Dynamical exchange behavior in organic monolayers studied by STM analysis of labeled mixtures

被引:47
作者
Stevens, F [1 ]
Beebe, TP [1 ]
机构
[1] Univ Utah, Dept Chem, Salt Lake City, UT 84112 USA
关键词
D O I
10.1021/la980416e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
By using mixtures of molecules which are sterically similar but contain functional groups with differing electronic properties, we have obtained scanning tunneling microscopy (STM) images of domains of randomly mixed monolayers of organic molecules on graphite, and the different molecules could be distinguished by STM. It was determined that molecules in the centers of the domains could still exchange readily with the solution, something which could not be determined using monolayers with single-component domains. The typical residence time of a molecule in the monolayers appeared to be between 0.2 and 20 s, and some variation was observed for different mixtures. We have also shown one case in which the composition of the adsorbed monolayer appears to be nearly independent of the composition of the bulk solution over almost 3 orders of magnitude. Although the mixture components could often be distinguished by STM, other times little or no difference was observed, even when image resolution appeared to be quite good in general. This suggests that the factors leading to STM contrast in organic molecules are complex, and the quest for reliable functional group identification by STM may be more difficult than expected.
引用
收藏
页码:6884 / 6889
页数:6
相关论文
共 31 条
[1]  
CANET D, 1995, J TRACE MICROPROBE T, V13, P361
[2]   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
[3]   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
[4]   Functional group identification in scanning tunneling microscopy of molecular adsorbates [J].
Cyr, DM ;
Venkataraman, B ;
Flynn, GW ;
Black, A ;
Whitesides, GM .
JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (32) :13747-13759
[5]   Self-assembly of a two-component hydrogen-bonded network: Comparison of the two-dimensional structure observed by scanning tunneling microscopy and the three-dimensional crystal lattice [J].
EichhorstGerner, K ;
Stabel, A ;
Moessner, G ;
Declerq, D ;
Valiyaveettil, S ;
Enkelmann, V ;
Mullen, K ;
Rabe, JP .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1996, 35 (13-14) :1492-1495
[6]   Theoretical description of the STM images of alkanes and substituted alkanes adsorbed on graphite [J].
Faglioni, F ;
Claypool, CL ;
Lewis, NS ;
Goddard, WA .
JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (31) :5996-6020
[7]   Scanning tunneling microscopy of molecular adsorbates at the liquid-solid interface: Functional group variations in image contrast [J].
Giancarlo, L ;
Cyr, D ;
Muyskens, K ;
Flynn, GW .
LANGMUIR, 1998, 14 (06) :1465-1471
[8]   Molecular organization of azobenzene derivatives at the liquid/graphite interface observed with scanning tunneling microscopy [J].
Grim, PCM ;
Vanoppen, P ;
Rucker, M ;
DeFeyter, S ;
Valiyaveettil, S ;
Moessner, G ;
Mullen, K ;
DeSchryver, FC .
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 1997, 15 (04) :1419-1424
[9]   SCANNING-TUNNELING-MICROSCOPY OF VARIOUS ALKANOLS AND AN ALKANETHIOL ADSORBED ONTO GRAPHITE [J].
GUNNING, AP ;
KIRBY, AR ;
MALLARD, X ;
MORRIS, VJ .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1994, 90 (17) :2551-2554
[10]   ORDERED STRUCTURE FORMED BY BIOLOGICALLY RELATED MOLECULES [J].
HATTA, I ;
NISHINO, J ;
SUMI, A ;
HIBINO, M .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1995, 34 (7B) :3930-3936