Large-Scale Cubic InN Nanocrystals by a Combined Solution- and Vapor-Phase Method under Silica Confinement
Large-Scale Cubic InN Nanocrystals by a Combined Solution- and Vapor-Phase Method under Silica Confinement
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在二氧化硅约束下采用溶液相和气相相结合的方法制备大尺寸立方 InN 纳米晶体
DOI：
10.1021/ja209072v
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发表时间：
2012-01-18
影响因子：
15
通讯作者：
Xu, Xingyan
中科院分区：
文献类型：
--
作者：
Chen, Zhuo;Li, Yanan;Xu, Xingyan
在二氧化硅约束下，采用液相和气相相相结合的方法合成了大尺寸的立方InN纳米晶体。在去除硅壳后，得到了具有均匀球形的近单分散的立方InN纳米晶在各种有机溶剂中稳定分散。InN纳米晶体的平均尺寸为5.7 +/- 0.6 nm。粉末x射线衍射结果表明，所制备的InN纳米晶体结晶度高，为立方相。x射线光电子能谱和能量色散能谱证实纳米晶体由In和N元素组成。该纳米晶体在室温下表现出红外光致发光，峰值能量约为0.62 eV，小于优质纤锌矿的峰值能量（约为0.65-0.7 eV），与理论计算相符。与其他低成本的溶液或蒸汽方法相比，InN纳米晶体的发射峰值能量小，表明我们的样品具有优异的晶体质量，缺陷密度低或可以忽略不计。这项工作将极大地促进基于铟的红外光电器件和生物领域的应用。
Large-scale cubic InN nanocrystals were synthesized by a combined solution- and vapor-phase method under silica confinement. Nearly monodisperse cubic InN nanocrystals with uniform spherical shape were dispersed stably in various organic solvents after removal of the silica shells. The average size of InN nanocrystals is 5.7 +/- 0.6 nm. Powder X-ray diffraction results indicate that the InN nanocrystals are of high crystallinity with a cubic phase. X-ray photoelectron spectroscopy and energy-dispersive spectroscopy confirm that the nanocrystals are composed of In and N elements. The InN nanocrystals exhibit infrared photoluminescence at room temperature, with a peak energy of similar to 0.62 eV, which is smaller than that of high-quality wurtzite InN (similar to 0.65-0.7 eV) and is in agreement with theoretical calculations. The small emission peak energy of InN nanocrystals, as compared to other low-cost solution or vapor methods, reveals the superior crystalline quality of our samples, with low or negligible defect density. This work will significantly promote InN-based applications in IR optoelectronic device and biology.