Dipole and charge effects of chloroaluminum phthalocyanine revealed by local work function measurements at sub-molecular level  

作　　者：Huanjun Song Na Li Hao Zhu Zhantao Peng Wenhui Zhao Haoran Chen Wei Chen Yongfeng Wang Kai Wua 

机构地区：[1]BNLMS, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China [2]Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China [3]Department of Chemistry, National University of Singapore, Singapore 117543, Singapore

出　　处：《Chinese Chemical Letters》2018年第3期429-432,共4页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos. 91527303, 21333001,21373020, 61321001);MOST(Nos.2013CB933404,2014CB239302),China

摘　　要：Work function plays a significant role in surface chemistry. Local work function provides the information of local d/pole-d/pole interaction and charge distribution between adsorbates and substrate, highlighting the local charge effect of the targeted spot which is normally smeared out in conventional average work function measurements. Chloroaluminum phthalocyanine （CIA1Pc）, an important optoelectronic molecule with a permanent dipole moment pointing from the Pc ring to the ending CI atom, adsorbed on Au（111） in either Cl-up or Cl-down configuration. Scanning tunneling microscopy/spectroscopy measurements revealed that at the centers of Cl-up and CI-down molecules, the local work functions changed oppositely with respect to the Au（111） substrate. At their Pc lobes, however, the local work functions unanimously increased due to charging effect of the indole lobes in the CIAIPc molecule.Work function plays a significant role in surface chemistry. Local work function provides the information of local d/pole-d/pole interaction and charge distribution between adsorbates and substrate, highlighting the local charge effect of the targeted spot which is normally smeared out in conventional average work function measurements. Chloroaluminum phthalocyanine （CIA1Pc）, an important optoelectronic molecule with a permanent dipole moment pointing from the Pc ring to the ending CI atom, adsorbed on Au（111） in either Cl-up or Cl-down configuration. Scanning tunneling microscopy/spectroscopy measurements revealed that at the centers of Cl-up and CI-down molecules, the local work functions changed oppositely with respect to the Au（111） substrate. At their Pc lobes, however, the local work functions unanimously increased due to charging effect of the indole lobes in the CIAIPc molecule.

关 键 词：Chloroaluminum phthalocyanine Local work function Dipole orientation Scanning tunneling microscopy Surface dipole 

分 类 号：O621.2[理学—有机化学]