According to Wikipedia, ZnS will not melt but it will sublime at 1185 C.
Like most materials, you should expect the sublimation temperature to decrease as you get into the nano-regime (in this case, less than 5 nm.) However, Farrell and Van Siclen [1] have found that for semiconductors, there is less suppression of melting temperature with small size than observed for metals (with the depression approximately proportional to the inverse square of the particle size for semiconductors, compared to the inverse cube of the particle size for metals.)
Thus, unless you are talking about particle sizes of ~2 nm or less, you probably shouldn't expect to see an appreciable depression of the sublimation temperature.
[1] "Binding energy, vapor pressure, and melting point of semiconductor nanoparticles". H. H. Farrell and C. D. Van Siclen. J. Vac. Sci. Technol. B, 25, 1441 (2007)
http://scitation.aip.org/content/avs/journal/jvstb/25/4/10.1116/1.2748415
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