Abstract
A one-step protocol for synthesizing Au@SiO2 yolk-shell nanoparticles (YSPs) from tetrachloroauric(III) acid (HAuCl4), tetramethyl orthosilicate (TMOS), and l-arginine in water is reported. Arginine, a basic amino acid, simultaneously reduces HAuCl4 to Au and catalyzes the reaction of TMOS to SiO2. The effects of HAuCl4, TMOS, and arginine on the morphology of YSPs are investigated. Time-course TEM analysis clarifies the formation process of the YSPs. The Au@SiO2 YSPs show good activity for the reduction of 4-nitrophenol.
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