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Semiconductor Nanoparticles for Quantum Devices

Sandro Carrara, Victor Erokhin, and Claudio Nicolini*

El.B.A. Foundation, Rome (Italy) and
Institute of Biophysics, University of Genoa (Italy)

This is an abstract for a poster to be presented at the Fifth Foresight Conference on Molecular Nanotechnology. The full paper is available here.

Semiconductor nanoparticles were produced by exposing fatty acid salt Langmuir-Blodgett films to the atmosphere of H2S [1]. Particles of different materials, such as CdS, PbS, MgS etc. were formed and studied by various experimental techniques. Single electron conductivity was observed in structures, based on these particles [2]. It was also shown the possibility to form thin polycrystalline semiconductor layers, performing self-aggregation of these particles by selective removal of fatty acid molecules in organic solvents [3]. In the present work the approach was developed for making superlattices. Initially, the particle size distribution function was calculated from the small-angle X-ray scattering in solution using the new synchrotron radiation facility at Trieste (Italy). Alternating LB films of fatty acid salts with different metals were deposited, varying their thickness, followed by the reaction and selective removal of the fatty acid matrix. Structure of the film was then investigated with X-ray diffraction and STM microscopy. The measurements revealed that the approach allows to form semiconductor superlattices with sharp boundaries between adjacent layers. Work is in progress towards the implementation of quantum devices based on the above nanoparticles.

[1] E.S. Smotkin, C. Lee, A.J. Bard, A. Campion, M.A. Fox, T.E. Mallouk, S.I. Webber, and J.M. White. Chem. Phys. Lett., 152, 265-270 (1988).
[2] P. Facci, V. Erokhin, S. Carrara, and C. Nicolini. Proc. Natl. Acad. Sci. USA 93, 10556-10559 (1996)
[3] P. Facci, V. Erokhin, A. Tronin, and C. Nicolini. J. Phys Chem. 98, 13323-13327 (1994).

*Corresponding Address:
Claudio Nicolini, Fondazione EL.B.A., Via Medaglie d'Oro 305 - 00136 Rome, Italy, ph: +39 6 35410728, fax: +39 6 35451637, email:
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