Controlling the Lateral Size and Excitonic Properties of Colloidal PbS Nanosheets

Controlling the Lateral Size and Excitonic Properties of Colloidal PbS Nanosheets
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控制胶体 PbS 纳米片的横向尺寸和激子性质

DOI:
10.1002/cnma.201900656
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发表时间:
2020
期刊:
影响因子:
3.8
通讯作者:
Sun, Liangfeng
Sun, Liangfeng
中科院分区:
材料科学4区
文献类型:
--
作者:
Premathilaka, Shashini M.;Tang, Yiteng;Jiang, Zhoufeng;MDS Weeraddana, Tharaka;Debnath Antu, Antara;Bischoff, Seth;Sun, Liangfeng

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在胶体PbS纳米片的合成中,通过改变前驱体铅硫摩尔比,可以在100 nm到1500 nm的范围内调节纳米片的横向尺寸,同时保持其厚度在2.4 nm左右。使用长碳链的氯代烷分子作为封端配体,可以进一步将横向尺寸减小到20 nm。反应溶液中氯代烷的浓度和反应温度对侧向尺寸也有显著影响。在室温下,横向尺寸较小的纳米薄片表现出较窄的发光线宽。同样的纳米片在光学吸收光谱的带边附近也显示出一个尖锐的激子峰。
By changing the precursor lead‐to‐sulfur molar ratio in the synthesis of colloidal PbS nanosheets, the lateral size of the nanosheet can be tuned in a wide range from 100 nm to 1500 nm while keeping its thickness around 2.4 nm. Using chloroalkane molecules with a long carbon‐chain as the capping ligands can further reduce the lateral size down to 20 nm. The concentration of the chloroalkane in the reaction solution and the reaction temperature also have significant effects on the lateral size. At room temperature, nanosheets with a small lateral size exhibit a narrow light‐emission linewidth. The same nanosheets also show a sharp exciton peak near the band edge in the optical absorption spectrum.
胶体 PbS 纳米片的生长及其光致发光的增强。
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发表时间: 2015
期刊: Physical chemistry chemical physics : PCCP
影响因子: --
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合成%20%20胶体%20PbS%20纳米片%20与%20接近%20100%%20成功%20率
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