Size influence on optical absorption property of ultra-fine nickel hollow spheres
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Nickel hollow spheres (NHSs) with different diameter have been synthesized by the autocatalytic reduction method. The morphology, particle size distribution and optical absorption property of NHSs were investigated. The optical absorption intensity obviously increases in ultraviolet—near infrared region with the decrease of particle size. While in infrared region, nickel hollow spheres have almost no absorption. After the heat treatment process, the grain sizes of samples become bigger and the absorptances decrease in UV–Vis–NIR region. For smaller particles, the absorption peak in ultraviolet range moves from 375 to 440 nm because of the increase of grain size after heat treatment.
KeywordsHollow Sphere Heat Treatment Process Nickel Sulfate Photon Correlation Spectroscopy Hollow Particle
This work is supported by National Natural Science Foundation of China (Grant no. 50474004), Shanghai Science and Technology committee Nano Special Fund (Grant no. 0552nm004), the “Dawn” Program of Shanghai Education Commission and the New-Century Training Program Foundation for Talents from the Ministry of Education of China.