Synthesis and optical properties of thiol-stabilized PbS nanocrystals
Synthesis and optical properties of thiol-stabilized PbS nanocrystals
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DOI：
10.1021/la048730y
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发表时间：
2005-02-01
期刊：
影响因子：
3.9
通讯作者：
Kumacheva, E
中科院分区：
文献类型：
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作者：
Zhao, XS;Gorelikov, I;Kumacheva, E
以1-硫代甘油、二硫代甘油或1-硫代甘油/二硫代甘油混合物为稳定剂，采用一步法室温合成了硫醇封端的水溶性PbS纳米晶(NCS)。我们发现，用TGL/DTG混合物稳定的NCS在第二生物窗口(1050-1200 nm)显示出高效而稳定的红外光致发光。在优化的条件下，荧光发射峰半峰宽为70~100 nm。室温下黑暗保存的PbS纳米粒在2~3个月的时间内对沉淀和聚集稳定。NCS的室温光致发光量子效率为7%~10%。当在37℃下储存时，它们的荧光发射红移，与NC的生长一致。
Thiol-capped water-soluble PbS nanocrystals (NCs) stabilized with 1-thioglycerol, dithioglycerol, or a mixture of 1-thioglycerol/dithioglycerol (TGL/DTG) were prepared via one-stage synthesis at room temperature. We found that NCs stabilized with a TGL/DTG mixture show efficient and stable infrared photoluminescence centered in the second "biological window" (1050-1200 nm). Under optimized conditions, full width at half-maximum of the PL emission peak was from 70 to 100 nm. PbS NCs were stable to precipitation and aggregation for the time period from 2 to 3 months when stored in the dark under room temperature. Room-temperature photoluminescence quantum efficiency of NCs was from 7 to 10%. When NCs were stored at 37 degreesC, their PL emission red-shifted, consistent with the NC growth.