Formation of organic thin films at the liquid-solid interface studied by second harmonic spectroscopy

被引：6

作者：

Buck, M ^{[1
]}

Dannenberger, O ^{[1
]}

Wolff, JJ ^{[1
]}

机构：

[1] INST ORGAN CHEM, D-69120 HEIDELBERG, GERMANY

来源：

THIN SOLID FILMS | 1996年 / 284卷

关键词：

second harmonic generation; self-assembling monolayers; thiols; in situ analysis;

D O I：

10.1016/S0040-6090(95)08350-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Self-assembly of omega-(p-nitroanilino)dodecane thiol (p-O2N-C6H4-NH-(CH2)(12)SH) (NAT) on polycrystalline gold films by adsorption from solution was studied in situ with second harmonic generation (SHG). Depending on the wavelength different parts of the system are probed. At a fundamental wavelength of 1064 nm thiol adsorption is monitored in real time by the formation of the sulfur-substrate bond. A linear dependence of the non-linear susceptibility from the thiol coverage describes the time-dependent SH signal quantitatively. In contrast, the nitroaniline (NA) end group measured at a SH wavelength of 350 nm exhibits a very different behavior, Phase-sensitive measurements carried out in situ reveal that an increase of the density of the film causes the phase of the SH signal from the NA moiety to advance. This phase shift which corresponds to a blue-shift of the resonance becomes effective for coverages higher than 0.4 and is explained by the repulsive interaction of the NAT molecules.

引用

页码：396 / 399

页数：4

共 17 条

[11] INSITU AND DYNAMIC MONITORING OF THE SELF-ASSEMBLING AND REDOX PROCESSES OF A FERROCENYLUNDECANETHIOL MONOLAYER BY ELECTROCHEMICAL QUARTZ CRYSTAL MICROBALANCE [J].