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Type: Journal article
Title: Chemical defects in the highly fluorescent conjugated polymer dots
Author: Clafton, S.
Beattie, D.
Mierczynska-Vasilev, A.
Acres, R.
Morgan, A.
Kee, T.
Citation: Langmuir: the ACS journal of surfaces and colloids, 2010; 26(23):17785-17789
Publisher: Amer Chemical Soc
Issue Date: 2010
ISSN: 0743-7463
Statement of
Scott N. Clafton, David A. Beattie, Agnieszka Mierczynska-Vasilev, Robert G. Acres, Alan C. Morgan, and Tak W. Kee
Abstract: 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) × 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.
Keywords: Oxygen
Fluorescent Dyes
Microscopy, Atomic Force
Spectrometry, Fluorescence
Spectroscopy, Fourier Transform Infrared
Spectrophotometry, Ultraviolet
Spectrometry, X-Ray Emission
Particle Size
Hydrophobic and Hydrophilic Interactions
Rights: ©2010 American Chemical Society
DOI: 10.1021/la103063p
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