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General Bottom-Up Construction of Spherical Particles by Pulsed Laser Irradiation of Colloidal Nanoparticles: A Case Study on CuO

Authors

  • Dr. Hongqiang Wang,

    Corresponding author
    1. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
    • Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Dr. Kenji Kawaguchi,

    1. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Dr. Alexander Pyatenko,

    1. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Dr. Xiangyou Li,

    1. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Dr. Zaneta Swiatkowska-Warkocka,

    1. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Yukiko Katou,

    1. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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  • Dr. Naoto Koshizaki

    Corresponding author
    1. Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
    • Nanosystem Research Institute (NRI), National Institute of Advanced Industrial, Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565 (Japan)
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Abstract

The development of a general method to fabricate spherical semiconductor and metal particles advances their promising electrical, optical, magnetic, plasmonic, thermoelectric, and optoelectric applications. Herein, by using CuO as an example, we systematically demonstrate a general bottom-up laser processing technique for the synthesis of submicrometer semiconductor and metal colloidal spheres, in which the unique selective pulsed heating assures the formation of spherical particles. Importantly, we can easily control the size and phase of resultant colloidal spheres by simply tuning the input laser fluence. The heating–melting–fusion mechanism is proposed to be responsible for the size evolution of the spherical particles. We have systematically investigated the influence of experimental parameters, including laser fluence, laser wavelength, laser irradiation time, dispersing liquid, and starting material concentration on the formation of colloidal spheres. We believe that this facile laser irradiation approach represents a major step not only for the fabrication of colloidal spheres but also in the practical application of laser processing for micro- and nanomaterial synthesis.

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