiharu; Watanabe, Shun*; Suzuki, Kyuma*; Tomihara, Seiichi*
no journal, ,
We investigated the controlling factors of radiocesium derived from the nuclear accident in each river systems in Fukushima Prefecture and the surrounding area. Dissolved 
Cs concentration / Cs deposition ratio tended to be higher in the Tone River and lower in the Natsui River than in the Abukuma River. Dissolved Cs concentration generally decreases exponentially, but the half-life is shorter in the Natsui River and longer in the Tone River than in the Abukuma River.
Suzuki, Seiya; Nemoto, Yoshihiro*; Shiiki, Natsumi*; Nakayama, Yoshiko*; Takeguchi, Masaki*
no journal, ,
Suzuki, Seiya; Yano, Masahiro
no journal, ,
no abstracts in English
Terasawa, Tomoo; Katsube, Daiki*; Yano, Masahiro; Ozawa, Takahiro*; Tsuda, Yasutaka; Yoshigoe, Akitaka; Asaoka, Hidehito; Suzuki, Seiya
no journal, ,
Germanene, a monolayer honeycomb lattice of Ge atoms, is theoretically predicted to have both a linear band dispersion and a band gap of 23.9 meV and is expected to be a next-generation semiconductor material. The purpose of the present study was to elucidate the growth mechanism of germanene by in situ Raman scattering spectroscopy in a vacuum chamber. The results suggest that Ge atoms crystallize as sp3Ge at around 300 degrees C, but when the temperature is raised to 500 degrees C and then lowered to around 300 degrees C, germanene is formed.
