Effect of hydrazine hydrate on the luminescence properties of MPA capped CdTe nanocrystals in hot injection method
Effect of hydrazine hydrate on the luminescence properties of MPA capped CdTe nanocrystals in hot injection method
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DOI：
10.1016/j.jlumin.2014.08.024
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发表时间：
2014-12
影响因子：
3.6
通讯作者：
N. Mobedi;M. Marandi;H. Z. Bidaki
中科院分区：
文献类型：
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作者：
N. Mobedi;M. Marandi;H. Z. Bidaki
在本研究中，在水溶液中生长了尺寸约为2.7-3.5 nm的MPA包覆的CdTe纳米晶体。该过程是通过NaHTe与MPA和CdCl 2溶液在高温下反应来实现的。合成以标准和修饰形式的两种不同状态进行。在改进的合成中，在注入前将水合肼材料加入MPA加CdCl 2溶液中。在生长的加热时间期间监测纳米晶体尺寸和PL量子产率的演变。结果表明，对于标准合成，生长速率缓慢。在超过10 h的加热时间内，获得了具有高PL量子产率的CdTe纳米晶。相比之下，对于改进的合成，生长速率相当高。在这种状态下，带边发射与PL量子产率约为26%，实现了MPA覆盖的CdTe纳米晶体在短短2小时的加热过程。
In this research MPA capped CdTe nanocrystals with sizes around 2.7–3.5 nm were grown in aqueous solution. The process was performed through the reaction of NaHTe with MPA and CdCl2solution in high temperature. The synthesis was carried out in two different states of standard and modified forms. In the modified synthesis, the hydrazine hydrate material was added to the MPA plus CdCl2solution before injection. The evolution of the nanocrystals size and PL quantum yield was monitored during the heating time for the growth. The results demonstrated that for the standard synthesis the growth rate was slow. The CdTe nanocrystals with high PL quantum yields were achieved in more than 10 h of heating. In contrast for the modified synthesis the growth rate was considerably higher. In this state a band edge emission with PL quantum yield of about 26% was achieved for the MPA capped CdTe nanocrystals in just 2 h of the heating process.