Optoelectronic Materials Section, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.
Nanoscale. 2018 Jun 14;10(23):11110-11116. doi: 10.1039/c8nr02381f.
Indium antimonide (InSb) quantum dots (QDs) have unique and interesting photophysical properties, but widespread experimentation with InSb QDs is lacking due to the difficulty in synthesizing this material. The key experimental challenge in fabricating InSb QDs is preparing a suitable Sb-precursor in the correct oxidation state that reacts with the In-precursor in a controllable manner. Here, we review and discuss the synthetic strategies for making colloidal InSb QDs and present a new reaction scheme yielding small (∼1 nm diameter) InSb QDs. This was accomplished by employing Sb(NMe2)3 as the antimony precursor and by screening different reducing agents that can selectively reduce it to stibine in situ. The released SbH3, subsequently, reacts with In carboxylate to form small InSb clusters. The absorption features are moderately tunable (from 400 nm to 660 nm) by the amount and rate of reductant addition as well as the temperature of injection and subsequent annealing. Optical properties were probed with transient absorption spectroscopy and show complex time and spectral dependencies.
铟锑量子点 (InSb QDs) 具有独特而有趣的光物理性质，但由于难以合成这种材料，因此广泛的 InSb QDs 实验研究较少。制备 InSb QDs 的关键实验挑战是制备合适的 Sb 前体，使其处于正确的氧化态，并以可控的方式与 In 前体反应。在这里，我们回顾并讨论了制备胶体 InSb QDs 的合成策略，并提出了一种新的反应方案，可得到小尺寸（直径约为 1nm）的 InSb QDs。该方案使用 Sb(NMe2)3 作为 Sb 前体，并筛选了不同的还原剂，可选择性地将其原位还原为 SbH3。随后，释放的 SbH3 与 In 羧酸酯反应形成小的 InSb 团簇。通过添加还原剂的量和速率以及注入和随后退火的温度，可适度调节吸收特征（从 400nm 到 660nm）。用瞬态吸收光谱研究了光学性质，发现其具有复杂的时间和光谱依赖性。
