College of Medical Laboratory, Dalian Medical University, No. 9 West Section Lvshun South Road, Dalian 116044, PR China.
College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China.
Inorg Chem. 2020 May 4;59(9):5975-5982. doi: 10.1021/acs.inorgchem.9b03768. Epub 2020 Apr 14.
Herein, we present a facile colloidal method to synthesize the high-quality AgGaS nanocrystals (NCs) within 2 min via exploiting the high-reactivity S precursor and then extend this synthetic strategy to the preparation of AgGaS/ZnS core-shell NCs by a one-pot method without prior purification of AgGaS core. The as-synthesized samples were structurally characterized to confrim the formation of AgGaS/ZnS core-shell NCs. The energy band gap of the AgGaS/ZnS NCs can be effectively tunable from 2.98 to 2.83 eV by the control of their nonstoichiometry and further continuously decreases to 1.90 eV by the preparation of alloyed AgGaInS/ZnS NCs (1 ≤ ≤ 0). Benefitting from the efficient band gap modulations, the photoluminescence (PL) colors of the AgGaS-based NCs can cover almost the whole visible region from blue (460 nm) to red (671 nm). Our work demonstrates the one-pot synthesis of AgGaS/ZnS core-shell NCs and their band gap engineering, which is of crucial in scalability toward industrial application and in tailoring optical characteristics of I-III-VI materials.
在这里，我们提出了一种简便的胶体方法，通过利用高反应性 S 前体制备高质量的 AgGaS 纳米晶体（NCs），在 2 分钟内即可完成，并通过一锅法将该合成策略扩展到制备 AgGaS/ZnS 核壳 NCs，无需预先纯化 AgGaS 核。对合成的样品进行了结构表征，以确认形成了 AgGaS/ZnS 核壳 NCs。通过控制其非化学计量比，AgGaS/ZnS NCs 的能隙可有效调谐为 2.98-2.83 eV，并通过制备合金化的 AgGaInS/ZnS NCs（1 ≤ ≤ 0）进一步连续降低至 1.90 eV。得益于高效的能带调谐，基于 AgGaS 的 NCs 的光致发光（PL）颜色可以覆盖从蓝色（460nm）到红色（671nm）的整个可见光区域。我们的工作展示了 AgGaS/ZnS 核壳 NCs 的一锅法合成及其能带工程，这对于向工业应用的可扩展性和调整 I-III-VI 材料的光学特性至关重要。
