A range of binary, ternary (CFS), and quaternary (CZTS) metal sulfide materials have been successfully deposited onto the glass substrates by air-spray deposition of metal diethyldithiocarbamate molecular precursors followed by pyrolysis (18 examples). The as-deposited materials were characterized by powder X-ray diffraction (p-XRD), Raman spectroscopy, secondary electron microscopy (SEM), and energy-dispersive X-ray (EDX) spectroscopy, which in all cases showed that the materials were polycrystalline with the expected elemental stoichiometry. In the case of the higher sulfides, EDX spectroscopy mapping demonstrated the spatial homogeneity of the elemental distributions at the microscale. By using this simple and inexpensive method, we could potentially fabricate thin films of any given main group or transition metal chalcogenide material over large areas, theoretically on substrates with complex topologies.
UV light can cause damage to polymer coatings used in transportation, oil, and agricultural industries, requiring costly repair or replacement of the coating. Herein, a self‐healing epoxy coating is developed so that UV light activates a desirable autonomous healing response to mechanical damage. The coatings contain a single type of microcapsule with a UV‐curable epoxy healing chemistry in the core and a novel UV‐protecting shell wall with embedded carbon black particles. Photo‐differential scanning calorimetry reveals that up to a 65% degree of protection is provided by the UV‐blocking shell wall after UV exposure. The addition of a polyurethane (PU) top coat provides further increase in the level of protection (≈100%). After damage with a scribe and exposure to UV, the presence of healed epoxy is confirmed by confocal Raman and fluorescent spectroscopy. The anticorrosion performance of healed coatings on steel substrates is assessed after exposure to a simulated saltwater solution. The UV‐curable, self‐healing coating exhibits significantly less corrosion than a control coating with no self‐healing ability.
The corrosion of
steel substrates causes damage that is costly
to repair or replace. Current protective coatings predominately rely
on environmentally harmful anticorrosive agents and toxic solvents
to protect the underlying substrate. The use of lawsone (2-hydroxy-1,4-napthoquinone)
together with a water-based epoxy coating provides an environmentally
friendly alternative for common protective coatings. Microencapsulated
lawsone embedded in an epoxy coating allows the anticorrosive agent
to remain dormant until released by damage and delivered directly
onto the steel substrate. UV–vis analysis confirms successful
encapsulation of lawsone in a polyurethane shell wall and reveals
up to 8 wt % lawsone in the capsule cores. Uniform dry film thickness
and inflicted damaged are verified with ultrasound and optical microscopy.
Visual and electrochemical analysis demonstrates that this self-protective
scheme leads to a 70% corrosion inhibition efficiency in a neutral
salt water solution.
Polycrystalline thin films of chromium doped tungsten disulphide (WS2) have been deposited onto glass and steel substrates by Aerosol-Assisted Chemical Vapour Deposition (AACVD) at 450 °C.
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