Coadsorption of Formic Acid and Hydrazine on Cu(110) Single-Crystal Surfaces
Journal Article
·
· Journal of Physical Chemistry. C
- Univ. of California, Riverside, CA (United States). Dept. of Chemistry; University of California
- Nacional Autonoma de Mexico (UNAM), Baja California (Mexico). Centro de Nanociencias y Nanotecnología
- Univ. of California, Riverside, CA (United States); Nacional Autonoma de Mexico (UNAM), Baja California (Mexico). Centro de Nanociencias y Nanotecnología
- Univ. of California, Riverside, CA (United States). Dept. of Chemistry
The chemistry of coadsorbed formic acid and hydrazine on Cu(110) surfaces was characterized both experimentally, by temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS), and theoretically, via density functional theory (DFT) calculations. It was found that the two reactants interact with each other via hydrogen bonds, and that this modifies their individual thermal chemistry on the surface in two main ways: by stabilizing a HCOOH:N2H4 adduct, which desorbs molecularly at around 240 K, and by slightly delaying the decomposition of the hydrazine to higher temperatures and shifting the selectivity of that step from dehydrogenation and formation of N2Hx(ads) species to scission of the N–N bond and ammonia production. The coadsorbed formic acid was determined to react at higher temperatures than hydrazine, in chemistry not affected by the latter, which is no longer present on the surface at that stage. One interesting aspect of this chemistry revealed by the DFT calculations is that formic acid may preferentially H-bond on top of adsorbed hydrazine rather than directly attach to the copper surface. The implications of these results to atomic layer deposition (ALD) processes are discussed.
- Research Organization:
- Univ. of California, Riverside, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001839
- OSTI ID:
- 1593408
- Journal Information:
- Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 13 Vol. 123; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Role of oligomer structures in the surface chemistry of amidinate metal complexes used for atomic layer deposition of thin films
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