Thermal reaction of trimethylphosphine and triethylphosphine on Cu(110)

Ying Huang Lai, Chuin Tih Yeh, Hong Ji Lin, Chien Te Chen, Wei-Hsiu Hung

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14 Citations (Scopus)

Abstract

Adsorption and thermal decomposition of trimethylphosphine (PMe3) and triethylphosphine (PEt3) on the Cu(110) surface are investigated using temperature-programmed desorption (TPD) and X-ray photoemission spectroscopy (XPS) with synchrotron radiation. Both PMe3 and PEt3 chemisorb molecularly on three adsorption sites on a Cu(110) surface at 100 K and are mostly desorbed intact upon annealing to 520 K. However, a fraction of chemisorbed PMe3 and PEt3 undergoes decomposition via dealkylation. Chemisorbed PEt3 undergoes thermal decomposition to a greater extent than PMe3. PMe3 molecules decompose thermally to form surface CH3 and phosphorus through PMe2 as an intermediate. Surface CH3 eventually disproportionates to form CH4 and surface carbon at a temperature above 420 K. Chemisorbed PEt3 molecules undergo stepwise deethylation (PEt3 → PEt2 → PEt → P), resulting in surface C2H5 and phosphorus; the surface C2H5 moiety further decomposes to evolve C2H4 and H2 through β-hydride elimination. Hence a Cu film grown from a CVD precursor containing PEt3 ligands is almost free of carbon, but however, may be deposited with a higher concentration of phosphorus, relative to PMe3.

Original languageEnglish
Pages (from-to)1722-1727
Number of pages6
JournalJournal of Physical Chemistry B
Volume106
Issue number7
DOIs
Publication statusPublished - 2002 Feb 21

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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