Continuous Nucleation and Size Dependent Growth Kinetics of Indium Phosphide Nanocrystals
Continuous Nucleation and Size Dependent Growth Kinetics of Indium Phosphide Nanocrystals
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DOI：
10.1021/acs.chemmater.0c01561
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发表时间：
2020-05-26
影响因子：
8.6
通讯作者：
Owen, Jonathan S.
中科院分区：
文献类型：
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作者：
McMurtry, Brandon M.;Qan, Kevin;Owen, Jonathan S.
N，N‘-二取代乙二胺衍生的氨基膦(R-N(H)CH2CH2N(H)-R；R=邻甲苯基、苯基、苄基、异丙基和正辛基)被用来调节InP纳米晶形成动力学一个数量级以上。紫外-可见吸收和P-31核磁共振测量表明，纳米晶的形成速度受到前驱体反应性的限制。在低温(180摄氏度)下，晶体的成核与生长在整个反应过程中是同步进行的，而不是在早期以爆裂的形式发生。无论使用哪种前驱体，低温都会产生小尺寸的窄范围(d=4.2-4.9 nm)。更高的温度(高达270摄氏度)会促进生长到更大的尺寸(d
Aminophosphines derived from N,N'-disubstituted ethylenediamines (R-N(H)CH2CH2N(H)-R; R = ortho-tolyl, phenyl, benzyl, iso-propyl, and n-octyl) were used to adjust the kinetics of InP nanocrystal formation by more than 1 order of magnitude. Ultraviolet-visible absorption and P-31 nuclear magnetic resonance measurements demonstrate that the rate of nanocrystal formation is limited by the precursor reactivity. At low temperature (180 degrees C), crystal nucleation is concurrent with growth throughout the reaction, rather than occurring in a burst at early times. The low temperature produces a narrow range of small sizes (d = 4.2-4.9 nm) regardless of the precursor used. Higher temperatures (up to 270 degrees C) promote growth to larger sizes (d