Photoelectron spectroscopy study of irradiation damage and metal–sulfur bonds of thiol on silver and copper surfaces |
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| Institution: | 1. Laboratory of Materials Science, Department of Physics, University of Turku, FI-20014 Turku, Finland;2. Graduate School of Materials Research, Turku, Finland;3. Department of Chemistry, University of Turku, FI-20014 Turku, Finland;1. Department of Biotechnology, NIMS University, Jaipur, India;2. Faculty of Medicine in Hradec Kralove, University of Charles, Prague, Czech Republic;3. Department of Biotechnology, N.C. College of Engineering, Israna, India;4. Department of Biotechnology, Deenbandhu Chotu Ram University of Science and Technology, Murthal, India;5. Department of Biotechnology, Meerut Institute of Engineering and Technology, Meerut, India;1. Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea;2. Agency for Defense Development, Bugyuseong-daero 488 beon-gil 160 (Sunam-dong 111), Daejeon 305-152, South Korea;1. State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, China National Petroleum Corporation (CNPC), China University of Petroleum (East China), Qingdao 266580, Shandong, China;2. Department of Chemistry, Tsinghua University, Beijing 100084, China;1. College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China;2. National Engineering Technology Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, Sichuan, China;3. Istanbul Technical University, Chemical and Metallurgical Engineering Faculty, Chemical Engineering Department, 34469 Maslak, Istanbul, Turkey |
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| Abstract: | Self-assembled 1-dodecanethiol monolayers (SAMs) on silver and copper surfaces have been characterized with X-ray photoelectron spectroscopy (XPS) using both the synchrotron radiation and conventional Mg Kα excitation. Irradiation-induced changes in thiolate SAMs on Cu and Ag were observed. The identification of the sulfur species has been done. Results obtained confirm earlier studies of n-alkanethiols on silver. On copper (C12S/Cu), the observed S 2p spectrum is quite broad but the use of different excitation energies enabled us to identify four sulfur species on the surface. A S 2p3/2 component of copper thiolate is observed at 162.6 eV. Three more doublets (161.9 eV, 163.2 eV and 163.8 eV) have been observed to develop during irradiation and they are assigned to chemisorbed sulfur on copper, to different dialkylsulfides and to sulfur–sulfur bonding. |
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