Synthesis and Photoelectric Properties of High Quality CuFeS2 Nanocrystals with Tunable Sizes†

doi:10.7503/cjcu20140831

Abstract

Abstract:

The mono-dispersed CuFeS₂ nanocrystals(NCs) with tunable sizes were synthesized and characte-rized by UV-Vis-NIR absorption spectroscopy, transmission electron microscopy(TEM), X-ray powder diffraction(XRD) and inductively coupled plasma(ICP). It is found that the as-prepared CuFeS₂ NCs show photoluminescence in visible region. The photo-responsive properties of CuFeS₂ NCs further reveal their suitability as optically active components for optoelectronic devices and the growth in size due to the quantum size effect. All the experimental results indicate that as-prepared CuFeS₂ NCs with characteristics of fluorescence has potential application in biomedical imaging and optoelectronic devices.

Key words: CuFeS₂, Nanocrystals, Photoluminescence, Photocurrent

CLC Number:

O613
O649

TrendMD:

ZHANG Zhuolei, LI Dongze, LIU Zhihui, XIE Renguo. Synthesis and Photoelectric Properties of High Quality CuFeS₂ Nanocrystals with Tunable Sizes^†[J]. Chem. J. Chinese Universities, 2014, 35(12): 2505.

Figures/Tables 5

Fig.1 Typical TEM images(A—D) and size distributions(A'—D') of CuFeS2 NCs prepared at 230 ℃(A, A1), 240 ℃(B, B1), 250 ℃(C, C1) and 260 ℃(D, D1)

Fig.2 High-resolution TEM image of as-prepared 8.5 nm CuFeS2 NCs(A) and XRD patterns of CuFeS2 NCs with the size of 4.5 and 8.5 nm(B)

Table 1 Results of quantitative analysis via ICP

Reaction temperature/℃	Particle size/nm	Concentration of copper ion/(mol·L^-1)	Concentration of ferric ion/(mol·L^-1)	Cu/Fe atomic ratio
230	4.5	0.0207	0.0218	1:1.05
240	6.2	0.0205	0.0223	1:1.09
250	7.4	0.0192	0.0178	1:0.93
260	8.5	0.0209	0.0203	1:0.98

Fig.3 Optical absorption spectra of CuFeS2 NCs synthesized at 230(a), 240(b), 250(c) and 260 ℃(d)(A) and sizing curves for CuFeS2 NCs(B) (A) The inset shows the photoluminescence spectrum of the product obtained at 230 ℃; (B) the excitation wavelength was 460 nm.

Fig.4 Schematic illustration of solution-processed CuFeS2 NCs device(A) and I-V curves of CuFeS2 NCs(8.5 nm) thin film in the dark state(Dark) and under AM1.5 illumination(Light)(B)

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Synthesis and Photoelectric Properties of High Quality CuFeS₂ Nanocrystals with Tunable Sizes^†

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