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Linseed oil and poly(urea-formaldehyde)-based microcapsules with an 82% weight ratio of core/shell and a mean outer diameter of about 100 μm were synthesised by in-situ polymerisation. These microcapsules were dispersed in polyester paint and then primer-coated Galvalume sheets were painted with microcapsule loaded (MC) and neat (no microcapsules) paints. These painted samples were scribed and examined using various characterisation techniques to evaluate their self-healing properties. SST and CCT showed that the electrolyte diffusion was suppressed in the MC sample, whereas the neat sample was noticeably blistered due to under-film corrosion. Scanning Kelvin Probe microscopy, SKP supported this finding wherein the Volta potential of the neat sample increased in the positive direction indicating cathodic delamination, whereas no significant change occurred in the MC sample. SEM-EDAX revealed the surface morphology and composition of the samples. Furthermore, EIS showed that microcapsule addition increased the pore resistance and decreased the coating capacitance of the polyester paint. [ABSTRACT FROM AUTHOR]

UV sensors possess high importance for modern electronics such as environmental monitoring, health diagnostics, and optoelectronic devices. Thus UV-sensing-materials with high stability has drawn significant interest for next generation UV sensors. Herein, a simple synthesis method of SbPS 4 has been proposed. Then the SbPS 4 crystals are effectively delaminated by micromechanical exfoliation into a few-nanometer-scale nanowires, which is the first demonstration of the material's possibility of exfoliation down to one-molecular-layer thickness. Weak van der Waals (vdW) interaction within the crystal lattice can be easily overcome. The exfoliated SbPS 4 nanowires showed one-dimensional tube structure, and the work function of SbPS 4 showed strong thickness dependence and was confirmed through Scanning Kelvin probe microscopy. The bandgap of 2.54 eV of SbPS 4 , showed great sensitivity to UV lights, depicting SbPS 4 as a promising future UV sensing material for future optoelectronic application. [Display omitted] • Synthesis of one-dimensional van der Waals material SbPS 4 with a tubular molecular structure • Single chain exfoliation of SbPS 4 and its thickness-dependency of work function • Optical property of SbPS 4 as UV-detecting material [ABSTRACT FROM AUTHOR]

Two-dimensional ultrathin ferroelectrics have attracted much interest due to their potential application in high-density integration of non-volatile memory devices. Recently, 2D van der Waals ferroelectric based on interlayer translation has been reported in twisted bilayer h-BN and transition metal dichalcogenides (TMDs). However, sliding ferroelectricity is not well studied in non-twisted homo-bilayer TMD grown directly by chemical vapor deposition (CVD). In this paper, for the first time, experimental observation of a room-temperature out-of-plane ferroelectric switch in semiconducting bilayer 3R MoS 2 synthesized by reverse-flow CVD is reported. Piezoelectric force microscopy (PFM) hysteretic loops and first principle calculations demonstrate that the ferroelectric nature and polarization switching processes are based on interlayer sliding. The vertical Au/3R MoS 2 /Pt device exhibits a switchable diode effect. Polarization modulated Schottky barrier height and polarization coupling of interfacial deep states trapping/detrapping may serve in coordination to determine switchable diode effect. The room-temperature ferroelectricity of CVD-grown MoS 2 will proceed with the potential wafer-scale integration of 2D TMDs in the logic circuit., (© 2024 Wiley‐VCH GmbH.)