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General Bottom‐Up Construction of Spherical Particles by Pulsed Laser Irradiation of Colloidal Nanoparticles: A Case Study on CuO
Author(s) -
Wang Hongqiang,
Kawaguchi Kenji,
Pyatenko Alexander,
Li Xiangyou,
SwiatkowskaWarkocka Zaneta,
Katou Yukiko,
Koshizaki Naoto
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201102079
Subject(s) - materials science , fluence , laser , irradiation , spheres , nanoparticle , semiconductor , nanotechnology , nanomaterials , fabrication , colloid , optoelectronics , optics , chemical engineering , medicine , physics , alternative medicine , engineering , pathology , astronomy , nuclear physics
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.