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Journal of Nanophotonics

Determination of optical band gap of powder-form nanomaterials with improved accuracy
Author(s): Ragib Ahsan; Md. Ziaur Rahman Khan; Mohammed Abdul Basith
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Paper Abstract

Accurate determination of a material’s optical band gap lies in the precise measurement of its absorption coefficients, either from its absorbance via the Beer–Lambert law or diffuse reflectance spectrum via the Kubelka–Munk function. Absorption coefficients of powder-form nanomaterials calculated from absorbance spectrum do not match those calculated from diffuse reflectance spectrum, implying the inaccuracy of the traditional optical band gap measurement method for such samples. We have modified the Beer–Lambert law and the Kubelka–Munk function with proper approximations for powder-form nanomaterials. Applying the modified method for powder-form nanomaterial samples, both absorbance and diffuse reflectance spectra yield exactly the same absorption coefficients and therefore accurately determine the optical band gap.

Paper Details

Date Published: 1 December 2017
PDF: 13 pages
J. Nanophoton. 11(4) 046016 doi: 10.1117/1.JNP.11.046016
Published in: Journal of Nanophotonics Volume 11, Issue 4
Show Author Affiliations
Ragib Ahsan, Bangladesh Univ. of Engineering and Technology (Bangladesh)
Md. Ziaur Rahman Khan, Bangladesh Univ. of Engineering and Technology (Bangladesh)
Mohammed Abdul Basith, Bangladesh Univ. of Engineering and Technology (Bangladesh)

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