High-temperature solvothermal synthesis and magnetic properties of nearly monodisperse CdCr2S4 nanocrystals

Chao Pang; Ling Gao; Anurag Chaturvedi; Ningzhong Bao; Kazumichi Yanagisawa; Liming Shen; Arunava Gupta

doi:10.1039/C5TC02727F

High-temperature solvothermal synthesis and magnetic properties of nearly monodisperse CdCr₂S₄ nanocrystals

Chao Pang,^a Ling Gao,^a Anurag Chaturvedi,^b Ningzhong Bao,^a Kazumichi Yanagisawa,^c Liming Shen*^a and Arunava Gupta*^b

Author affiliations

* Corresponding authors

^a State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University (Former Name: Nanjing University of Technology), Nanjing 210009, P. R. China
E-mail: lshen@njtech.edu.cn

^b Center for Materials for Information Technology (MINT), The University of Alabama, Tuscaloosa 35487, USA
E-mail: agupta@mint.ua.edu

^c Research Laboratory of Hydrothermal Chemistry, Faculty of Science, Kochi University, Kochi 780-8520, Japan

Abstract

Magnetic spinel CdCr₂S₄ nanocrystals have been synthesized using a high-temperature solvothermal method. The synthesis process involves the reaction of excess 1-dodecanethiol (1-DDT) with CdCl₂ and CrCl₃·6H₂O in 1-octadecene (ODE) solution carried out in a sealed titanium alloy autoclave. Nearly monodisperse spherical CdCr₂S₄ nanocrystals with an average size of 8.0 ± 1.5 nm are obtained. X-ray diffraction patterns confirm formation of the pure spinel phase without any impurities. Magnetic measurements indicate a Curie temperature (T_c) of ∼76 K for the synthesized CdCr₂S₄ nanocrystals, which are ferromagnetic at lower temperatures with a saturation magnetization value of 19 emu g⁻¹ at 5 K. The magnetic entropy change ΔS_m, evaluated from isothermal magnetic measurements, exhibits a maximum around 82 K, with a value of −ΔS_m = 0.86 J kg⁻¹ K⁻¹ at H_max = 5 T. ΔS_m spans a broad temperature range, with a full width at half maximum of ∼88 K in the magnetic field range of 0–5 T, which is attractive for magnetic refrigeration applications in the liquid nitrogen temperature range.

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Publication details

The article was received on 01 Sep 2015, accepted on 29 Oct 2015 and first published on 30 Oct 2015

Article type: Paper

DOI: 10.1039/C5TC02727F

Citation: J. Mater. Chem. C, 2015,3, 12077-12082

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High-temperature solvothermal synthesis and magnetic properties of nearly monodisperse CdCr₂S₄ nanocrystals

C. Pang, L. Gao, A. Chaturvedi, N. Bao, K. Yanagisawa, L. Shen and A. Gupta, J. Mater. Chem. C, 2015, 3, 12077
DOI: 10.1039/C5TC02727F
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Journal of Materials Chemistry C

High-temperature solvothermal synthesis and magnetic properties of nearly monodisperse CdCr₂S₄ nanocrystals

Abstract

Supplementary files

Publication details

High-temperature solvothermal synthesis and magnetic properties of nearly monodisperse CdCr₂S₄ nanocrystals

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