中国物理B ›› 2019, Vol. 28 ›› Issue (6): 66801-066801.doi: 10.1088/1674-1056/28/6/066801

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Real-space observation on standing configurations of phenylacetylene on Cu (111) by scanning probe microscopy

Jing Qi(戚竞), Yi-Xuan Gao(高艺璇), Li Huang(黄立), Xiao Lin(林晓), Jia-Jia Dong(董佳家), Shi-Xuan Du(杜世萱), Hong-Jun Gao(高鸿钧)   

  1. 1 Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China;
    2 Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China;
    3 Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China
  • 收稿日期:2019-03-11 修回日期:2019-04-04 出版日期:2019-06-05 发布日期:2019-06-05
  • 通讯作者: Li Huang, Shi-Xuan Du E-mail:lhuang@iphy.ac.cn;sxdu@iphy.ac.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFA0202300 and 2018YFA0305800), the National Natural Science Foundation of China (Grant Nos. 61888102, 61474141, and 21661132006), the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11604373), the Outstanding Youth Science Foundation, China (Grant No. 61622116), and the Strategic Priority Research Program of Chinese Academy of Sciences (CAS) (Grant Nos. XDB28000000 and XDB30000000).

Real-space observation on standing configurations of phenylacetylene on Cu (111) by scanning probe microscopy

Jing Qi(戚竞)1, Yi-Xuan Gao(高艺璇)1, Li Huang(黄立)1, Xiao Lin(林晓)1, Jia-Jia Dong(董佳家)2, Shi-Xuan Du(杜世萱)1,3, Hong-Jun Gao(高鸿钧)1,3   

  1. 1 Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China;
    2 Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China;
    3 Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China
  • Received:2019-03-11 Revised:2019-04-04 Online:2019-06-05 Published:2019-06-05
  • Contact: Li Huang, Shi-Xuan Du E-mail:lhuang@iphy.ac.cn;sxdu@iphy.ac.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFA0202300 and 2018YFA0305800), the National Natural Science Foundation of China (Grant Nos. 61888102, 61474141, and 21661132006), the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11604373), the Outstanding Youth Science Foundation, China (Grant No. 61622116), and the Strategic Priority Research Program of Chinese Academy of Sciences (CAS) (Grant Nos. XDB28000000 and XDB30000000).

摘要:

The adsorption configurations of molecules adsorbed on substrates can significantly affect their physical and chemical properties. A standing configuration can be difficult to determine by traditional techniques, such as scanning tunneling microscopy (STM) due to the superposition of electronic states. In this paper, we report the real-space observation of the standing adsorption configuration of phenylacetylene on Cu (111) by non-contact atomic force microscopy (nc-AFM). Deposition of phenylacetylene at 25 K shows featureless bright spots in STM images. Using nc-AFM, the line features representing the C-H and C-C bonds in benzene rings are evident, which implies a standing adsorption configuration. Further density functional theory (DFT) calculations reveal multiple optimized adsorption configurations with phenylacetylene breaking its acetylenic bond and forming C-Cu bond(s) with the underlying copper atoms, and hence stand on the substrate. By comparing the nc-AFM simulations with the experimental observation, we identify the standing adsorption configuration of phenylacetylene on Cu (111). Our work demonstrates an application of combining nc-AFM measurements and DFT calculations to the study of standing molecules on substrates, which enriches our knowledge of the adsorption behaviors of small molecules on solid surfaces at low temperatures.

关键词: phenylacetylene, adsorption configuration, scanning probe microscopy, density functional theory

Abstract:

The adsorption configurations of molecules adsorbed on substrates can significantly affect their physical and chemical properties. A standing configuration can be difficult to determine by traditional techniques, such as scanning tunneling microscopy (STM) due to the superposition of electronic states. In this paper, we report the real-space observation of the standing adsorption configuration of phenylacetylene on Cu (111) by non-contact atomic force microscopy (nc-AFM). Deposition of phenylacetylene at 25 K shows featureless bright spots in STM images. Using nc-AFM, the line features representing the C-H and C-C bonds in benzene rings are evident, which implies a standing adsorption configuration. Further density functional theory (DFT) calculations reveal multiple optimized adsorption configurations with phenylacetylene breaking its acetylenic bond and forming C-Cu bond(s) with the underlying copper atoms, and hence stand on the substrate. By comparing the nc-AFM simulations with the experimental observation, we identify the standing adsorption configuration of phenylacetylene on Cu (111). Our work demonstrates an application of combining nc-AFM measurements and DFT calculations to the study of standing molecules on substrates, which enriches our knowledge of the adsorption behaviors of small molecules on solid surfaces at low temperatures.

Key words: phenylacetylene, adsorption configuration, scanning probe microscopy, density functional theory

中图分类号:  (Chemisorption/physisorption: adsorbates on surfaces)

  • 68.43.-h
68.43.Fg (Adsorbate structure (binding sites, geometry)) 07.79.-v (Scanning probe microscopes and components) 31.15.E (Density-functional theory)