In this work, a new capping agent, cinnamic acid (CA) was used to synthesize Au nanoparticles (NPs) under ambient conditions. The size of the NPs can be controlled by adjusting the concentration of reductant (in our experiment sodium borohydride was used) or CA. The CA-stabilized Au NPs can self-assemble into ‘nanowire-like’ or ‘pearl-necklace-like’ nanostructures by adjusting the molar ratio of CA to HAuCl 4 or by tuning the pH value of the Au colloidal solution. The process of Au NPs self-assembly was investigated by UV–vis spectroscopy and transmission electron microscopy. The results reveal that the induced dipole–dipole interaction is the driving force of Au NP linear assemblies.
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Wang et al. (2006) studied this question.
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