One-pot aqueous synthesis of cysteine-capped CdTe/CdS core–shell nanowires
One-pot aqueous synthesis of cysteine-capped CdTe/CdS core–shell nanowires
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DOI：
10.1007/s11051-014-2420-4
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发表时间：
2014-04
影响因子：
2.5
通讯作者：
Y. Shan;Zhen Xiao;Y. Chuan;Hongli Li;Minglong Yuan;Zhen Li;Shixue Dou
中科院分区：
文献类型：
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作者：
Y. Shan;Zhen Xiao;Y. Chuan;Hongli Li;Minglong Yuan;Zhen Li;Shixue Dou
在水溶液中，CdCl 2与NaHTe在100 °C恒温反应140 min，成功合成了高荧光半胱氨酸修饰的CdTe/CdS核壳纳米线。反应时间从10 min增加到140 min时，CdTe/CdS纳米晶逐渐生长为纳米棒，最终完全演化为纳米线。纳米线表面具有氨基和羧基官能团，可以很好地分散在水溶液中。由于半胱氨酸的独特性质和在CdTe核表面上形成CdS壳层，所制备的CdTe/CdS纳米线显示出7.25%的荧光量子产率（QY），它们具有较窄的直径分布（d= ~5 nm）和在175-275 nm范围内的长度，并且它们的纵横比在1/35和1/55之间。
Highly fluorescent cysteine-capped CdTe/CdS core–shell nanowires were successfully synthesized by reacting CdCl2with NaHTe in aqueous solution under refluxing at 100 °C for 140 min. On increasing the reaction time from 10 to 140 min, CdTe/CdS nanocrystals gradually grew into nanorods and eventually completely evolved into nanowires. The nanowires have amino and carboxyl functional groups on their surfaces and can be well dispersed in aqueous solution. The as-prepared CdTe/CdS nanowires show a fluorescence quantum yield (QY) of 7.25 % due to the unique nature of cysteine and the formation of a CdS shell on the surface of the CdTe core, they have a narrower diameter distribution (d= ~5 nm) and a length in the range of 175–275 nm, and their aspect ratio is between 1/35 and 1/55.