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Open AccessArticle

Preparation and Characterization of WS2@SiO2 and WS2@PANI Core-Shell Nanocomposites

Institute of Nanotechnology and Advanced Materials & Department of Chemistry, Faculty of Exact Sciences, Bar-Ilan University, Ramat Gan 5290002, Israel
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Nanomaterials 2018, 8(3), 156; https://doi.org/10.3390/nano8030156
Received: 8 February 2018 / Revised: 7 March 2018 / Accepted: 8 March 2018 / Published: 10 March 2018
(This article belongs to the Special Issue Nanomaterials with Functional Polymer Elements)
Two tungsten disulfide (WS2)-based core-shell nanocomposites were fabricated using readily available reagents and simple procedures. The surface was pre-treated with a surfactant couple in a layer-by-layer approach, enabling good dispersion of the WS2 nanostructures in aqueous media and providing a template for the polymerization of a silica (SiO2) shell. After a Stöber-like reaction, a conformal silica coating was achieved. Inspired by the resulting nanocomposite, a second one was prepared by reacting the surfactant-modified WS2 nanostructures with aniline and an oxidizing agent in an aqueous medium. Here too, a conformal coating of polyaniline (PANI) was obtained, giving a WS2@PANI nanocomposite. Both nanocomposites were analyzed by electron microscopy, energy dispersive X-ray spectroscopy (EDS) and FTIR, verifying the core-shell structure and the character of shells. The silica shell was amorphous and mesoporous and the surface area of the composite increases with shell thickness. Polyaniline shells slightly differ in their morphologies dependent on the acid used in the polymerization process and are amorphous like the silica shell. Electron paramagnetic resonance (EPR) spectroscopy of the WS2@PANI nanocomposite showed variation between bulk PANI and the PANI shell. These two nanocomposites have great potential to expand the use of transition metals dichalcogenides (TMDCs) for new applications in different fields. View Full-Text
Keywords: WS2; functionalization; core-shell; polyaniline; silica WS2; functionalization; core-shell; polyaniline; silica
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MDPI and ACS Style

Sade, H.; Lellouche, J.-P. Preparation and Characterization of WS2@SiO2 and WS2@PANI Core-Shell Nanocomposites. Nanomaterials 2018, 8, 156.

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