Characterization of 11-mercaptoundecanoic and 3-mercaptopropionic acids adsorbed on silver by surface-enhanced Raman scattering |
| |
| Institution: | 1. Agri-Chemistry Group, School of Medical and Applied Sciences, Central Queensland University (CQU), Bruce Highway, North Rockhampton, Queensland, 4701, Australia;2. School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;1. Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Viale D’Alcontres 31, 98166, Messina, Italy;2. Laboratoire de Chimie Physique, UMR8000, Université Paris Sud, 91405, Orsay cedex, France;3. ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxon, OX11 0QX, UK;4. Department of Chemistry and Biochemistry, Texas Tech University, Box 41061, Lubbock, TX 79409, USA;5. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA;6. Department of Mathematical and Informatics Sciences, Physical Sciences and Earth Sciences, University of Messina, Viale D’Alcontres 31, 98166, Messina, Italy;1. Department of Chemistry ‘Ugo Schiff’, University of Florence, Scientific Campus, via della Lastruccia 3-13, 50019 Sesto F.no, Italy;2. European Laboratory for Non Linear Spectroscopy (LENS), University of Florence, Scientific Campus, via N. Carrara 1, 50019 Sesto F.no, Italy;3. Department of Photonics, Saint Petersburg Electrotechnical University, Ul. Professora Popova 5, 197376 St. Petersburg, Russia;1. Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550081, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Earth Sciences, Academia Sinica, Taipei 115, Taiwan;1. Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Mangiagalli 34, 20133, Milano, Italy;2. Consiglio Nazionale delle Ricerche, Istituto per la Conservazione e la Valorizzazione dei Beni Culturali (ICVBC), Via Cozzi 53, 20125, Milano, Italy;3. Bruker Italia S.r.l. Unipersonale, V. le V. Lancetti 43, 20158, Milano, Italy;1. Departamento de Física, Universidade Tecnológica Federal do Paraná, Campus Ponta Grossa, Avenida Monteiro Lobato 1787, 84.016-210, Ponta Grossa, Paraná, Brazil;2. Departamento de Física, Universidade Estadual de Ponta Grossa, Av. Gen. Carlos Cavalcanti 4748, 84.030-000, Ponta Grossa, Paraná, Brazil |
| |
| Abstract: | Functionalized n-alkanethiols such as 11-mercaptoundecanoic (MUA) and 3-mercaptopropionic (MPA) acids are likely to adsorb in silver nanoparticles (AgNPs) solely through the thiol group (-SH) or also involving the carboxylate group (?COO?) in their structures. The relative tendency is closely related to pH conditions, solvent or the surface potential of the metallic nanoparticles. The SERS effect (Surface Enhancement Raman Scattering) was used for improving the understanding of MUA and MPA group interaction as well as the orientation of these organic compounds adsorbed on AgNPs and the influence of Cu(II) in solution. When analyzing the MPA SERS spectrum, it was verified that the thiol moiety was preferred to adsorb on the AgNPs surface in the thiolate form, presenting both anti and gauche conformations in both acidic and basic media. MUA SERS spectrum however, indicated that solely an anti conformation for the thiol moiety adsorbed on the AgNPs surface in both acidic and basic media. Adding Cu2+ ion resulted in coordination to the carboxyl or carboxylate moieties was confirmed by the downshift of the band assigned to OCO stretching. The presence of Cu(II) increased the tendency of gauche conformation for MPA; the coordination of MUA to Cu(II) resulted in a more upright conformation of the carboxylic/carboxylate moieties in both acidic and basic media, respectively. |
| |
| Keywords: | MUA MPA Silver nanoparticles SERS Organothiols |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
