Research comparing the advantages of spin coating and chemical bath deposition is going, and there are varied views on these methods. Here, we used spin coating and chemical bath deposition to prepare thin films of ZnS nanoparticles. The film was analysed by photoluminescence (PL) spectrophotometry, field emission scanning electron microscopy (FE-SEM), ultraviolet spectroscopy (UV-Vis), and energy-dispersive X-ray (EDX) spectroscopy. The UV-Vis spectra revealed that the wavelength of ZnS is between 220 nm - 320 nm while the PL spectra showed a peak centred in the blue region. Both spin coating and chemical bath deposition rendered spherical nanoparticles but of different sizes 17.9 nm and 21.2 -25.7 nm, respectively. It was concluded that each method has its potential. This work can help researchers choose a suitable method for fabricating thin films, depending on the aims and objectives of their work.
We have reported herein a novel self-assembly horizontal submersion process for the deposition ofnanostructured manganese dioxide thin films on metalized plastic supporting substrates at ambient temperatureand pressure. Uniform manganese dioxide thin films were deposited directly onto metallized plastic supportingsubstrate via the spontaneous assembly of preformed manganese dioxide nanoparticles in the form of stablecolloidal suspension. This process affords a facile approach for the deposition of manganese dioxide thin filmsby simply repeating the submersion process after the prior deposited layer had been air-dried completely. Thinfilmdeposition process initially occurred through the spontaneous adsorption of manganese dioxidenanoparticles onto specific surface sites of the metalized substrate. Subsequent events of particle growth,clusters formation, and aggregation or self-organization of particle clusters eventually led to the deposition ofnanostructured thin films which were nanoparticulate and highly porous in nature. The surface morphologicalcharacteristics of deposited thin films were observed to be significantly affected by the duration of submersionand the post-deposition calcination temperature. By modulating and optimizing these parameters, thin films oftailored microstructure could therefore be prepared. Optimized manganese dioxide thin films were observed toexhibit excellent capacitive behavior as evidenced by the almost perfectly rectangular shape of cyclicvoltamograms within the potential range of 0.0 to 1.0 V (versus SCE) in mild aqueous Na2SO4 electrolyte. Thecycling stability and reversibility of these films were evaluated by prolonged charge-discharge cycling and nosubstantial deterioration of performance in terms of charge capacity and capacitive behaviors were observedafter 1000 cycles. We speculate that the high capacitance value exhibited by self-assembled manganese dioxidethin films in mild aqueous electrolyte could be attributed to reversible and homogenous intercalation anddeintercalation of protons during the charge and discharge cycling. The potential utility of self-assembledmanganese dioxide thin films for the fabrication of electrochemical devices, in particular thin-filmelectrochemical capacitors is therefore envisaged.
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