A Combined Surface-Enhanced Raman–X-Ray Photoelectron Spectroscopic Study of 2-mercaptobenzothiazole Monolayers on Polycrystalline Au and Ag Films
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
A Combined Surface-Enhanced Raman–X-Ray Photoelectron
Spectroscopic Study of 2-mercaptobenzothiazole
Monolayers on Polycrystalline Au and Ag Films
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| Creator |
Sandhyarani, N.
Skanth, G. Sheela, B. Yegnaraman, V. Pradeep, T. |
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| Subject |
Electrodics and Electrocatalysis
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| Description |
The monolayers of 2-mercaptobenzothiazole (MBT) on polycrystalline
Au and Ag films have been studied by surface-enhanced
Raman (SERS) and X-ray photoelectron (XPS) spectroscopies.
Whereas MBT adsorbs with its molecular plane flat on Ag,
its plane is perpendicular on Au. This difference in adsorbate
geometry is manifested as differences in the intensities of certain
vibrational peaks in the Raman spectra. Ab initio molecular orbital
(MO) calculations suggest that MBT adsorbs on Au in the
thione form and on Ag in the thiol form. The monolayers are stable
up to a temperature of 473 K, much higher than most of the
self-assembled monolayers (SAMs) studied so far. The adsorption
geometry does not undergo any significant change when the monolayers
are heated, although minor changes are observed in the SER
spectra of the Ag monolayer. Raman intensities of all the bands
increase with heating, and the enhanced intensity is preserved
even after cooling. This is attributed to monolayer-induced coalescence
of gold islands leading to the formation of an extended
self-assembly. XPS studies confirm chemisorption, although structural
details are not manifested.
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| Publisher |
Elsevier
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| Date |
1999
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/1269/1/90-1999.pdf
Sandhyarani, N. and Skanth, G. and Sheela, B. and Yegnaraman, V. and Pradeep, T. (1999) A Combined Surface-Enhanced Raman–X-Ray Photoelectron Spectroscopic Study of 2-mercaptobenzothiazole Monolayers on Polycrystalline Au and Ag Films. Journal of Colloid and Interface Science, 209. pp. 154-161. ISSN 0021-9797 |
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| Relation |
http://cecri.csircentral.net/1269/
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