Figure 5.

The preparation process and stabilization mechanism of the sample 4. I: the AuCl4- was reduced by sodium borohydride (NaBH4) and Au NPs modified by CTABr were quickly obtained; II: after standing for more than 5 months, the modified Au NPs could still exhibit ultrahigh stability due to the electrostatic repulsions and steric hindrances between different Au NPs.

Wang et al. Nanoscale Research Letters 2011 6:259   doi:10.1186/1556-276X-6-259
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