Abstract
We theoretically investigate the dust charging in the sheath of an electronegativeplasma, by using a single dust grain model based on a previous sheathstructure [Chin. Phys. Lett 20 (2003) 1537] in which cold positive ionsand hot negative ions have been assumed. It is found that dust grainsare first charged negatively at the sheath edge and then begin to becharged positively in the sheath. Moreover, both the temperature ratioof electrons to negative ions and the density ratio of negative ions topositive ions have effects on the neutral point of the dust charge.
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