Ultrafast photoresponses of CdS nanoparticles in self-assembled films

Hiroshi Inoue; Robert S. Urquhart; Toshihiko Nagamura; Franz Grieser; Hiroshi Sakaguchi; D. Neil Furlong

doi:10.2494/photopolymer.11.73

Hiroshi Inoue, Robert S. Urquhart, Toshihiko Nagamura, Franz Grieser, Hiroshi Sakaguchi, D. Neil Furlong

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Keywords: nanoparticles, semiconductor, self-assembled films, transient photobleaching, femtosecond laser

JOURNAL FREE ACCESS

1998 Volume 11 Issue 1 Pages 73-76

DOI https://doi.org/10.2494/photopolymer.11.73

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Abstract

The ultra-fast dynamics of transient photobleaching and recovery of cadmium sulphide nanoparticles with sizes of about 4.0nm diameter in self-assembled films of ethylenediamine amphiphiles was studied upon excitation with a femtosecond laser at 400 nm. Maximum photobleaching occurred within about 1 picosecond. The bleaching then recovered with multi-exponential kinetics. The peak of the transient photobleaching spectrum showed a progressive red shift as the time between the pump and probe pulses was increased. The observed transient spectral shifts have been explained in terms of the number of trapping sites present on the particle surface.

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