Surface chemistry of polyimide precursors on Cu(111) |
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| Institution: | 1. Department of Chemical Engineering, University of Maryland, College Park, MD 20742, USA;2. Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA;3. Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA;1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;2. National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China;1. Department of Chemical Physics, Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Anhui Key Laboratory of Biomass Clean Energy, University of Science & Technology of China, Hefei 230026, PR China;2. Anhui Key Laboratory of Tobacco Chemistry, Anhui Tobacco Industrial Co., Ltd., 9 Tianda Road, Hefei 230088, PR China |
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| Abstract: | We have investigated the bonding of the monomers pyromellitic dianhydride (PMDA) and oxydianiline (ODA) as well as model compounds, succinic anhydride, phthalic anhydride, and benzoic acid, on Cu(111) in ultrahigh vacuum. Unenhanced surface Raman spectroscopy was used to identify the adsorbed species. ODA was unreactive at 110 K; the surface vibrational features were identical to those in the condensed multilayer. In contrast, PMDA chemisorbed dissociatively to form a bidentate surface carboxylate. Succinic anhydride physisorbed at 110 K, whereas benzoic acid and phthalic anhydride both adsorbed dissociatively forming bridging surface carboxylates as was observed for PMDA. The surface Raman spectrum of PMDA showed resonance enhancement. |
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