Surface-Enhanced Raman Scattering (SERS) Spectroscopy with Borohydride-Reduced Silver Colloids: Controlling Adsorption of the Scattering Species by Surface Potential of Silver Colloid

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Title:Surface-Enhanced Raman Scattering (SERS) Spectroscopy with Borohydride-Reduced Silver Colloids: Controlling Adsorption of the Scattering Species by Surface Potential of Silver Colloid
Creators:
Čermáková, Kateřina
Šesták, Ondřej
Matějka, Pavel
Baumruk, Vladimír
Vlčková, Blanka
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 58, 11, pp. 2682-2694

Abstract

Formation of Ag colloid/adsorbate SERS-active systems (upon adsorption of the selected adsorbates on the surface of Ag colloidal particles) as a function of (i) NaBH<sub>4</sub> to AgNO<sub>3</sub> molar ratio in the preparation protocol of Ag colloid, and (ii) aging of the colloid has been investigated by Surface-enhanced Raman scattering (SERS) spectroscopy. Oligomeric synthetic polypeptides, bovine serum albumin, phosphate coadsorbed with CuTMePyP [copper(II) derivative of 5,10,15,20-tetrakis-(<i>N</i>-methylpyridinium-4-yl)porphyrin chloride] and borates in systems with N-containing bases were selected as model adsorbates. Both (i) a decrease of NaBH<sub>4</sub> to AgNO<sub>3</sub> molar ratio upon preparation and (ii) aging of Ag colloid affect adsorption of the adsorbates and consequently, their SERS spectra, in the same manner. Aging of Ag colloid is thus viewed as a slow hydrolysis of BH<sub>4</sub><sup>-</sup> anions. The actual concentration of BH<sub>4</sub><sup>-</sup> in the system is identified as the most important factor controlling adsorption of all the selected adsorbates on the surface of Ag colloid. As this factor can be related to the surface potential, the conditions controlling adsorption of the selected adsorbates are specified in terms of a more negative and/or more positive surface potential of Ag colloidal particles. A more positive surface potential promotes adsorption of polypeptides, bovine serum albumin and phosphate while observation of spectral features of borates in the SERS spectra of N-containing bases in alkaline solutions is conditioned by a more negative surface potential.

Title:Surface-Enhanced Raman Scattering (SERS) Spectroscopy with Borohydride-Reduced Silver Colloids: Controlling Adsorption of the Scattering Species by Surface Potential of Silver Colloid
Creators:
Čermáková, Kateřina
Šesták, Ondřej
Matějka, Pavel
Baumruk, Vladimír
Vlčková, Blanka
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:58
Number:11
Page Range:pp. 2682-2694
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19932682UNSPECIFIED
ID Code:384
Item Type:Article
Deposited On:06 Feb 2009 17:00
Last Modified:06 Feb 2009 16:00

Citation

Čermáková, Kateřina; Šesták, Ondřej; Matějka, Pavel; Baumruk, Vladimír; Vlčková, Blanka (1993) Surface-Enhanced Raman Scattering (SERS) Spectroscopy with Borohydride-Reduced Silver Colloids: Controlling Adsorption of the Scattering Species by Surface Potential of Silver Colloid. Collection of Czechoslovak Chemical Communications, 58 (11). pp. 2682-2694. ISSN 0010-0765

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