Surface-enhanced Raman scattering characteristics of 4-nitrobenzenethiol adsorbed on palladium and silver thin films |
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| Institution: | 1. Department of Chemistry, Soongsil University, Seoul 156-743, Republic of Korea;2. Department of Chemistry, Seoul National University, Seoul 151-742, Republic of Korea;1. Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Maceió, AL, 57072-970, Brazil;2. Instituto Federal de Educação, Ciência e Tecnologia de Alagoas, IFAL, 57020-600 Maceió, AL, Brazil;3. Instituto Federal de Educação, Ciência e Tecnologia de Alagoas, IFAL, Satuba, AL, Brazil;4. Departamento de Química, Universidade Federal da Paraíba, Campus I, 58059-900 João Pessoa-PB, Brazil;1. Department of Physics, Faculty of Mathematics and Natural Sciences, University of Sumatera Utara, Medan 20155, Indonesia;2. Department of Physics Education, Faculty of Teacher Training and Education, University of HKBP Nommensen, Medan 20234, Indonesia;1. Department of Chemistry, National Tsing Hua University, Hsinchu, 30013, Taiwan, ROC;2. Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, 30013, Taiwan, ROC;1. Faculty of Foundry Engineering, AGH University of Science and Technology, ul. Reymonta 23, 30-059 Kraków, Poland;2. Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Republic of Korea |
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| Abstract: | Palladium is an important catalytic metal, and it is desirable to develop a surface-enhanced Raman scattering (SERS) technique to investigate the reagent and product species adsorbed on its surface. Unfortunately, Pt-group metals, e.g., Pt and Pd, have been commonly considered as non- or weak-SERS-active substrates. In this work, Ag and Pd thin films were deposited very efficiently and evenly onto the surface of glass substrates by using only corresponding metal nitrate salts (AgNO3 and Pd(NO3)2) with butylamine in ethanolic solutions. In this process, pure ethanol was used for Ag deposition, while an ethanol–water (8:2) mixture was used for Pd deposition. The as-prepared Ag and Pd films exhibited SERS activity over a large area. The surface-induced photoconversion capabilities of these Ag and Pd films were then tested on 4-nitrobenzenethiol by means of SERS. It was found that at least under visible laser irradiation, the surface-catalyzed photoreaction occurs more readily on a Ag film than on a Pd film for the conversion of 4-nitrobenzenethiol to 4-aminobenzenethiol, even though Pd is known to be an important transition metal with high catalytic activity. |
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| Keywords: | Surface-enhanced Raman scattering 4-Nitrobenzenethiol Photoconversion Ag thin film Pd thin film |
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