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Science 26 September 1997:
Vol. 277. no. 5334, pp. 1978 - 1981
DOI: 10.1126/science.277.5334.1978
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Reports

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

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

The linear and nonlinear (chi (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.

C. P. Collier and R. J. Saykally, Department of Chemistry, University of California, Berkeley, CA 94720, USA.
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.
*   To whom correspondence should be addressed.

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