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Optical Properties of Colloidal MoS2

Published online by Cambridge University Press:  28 February 2011

G. A. Wagoner ,
P. D. Persans  and
A. F. Ruppert
G. A. Wagoner
Affiliation:
Physics Department, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180–3590
P. D. Persans
Affiliation:
Physics Department, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180–3590
A. F. Ruppert
Affiliation:
Exxon Research and Engineering Company. Route 22 East, Aunandole. NJ 08801
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Abstract

We report measurements and analysis of the optical transmission spectra of colloidal 2H-M0S2. prepared by ultrasonic shattering of synthetic crystals in N-Methyl Formamide. We used a combination of TEM, X-ray diffraction and dynamic light scattering to characterize particle shape and size. For a typical sample, the particles are platelets which have an average thickness of 50 Å and a diameter of 500 Å. Particle dielectric functions, deduced from both dilute colloids and thin films prepared by flocculaUon, differ significantly from bulk values. Calculations show that the average extinction coefficient is affected by particle aspect ratio, but this can not explain all the features of the data. Specifically, we observe a suppression of the absorbance peaks in the band edge exciton region between 1.7 and 2.1 eV, and increased absorbance below 1.7 eV. We suggest that the particles do not possess bulk-like dielectric properties and that tins is due to defects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 283: Symposium F – Microcrystalline Semiconductors–Materials Science and Devices , 1992 , 909
Copyright
Copyright © Materials Research Society 1993

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References

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