Second-order optical nonlinearity of surface-capped CdS nanoparticles and effect of surface modification |
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| Affiliation: | 1. Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People''s Republic of China;2. National Laboratory of Molecular and Biomolecular Electronics, Southeast University, Nanjing 210096, People''s Republic of China;1. Department of Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India;2. Technical Research Centre (TRC), S. N. Bose National Centre for Basic Sciences, Salt Lake, JD Block, Sector III, Kolkata 700106, India;3. Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany;4. Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada;5. Department of Gastroenterology, AMRI Hospital, Salt Lake City, JC-16 and 17, Kolkata 700098, India;1. School of Physical Science and Technology, Southwest University, Chongqing 400715, China;2. School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China;1. Department of Chemistry Anna University (BIT Campus), Tiruchirappali, India;2. Nano-COED, SONA College of Technology, Salem, India;1. Far Eastern Federal University, Vladivostok 690950, Russian Federation;2. Institute of Chemistry, Far-Eastern Branch, Russian Academy of Sciences, Vladivostok 690022, Russian Federation;3. National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russian Federation);1. Molecular Nanotechnology Laboratory, Department of Inorganic Chemistry, University of Alicante, Carretera San Vicente s/n, E-03690 Alicante, Spain;2. Department of Engineering Sciences, Uppsala University, Box 534, SE-75121 Uppsala, Sweden;3. Department of Chemistry and Biotechnology, BioCenter SLU, Box 7015, SE-75007 Uppsala, Sweden;1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;2. Hunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha 410082, China |
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| Abstract: | Surface-capped CdS nanoparticles (5 nm mean diameter) with hexametaphosphate and CTAB (hexadecyltrimethyl-ammonium bromide) in chloroform were prepared by colloidal chemistry and phase transfer method. The second-order nonlinear optical response was measured by incoherent hyper-Rayleigh scattering (HRS) technique. Results show that the surface-capped CdS nanoparticles have a large first-order hyperpolarizability β value of 1.30×10−26 esu per particle. Surface capping molecule modification was performed by adding pyridine to a chloroform sol of the surface-capped CdS nanoparticles where pyridine can be bound to the CdS nanoparticle surface through Cd–N chemical bonds. A reduction in HRS signal intensity was observed when increasing pyridine concentration. This is explained in terms of a two-level model approximation derived from molecular chromophores, when considering the influence of the formation of Cd–N coordinating bonds on the charge-transfer transition energy of surface molecule-like scatterers of Cd–S polar bonds. |
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