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Article

Colloidal Synthesis and Thermoelectric Properties of CuFeSe2 Nanocrystals

1
The Key Laboratory of Environment Friendly Polymer Materials of Anhui Province, School of Chemistry & Chemical Engineering, Anhui University, Hefei 230601, China
2
Catalonia Institute for Energy Research-IREC, SantAdrià de Besòs, 08930 Barcelona, Spain
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2018, 8(1), 8; https://doi.org/10.3390/nano8010008
Received: 17 November 2017 / Revised: 9 December 2017 / Accepted: 24 December 2017 / Published: 26 December 2017
(This article belongs to the Special Issue Thermoelectric Nanomaterials)
Copper-based chalcogenides that contain abundant, low-cost and environmentally-friendly elements, are excellent materials for numerous energy conversion applications, such as photocatalysis, photovoltaics, photoelectricity and thermoelectrics (TE). Here, we present a high-yield and upscalable colloidal synthesis route for the production of monodisperse ternary I-III-VI2 chalcogenides nanocrystals (NCs), particularly stannite CuFeSe2, with uniform shape and narrow size distributions by using selenium powder as the anion precursor and CuCl2·2H2O and FeCl3 as the cationic precursors. The composition, the state of valence, size and morphology of the CuFeSe2 materials were examined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM) and high resolution transmission electron microscope (HRTEM), respectively. Furthermore, the TE properties characterization of these dense nanomaterials compacted from monodisperse CuFeSe2 NCs by hot press at 623 K were preliminarily studied after ligand removal by means of hydrazine and hexane solution. The TE performances of the sintered CuFeSe2 pellets were characterized in the temperature range from room temperature to 653 K. Finally, the dimensionless TE figure of merit (ZT) of this Earth-abundant and intrinsic p-type CuFeSe2 NCs is significantly increased to 0.22 at 653 K in this work, which is demonstrated to show a promising TE materialand makes it a possible p-type candidate for medium-temperature TE applications. View Full-Text
Keywords: CuFeSe2; nanocrystals; colloidal synthesis; ligand removal; thermoelectric property CuFeSe2; nanocrystals; colloidal synthesis; ligand removal; thermoelectric property
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MDPI and ACS Style

Zhang, B.-Q.; Liu, Y.; Zuo, Y.; Chen, J.-S.; Song, J.-M.; Niu, H.-L.; Mao, C.-J. Colloidal Synthesis and Thermoelectric Properties of CuFeSe2 Nanocrystals. Nanomaterials 2018, 8, 8. https://doi.org/10.3390/nano8010008

AMA Style

Zhang B-Q, Liu Y, Zuo Y, Chen J-S, Song J-M, Niu H-L, Mao C-J. Colloidal Synthesis and Thermoelectric Properties of CuFeSe2 Nanocrystals. Nanomaterials. 2018; 8(1):8. https://doi.org/10.3390/nano8010008

Chicago/Turabian Style

Zhang, Bing-Qian, Yu Liu, Yong Zuo, Jing-Shuai Chen, Ji-Ming Song, He-Lin Niu, and Chang-Jie Mao. 2018. "Colloidal Synthesis and Thermoelectric Properties of CuFeSe2 Nanocrystals" Nanomaterials 8, no. 1: 8. https://doi.org/10.3390/nano8010008

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