Colloidal nanorod heterostructures consisting of multiple quantum dots within a nanorod (n-DNRs, where n is the number of quantum dots within a nanorod) are synthesized with alternating segments of CdSe “dot” and CdS “rod” via solution heteroepitaxy. The reaction temperature, time dependent ripening, and asymmetry of the wurtzite lattice and the resulting anisotropy of surface ligand steric hindrance are exploited to vary the morphology of the growing quantum dot segments. The alternating CdSe and CdS growth steps can be easily repeated to increment the dot number in unidirectional or bidirectional growth regimes. As an initial exploration of electron occupation effects on their optical properties, asymmetric 2-DNRs consisting of two dots of different lengths and diameters are synthesized and are shown to exhibit a change in color and an unusual photoluminescence quantum yield increase upon photochemical doping.

中文翻译：

---

胶体多点纳米棒

由纳米棒内的多个量子点（n -DNRs，其中n是纳米棒内的量子点的数量）组成的胶体纳米棒异质结构是通过溶液异质外延与CdSe“点”和CdS“棒”的交替片段合成的。利用反应温度、时间依赖性成熟、纤锌矿晶格的不对称性以及由此产生的表面配体空间位阻的各向异性来改变生长的量子点片段的形态。可以轻松地重复交替的 CdSe 和 CdS 生长步骤，以增加单向或双向生长方案中的点数量。作为电子占据对其光学性质影响的初步探索，合成了由两个不同长度和直径的点组成的不对称2-DNR，并显示出在光化学掺杂后表现出颜色变化和不寻常的光致发光量子产率增加。