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中文摘要：
采用蒸汽冷凝法制备了10～100nm的铜纳米颗粒，然后将纳米铜分散在水溶液中，通过重力沉降法得到一系列不同尺度的铜纳米颗粒溶液．用光栅光谱仪检测其透射光谱，并进行分析处理．结果表明，不同尺寸的纳米铜颗粒均有2个吸收峰，峰值波长分别在450nm和610nm左右，并且随着铜纳米颗粒尺度的减小，吸收峰向短波长移动．纳米铜颗粒的光吸收谱中出现的双峰结构，我们认为来自于其特有的表面等离激元吸收峰．
英文摘要：
A series of Cu nanoparticles with different sizes were prepared by sedimentation method. Study on the transmission spectrum shows that the two peaks of the absorbance spectrum are at about 450 nm and 610 nm, and the peak values shift towards longer wavelength as the size of Cu nanoparticle increases. However, the phenomenon cannot be found in the absorbance spectrum of bulk materials.
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