@article{oai:tsukuba.repo.nii.ac.jp:00040376, author = {近藤, 剛弘 and 中村, 潤児 and 丹羽, 秀治 and Kiuchi, Hisao and Shibuya, Riku and Kondo, Takahiro and Nakamura, Junji and Niwa, Hideharu and Miyawaki, Jun and Kawai, Maki and Oshima, Masaharu and Harada, Yoshihisa}, issue = {1277}, journal = {Nanoscale Research Letters}, month = {Mar}, note = {The characteristics of CO2 adsorption sites on a nitrogen-doped graphite model system (N-HOPG) were investigated by X-ray photoelectron and absorption spectroscopy and infrared reflection absorption spectroscopy. Adsorbed CO2 was observed lying flat on N-HOPG, stabilized by a charge transfer from the substrate. This demonstrated that Lewis base sites were formed by the incorporation of nitrogen via low-energy nitrogen-ion sputtering. The possible roles of twofold coordinated pyridinic N and threefold coordinated valley N (graphitic N) sites in Lewis base site formation on N-HOPG are discussed. The presence of these nitrogen species focused on the appropriate interaction strength of CO2 indicates the potential to fine-tune the Lewis basicity of carbon-based catalysts.}, title = {Lewis Basicity of Nitrogen-Doped Graphite Observed by CO2 Chemisorption}, volume = {11}, year = {2016} }