Hidden electrochemistry in the thermal grafting of silicon surfaces from grignard reagents

Langmuir : the ACS Journal of Surfaces and Colloids
Samira FellahJean-Noël Chazalviel

Abstract

Covalent grafting of alkyl chains on silicon can be obtained by thermal treatment in Grignard reagents. Alkyl halide present in the Grignard solution as an impurity appears to play a key role in the grafting process. Grafting efficiency is improved when the alkyl halide concentration is increased. It is also enhanced on n-type substrates as compared to p-type substrates and when alkyl bromides are present in solution rather than alkyl chlorides. The grafting reaction involves a zero-current electrochemical step. A reaction model in which simultaneous Grignard oxidation and alkyl halide reduction take place at the silicon surface accounts for all these observations. Alkyl halide reduction is the rate-determining step. Negative charging of the silicon surface lowers the energetic barrier for this reaction, allowing for efficient grafting on n-Si.

References

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Citations

Sep 18, 2013·Journal of Colloid and Interface Science·Marvin Ustaris HerreraHiroyuki Sugimura
May 12, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Simone CiampiJ Justin Gooding
Mar 22, 2014·Physical Chemistry Chemical Physics : PCCP·Simone CiampiJ Justin Gooding
Jun 10, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Esther FrederickSteven L Bernasek
Mar 1, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Sabrina L PeczonczykStephen Maldonado
Apr 20, 2011·Chemical Society Reviews·Daniel Bélanger, Jean Pinson
Jan 14, 2016·Physical Chemistry Chemical Physics : PCCP·O PlucheryF Rochet
Aug 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Akihito ImanishiYoshihiro Nakato
Jul 16, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·F YangJ Rappich
Sep 3, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Sri Sai S VeguntaJohn C Flake
Apr 8, 2006·The Journal of Physical Chemistry. B·Taro YamadaAnd Maki Kawai

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