Atomic layer deposition of platinum thin films on anodic aluminium oxide templates as surface-enhanced Raman scattering substrates |
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| Affiliation: | 1. Department of Microelectronics, Fudan University, Shanghai 200433, China;2. Department of Physics, Southeast University, Nanjing 211189, China;3. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong;1. Institute of Clinical Medicine, National Yang-Ming University, School of Medicine, Taipei, Taiwan, R.O.C;2. Department of Pediatrics, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C;3. Department of Pediatrics, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C;4. School of Medicine, National Yang-Ming University, Taipei, Taiwan, R.O.C;5. Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C;1. Institut Charles Gerhardt, UMR 5253, Chimie Moléculaire et Organization du Solide, Place Eugène Bataillon, 34095Montpellier Cedex 5, France;2. Laboratoire de Chimie de Coordination Inorganique et Organométallique, Université Libanaise, Faculté des Sciences (I), Hadath, Lebanon;3. Institut Charles Gerhardt, UMR 5253, Dynamique et Adsorption dans les Matériaux Poreux, Place Eugène Bataillon, 34095 Montpellier, France;4. Institut Charles Gerhardt, UMR 5253, cc 1702, Ingénierie et Architectures Macromoléculaires, Place Eugène Bataillon, 34095 Montpellier, France;1. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China;2. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University,1239 Siping Road, Shanghai 200092, China;1. College of Chemistry, Chemical Engineering and Materials Science & Key Laboratory of Organic Synthesis of Jiangsu Province, Soochow University, SIP, Suzhou 215123, China;2. School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China;1. Physics, Lahore College for Women University, Lahore, Pakistan;2. CASP, Government College University, Lahore, Pakistan |
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| Abstract: | Platinum thin films are deposited on anodic aluminium oxide (AAO) templates by atomic layer deposition (ALD). The highly ordered island-like platinum nanostructures formed on the AAO template produce a high Raman scattering signal because of the periodical hexagonal arrangement. As an illustration, dramatic enhancement is achieved using Rhodamine 6G (R6G) as a molecular probe.Field-emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) show that the gap between the island-like structures is below 10 nm. Owing to activation by the incident laser beam, the localized electromagnetic field on the platinum island surface can be dramatically enhanced by the sub-10 nm regime subsequently amplifying the Raman signal. Finite-difference time-domain (FDTD) calculation matches the experimental phenomena suggesting that the excellent surface-enhanced Raman scattering (SERS) characteristics of the platinum structure arise from the high density and abundance of hot spots. Because the platinum film is inert in air, the SERS enhancing substrate can be used reliably in many trace chemical and biological detection applications. |
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