In situ FTIR experimental results in the silylation of low-k films with hexamethyldisilazane dissolved in supercritical carbon dioxide

Eduardo Vyhmeister, Lorenzo Reyes-Bozo, Héctor Valdés-González, José Luis Salazar, Anthony Muscat, L. Antonio Estévez, David Suleiman

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

In situ Fourier Transform Infrared Spectroscopy measurements were performed using an innovative equipment to study the surface modification reaction between a functionalized porous MSQ-film and hexamethyldisilazane (HMDS) dissolved in CO2 at supercritical conditions (scCO2). scCO2 was used in the heterogeneous reaction due to enhancing properties, ideal for porous materials. Different infrared signatures, from the gas and solid phases, were observed and identified, implying gas-gas and solid-gas phase reactions. Among the different component signatures observed in the gas phase, carbonic acid was observed as a possible silylating gas phase nucleophilic component, while in the solid phase the predominant reaction mechanism proceeded by forming SiOSi bonds and Trimethylaminosilane (as gas phase product).

Original languageEnglish (US)
Pages (from-to)134-143
Number of pages10
JournalJournal of Supercritical Fluids
Volume90
DOIs
StatePublished - Jun 2014

Keywords

  • HMDS
  • Heterogeneous reaction
  • In situ FTIR
  • Low-k
  • Silylation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'In situ FTIR experimental results in the silylation of low-k films with hexamethyldisilazane dissolved in supercritical carbon dioxide'. Together they form a unique fingerprint.

  • Cite this