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Synthesis and properties of ZnO / TiO2 / Sb2S3 core-shell nanowire heterostructures using the SILAR technique

Abstract

The development of the successive ionic layer adsorption and reaction (SILAR) technique is of high interest for the integration of a semiconducting layer on high aspect ratio nanoscale structures. We show the deposition of a Sb2S3 shell by SILAR on top of ZnO / TiO2 core-shell nanowire heterostructures, using antimony chloride and sodium sulfide as cationic and anionic precursors, respectively. The conformal anatase-TiO2 shell deposited by atomic layer deposition acts as a protective layer to chemically stabilize these heterostructures with a type II band alignment in the cationic precursor solution. The resulting Sb2S3 shell is composed of uniformly distributed Sb2S3 clusters crystallized at the relatively low temperature of 250 °C from the bottom to the top of ZnO nanowires. It is further of high purity, where only a very minor senarmontite-Sb2O3 phase is detected by Raman spectroscopy, and exhibits a relevant band gap energy of 1.74 eV following a Tauc plot in the framework of the double pass analysis. These findings reveal the high potential of the SILAR technique to form ZnO core-shell nanowire heterostructures with high uniformity and at moderate temperature as well as its assets over the most widely used chemical bath deposition technique.

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Publication details

The article was received on 14 May 2018, accepted on 29 Jun 2018 and first published on 03 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00789F
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Synthesis and properties of ZnO / TiO2 / Sb2S3 core-shell nanowire heterostructures using the SILAR technique

    R. Parize, T. Cossuet, E. Appert, O. Chaix-Pluchery, H. Roussel, L. Rapenne and V. Consonni, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00789F

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