In a recent letter, Baik et al. demonstrated that the ions trapped by carbon nanotubes (CNTs) markedly reduced the residual dc, which is related to an image sticking problem in liquid crystal displays. The curve of transmission versus applied dc voltage revealed that the doped CNTs considerably depress the hysteresis in the transmission curve, because the large electron affinity of CNTs induces strong charge transfer from the adjacent liquid crystal (LC) molecules, causing the excess ions in the LC mixture to be trapped by the doped CNTs. Baik et al. also successfully explained the results using density functional calculations with the local density approximation. Lee et al. reported a similar result but did not clarify the origin of the reduction in hysteresis. The aforementioned experiments used different LC materials (Baik et al. used superfluorinated LC mixture, while Lee et al. used 5CB), suggesting that LC material is not critical in reducing hysteresis.
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