Materials 2011, 4(6), 1132-1143; doi:10.3390/ma4061132
Article

Optical Properties of ZnO Nanoparticles Capped with Polymers

Received: 14 May 2011; Accepted: 16 June 2011 / Published: 17 June 2011
(This article belongs to the Special Issue Luminescent Materials 2011)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Optical properties of ZnO nanoparticles capped with polymers were investigated. Polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP) were used as capping reagents. ZnO nanoparticles were synthesized by the sol-gel method. Fluorescence and absorption spectra were measured. When we varied the timing of the addition of the polymer to the ZnO nanoparticle solution, the optical properties were drastically changed. When PEG was added to the solution before the synthesis of ZnO nanoparticles, the fluorescence intensity increased. At the same time, the total particle size increased, which indicated that PEG molecules had capped the ZnO nanoparticles. The capping led to surface passivation, which increased fluorescence intensity. However, when PEG was added to the solution after the synthesis of ZnO nanoparticles, the fluorescence and particle size did not change. When PVP was added to the solution before the synthesis of ZnO nanoparticles, aggregation of nanoparticles occurred. When PVP was added to the solution after the synthesis of ZnO nanoparticles, fluorescence and particle size increased. This improvement of optical properties is advantageous to the practical usage of ZnO nanoparticles, such as bioimaging
Keywords: nanoparticle; fluorescence; capping; zinc oxide; polyethylene glycol; polyvinyl pyrrolidone
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MDPI and ACS Style

Tachikawa, S.; Noguchi, A.; Tsuge, T.; Hara, M.; Odawara, O.; Wada, H. Optical Properties of ZnO Nanoparticles Capped with Polymers. Materials 2011, 4, 1132-1143.

AMA Style

Tachikawa S, Noguchi A, Tsuge T, Hara M, Odawara O, Wada H. Optical Properties of ZnO Nanoparticles Capped with Polymers. Materials. 2011; 4(6):1132-1143.

Chicago/Turabian Style

Tachikawa, Shingo; Noguchi, Atsushi; Tsuge, Takeharu; Hara, Masahiko; Odawara, Osamu; Wada, Hiroyuki. 2011. "Optical Properties of ZnO Nanoparticles Capped with Polymers." Materials 4, no. 6: 1132-1143.

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