title: A modified Wenzel model for water wetting on van der Waals layered materials with topographic surfaces.
abstract: A modified Wenzel model is proposed for describing the wetting behavior of van der Waals layered materials with topographic surfaces, based on the measured linear relationship between water wetting and surface roughness for high quality Bi2Se3thin films, synthesized using molecular beam epitaxy (MBE) in the optimized temperature window of 180-200 °C. The water contact angles are found to have apparent dependence on the nanoscale surface morphology, enabling film wettability as a new tool to quickly characterize the quality of atomically thin films. The water contact angle of the ideal Bi2Se3surface is inferred to be ∼98.4°, indicating its intrinsic hydrophobic nature; however, the edge of the terrace on its surface is extremely hydrophilic, leading to easy hydrophobic/hydrophilic transitions. The atomistic mechanism is further revealed by first principles calculations. The regulated wettability is of great importance for electronic applications of Bi2Se3and other two-dimensional materials with distinctive electronic structures.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn.
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn.
authors.forename: Yutian
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn.
authors.forename: Shuo
authors.initials: S
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn.
authors.forename: Lan
authors.initials: L
authors.lastname: Chen
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn and Collaborative Innovation Center of Quantum Matter, Beijing 100190, China.
authors.forename: Kehui
authors.initials: K
authors.lastname: Wu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Hui
authors.identifier: http://orcid.org/0000-0003-3025-6448
authors.initials: H
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. khwu@iphy.ac.cn huili8@iphy.ac.cn smeng@iphy.ac.cn and Collaborative Innovation Center of Quantum Matter, Beijing 100190, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Meng