Shape Evolution of CdSe Nanoparticles controlled by Halogen Compounds

Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets

Ultrathin two-dimensional nanosheets raise a rapidly increasing interest due to their unique dimensionality-dependent properties. Most of the two-dimensional materials are obtained by exfoliation of layered bulk materials or are grown on substrates by vapor deposition methods. To produce free-standing nanosheets, solution-based colloidal methods are emerging as promising routes. In this work, we demonstrate ultrathin CdSe nanosheets with controllable size, shape and phase. The key of our approach is the use of halogenated alkanes as additives in a hot-injection synthesis. Increasing concentrat…

碳纳米管表面附着的CdSe纳米粒子的三维表征

3D characterization of CdSe nanoparticles attached to carbon nanotubes

通过高分辨透射电子显微镜和高角度环形暗场扫描透射电子显微镜层析成像技术，研究了碳纳米管上的CdSe纳米颗粒的晶体结构。在溶液中与碳纳米管一起生长的CdSe棒状纳米颗粒经历形态转变并附着在碳表面。电子断层扫描显示纳米颗粒是基于六边形的，其中（001）平面与外部石墨烯层外延匹配。

富勒烯类CdSe纳米粒子的光谱分析

Identification of fullerene-like CdSe nanoparticles from optical spectroscopy calculations

半导体纳米颗粒是光学纳米器件的组成部分，因为它们的电子状态，因此可以通过改变它们的尺寸和形状来控制光的吸收和发射。CdSe可能是这些纳米粒子中研究最多的，这是由于其合成的效率，所得样品的高质量，以及光学带隙在可见光范围内的事实。本文利用密度泛函理论研究了尺寸小于1.5 nm的CdSe纳米结构的光吸收。我们研究了具有纤锌矿对称性的大块碎片和新颖的富勒烯样核心笼结构。与最近的实验光谱的比较，使我们能够确认这些富勒烯类CdSe簇的合成。

Metal domain size dependent electrical transport in Pt-CdSe hybrid nanoparticle monolayers

Thin films prepared of semiconductor nanoparticles are promising for low-cost electronic applications such as transistors and solar cells. One hurdle for their breakthrough is their notoriously low conductivity. To address this, we precisely decorate CdSe nanoparticles with platinum domains of one to three nanometers in diameter by a facile and robust seeded growth method. We demonstrate the transition from semiconductor to metal dominated conduction in monolayered films. By adjusting the platinum content in such solution-processable hybrid, oligomeric nanoparticles the dark currents through d…

碳载CdSe纳米晶

Carbon supported CdSe nanocrystals

深入探讨了热注入法制备的CdSe纳米颗粒附着在碳纳米管上的机理。据观察，水的存在下，提高了纳米管的覆盖率，而含氯介质是负责的纳米粒子的形状转变和进一步附着到碳晶格。实验还表明，发生的机制涉及几个因素的正确平衡，即，低钝化的纳米颗粒表面，具有明确定义的结晶面的颗粒，以及与无有机物的sp2碳晶格的相互作用。此外，该过程可以扩展到通过量子点覆盖石墨烯。

用原子对分布函数分析法定量测定CdSe纳米粒子的尺寸依赖结构和应变

Quantitative size-dependent structure and strain determination of CdSe nanoparticles using atomic pair distribution function analysis

采用原子对分布函数（PDF）方法研究了直径为2 ~ 4 nm的CdSe纳米粒子的尺寸结构。测得的CdSe纳米颗粒的核心结构可以用具有广泛堆垛层错的纤锌矿原子结构来描述。纳米颗粒中的缺陷密度约为50%。核心区域的直径直接从PDF数据中提取，并且与从标准表征方法获得的直径非常一致，表明几乎没有表面非晶区域。在Cd-Se键长中测量到压缩应变，其随着粒径减小而增加，相对于2nm直径颗粒的本体CdSe为0.5%。这项研究表明，即使从非常小的纳米粒子使用PDF方法可以获得的大小依赖的定量结构信息。