title: Free-Standing Single-Molecule Thick Crystals Consisting of Linear Long-Chain Polymers.
abstract: Organic two-dimensional (2D) crystals are fundamentally important for development of future devices. Despite that more than a half of man-made products contain polymers, 2D crystals consisting of long linear chains have yet to be explored. Here we report on the fabrication of 2D polyaniline (PANI) crystals via rational electrochemical polymerization followed by liquid-phase exfoliation. The 2D PANI is molecularly thin (∼0.8 nm) and composed of PANI chains with a number-average molecular weight of ∼31 000. The chains are parallel to each other with the benzene rings standing almost vertically to the surface, implying a face-to-face arrangement of the neighboring chains held together by abundant π-π interactions augmented with hydrogen bonds. The 2D PANI can be readily transferred to various solid surfaces and exhibit interesting electrical and optical properties, suggesting that they would be potentially useful in photoelectronic devices and other applications.
authors.affiliation: Key Laboratory of Automobile Materials of MOE, State Key Laboratory of Automotive Simulation and Control, and Department of Materials Science, Jilin University , Changchun, Jilin 130000, China.|Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Renwei
authors.initials: R
authors.lastname: Liu
authors.affiliation: Key Laboratory of Automobile Materials of MOE, State Key Laboratory of Automotive Simulation and Control, and Department of Materials Science, Jilin University , Changchun, Jilin 130000, China.|Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Suna
authors.initials: S
authors.lastname: Fan
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Xiao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Mengzhou
authors.initials: M
authors.lastname: Liao
authors.affiliation: Key Laboratory of Automobile Materials of MOE, State Key Laboratory of Automotive Simulation and Control, and Department of Materials Science, Jilin University , Changchun, Jilin 130000, China.
authors.forename: Shansheng
authors.initials: S
authors.lastname: Yu
authors.affiliation: Key Laboratory of Automobile Materials of MOE, State Key Laboratory of Automotive Simulation and Control, and Department of Materials Science, Jilin University , Changchun, Jilin 130000, China.
authors.forename: Fanling
authors.initials: F
authors.lastname: Meng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Baoli
authors.initials: B
authors.lastname: Liu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Meng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Guangyu
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Automobile Materials of MOE, State Key Laboratory of Automotive Simulation and Control, and Department of Materials Science, Jilin University , Changchun, Jilin 130000, China.
authors.forename: Weitao
authors.initials: W
authors.lastname: Zheng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Shuxin
authors.initials: S
authors.lastname: Hu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.|School of Physical Sciences, University of Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Ming
authors.identifier: 0000-0002-5328-5826
authors.initials: M
authors.lastname: Li
keywords: Two-dimensional crystals; anisotropic electrical conductivity; electrochemical polymerization; liquid-phase exfoliation; polyaniline