Nanosilver from nano-AgBr: synthesis, surface chemistry, and nonlinear optical properties

Erin Denise Moritz; Melville R. V. Sahyun; Scott N. Thorgaard

doi:10.1117/12.524177

14 June 2004 Nanosilver from nano-AgBr: synthesis, surface chemistry, and nonlinear optical properties

Erin Denise Moritz, Melville R. V. Sahyun, Scott N. Thorgaard

Proceedings Volume 5361, Quantum Dots, Nanoparticles, and Nanoclusters; (2004) https://doi.org/10.1117/12.524177
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

We report preparation of silver nanoparticles in the 10 nm size range by exhastive reduction of a well-known and well-characterized AgBr nanosol. These silver nanoparticles exhibit a second order hyperpolarizability tensor, β=(100±10) x 10^-30 esu per atom. The nanoparticles chmisorb a monolayer of iodide ions with concomitant bleaching of the surface plasmon absorption but no attenuation of Hyper-Rayleigh (second harmonic light) Scattering (HRS). Further addition of iodide leads to significant enhancement of HRS, which we attribute so surface-enhanced second harmonic scattering (SESHS) from iodide ion physisorbed on the AgI adlayer. A merocyanine dye, which does not exhibit HRS in solution, chemisorbs as a monolayer to the nanosilver, with formation of J-aggregates. These aggregates, like the free dye, are not active in second harmonic scattering. Further addition of dye leads to HRS enhancement, which we interpret as physisorption of dye onto the J-aggregate monolayer; the non-centrosymmetric surface environment allows observation of SESHS. A lower-limit estimate of the second order hyperpolarizability of the adsorbed dye is 200 X 10^-30 esu per molecule.

Citation Download Citation

Erin Denise Moritz, Melville R. V. Sahyun, and Scott N. Thorgaard "Nanosilver from nano-AgBr: synthesis, surface chemistry, and nonlinear optical properties", Proc. SPIE 5361, Quantum Dots, Nanoparticles, and Nanoclusters, (14 June 2004); https://doi.org/10.1117/12.524177

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