Nanofabricated optical tuning and epitaxial overgrowth of In2S3 shell on CdSe core
Nanofabricated optical tuning and epitaxial overgrowth of In2S3 shell on CdSe core
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CdSe 核上 In2S3 壳的纳米加工光学调谐和外延过度生长
DOI：
10.1039/c6nj03374a
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Oluwasesan Adegoke and Enoch Y. Park
中科院分区：
文献类型：
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作者：
Adegoke O;Morita M;Kato T;Ito M;Suzuki T;Park EY.;Oluwasesan Adegoke and Enoch Y. Park
我们在这里报告一个新的II型核/壳量子点（QD）结构和一个新的制造策略，通过利用有机金属热注入路线外延钝化的表面的CdSe与无毒的In 2S 3壳层。为了最大限度地减少界面表面缺陷，六个有机封端配体，即1-十二烷基乙基，三辛基膦，油酸，十六烷基胺，油胺和月桂酸锚定到量子点的表面上。通过与L-谷胱甘肽（GSH）的配体交换反应，将有机相量子点成功转移到水溶性相。GSH功能化的CdSe/In 2S 3量子点表现出改善的结晶度的CdSe核心，单分散的粒径分布，高胶体稳定性在水溶液中和尺寸可调的光学性质，这反映在荧光量子产率（QY）的变化从12到97%。量子点的晶格应变和荧光QY之间的直接关系表明，在量子限制的制度，量子点夹在辐射和非辐射发射状态。高质量的光学性质和无毒特性意味着量子点可应用于化学和生物领域内的广泛应用。
We report here a new type-II core/shell quantum dot (QD) structure and a new fabrication strategy via utilization of the organometallic hot-injection route to epitaxially passivate the surface of CdSe with a nontoxic In2S3 shell layer. To minimize interfacial surface defects, six organic capping ligands namely 1-dodecanethiol, trioctylphosphine, oleic acid, hexadecylamine, oleylamine and lauric acid were anchored onto the surface of the QDs. Successful transfer of the organic-phase QDs to the water-soluble phase was carried out via a ligand exchange reaction with L-glutathione (GSH). The GSH-functionalized CdSe/In2S3 QDs exhibited improved crystallinity over the CdSe core, monodisperse particle size distribution, high colloidal stability in aqueous solution and size-tunable optical properties, which were reflected in the variation of the fluorescence quantum yield (QY) from 12 to 97%. A direct relationship between the lattice strain and fluorescence QY of the QDs indicated that within the regime of quantum confinement, the QDs were sandwiched between radiative and nonradiative emission states. The high quality optical properties and nontoxic characteristics imply that the QDs are applicable to a wide array of applications within the chemical and biological domains.