Expanding the repertoire of molecular linkages to silicon: Si–S, Si–Se, and Si–Te Bonds

  1. Available on April 7, 2017
  2. Get@NRC: Expanding the repertoire of molecular linkages to silicon: Si–S, Si–Se, and Si–Te Bonds (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/acsami.6b00784
AuthorSearch for: ; Search for: ; Search for:
Journal titleACS Applied Materials & Interfaces
SubjectSilicon; Surface; Chalcogenide; Sulfur; Selenium; Tellurium; Radical
AbstractSilicon is the foundation of the electronics industry and is now the basis for a myriad of new hybrid electronics applications, including sensing, silicon nanoparticle-based imaging and light emission, photonics, and applications in solar fuels, among others. From interfacing of biological materials to molecular electronics, the nature of the chemical bond plays important roles in electrical transport and can have profound effects on the electronics of the underlying silicon itself, affecting its work function, among other things. This work describes the chemistry to produce ≡Si–E bonds (E = S, Se, and Te) through very fast microwave heating (10–15 s) and direct thermal heating (hot plate, 2 min) through the reaction of hydrogen-terminated silicon surfaces with dialkyl or diaryl dichalcogenides. The chemistry produces surface-bound ≡Si–SR, ≡Si–SeR, and ≡Si–TeR groups. Although the interfacing of molecules through ≡Si–SR and ≡Si–SeR bonds is known, to the best of our knowledge, the heavier chalcogenide variant, ≡Si–TeR, has not been described previously. The identity of the surface groups was determined by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and depth profiling with time-of-flight-secondary ionization mass spectrometry (ToF-SIMS). Possible mechanisms are outlined, and the most likely, based upon parallels with well-established molecular literature, involve surface silyl radicals or dangling bonds that react with either the alkyl or aryl dichalcogenide directly, REER, or its homolysis product, the alkyl or aryl chalcogenyl radical, RE· (where E = S, Se, and Te).
Publication date
PublisherACS Publications
AffiliationNational Institute for Nanotechnology; National Research Council Canada
Peer reviewedYes
NPARC number23000356
Export citationExport as RIS
Report a correctionReport a correction
Record identifierc1c1a44d-27a8-422d-80b6-47aff6cbb712
Record created2016-07-08
Record modified2016-07-08
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)