Optical properties of carbon thin films containing nanoparticles

Manish Chhowalla, A. I. Munindradasa, K. G. Lim, G. A J Amaratunga, C. J. Kiely

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The incorporation of carbon nanoparticles in the forms of nanotubes and bucky onions have shown to improve the mechanical properties of amorphous carbon (a-C) thin films. In this paper we report on the change in the optical properties of a-C films containing nanoparticles. The optical band gap, index of refraction and extinction coefficient are studied. The optical band gap in highly tetrahedral amorphous carbon (ta-C) is found to be around 2 eV. It decreases almost linearly with the sp2 fraction. It is theorized that the clustering of the sp2 sites leads to a reduction in the band gap. In this paper, we study the influence of large sp2 clusters in forms of graphitic nanoparticles on the optical of ta-C. We find that the optical gap remains around 1.8 eV even with the large inclusions of clustered nanoparticles. Furthermore, the gap remains close to 1.8 eV even when the sp2 fraction in the amorphous matrix is increased. The index of refraction however is found to decrease with the sp2 fraction indicating a reduction in density.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMRS
Pages115-120
Number of pages6
Volume498
Publication statusPublished - 1997
EventProceedings of the 1997 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 1 1997Dec 4 1997

Other

OtherProceedings of the 1997 MRS Fall Symposium
CityBoston, MA, USA
Period12/1/9712/4/97

Fingerprint

Carbon films
Amorphous carbon
Optical properties
Nanoparticles
Thin films
Optical band gaps
Refraction
Amorphous films
Nanotubes
Energy gap
Carbon
Mechanical properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Chhowalla, M., Munindradasa, A. I., Lim, K. G., Amaratunga, G. A. J., & Kiely, C. J. (1997). Optical properties of carbon thin films containing nanoparticles. In Materials Research Society Symposium - Proceedings (Vol. 498, pp. 115-120). MRS.

Optical properties of carbon thin films containing nanoparticles. / Chhowalla, Manish; Munindradasa, A. I.; Lim, K. G.; Amaratunga, G. A J; Kiely, C. J.

Materials Research Society Symposium - Proceedings. Vol. 498 MRS, 1997. p. 115-120.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Chhowalla, M, Munindradasa, AI, Lim, KG, Amaratunga, GAJ & Kiely, CJ 1997, Optical properties of carbon thin films containing nanoparticles. in Materials Research Society Symposium - Proceedings. vol. 498, MRS, pp. 115-120, Proceedings of the 1997 MRS Fall Symposium, Boston, MA, USA, 12/1/97.
Chhowalla M, Munindradasa AI, Lim KG, Amaratunga GAJ, Kiely CJ. Optical properties of carbon thin films containing nanoparticles. In Materials Research Society Symposium - Proceedings. Vol. 498. MRS. 1997. p. 115-120
Chhowalla, Manish ; Munindradasa, A. I. ; Lim, K. G. ; Amaratunga, G. A J ; Kiely, C. J. / Optical properties of carbon thin films containing nanoparticles. Materials Research Society Symposium - Proceedings. Vol. 498 MRS, 1997. pp. 115-120
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