Synthesis of Water-Soluble CuInS2 Quantum Dots by a Hydrothermal Method and Their Optical Properties
Synthesis of Water-Soluble CuInS2 Quantum Dots by a Hydrothermal Method and Their Optical Properties
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DOI：
10.1246/bcsj.20180399
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发表时间：
2019-05-01
影响因子：
4
通讯作者：
Kim, DaeGwi
中科院分区：
文献类型：
--
作者：
Iida, Kazutaka;Uehigashi, Yota;Kim, DaeGwi
以N-乙酰基-L-半胱氨酸（NAC）为稳定剂，水热法制备了水溶性CuInS 2（CIS）量子点，并对水热法制备NAC修饰的CIS量子点的最佳条件进行了研究。在最佳条件下合成的CIS量子点的光致发光（PL）量子产率（QY）为4%，这与水溶性CIS核量子点的最高QY相当。ZnS壳层的引入产生了CIS/ZnS核/壳量子点，并进一步将PL QY提高到30%。此外，利用Au纳米粒子的局域表面等离子体共振，采用层层叠加法制备了由Au纳米粒子和CIS/ZnS量子点组成的双层结构，以增强CIS/ZnS量子点的发光。
Water-soluble CuInS2 (CIS) quantum dots (QDs) were hydrothermally prepared in the presence of N-acetyl-L-cysteine (NAC) as a stabilizer, and the optimal hydrothermal synthetic conditions for NAC-capped CIS QDs were investigated. The photoluminescence (PL) quantum yield (QY) of the CIS QDs synthesized under optimal conditions was 4%, which was comparable with the highest QY reported for water-soluble CIS core QDs. The introduction of a ZnS shell produced CIS/ZnS core/shell QDs and further increased the PL QY to 30%. Furthermore, bilayer structures consisting of Au nanoparticles and CIS/ZnS QDs were fabricated using a layer-bylayer method to enhance the PL of the CIS/ZnS QDs on the basis of the localized surface plasmon resonance of Au nanoparticles.