Chemical Defects in the Highly Fluorescent Conjugated Polymer Dots
Chemical Defects in the Highly Fluorescent Conjugated Polymer Dots
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DOI：
10.1021/la103063p
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发表时间：
2010-12-07
期刊：
影响因子：
3.9
通讯作者：
Kee, Tak W.
中科院分区：
文献类型：
--
作者：
Clafton, Scott N.;Beattie, David A.;Kee, Tak W.
我们提出了强有力的证据，共轭聚合物的氧化形成的共轭聚合物点（CPdots），使用傅里叶变换红外光谱和X射线光电子能谱。虽然最近的研究表明，折叠成一个紧凑的3D结构的聚合物链参与这些纳米粒子的形成，这些本质上疏水的纳米级颗粒规避在水中聚集的过程仍然没有得到很好的理解。Zeta电位结果表明，这些点在中性pH下具有带负电荷的表面，Zeta电位和表面电荷密度分别约为-40 mV和（1.39 - 1.70）x 10（-2）C/m（2）。此外，CPdot的定量元素分析表明，氧占这些纳米颗粒的7-13%。总体结果支持在形成CP点的亲水表面中存在化学缺陷。因此，带电表面有助于抑制CP点在水中的聚集，导致胶体稳定性。
We present strong evidence for the oxidation of conjugated polymers in the formation of conjugated polymer dots (CPdots) using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Although recent studies show that folding of the polymer chain into a compact 3D structure is involved in the formation of these nanoparticles, the process by which these intrinsically hydrophobic nanoscale particles circumvent aggregation in water is still not well understood. Zeta potential results show that these dots have a negatively charged surface at neutral pH, with a zeta potential and surface charge density of approximately -40 mV and (1.39 - 1.70) x 10(-2) C/m(2), respectively. In addition, quantitative elemental analysis of CPdots indicates that oxygen composes 7-13% of these nanoparticles. The overall results support the presence of chemical defects in forming a hydrophilic surface of CPdots. As a consequence, the charged surface contributes to inhibiting the aggregation of CPdots in water, leading to colloidal stability.