Covalent molecular assembly in supercritical carbon dioxide: a comparative study between amine- and anhydride-derivatized surfaces

Langmuir : the ACS Journal of Surfaces and Colloids
Sreenivasa Reddy Puniredd, M P Srinivasan

Abstract

Layer-by-layer covalent assembly of an oligoimide on an anhydride- derivatized silicon dioxide surface is investigated using supercritical carbon dioxide (SCCO2) as the depositing medium. The deposited films were characterized by X-ray photoelectron spectroscopy (XPS), ellipsometry (VASE), UV-visible spectroscopy, electrochemical impedance spectroscopy, nano indentation, and atomic force microscopy (AFM) and the properties of the films compared with those of an oligoimide deposited on amine-derivatized surfaces. Films formed on the anhydride surface are more uniform and stable possibly because the silane precursor for the anhydride is anchored to the surface through two (-Si-O-Si-) tripods. XPS results indicate that the interfacial reaction resulting in amide formation is almost complete in the case of the anhydride, but not in the case of the amine. We infer that the twin tripods linking the anhydride group to the surface may have improved the accessibility of the functional groups for immobilization of the next layer, thereby contributing to the better quality.

References

Dec 20, 1996·Science·J B McClainR Triolo
Jun 20, 1996·Chemical Reviews·Abraham Ulman
Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Fengxiang Zhang, M P Srinivasan
Aug 11, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Sreenivasa Reddy Puniredd, M P Srinivasan
Apr 15, 2002·Angewandte Chemie·Michael C Pirrung

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Citations

Feb 3, 2009·Journal of Colloid and Interface Science·Sreenivasa Reddy PunireddM P Srinivasan
Jan 29, 2008·Journal of Colloid and Interface Science·Sreenivasa Reddy PunireddM P Srinivasan
Oct 19, 2006·Journal of Colloid and Interface Science·Sreenivasa Reddy Puniredd, M P Srinivasan
Nov 7, 2012·Journal of Colloid and Interface Science·Ruitao Zhou, M P Srinivasan
May 2, 2013·The Journal of Physical Chemistry Letters·Sreenivasa Reddy PunireddM P Srinivasan
Aug 21, 2014·Chemical Reviews·João Borges, João F Mano
May 15, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Zhiqiang Zhang, Yihui Wu
Jul 5, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Sreenivasa Reddy PunireddM P Srinivasan

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