Time-dependent SERS of pseudoisocyanine on silver particles generated in silver bromide sol by laser illumination |
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| Institution: | 1. Department of Physics, Universitas Gadjah Mada, Yogyakarta, Indonesia;2. Department of Physics, Institut Teknologi Sumatera, Lampung, Indonesia;1. Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;2. School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;3. Solid State and Elemental Analysis Unit, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW 2052, Australia;4. School of Engineering, Macquarie University, Sydney, NSW 2109, Australia;5. School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;1. Department of Electrical & Electronic Engineering, Rajshahi University of Engineering & Technology, Rajshahi 6204, Bangladesh;2. Department of Electrical & Computer Engineering, Rajshahi University of Engineering & Technology, Rajshahi 6204, Bangladesh;3. Department of Computer Science, Cihan University Sulaimaniya, Sulaimaniya 46001, Kurdistan Region, Iraq;1. Grupo de Aplicaciones del Láser y Fotónica (ALF-USAL), Universidad de Salamanca, Pl. de la Merced s/n, 37008 Salamanca, Spain;2. Instituto de Química Física Rocasolano, Consejo Superior de Investigaciones Científicas (IQFR-CSIC), Serrano 119, 28006 Madrid, Spain;3. CONACYT- Centro de Investigación Científica y de Educación Superior de Ensenada, Unidad Foránea Monterrey, Alianza Centro 504, PIIT, Apodaca, Nuevo León CP 66629, Mexico;4. Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas (IEM-CSIC), Serrano 121, 28006 Madrid, Spain;1. Dr. Shanti Swarup Bhatnagar University Institute of Chemical Engineering and Technology (formerly Department of Chemical Engineering & Technology), Panjab University, Chandigarh 160014, India;2. Department of ECE, DIT University, Dehradun 248009, India;3. Defence Materials and Stores R & D Establishment (DRDO), Kanpur 208013, India;4. Energy Research Centre, Panjab University, Chandigarh 160014, India;5. Centre for Nanoscience & Nanotechnology, University Institute for Emerging Areas in Science and Technology, Panjab University, Chandigarh 160014, India |
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| Abstract: | SERS spectra of pseudoisocyanine dye (PIC) in silver bromide sols show a strong time-dependence. The enhancement factor, in general, follows the formation (and destruction) of SERS-active colloidal silver in the silver halide sols by laser illumination during the Raman measurement. Changes in the relative intensities within a characteristic fine triplet of the SERS spectrum show that the surface potential which is “seen” by the dye molecules shifts to more positive values with longer times. In particular, the values of the potential hint at the existence of Ag1 and Ag4 … Ag6 clusters as SERS-active adsorption sites of the dye molecules in AgBr sols. |
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