Why Does CuFeS2 Resemble Gold?

Sugathan, Anumol and Bhattacharyya, Biswajit and Kishore, V V R and Kumar, Abhinav and Rajasekar, Guru Pratheep and Sarma, D D and Pandey, Anshu (2018) Why Does CuFeS2 Resemble Gold? In: JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9 (4). pp. 696-701.

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Abstract

While several potential applications of CuFeS2 quantum dots have already been reported, doubts regarding their optical and physical properties persist. In particular, it is unclear if the quantum dot material is metallic, a degenerately doped semiconductor, or else an intrinsic semiconductor material. Here we examine the physical properties of CuFeS2 quantum dots in order to address this issue. Specifically, we study the bump that is observed in the optical spectra of these quantum dots at similar to 500 nm. Using a combination of structural and optical characterization methods, ultrafast spectroscopy, as well as electronic structure. calculations, we ascertain that the unusual purple color of CuFeS2 quantum dots as well the golden luster of CuFeS2 films arise from the existence of a plasmon resonance in these materials. While the presence of free carriers causes this material to resemble gold, surface treatments are also described to suppress the plasmon resonance altogether.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Publisher:	AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Additional Information:	Copy right for the article belong to AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	14 Mar 2018 17:39
Last Modified:	14 Mar 2018 17:39
URI:	http://eprints.iisc.ac.in/id/eprint/59169

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