Quantitative infrared investigation of the acido-basic equilibrium at a carboxy-terminated silicon surface

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Abstract

Silicon surfaces grafted with mixed alkyl/carboxylic acid monolayers have been investigated by in-situ quantitative infrared spectroscopy at the contact with electrolytes of various PH. Ionization of the carboxy groups is found to start around PH 6 and to extend over a wide pH range. Ionization is not complete even at PH 11. These observations point to the importance of the interactions between surface charges. This effect may be accounted for by a simple model taking into account the change in the Helmholtz potential associated with the surface charge. However, the agreement is only qualitative, which indicates that the surface charge is screened more efficiently than expected, possibly due to ion penetration between the carboxy groups.

Original languageEnglish
Title of host publicationECS Transactions - 46th State-of-the-Art Program on Compound Semiconductors (SOTAPOCS XLVI) and the 2nd International Symposium on Processes at the Semiconductor-Solution Interface
PublisherElectrochemical Society Inc.
Pages475-479
Number of pages5
Edition2
ISBN (Electronic)9781566775519
ISBN (Print)9781566775519
DOIs
Publication statusPublished - 1 Jan 2007
Event46th State-of-the-Art Program on Compound Semiconductors (SOTAPOCS XLVI) and the 2nd International Symposium on Processes at the Semiconductor-Solution Interface - 211th ECS Meeting - Chicago, IL, United States
Duration: 6 May 200710 May 2007

Publication series

NameECS Transactions
Number2
Volume6
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

Conference46th State-of-the-Art Program on Compound Semiconductors (SOTAPOCS XLVI) and the 2nd International Symposium on Processes at the Semiconductor-Solution Interface - 211th ECS Meeting
Country/TerritoryUnited States
CityChicago, IL
Period6/05/0710/05/07

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