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Reversible tuning of silver quantum dot monolayers through the metal-insulator transition
Collier, C. P.; Saykally, R. J.; Shiang, J. J.; Henrichs, S. E.; Heath, J. R.
Science (Washington, D. C.) (1997), 277(5334), 1978-1981
CODEN: SCIEAS; ISSN: 0036-8075. English.
The linear and nonlinear (.chi.(2))optical responses of Langmuir monolayers of alkylthiol capped silver quantum dots were measured as a continuous function of inter-particle separation under near-ambient conditions. As the distance between metal surfaces was decreased from 12 to .apprx.5 .ANG., both quantum and classical effects was observed in the optical signals. When the separation was <5 .ANG., 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.
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