From Binary Cu2S to Ternary Cu-In-S and Quaternary Cu-In-Zn-S Nanocrystals with Tunable Composition via Partial Cation Exchange
From Binary Cu2S to Ternary Cu-In-S and Quaternary Cu-In-Zn-S Nanocrystals with Tunable Composition via Partial Cation Exchange
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DOI：
10.1021/nn505786d
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发表时间：
2015-01-01
期刊：
影响因子：
17.1
通讯作者：
Lesnyak, Vladimir
中科院分区：
文献类型：
--
作者：
Akkerman, Quinten A.;Genovese, Alessandro;Lesnyak, Vladimir
本文提出了用In3+和Zn2+部分阳离子交换合成三元铜铟硫化（CIS）和季铜铟锌硫化（CIZS）纳米晶体（NCs）的方法。该方法由连续的三步合成组成：首先，合成二元Cu2S NCs，然后通过原位部分阳离子交换反应将In3+均匀结合，得到CIS NCs。在最后一步中，进行了第二次部分交换，其中Zn2+部分取代了表面的Cu+和In3+阳离子，形成了一个富含zns的壳层，并保留了尺寸和形状。通过仔细调整反应参数（生长和交换时间以及初始Cu+:In3+:Zn2+比例），实现了对尺寸和组成的控制。这导致在不改变纳米尺寸的情况下，最终的CIZS纳米的光致发光范围从880到1030 nm广泛调整。细胞毒性试验证实了合成的CIZS NCs的生物相容性，这为其作为近红外荧光标记物在生物医学领域的应用开辟了机会。
We present an approach for the synthesis of ternary copper indium sulfide (CIS) and quaternary copper indium zinc sulfide (CIZS) nanocrystals (NCs) by means of partial cation exchange with In3+ and Zn2+. The approach consists of a sequential three-step synthesis: first, binary Cu2S NCs were synthesized, followed by the homogeneous incorporation of In3+ by an in situ partial cation-exchange reaction, leading to CIS NCs. In the last step, a second partial exchange was performed where Zn2+ partially replaced the Cu+ and In3+ cations at the surface, creating a ZnS-rich shell with the preservation of the size and shape. By careful tuning reaction parameters (growth and exchange times as well as the initial Cu+:In3+:Zn2+ ratios), control over both the size and composition was achieved. This led to a broad tuning of photoluminescence of the final CIZS NCs, ranging from 880 to 1030 nm without altering the NCs size. Cytotoxicity tests confirmed the biocompatibility of the synthesized CIZS NCs, which opens up opportunities for their application as near-infrared fluorescent markers in the biomedical field.