Abstract
Incorporating nanoscale materials into suitable matrices is an effective route to produce nanocomposites with unique properties for practical applications. Due to the flexibility in precursor atomization and delivery, aerosol-assisted chemical vapour deposition (AACVD) process is a promising way to synthesize desired nanocomposite coatings incorporating with preformed nanoscale materials. The presence of nanoscale materials in AACVD process would significantly influence deposition mechanism and thus affect microstructure and properties of the nanocomposites. In the present work, inorganic fullerene-like tungsten disulfide (IF-WS2) has been codeposited with Cr2O3coatings using AACVD. In order to understand the codeposition process for the nanocomposite coatings, chemical reactions of the precursor and the deposition mechanism have been studied. The correlation between microstructure of the nanocomposite coatings and the codeposition mechanism in the AACVD process has been investigated. The heterogeneous reaction on the surface of IF-WS2nanoparticles, before reaching the substrate surface, is the key feature of the codeposition in the AACVD process. The agglomeration of nanoparticles in the nanocomposite coatings is also discussed.
Highlights
Nanotechnology is one of the most popular research areas in the last decade
Most studies on the use of nanoscale materials in nanocomposites or nanocomposite coatings are limited to inorganic filler and polymer matrix systems [10, 11], in which the processing conditions are relatively mild in order to preserve the unique microstructures and properties of the nanoscale materials
The atomization Journal of Nanomaterials of precursor dispersion or colloid in aerosol-assisted chemical vapour deposition (AACVD) process allows the introduction of preformed nanoscale materials and codeposits them with matrix materials simultaneously, to form the desired nanocomposite coatings onto the substrate surface. These results demonstrated that AACVD is a promising method for the synthesis of nanocomposite coatings with the codeposition of preformed nanoscale materials
Summary
Nanotechnology is one of the most popular research areas in the last decade. Materials on nanoscale can exhibit unique properties as compared to those on a macroscale [1]. Various nanoscale materials have been developed, such as nanoparticles, nanotubes, nanofibers, nanowires, nanorods, nanobelts, and nanosheets, for promising applications in semiconductors, optics, mechanics, energy, catalysts, sensors and biology, and so forth [2,3,4,5,6,7]. Incorporating these nanoscale materials into suitable matrices to form nanocomposites, either in the form of bulk materials or coatings, is considered an important route to realise the unique properties of nanoscale materials for practical applications [8, 9]. It is a challenge to produce inorganic nanocomposite systems with the incorporation of the preformed nanoscale materials into ceramic matrices, due to a much higher processing temperature and critical processing environment which tend to be less favourable for the nanoscale materials
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