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Surface second harmonic generation from coumarin 343 dye-attached TiO2 nanoparticles at liquid–liquid interface

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Abstract

The nonlinear optical properties of coumarin 343 (C343) dye-attached TiO2 nanoparticles in the size range 5–8 nm adsorbed at the interface of water/1,2-dichloroethane have been studied by using the surface second harmonic generation technique. No second harmonic (SH) response was observed from the bare TiO2 nanoparticles adsorbed at the interface, however, a strong SH response was measured from the dye molecules attached at the surfaces of the nanoparticles. The increase in the SH intensity with the increase of TiO2 nanoparticle concentration in the aqueous solution of C343 is mainly due to the pre-alignment of the dye molecules at the surfaces of nanoparticles and is partly due to the third-order polarization contribution of the nanoparticles to the observed total SH response.

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Acknowledgments

The authors would like to thank reviewers for useful comments. This research work was financed by the office Fédérale de l’Education et de la Science (COST action D15) and EPFL. Valérie Devaud is acknowledged for her technical assistance. S.J. thanks BITS, Pilani for Ph.D. research fellowship.

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Authors and Affiliations

  1. Department of Physics, Birla Institute of Technology and Science (BITS), BITS Pilani, Rajasthan, 333031, India

    Debi D. Pant & Sunita Joshi

  2. Laboratoire d’Electrochimie, Ecole Polytechnique Fédérale de Lausanne, Swiss Federal Institute of Technology, 1015, Lausanne, Switzerland

    Hubert H. Girault

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  1. Debi D. Pant
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  2. Sunita Joshi
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  3. Hubert H. Girault
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Correspondence to Debi D. Pant.

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Pant, D.D., Joshi, S. & Girault, H.H. Surface second harmonic generation from coumarin 343 dye-attached TiO2 nanoparticles at liquid–liquid interface. J Nanopart Res 13, 7057–7064 (2011). https://doi.org/10.1007/s11051-011-0618-2

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  • DOI: https://doi.org/10.1007/s11051-011-0618-2

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