Phase contrast and attraction-repulsion transition in tapping mode atomic force microscopy

被引：33

作者：

Chen, X ^{[1
]}

Roberts, CJ ^{[1
]}

Zhang, J ^{[1
]}

Davies, MC ^{[1
]}

Tendler, SJB ^{[1
]}

机构：

[1] Univ Nottingham, Sch Pharmaceut Sci, Lab Biophys & Surface Anal, Nottingham NG7 2RD, England

来源：

SURFACE SCIENCE | 2002年 / 519卷 / 1-2期

基金：

英国工程与自然科学研究理事会;

关键词：

atomic force microscopy; surface energy; models of non-linear phenomena; biological compounds; mica; biological molecules - proteins;

D O I：

10.1016/S0039-6028(02)02217-3

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 origin of phase contrast in tapping mode (TM) atomic force microscopy (AFM) images has been a persistent issue of concern to many TM-AFM users. In the present study, it is revealed experimentally that phase contrast relates principally to large phase differences between regions of attractive and repulsive dominated probe-sample interactions at the attraction-repulsion transition point rather than variations in energy dissipation due to shifting probe-sample interactions. To provide a rational basis for characterizing phase contrast we demonstrate that the length of the attractive-dominated region in amplitude-phase-distance (apd) data can not only help to determine whether a reliable phase image can be obtained on a particular sample surface, but also provide a quantitative "fingerprint" for a sample surface. We term this quantity the attraction-dominated region length. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：L593 / L598

页数：6

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