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High catalytic performance of raspberry-like gold nanoparticles and enhancement of stability by silica coating

机译：覆盆子状金纳米粒子的高催化性能和二氧化硅涂层提高了稳定性

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摘要

WRaspberry-like gold nanoparticles (Au RLNPs) synthesized through reduction of HAuCl4 by using Brij35 surfactant and NaOH show high catalytic activity in the reduction of 4-nitrophenol and ethanol electrooxidation. The enhanced catalytic activity of Au RLNPs is mainly due to their high surface roughness. However, Au RLNPs are easily changed to spherical or aggregated nanoparticles by treatment with acids, thiols, and cationic surfactants (e.g., CTAB), making it difficult to sustain the catalytic activity. To improve the stability and applicability in a wide range of environments without degrading the original Au RLNP morphology, silica-coated Au RLNPs (Au RLNP@SiO2 NPs) were successfully synthesized through a sol-gel process using poly(vinylpyrrolidone) (PVP) as a primer. In comparison with Au RLNPs and other Au nanoparticles, Au RLNP@SiO2 NPs are more easily recovered and recycled in repeated catalytic reactions.
机译：通过使用Brij35表面活性剂和NaOH还原HAuCl4合成的类草莓状金纳米颗粒（Au RLNPs）在还原4-硝基苯酚和乙醇电氧化反应中显示出高催化活性。 Au RLNPs增强的催化活性主要是由于它们的高表面粗糙度。但是，通过用酸，硫醇和阳离子表面活性剂（例如，CTAB）处理，Au RLNP容易地变成球形或聚集的纳米颗粒，从而难以维持催化活性。为了在不破坏原始Au RLNP形态的情况下提高其在各种环境中的稳定性和适用性，使用聚（乙烯基吡咯烷酮）（PVP）作为溶胶-凝胶法成功地合成了二氧化硅包覆的Au RLNP（Au RLNP @ SiO2 NPs）。底漆。与Au RLNPs和其他Au纳米颗粒相比，Au RLNP @ SiO2 NPs在重复的催化反应中更容易回收和再循环。

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