While it is well understood that controlling anisotropic nanostructure growth can be accomplished by establishing kinetic growth conditions, the practical translation of this knowledge to access nanorods with a specific aspect ratio has not been realized. In this study we empirically determine the precursor consumption rates for growing nanorods and use this data to customize the size and shape of anisotropic nanostructures. The purpose of this work is to go beyond simply creating a set of growth conditions to obtain rods, dots, rice, and tetrapods by describing how to synthesize a nanomaterial of desired dimensions and aspect ratio in a pre-meditated fashion. Measured growth rates for model systems of CdSe (3.5 monomers rod⁻¹ s⁻¹ at 250 °C) and CdS nanorods (36 monomers rod⁻¹ s⁻¹ at 340 °C) were used to design elongated nanorods with enhanced aspect ratios and synthesize dot in rod CdS/CdSe and CdSe/CdS heterostructures. These model systems enable us to establish a rubric for the synthesis of customizable nanostructures and serve as a test case for understanding heterostructure assembly in colloidal systems.

中文翻译：

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动力学控制的硫族化物镉纳米棒的组装和纳米棒的异质结构

虽然众所周知可以通过建立动力学生长条件来控制各向异性纳米结构的生长，但是尚未实现该知识的实用翻译以接近具有特定纵横比的纳米棒。在这项研究中，我们凭经验确定生长中的纳米棒的前驱物消耗率，并使用此数据来自定义各向异性纳米结构的尺寸和形状。这项工作的目的是通过描述如何以预先冥想的方式合成具有所需尺寸和纵横比的纳米材料，而不仅仅是简单地创建一组生长条件以获得棒，点，大米和四足动物。CdSe（3.5个单体棒，在250°C下为^-1 s ^-1）和CdS纳米棒（36个单体棒，其模型系统的测量增长率）^使用-1 s ^-1（在340°C下）设计具有增强纵横比的细长纳米棒，并合成棒CdS / CdSe和CdSe / CdS异质结构中的点。这些模型系统使我们能够为合成可定制的纳米结构建立规则，并成为了解胶体系统中异质结构组装的测试案例。