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Citrate-capped gold nanoparticles with different colours and diameters were prepared by the reduction of HAuCl 4 using sodium citrate. With increasing the size of gold particles, the plasmon absorption peaks were shifted to longer wavelength and the intensity of resonance light scattering was enhanced. The resonance light scattering of gold nanoparticles in the range of 500–600nm was quenched...
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