Synthesis of ultrasmall quantum dots by redirecting kinetics-based crystal growth to thermodynamics-based crystal dissolution
Synthesis of ultrasmall quantum dots by redirecting kinetics-based crystal growth to thermodynamics-based crystal dissolution
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通过将基于动力学的晶体生长重定向到基于热力学的晶体溶解来合成超小量子点
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Kumar
中科院分区：
文献类型：
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作者：
Hsueh‐Shih Chen;R. Kumar
通过在合成过程中将晶体生长重定向到溶解，已经合成了超小量子点（<2nm）。重定向是用受控的淬火-等温退火工艺进行的，其中量子点首先生长，然后淬火到较低的温度，然后在等温退火工艺中热致减小尺寸。所合成的超小量子点具有高质量，其光致发光效率通常大于60%。通过聚合物外涂层，蓝色发光的超小量子点是水分散的，并且稳定超过九个月。
Ultrasmall quantum dots (< 2 nm) have been synthesised by redirecting crystal growth to dissolution during the synthetic process. The redirection is carried out with a controlled quenching–isothermal annealing process, where quantum dots are first grown and then quenched to a lower temperature, followed by thermodynamically reducing the size in an isothermal annealing process. The synthesised ultrasmall quantum dots are of high quality and their photoluminescence efficiency is generally more than 60%. With polymer overcoating, the blue-emitting ultrasmall quantum dots are water dispersible and stable for more than nine months.