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Formation of uniform carrot-like Cu31S16-CuInS2 heteronanostructures assisted by citric acid at the oil/aqueous interface

Abstract

A simple two-phase was developed to prepare Cu31S16-CuInS2 heterostructures (HNS) at the oil/aqueous interface, in which In(OH)3 phase was often obtained in the products due to the reaction between indium ions and hydroxyl ions in the aqueous phase. To prevent the formation of In(OH)3 phase, the citric acid was incorporated into the aqueous to assist the synthesis of uniform carrot-like Cu31S16-CuInS2 semiconductor HNS at the oil/aqueous interface for the first time. By manipulating the dosage of citric acid and Cu/In precursor ratios, the morphology of the Cu31S16-CuInS2 HNS could be tailored from mushroom to carrot-like, and the presence of citric acid played a critical role in the synthesis of high-quality Cu31S16-CuInS2 HNS, which inhibited the formation of In(OH)3 phase due to the formation of indium(III)-citric acid complex. The formation mechanism was discussed by monitoring the morphology and phase evolution of the Cu31S16-CuInS2 HNS with the reaction time, which revealed that the Cu31S16 seeds were firstly formed and then cation-exchange reaction directed the subsequent anisotropic growth of Cu31S16-CuInS2 HNS.

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Publication details

The article was received on 13 Nov 2017, accepted on 04 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT04274D
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Formation of uniform carrot-like Cu31S16-CuInS2 heteronanostructures assisted by citric acid at the oil/aqueous interface

    Y. Li, A. Tang, Z. Liu, L. Peng, Y. Yuan, X. Shi, C. Yang and F. Teng, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT04274D

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