Continuous Transition from 3D to 1D Confinement Observed during the Formation of CdSe Nanoplatelets
Continuous Transition from 3D to 1D Confinement Observed during the Formation of CdSe Nanoplatelets
复制标题
DOI：
10.1021/ja110046d
复制
发表时间：
2011-03-09
影响因子：
15
通讯作者：
Dubertret, B.
中科院分区：
文献类型：
--
作者：
Ithurria, S.;Bousquet, G.;Dubertret, B.
我们用透射电子显微镜和光谱分析研究了胶体CdSe纳米小片的形成。我们发现，小的(~lt；2 nm)纳米晶CdSe种子的连续横向伸展形成了小片。纳米颗粒的厚度由种子尺寸固定，并且在颗粒形成过程中保持恒定。纳米血小板的横向尺寸可以通过额外的前体注射进行调节。吸收和荧光分析，当他们连续横向延伸时，证实了从三维受限纳米粒子到一维受限纳米粒子的连续转变。我们发现，对于我们控制的不同血小板厚度，镉硒血小板的形成相似，精确度为一层镉硒单层。
We study the formation of colloidal CdSe nanoplatelets using both tansmission electron microscopy (TEM) and spectroscopic analysis. We show that the platelets form by continuous lateral extension of small (< 2 nm) nanocrystal CdSe seeds. The nanoplatelet thickness is fixed by the seed dimension and remains constant during the platelet formation. The nano platelet lateral dimensions can be tuned using additional precursor injection. Absorption and fluorescence analysis of the CdSe nanoplatelets as they continuously extend laterally confirms a continuous transition from 3D to 1D confined nanoparticles. The formation of the CdSe platelets is found to be similar for different platelet thicknesses that we control with a precision of one CdSe monolayer.