Influence of asymmetric adsorption on electronic states of molecule studied by scanning tunneling microscopy and spectroscopy

被引：4

作者：

Li, YiBao ^{[1
]}

Wan, JunHua ^{[2
]}

Qi, Guicun ^{[1
]}

Deng, Ke ^{[1
]}

Yang, Yanlian ^{[1
]}

Zeng, Qingdao ^{[1
]}

Huang, Wei ^{[1
,3
]}

Wang, Chen ^{[1
]}

机构：

[1] Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China

[2] Hangzhou Normal Univ, Key Lab Organosilicon Chem & Mat Technol, Minist Educ, Hangzhou 310012, Zhejiang, Peoples R China

[3] Nanjing Univ Posts & Telecommun, IAM, Nanjing 210003, Peoples R China

来源：

CHEMICAL PHYSICS LETTERS | 2009年 / 474卷 / 1-3期

基金：

中国国家自然科学基金;

关键词：

STM IMAGES; PHTHALOCYANINES; VISUALIZATION; INTERFACE; CONTRAST; ACCEPTOR;

D O I：

10.1016/j.cplett.2009.04.034

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electronic states of unique molecule (Py-Per-Py), composed of two pyrene (Py1 and Py2) units, were investigated by using scanning tunneling microscopy and spectroscopy (STM/STS) at the liquid/solid interface. Bias-polarity-dependence of STM images of the Py1 and Per moieties were observed. STS results revealed that the apparent energy gaps for the Py1 and the Py2 were appreciably different due to possible asymmetric adsorption configurations. The apparent energy gap for the Per moiety measured by STS was in agreement with the hybrid density functional theory (DFT) simulations. In a parallel study, another molecule (Py-e-Per-e-Py) was also studied by using STM/ STS for further confirmation of the proposed mechanism. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：132 / 136

页数：5

共 40 条

[1] FAST PHOTOCONDUCTION IN THE HIGHLY ORDERED COLUMNAR PHASE OF A DISCOTIC LIQUID-CRYSTAL [J].

ADAM, D ;

SCHUHMACHER, P ;

SIMMERER, J ;

HAUSSLING, L ;

SIEMENSMEYER, K ;

ETZBACH, KH ;

RINGSDORF, H ;

HAARER, D .

NATURE, 1994, 371 (6493) :141-143

[2] MOLECULAR RECTIFIERS [J].

AVIRAM, A ;

RATNER, MA .

CHEMICAL PHYSICS LETTERS, 1974, 29 (02) :277-283

[3] A MULTICENTER NUMERICAL-INTEGRATION SCHEME FOR POLYATOMIC-MOLECULES [J].

BECKE, AD .

JOURNAL OF CHEMICAL PHYSICS, 1988, 88 (04) :2547-2553

[4]

Carroll RL, 2002, ANGEW CHEM INT EDIT, V41, P4379, DOI 10.1002/1521-3773(20021202)41:23<4378::AID-ANIE4378>3.0.CO

[5]

2-A

[6] Scanning tunneling microscopy imaging of small adsorbed molecules on metal surfaces in an ultrahigh vacuum environment [J].

Chiang, S .

CHEMICAL REVIEWS, 1997, 97 (04) :1083-1096

[7] Source of image contrast in STM images of functionalized alkanes on graphite: A systematic functional group approach [J].

Claypool, CL ;

Faglioni, F ;

Goddard, WA ;

Gray, HB ;

Lewis, NS ;

Marcus, RA .

JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (31) :5978-5995

[8] Computational Modeling for scanning tunneling microscopy of physisorbed molecules via ab initio quantum chemistry [J].

Crystal, J ;

Zhang, LY ;

Friesner, RA ;

Flynn, GW .

JOURNAL OF PHYSICAL CHEMISTRY A, 2002, 106 (09) :1802-1814

[9] STM investigations of organic molecules physisorbed at the liquid-solid interface [J].

Cyr, DM ;

Venkataraman, B ;

Flynn, GW .

CHEMISTRY OF MATERIALS, 1996, 8 (08) :1600-1615

[10] Two-dimensional supramolecular self-assembly probed by scanning tunneling microscopy [J].

De Feyter, S ;

De Schryver, FC .

CHEMICAL SOCIETY REVIEWS, 2003, 32 (03) :139-150

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