Hexagonal ZnO nanoplates/graphene composites with excellent sensing performance to NO2 at room temperature - Details

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Abstract：

Metal　oxides　with　high-energy　facets　usually　have　more　active　surface　sites　to　facilitate　gas　adsorption.　In　this　work,　the　ZnO/graphene　composites　are　synthesized　hydrothermally　and　the　morphology　of　ZnO　nanoparticles　can　be　changed　from　nanorods　to　nanoplates　with　the　high-energy　{0001}　polar　surface　exposed　by　changing　the　density　of　sodium　citrate　in　the　reaction.　The　ZnO{0001}/graphene　composites　have　better　sensing　properties　to　NO2　at　room　temperature　(RT).　Based　on　first-principles　calculation,　the　adsorption　energy　of　NO2　on　the　ZnO{0001}　facet　is　more　negative　than　that　on　the　{011¯0}　surface　indicating　stronger　interactions　between　the　former　and　NO2.　Furthermore,　the　ZnO{011¯0}　surface　shows　semiconducting　characteristics,　whereas　the　ZnO{0001}　polar　surface　is　metallic.　The　metallic　characteristics　promote　charge　transfer　at　the　interface　between　ZnO　and　graphene　and　enhance　the　NO2　detection　sensitivity.　©　2020

Keyword：

Calculations Charge transfer Gas adsorption II-VI semiconductors Magnetic semiconductors Morphology Nanorods Nitrogen oxides Oxide minerals Sodium compounds Synthesis (chemical) Wide band gap semiconductors Zinc oxide ZnO nanoparticles

Author Community：

[ 1 ] [Zhang, Lizhai]State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an; Shaanxi; 710049, China
[ 2 ] [Zhang, Lizhai]Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
[ 3 ] [Zhang, Jinniu]College of Physics and Information Technology, Shaanxi Normal University, Xi'an; Shaanxi; 710062, China
[ 4 ] [Huang, Yuhong]College of Physics and Information Technology, Shaanxi Normal University, Xi'an; Shaanxi; 710062, China
[ 5 ] [Xu, Huiyan]Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
[ 6 ] [Xu, Huiyan]Institute for Smart Materials and Engineering, University of Jinan, Jinan; Shandong; 250022, China
[ 7 ] [Zhang, Xiaolin]Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
[ 8 ] [Lu, Hongbing]College of Physics and Information Technology, Shaanxi Normal University, Xi'an; Shaanxi; 710062, China
[ 9 ] [Xu, Kewei]State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an; Shaanxi; 710049, China
[ 10 ] [Xu, Kewei]Department of Physics and Opt-electronic Engineering, Xi'an University of Arts and Science, Xi'an; Shaanxi; 710065, China
[ 11 ] [Chu, Paul K.]Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
[ 12 ] [Ma, Fei]State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an; Shaanxi; 710049, China
[ 13 ] [Ma, Fei]Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong

Reprint Author's Address：

[Xu, Kewei]State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an; Shaanxi; 710049, China;;[Xu, Kewei]Department of Physics and Opt-electronic Engineering, Xi'an University of Arts and Science, Xi'an; Shaanxi; 710065, China;;

Email：

kwxu@mail.xjtu.edu.cn

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Source ：

Applied Surface Science

ISSN： 0169-4332

Year： 2021

Volume： 537

6 . 7 0 7

JCR@2020

ESI Discipline： MATERIALS SCIENCE;

ESI HC Threshold：36

CAS Journal Grade：1

Cited Count：

WoS CC Cited Count： 20

SCOPUS Cited Count： 41

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 3

Affiliated Colleges：

国家重点实验室金属材料强度国家重点实验室

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