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Open AccessArticle

Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction

1
School of Physics, Osnabrueck University, Barbarastr. 7, 49076 Osnabrueck, Germany
2
Department of Electrical Engineering and Information Technology, South Westphalia University of Applied Sciences, Haldener Str. 182, 58095 Hagen, Germany
3
Center for Cellular Nanoanalytics, CellNanOs, Osnabrueck University, Barbarastr. 11, 49076 Osnabrueck, Germany
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(22), 4933; https://doi.org/10.3390/app9224933
Received: 30 September 2019 / Revised: 12 November 2019 / Accepted: 13 November 2019 / Published: 16 November 2019
This paper addresses the challenging task of optical characterization of pure, dielectric (nano-)powders with the aim to provide an end-to-end instruction from appropriate sample preparation up to the determination of material remission and absorption spectra. We succeeded in establishing an innovative preparation procedure to reproducibly obtain powder pellet samples with an ideal Lambertian scattering behavior. As a result, a procedure based on diffuse reflectance spectroscopy was developed that allows for (i) performing reproducible and artifact-free, high-quality measurements as well as (ii) a thorough optical analysis using Monte Carlo and Mie scattering simulations yielding the absorption spectrum in the visible spectral range. The procedure is valid for the particular case of powders that can be compressed into thick, non-translucent pellets and neither requires embedding of the dielectric (nano-)powders within an appropriate host matrix for measurements nor the use of integrating spheres. The reduced spectroscopic procedure minimizes the large number of sources for errors, enables an in-depth understanding of non-avoidable artifacts and is of particular advantage in the field of material sciences, i.e., for getting first insights to the optical features of a newly synthesized, pure dielectric powder, but also as an inline inspection tool for massively parallelised material characterization. View Full-Text
Keywords: diffuse reflectance spectroscopy; integration sphere; optical materials; dielectric powder pellets; nanomaterials; TiO2; YAG:Ce3+; troubleshooting; simulation; absorption coefficient diffuse reflectance spectroscopy; integration sphere; optical materials; dielectric powder pellets; nanomaterials; TiO2; YAG:Ce3+; troubleshooting; simulation; absorption coefficient
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Bock, S.; Kijatkin, C.; Berben, D.; Imlau, M. Absorption and Remission Characterization of Pure, Dielectric (Nano-)Powders Using Diffuse Reflectance Spectroscopy: An End-To-End Instruction. Appl. Sci. 2019, 9, 4933.

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