alpha - HgS Nanocrystals: Synthesis, Structure and Optical Properties

Details alpha - HgS Nanocrystals: Synthesis, Structure and Optical Properties alpha - HgS Nanocrystals: Synthesis, Structure and Optical Properties

2006-05-13

arxiv.org/abs/cond-mat/0605362v2

Physica E 35 (2006) 9 - 15

Physics

Condensed Matter

Materials Science

Scientific paper

10.1016/j.physe.2006.03.164

Well-separated mercury sulfide (HgS) nanocrystals are synthesized by a wet chemical route. Transmission electron microscopy studies show that nanocrystals are nearly spherical in shape with average size of 9 nm. Grazing angle X-ray diffraction confirms that HgS nanocrystals are in cinnabar phase. Particle induced X-ray emission and Rutherford back scattering spectrometry analysis reveal HgS nanocrystals are stoichiometric and free from foreign impurities. The optical absorption measurements show two excitonic peaks corresponding to electron-heavy hole and electron-light hole transitions, which are blue shifted by 0.1 and 0.2 eV, respectively, from its bulk value, due to quantum size effect. The experimental data obtained by optical absorption measurement is simulated with a theoretical model considering the particle size distribution as Gaussian.

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