Abstract
A method Is herein described for the In situ detection of species adsorbed on electrode surfaces which employs a vibrating grating to modulate the wavelength of the Incident light. This technique denoted as reflection absorption wavelength mod ulation spectroscopy (RAWMS) has made It possible to obtain at a fixed electrode potential normalized, differential UV-vislble spectra of a single, Irreversibly adsorbed monolayer of cobalt tetrasulfonated phthalocyanine (CoIITsPc) on the basal plane of highly oriented pyrolytic graphite (HOPG(bp)) and of methylene blue (MB) on graphite. The (wavelength) Integrated difference RAWMS spectra for these adsorbed species were remarkably similar to those observed for the same compounds in aqueous solutions when present In the monomeric form. Complementary wavelength modulation experiments Involving a conventional transmission geometry have shown that the Instrument Involved In the In situ RAWMS measurements Is capable of resolving absorbance changes on the order of 0.002 units.
| Original language | English |
|---|---|
| Pages (from-to) | 3091-3095 |
| Number of pages | 5 |
| Journal | Analytical chemistry |
| Volume | 64 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 1992 Jan 1 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Analytical Chemistry
Cite this
In Situ UV-Visible Reflection Absorption Wavelength Modulation Spectroscopy of Species Irreversibly Adsorbed on Electrode Surfaces. / Kim, Sunghyun; Scherson, Daniel Alberto.
In: Analytical chemistry, Vol. 64, No. 24, 01.01.1992, p. 3091-3095.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - In Situ UV-Visible Reflection Absorption Wavelength Modulation Spectroscopy of Species Irreversibly Adsorbed on Electrode Surfaces
AU - Kim, Sunghyun
AU - Scherson, Daniel Alberto
PY - 1992/1/1
Y1 - 1992/1/1
N2 - A method Is herein described for the In situ detection of species adsorbed on electrode surfaces which employs a vibrating grating to modulate the wavelength of the Incident light. This technique denoted as reflection absorption wavelength mod ulation spectroscopy (RAWMS) has made It possible to obtain at a fixed electrode potential normalized, differential UV-vislble spectra of a single, Irreversibly adsorbed monolayer of cobalt tetrasulfonated phthalocyanine (CoIITsPc) on the basal plane of highly oriented pyrolytic graphite (HOPG(bp)) and of methylene blue (MB) on graphite. The (wavelength) Integrated difference RAWMS spectra for these adsorbed species were remarkably similar to those observed for the same compounds in aqueous solutions when present In the monomeric form. Complementary wavelength modulation experiments Involving a conventional transmission geometry have shown that the Instrument Involved In the In situ RAWMS measurements Is capable of resolving absorbance changes on the order of 0.002 units.
AB - A method Is herein described for the In situ detection of species adsorbed on electrode surfaces which employs a vibrating grating to modulate the wavelength of the Incident light. This technique denoted as reflection absorption wavelength mod ulation spectroscopy (RAWMS) has made It possible to obtain at a fixed electrode potential normalized, differential UV-vislble spectra of a single, Irreversibly adsorbed monolayer of cobalt tetrasulfonated phthalocyanine (CoIITsPc) on the basal plane of highly oriented pyrolytic graphite (HOPG(bp)) and of methylene blue (MB) on graphite. The (wavelength) Integrated difference RAWMS spectra for these adsorbed species were remarkably similar to those observed for the same compounds in aqueous solutions when present In the monomeric form. Complementary wavelength modulation experiments Involving a conventional transmission geometry have shown that the Instrument Involved In the In situ RAWMS measurements Is capable of resolving absorbance changes on the order of 0.002 units.
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U2 - 10.1021/ac00048a005
DO - 10.1021/ac00048a005
M3 - Article
AN - SCOPUS:0000604483
VL - 64
SP - 3091
EP - 3095
JO - Analytical Chemistry
JF - Analytical Chemistry
SN - 0003-2700
IS - 24
ER -