CdSe nanocrystals (NCs) were grafted on chiral silica nanoribbons, and the mechanism of resulting chirality induction was investigated. Because of their chiral organization, these NCs show optically active properties that depend strongly on their grafting densities and sizes of the NCs. The effect of the morphology of the chiral silica templates between helical (cylindrical curvature) vs twisted (saddle like curvature) ribbons was investigated. The g-factor of NCs-silica helical ribbons is larger than that of the NCs-silica twisted ribbons. Finally, rod-like NCs (QR) with different lengths were grafted on the twisted silica ribbons. Interestingly, their grafting direction with respect to the helix surface changed from side-grafting for short QR to tip-grafting for long rods and the corresponding CD spectra switched signs.

中文翻译：

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在二氧化硅纳米螺旋上自组织的 CdSe 纳米晶体的手性诱导：调整手性特性

将 CdSe 纳米晶体 (NCs) 接枝在手性二氧化硅纳米带上，并研究了手性诱导的机制。由于它们的手性组织，这些 NCs 显示出光学活性特性，这在很大程度上取决于它们的接枝密度和 NCs 的大小。研究了螺旋（圆柱曲率）与扭曲（鞍状曲率）带之间的手性二氧化硅模板形态的影响。该摹NCs-二氧化硅螺旋带的系数大于NCs-二氧化硅扭曲带的系数。最后，将不同长度的棒状 NCs (QR) 接枝在扭曲的二氧化硅带上。有趣的是，它们相对于螺旋表面的接枝方向从短 QR 的侧接转变为长棒的尖端接枝，相应的 CD 光谱转换了符号。