ZnS thin film has wide applications in optoelectronics area, including photocatalysis and solar cells. The water bath is a popular ZnS thin film fabrication method, with merits of high efficiency, easy-operation, low cost, and uniform deposition. In this report, ZnSO<sub>4</sub>7H<sub>2</sub>O and thiourea were mixed in the water bath for reaction at a constant temperature with mechanical stirring. Thus-deposited ZnS thin film was then annealed in Ar. The impacts of different pH, different concentration, different water bath temperature, and different annealing temperature and time were studied to find the optimal condition. The optimal results were as follows: the mixture of 0.056mol/L thiourea and 0.0532mol/L ZnSO<sub>4</sub>7H<sub>2</sub>O in water was titrated to pH=10.7 by ammonia, followed by water bath reaction at 85°C, then annealed in Ar at 300°C for 1.5h. Thus fabricated ZnS thin film has the best surface flatness and film uniformity, with high optical transmittance.
The silver nanoparticle (AgNP) based conducting wire is a fundamental element of flexible electronic devices, especially in the printing electronics area. Its resistance change mechanisms under pressure is of both scientific interest and practical importance. AgNP-based conducting wires were fabricated on flexible substrates by electrospraying printing technology, and three possible resistance change mechanisms were studied: vertical deformation (VD) of the AgNP wire due to vertical pressure, horizontal wire elongation (HWE) along with the flexible substrate due to vertical pressure, and local micro deformation (LMD) at the touching edge. Analysis of the experiment data revealed that the resistance change due to VD was negligible, the resistance change due to PWE was one order of magnitude smaller than the measured value, and the resistance change due to PWE was the dominating mechanism.
Acrylic (PMMA) possesses excellent optical transparency, good chemical stability as well as many other merits such as the feasibilities in dyeing and manufacturing. But its poor hardness and wear resistance restrict its industrialized applications. In order to improve the hardness and wear resistance, SiO<sub>2</sub> films were coated on PMMA substrates by both dip coating method and aerosol spraying method in this work. Heating curing method was carried out after the coating of SiO<sub>2</sub> film, and consequently, the mechanical properties, optical properties and surface morphology were characterized and compared. The experimental results showed that the SiO<sub>2</sub> films prepared by aerosol spraying method has a better performance in both hardness and wear resistance, compared with the films prepared by dip coating method. In the optimized conditions, the hardness of the PMMA was improved from 3H to ~8H, and the non-abrasion rubbing times increased from less than 100 times to 5000 times with a loading of 500g weight after the coating of SiO<sub>2</sub> film, indicating the improvement of the wear resistance.