Formation Mechanism of Carbogenic Nanoparticles with Dual Photoluminescence Emission
Formation Mechanism of Carbogenic Nanoparticles with Dual Photoluminescence Emission
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DOI：
10.1021/ja204661r
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发表时间：
2012-01-18
影响因子：
15
通讯作者：
Giannelis, Emmanuel P.
中科院分区：
文献类型：
--
作者：
Krysmann, Marta J.;Kelarakis, Antonios;Giannelis, Emmanuel P.
我们提出了一个系统的研究的碳纳米粒子（GNP），也被称为C点，通过以下的柠檬酸（CA）-乙醇胺（EA）前体在不同温度下的热解的形成机制。在180 ° C下热解导致CNP分子前体具有强烈的光致发光（PL）光谱和通过CA EA脱水形成的高量子产率。在较高的温度（230摄氏度）下，碳核开始形成，PL是由于分子荧光团和碳核的存在。在甚至更高的温度（分别为300和400摄氏度）下获得表现出主要或完全由产碳核产生的PL的CNP。由于分子荧光团在低热解温度下占主导地位，而碳核在较高温度下开始形成，因此CNP的PL行为强烈依赖于用于其合成的条件。
We present a systematic investigation of the formation mechanism of carbogenic nanoparticles (GNPs), otherwise referred to as C-dots, by following the pyrolysis of citric acid (CA)-ethanolamine (EA) precursor at different temperatures. Pyrolysis at 180 degrees C leads to a CNP molecular precursor with a strongly intense photoluminescence (PL) spectrum and high quantum yield formed by dehydration of CA EA. At higher temperatures (230 degrees C) a carbogenic core starts forming and the PL is due to the presence of both molecular fluorophores and the carbogenic core. CNPs that exhibit mostly or exclusively PL arising from carbogenic cores are obtained at even higher temperatures (300 and 400 degrees C, respectively). Since the molecular fluorophores predominate at low pyrolysis temperatures while the carbogenic core starts forming at higher temperatures, the PL behavior of CNPs strongly depends on the conditions used for their synthesis.