Adsorption of cysteamine at copper electrodes as studied by surface-enhanced Raman spectroscopy

被引：13

作者：

Bloxham, S ^{[1
]}

Eicher-Lorka, O ^{[1
]}

Jakubenas, R ^{[1
]}

Niaura, G ^{[1
]}

机构：

[1] Inst Chem, LT-2600 Vilnius, Lithuania

来源：

SPECTROSCOPY LETTERS | 2003年 / 36卷 / 03期

关键词：

surface enhanced Raman spectroscopy; SERS; cysteamine; copper;

D O I：

10.1081/SL-120024354

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The adsorption of cysteamine on a roughened polycrystalline copper electrode in acidic solution has been studied, in-situ, using surface-enhanced Raman spectroscopy (SERS). It was shown that gauche/trans rotational isomerization of the adsorbate depends on the solution concentration of cysteamine. Coadsorption of oxyanions (ClO4- and SO42-) with cysteamine has been detected spectroscopically. At relatively high cysteamine concentrations (10(-4) M) the physisorption of oxyanions was evidenced by a minor shift (within 5 cm(-1)) in the totally symmetric vibrational frequency, as compared with the solution species, and narrow bandwidth (16 cm(-1)). In contrast, the large downward frequency shift of coadsorbed SO42- ions (12 cm(-1)) and substantial broadening of the band (bandwidth, 29 cm(-1)) indicated chemisorption of the sulfate anions on the copper electrode at low cysteamine concentrations (10(-7) M).

引用

页码：211 / 226

页数：16

共 29 条

[1] IN-SITU SPECTROSCOPIC EVIDENCE FOR THE ADSORPTION OF SO4(2-) IONS AT A COPPER ELECTRODE IN SULFURIC-ACID-SOLUTION [J].