Abstract
Manganese tungstate (MnWO4) nanoparticles were synthesized at room temperature by chemical precipitation method. The effect of high energy electron beam (EB) irradiation on the optical properties of MnWO4nanoparticles was investigated. The absorption spectra, photoluminescence intensity, and Raman bands of the irradiated samples were modified, which has been attributed to defects and particle size variation. The present investigation found that the beam irradiation is a new and efficient method to enhance the optical absorption performance and photoactivity of MnWO4nanoparticles.
Highlights
Nanostructured tungstate materials have aroused much interest because of their luminescence behaviour, structural properties, and potential applications
The results show that average particle size decreases with the electron beam (EB) irradiation dose and suggest the possible control of the size and the density of the MnWO4 nanoparticles by EB irradiation
It can be seen that PL spectra of the irradiated samples S2 and S3 were broadened. This broadening of MnWO4 nanoparticles might originate from the surface band bending and lattice expansion with particle size reduction caused by the EB irradiation [16]
Summary
Nanostructured tungstate materials have aroused much interest because of their luminescence behaviour, structural properties, and potential applications. The electrical conductivity of MnWO4 is sensitive to changes in humidity, thereby making it useful as a humidity sensor with potential applications like meteorology, medicine, food production, agriculture, and industrial and domestic environment [4, 5]. There are a number of processes used to synthesize nanocrystalline MnWO4, such as microwave-assisted synthesis [1], surfactant-assisted complexation-precipitation method [2], melt solution process [6], solvothermal route [7], aqueous salt metathesis reaction [8], sol-gel technique [4, 9], ambient template synthesis [10], and solid state metathetic approach [11]. The optical properties of the pure and EB irradiated samples of MnWO4 nanoparticles were evaluated in context of the band gap
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