A Silver Nanocluster Containing Interstitial Sulfur and Unprecedented Chemical Bonds

The emergence of thiolated metal nanoclusters provides opportunities to identify significant and unprecedented phenomena because they are at quantum sizes and can be characterized with X‐ray crystallography. Recently silver nanoclusters have received extensive interest owing to their merits, such as low‐cost and rich properties. Herein, a thiolated silver nanocluster [Ag₄₆S₇(SPhMe₂)₂₄]NO₃ (Ag₄₆ for short) with a face‐centered cubic (fcc) structure was successfully synthesized and structurally resolved by X‐ray analysis. Most importantly, interstitial sulfur was found in the lattice void of Ag₄₆ without lattice distortion or expansion, indicating that the classic theory of interstitial metal solid solutions might be not applicable at quantum size. Furthermore, unprecedented chemical bonds and unique structural features (such as asymmetrically coordinated μ₄‐S) were found in Ag₄₆ and might be related to the interstitial sulfur, which is supported by natural population analyses.     

一步水热法制备铜掺杂纳米碳点及其在白光器件中的应用

以一水合乙酸铜和苯胺为原料, 合成了铜掺杂纳米碳点(Cu-CDs). 通过优化实验参数, 确定了合成Cu-CDs的最佳反应时间、 反应温度和原料摩尔比分别为5 h, 210 ℃和1∶1. 与相同条件下的对照实验相比, Cu的掺杂使碳点(CDs)的荧光强度明显提高, 并实现了良好的多色发光性能. 在365 nm紫外光激发下, Cu-CDs可直接发射强烈的白光. 进一步与紫外发光二极管(LED)芯片结合, 得到白色发光器件, 色坐标为(0.337, 0.337), 非常接近纯白光的色坐标(0.33, 0.33). 这种制备Cu-CDs材料的方法及突出的白光发射性能, 拓宽了碳点在发光器件中的应用.