Ultrarine ZnS nanobelts as field emitters

Single-crystalline, narrow-size-distribution ultrafine ZnS nanobelts (see figure), revealing a notable quantum-confinement effect, have been synthesized at a high yield by controlling the evaporation and agglomeration rates. Field-emission measurements show ultrafine ZnS nanobelts are very good field emitters with a low turn-on field and high field-enhancement factor.