Reversible Tuning of Silver Quantum Dot Monolayers Through the Metal-Insulator Transition-Reference-Cited by-同舟云学术

Reversible Tuning of Silver Quantum Dot Monolayers Through the Metal-Insulator Transition

Published:1997-09-26 Issue:5334 Volume:277 Page:1978-1981
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Collier C. P.¹²,Saykally R. J.¹²,Shiang J. J.¹²,Henrichs S. E.¹²,Heath J. R.¹²

Affiliation:

1. C. P. Collier and R. J. Saykally, Department of Chemistry, University of California, Berkeley, CA 94720, USA.

2. J. J. Shiang, S. E. Henrichs, J. R. Heath, Department of Chemistry and Biochemistry, University of California, 405 Hilgard Avenue, Los Angeles, CA 90095, USA.

Abstract

The linear and nonlinear (χ (2) ) optical responses of Langmuir monolayers of organically functionalized silver quantum dots were measured as a continuous function of interparticle separation under near-ambient conditions. As the distance between metal surfaces was decreased from 12 to ∼5 angstroms, both quantum and classical effects were observed in the optical signals. When the separation was less than 5 angstroms, the optical second-harmonic generation (SHG) response exhibited a sharp discontinuity, and the linear reflectance and absorbance began to resemble those of a thin metallic film, indicating that an insulator-to-metal transition occurred. This transition was reversible.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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