Direct Atomic-Scale Structure and Electric Field Imaging of Triazine-Based Crystalline Carbon Nitride

Wang，Wu1; Cui，Juan1; Sun，Zongzhao2; Xie，Lin1; Mu，Xiaoke3; Huang，Limin2; He，Jiaqing1,4

2021

10.1002/adma.202106359

ADVANCED MATERIALS   影响因子和分区

0935-9648

1521-4095

Crystalline carbon nitrides (CNs) have recently attracted considerable attention owing to their superior photocatalytic activity. However, the electron-beam-sensitive nature of crystalline CNs hinders atomic-resolution imaging of their local structures by conventional (scanning) transmission electron microscopy ((S)TEM) techniques. Here, the atomic structure of a triazine-based crystalline CN, poly(triazine imide) (PTI) incorporated with lithium and chloride ions, is unambiguously revealed using the emerging imaging technique of differential phase contrast STEM under a low dose. The lightest-element Li/H configuration is resolved within framework cavities of PTI and significantly affects the electronic structure for photoabsorption. The atomic electric field of PTI crystal directly determined in real space provides a fundamental evidence for the chemical bonding of Li ions and adjacent atoms for the migration of photogenerated carriers. These results facilitate the comprehension on local atomic configuration and chemical bonding state of crystalline CNs and can lead to a deeper understanding of the photocatalytic mechanism.

atomic electric field carbon nitride chemical bonding DPC-STEM imaging local atomic configuration

SCI ; EI

英语

NI论文

第一 ; 通讯

WOS:000700027800001

20213910947385

Atoms ; Carbon nitride ; Chemical bonds ; Chlorine compounds ; Crystal atomic structure ; Electronic structure ; High resolution transmission electron microscopy ; Photocatalytic activity ; Scanning electron microscopy

Electricity: Basic Concepts and Phenomena:701.1 ; Optical Devices and Systems:741.3 ; Physical Chemistry:801.4 ; Atomic and Molecular Physics:931.3 ; Crystal Lattice:933.1.1

MATERIALS SCIENCE

2-s2.0-85115734280

Scopus

1.Shenzhen Key Laboratory of Thermoelectric Materials,Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China
3.Institute of Nanotechnology,Karlsruhe Institute of Technology,Eggenstein-Leopoldshafen,76344,Germany
4.Guangdong Provincial Key Laboratory of Energy Materials for Electric Power,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Wu,Cui，Juan,Sun，Zongzhao,et al. Direct Atomic-Scale Structure and Electric Field Imaging of Triazine-Based Crystalline Carbon Nitride[J]. ADVANCED MATERIALS,2021,33.

Wang，Wu.,Cui，Juan.,Sun，Zongzhao.,Xie，Lin.,Mu，Xiaoke.,...&He，Jiaqing.(2021).Direct Atomic-Scale Structure and Electric Field Imaging of Triazine-Based Crystalline Carbon Nitride.ADVANCED MATERIALS,33.

Wang，Wu,et al."Direct Atomic-Scale Structure and Electric Field Imaging of Triazine-Based Crystalline Carbon Nitride".ADVANCED MATERIALS 33(2021).