Nanocrystal Precursor Incorporating Separated Reaction Mechanisms for Nucleation and Growth to Unleash the Potential of Heat-Up Synthesis.
Nanocrystal Precursor Incorporating Separated Reaction Mechanisms for Nucleation and Growth to Unleash the Potential of Heat-Up Synthesis.
复制标题
纳米晶体前驱体结合了成核和生长的分离反应机制，释放了加热合成的潜力。
作者：
Joonhyuck Park;A. Jayaraman;Xudong Wang;J. Zhao;Hee
用于量子点（QD）合成的加热方法具有其简单性、可扩展性和高再现性，对于大规模生产具有独特的益处。然而，它的应用受到了限制，因为它不可避免地在成核和生长阶段之间产生强烈的重叠。我们通过引入具有用于成核和生长的分离的反应路径的前体来解决这个长期存在的问题。与现有的前体不同，现有的前体采用两种反应的共用中间体，9-巯基-9-硼双环[3.3.1]壬烷（BBN-SH）通过表面辅助转化诱导生长，并通过溶液中的簇形成驱动成核。此外，这种前体化学嵌入了一种有效的机制来抑制生长过程中的成核。因此，BBN-SH允许基于加热的高质量壳的生长，其与通过注射方法产生的壳相当。还值得注意的是，基于BBN-SH的加热合成显示出对温度波动的减轻的敏感性;因此，它非常适合于工业规模的反应。我们建立了一个简单的，可扩展的，和经济的方案，为核/壳量子点，通过简化定量核合成和加热为基础的壳生长，并表明该方案产生的量子点的质量相当的传统方法产生的。在这里，我们介绍了一种前体，它驱动着一种独特的纳米颗粒生长模式。我们希望我们的研究能够启发其他前体的设计，并释放热合成的全部潜力。
A heat-up method for quantum dots (QDs) synthesis holds distinctive benefits for large-scale production with its simplicity, scalability, and high reproducibility. Its applications, however, have been limited because it inevitably yields a strong overlap between the nucleation and growth stages. We addressed this long-standing problem by introducing a precursor having separated reaction paths for nucleation and growth. Unlike existing precursors, which employs a shared intermediate for both reactions, 9-mercapto-9-borabicyclo[3.3.1]nonane (BBN-SH) induces growth via surface-assisted conversion and drives nucleation via cluster formation in solution. Furthermore, this precursor chemistry embeds an efficient mechanism to suppress nucleation during growth. As such, BBN-SH allows heat-up-based growth of high-quality shells that are comparable to those created by the injection method. It is also notable that BBN-SH-based heat-up synthesis shows mitigated sensitivity to temperature fluctuation; therefore, it is highly suitable for industrial-scale reactions. We established a simple, scalable, and economic scheme for core/shell QDs by streamlining quantitative core synthesis and heat-up-based shell growth and showed that the scheme produces QDs of comparable quality to those produced by the traditional method. Here, we introduce a precursor that drives a distinctive mode of nanoparticle growth. We anticipate our study to inspire the design of other precursors and unleash the full potential of heat-up synthesis.
影响因子：
15
作者：
Han HS;Devaraj NK;Lee J;Hilderbrand SA;Weissleder R;Bawendi MG
通讯作者：
Bawendi MG
影响因子：
41.2
作者：
Chen O;Zhao J;Chauhan VP;Cui J;Wong C;Harris DK;Wei H;Han HS;Fukumura D;Jain RK;Bawendi MG
通讯作者：
Bawendi MG