Synthesis and spectrum stability of high quality CdTe quantum dots capped with stearate groups in N-oleoylmorpholine solvent |
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Authors: | Xinmei Liu Yang Jiang Chun Wang Shanying Li Xinzheng Lan Yan Chen Honghai Zhong |
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Affiliation: | 1. School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;2. Department of Biological and Chemical Engineering, Guangxi University of Technology, Liuzhou, Guangxi 545006, PR China |
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Abstract: | The stearate-capped CdTe quantum dots (QDs) have been first prepared via direct reaction of cadmium stearate with Te powder in N-oleoylmorpholine solvent, which was a kind of clean, air-stable and conveniently synthesized acylamide, and can readily dissolve precursors cadmium stearate and Te powder at a relative low temperature. The as-prepared CdTe QDs exhibited size-dependent optical properties, steep absorbance edge and narrow photoluminescence full width at half maximum. The high-resolution transmission electron microscopy images and X-ray diffraction revealed that the highly monodisperse CdTe QDs were of regular spherical morphology with zinc blende crystal structure displaying mean sizes of about 4 nm. The energy dispersed spectrometry measurement indicated the presence of Cd and Te, with the Cd:Te ratio being close to 1:1. Fourier transform infrared transmission spectra confirmed the existence of stearate on the CdTe QDs surfaces. The experimental results also demonstrated that the stearate-capped CdTe QDs had an unexpected good stability. |
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Keywords: | A1. Low dimensional structures A1. Solvent B1. Tellurites B2. Semiconducting II&ndash VI materials |
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