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ZnO Nanoparticles Beaded Multiwalled Carbon Nanotubes

Y. Zhu, H.I. Elim, Y.L. Foo, S. Triparthy, W.T. Quek, W. Ji, J. Thong and C.H. Sow
National University of Singapore, SG

Keywords:
ZnO, nanoparticles, carbon nanotubes, nonlinear optics

Abstract:
In this work, we report a hybrid system of ZnO nanoparticles on MWNT scaffolds synthesized via a very simple and straightforward process. This involved the coating of pure Zn on as-grown aligned MWNT films, followed by oxidization by simply heating the coated sample in air. After cooling down, ZnO nanoparticles were found to form chain-like structures along the MWNTs, whilst the morphology of aligned MWNTs remained unaltered. By directly changing the Zn coating duration and thus coating thickness, the average ZnO particle size and interparticle distance could be readily controlled. Based on this ZnO/MWNTs hybrid system, an ultrafast nonlinear optical switching behavior was demonstrated. Furthermore, three-photon adsorption of ZnO nanoparticles was observed. Our results highlight opportunities for integrating CNTs with other functional oxide nanoparticles via a simple method, and exploring the collective properties of nanoparticles/CNTs hybrid materials.

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