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Materials 2017, 10(12), 1363; https://doi.org/10.3390/ma10121363

Study of Perfluorophosphonic Acid Surface Modifications on Zinc Oxide Nanoparticles

1
Department of Chemistry, Marshall University, Huntington, WV 25755, USA
2
Department of Chemical & Biomedical Engineering, West Virginia University, Morgantown, WV 26506, USA
3
Department of Chemistry, Pennsylvania State University, State College, PA 16802, USA
4
Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA
5
Chemistry Department, Washington and Jefferson College, Washington, PA 15391, USA
6
Department of Physics and Astronomy, West Virginia University, Morgantown, WV 25606, USA
7
Shared Research Facilities, West Virginia University, Morgantown, WV 25606, USA
*
Author to whom correspondence should be addressed.
Received: 27 October 2017 / Revised: 17 November 2017 / Accepted: 22 November 2017 / Published: 28 November 2017
(This article belongs to the Special Issue Zinc Oxide Nanostructures: Synthesis and Characterization)
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Abstract

In this study, perfluorinated phosphonic acid modifications were utilized to modify zinc oxide (ZnO) nanoparticles because they create a more stable surface due to the electronegativity of the perfluoro head group. Specifically, 12-pentafluorophenoxydodecylphosphonic acid, 2,3,4,5,6-pentafluorobenzylphosphonic acid, and (1H,1H,2H,2H-perfluorododecyl)phosphonic acid have been used to form thin films on the nanoparticle surfaces. The modified nanoparticles were then characterized using infrared spectroscopy, X-ray photoelectron spectroscopy, and solid-state nuclear magnetic resonance spectroscopy. Dynamic light scattering and scanning electron microscopy-energy dispersive X-ray spectroscopy were utilized to determine the particle size of the nanoparticles before and after modification, and to analyze the film coverage on the ZnO surfaces, respectively. Zeta potential measurements were obtained to determine the stability of the ZnO nanoparticles. It was shown that the surface charge increased as the alkyl chain length increases. This study shows that modifying the ZnO nanoparticles with perfluorinated groups increases the stability of the phosphonic acids adsorbed on the surfaces. Thermogravimetric analysis was used to distinguish between chemically and physically bound films on the modified nanoparticles. The higher weight loss for 12-pentafluorophenoxydodecylphosphonic acid and (1H,1H,2H,2H-perfluorododecyl)phosphonic acid modifications corresponds to a higher surface concentration of the modifications, and, ideally, higher surface coverage. While previous studies have shown how phosphonic acids interact with the surfaces of ZnO, the aim of this study was to understand how the perfluorinated groups can tune the surface properties of the nanoparticles. View Full-Text
Keywords: self-assembly films; zinc oxide; perfluorophosphonic acid; solid-state NMR; zeta potential self-assembly films; zinc oxide; perfluorophosphonic acid; solid-state NMR; zeta potential
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Quiñones, R.; Shoup, D.; Behnke, G.; Peck, C.; Agarwal, S.; Gupta, R.K.; Fagan, J.W.; Mueller, K.T.; Iuliucci, R.J.; Wang, Q. Study of Perfluorophosphonic Acid Surface Modifications on Zinc Oxide Nanoparticles. Materials 2017, 10, 1363.

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