title: Raman study of 2D anatase TiO2nanosheets.
abstract: Herein, we present for the first time a spectroscopic study of two-dimensional (2D) anatase TiO2nanosheets. Previous publications demonstrated that Raman spectroscopy was mostly employed to characterize the TiO2nanoparticle size and the phase transition of amorphous-anatase and anatase-rutile. In this study, TiO2nanosheets were characterized by XRD, AFM and Raman spectroscopy, which demonstrated a shift toward higher frequency and broadening in the full width at half maximum of the characteristic Egmode by decreasing the thickness of anatase TiO2with a 2D nanostructure. In contrast to the study of TiO2nanoparticles, the Raman vibrations can be attributed to phonon confinement in 2D TiO2nanosheets which can be employed to characterize the thickness of TiO2nanosheets. In order to effectively identify the thickness of the 2D TiO2nanostructure, we established a reliable method for the examination by characterizing the shifts of the Egmode.
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing, 100083, P. R. China. jyzhai@binn.cas.cn.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing, 100083, P. R. China. jyzhai@binn.cas.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Wu
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing, 100083, P. R. China. jyzhai@binn.cas.cn.
authors.forename: Ke
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing, 100083, P. R. China. jyzhai@binn.cas.cn.
authors.forename: Caihong
authors.initials: C
authors.lastname: Liu
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing, 100083, P. R. China. jyzhai@binn.cas.cn.
authors.forename: Aifang
authors.initials: A
authors.lastname: Yu
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing, 100083, P. R. China. jyzhai@binn.cas.cn.
authors.forename: Mingzeng
authors.initials: M
authors.lastname: Peng
authors.affiliation: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, National Center for Nanoscience and Technology (NCNST), Beijing, 100083, P. R. China. jyzhai@binn.cas.cn.
authors.forename: Junyi
authors.initials: J
authors.lastname: Zhai