20 May 2011 Microwave mediated synthesis of ZnS spherical nanoparticles for IR optical ceramics
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The existing material choice for long-wave infrared (LWIR) and semi-active laser domes is multispectral zinc sulfide (ZnS), made by chemical vapor deposition. An alternative route to make more erosion-resistant ZnS could be through hot pressing ZnS nanoparticles into small-grain material. We have attempted to produce ZnS nanoparticles both by microwave and microwave-hydrothermal methods. Microwave route produced ultrahigh purity, homogeneous, well dispersed, and uniformly spherical ZnS nanoparticles. Microwave-hydrothermal route produced equiaxed cubic-faceted nanoparticles. The powder X-ray diffraction patterns of ZnS shows the presence of broad reflections corresponding to the (1 1 1), (2 2 0), and (3 1 1) planes of the cubic crystalline ZnS material. The domain size of the particles estimated from the Debye-Scherrer formula for the main reflection (111) gives a value of 2.9 and 2.5 for the microwave and microwave-hydrothermal methods respectively.
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D. Ravichandran, D. Ravichandran, T. Wharton, T. Wharton, B. Devan, B. Devan, R. Korenstein, R. Korenstein, R. Tustison, R. Tustison, S. Komarneni, S. Komarneni, "Microwave mediated synthesis of ZnS spherical nanoparticles for IR optical ceramics", Proc. SPIE 8016, Window and Dome Technologies and Materials XII, 80160K (20 May 2011); doi: 10.1117/12.883557; https://doi.org/10.1117/12.883557

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