Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-03T01:36:05.619Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Persans, P.D., Lu, E., Haus, J., and Wagoner, G. A., Mat. Res. Symp. Proc., 195, 591, (1990)Google Scholar
2. Willson, J. A. and Yoffe, A. D., Adv. Phys., 18, 192, (1969)Google Scholar
3. Perenboom, J. A. A. J. and Wyder, P., Phys. Repts., 78, 127, (1981)Google Scholar
4. Bohren, C. F. and Huffman, D. R., Absorption and Scattering of Light by Small Particles, pp. 83, John Wiley & Sons, 1983, NY, NY Google Scholar
5. Haus, J. W., Inguva, R., and Bowden, C. M., Phys. Rev. A, 40, 5729, (1989)Google Scholar
6. Lynch, D. W. and Hunter, W. R., The Optical Constants of Metals, Physik Daten, 18 (2), (1981)Google Scholar
7. Wagoner, G. A., MS Thesis, Rensselaer Polytechnic Institute, (August 1992)Google Scholar
8. Beal, A. R. and Hughes, H. P., J. Phys. C, 12, 881, (1979)Google Scholar
9. Roxlo, C. D., Daage, M., Ruppert, A. F., and Chiannelli, R. R., J. Catal., 100, 176, (1986)Google Scholar