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O: Oberflächenphysik

O 24: Teilchen und Cluster I

O 24.3: Talk

Saturday, March 5, 2005, 15:30–15:45, TU EB301

Colorimetric properties of titanium group nitride nanoparticles and their optimization — •A. Reinholdt¹, R. Pecenka¹, Th. E. Weirich², and U. Kreibig¹ — ¹I. Phys. Inst. 1A der RWTH Aachen, Postfach, 52056 Aachen — ²GFE der RWTH Aachen, Ahornstr. 55, 52074 Aachen

If long-term stable color pigments are needed, inorganic materials have advantages against organic dyes, which may disintegrate in time or by irradiation of UV light. The richness of colors is high if the colorants are nanoparticles because of selective extinction effects (e.g. Mie resonances). Beside other materials, the nitrides of the titanium group turned out to be well suited for this application due to the Drude-like contibutions to their dielectric functions [1,2].

In this presentation, results of the colorimetric investigation of embedded TiN and ZrN nanoparticles are shown. Experimental data and simulations based upon extensions of Mie’s theory are presented, both displaying the dependency of the chromaticity coordinates on the concentration, sample thickness and the embedding material. We will discuss the applicability of these nanoparticles as color pigments and the possibilities of color optimization. All data will be presented in the CIE 1976 (L^*a^*b^*) color space system.

[1] A. Reinholdt et al.: Appl. Phys. B 77, 681-686 (2003)

[2] A. Reinholdt et al.: Eur. Phys. J. D 31, 69-76 (2004)