Abstract
ZnS:Mn nanocrystals thin film was fabricated at 300°C and 500°C via the spin coating method. Its sol-gel was spin coated for 20 s at 3000 rpm and 4000 rpm with metal tape being used to mold the shape of the thin film. A different combination of these parameters was used to investigate their influences on the fabrication of the film. Optical and structural characterizations have been performed. Optical characterization was analyzed using UV-visible spectroscopy and photoluminescence spectrophotometer while the structural and compositional analysis of films was measured via field emission scanning electron microscopy and energy dispersive X-ray. From UV-vis spectra, the wavelength of the ZnS:Mn was 250 nm and the band gap was within the range 4.43 eV–4.60 eV. In room temperature PL spectra, there were two emission peaks centered at 460 nm and 590 nm. Under higher annealing temperature and higher speed used in spin coating, an increase of 0.05 eV was observed. It was concluded that the spin coating process is able to synthesize high quality spherical ZnS:Mn nanocrystals. This conventional process can replace other high technology methods due to its synthesis cost.
Highlights
zinc sulphide doped manganese (ZnS) is one of the most studied nanomaterials
The first peak was produced within wavelength ranging from 350 to 450 nm. This is evident to the recombination of electron trapped in the energy gap of ZnS [23]
Spherical ZnS:Mn nanocrystals thin films with grain size of 21.8–36.8 nm have been fabricated via spin coating method with thin film being molded by a metal tape at the spin coating stage
Summary
It is relatively easy to fabricate the nanomaterial with the intended optical and electrical properties through controlling the shape of its nanostructure [1, 2] It has a wide energy band gap with a value of 3.68 eV for cubic phase and 3.77 eV for hexagonal phase [3,4,5,6,7,8,9,10]. Mn2+ produces orange emission while Cu2+ produces green emission [16,17,18,19] Parameters such as annealing temperature and speed of rotation were used in these experiments to investigate their influence on the fabrication of nanocrystalline thin film. This work aims to identify the characteristics of zinc sulphide doped manganese (ZnS:Mn) fabricated using several combinations of annealing temperatures and speeds of spin coating
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