Aqueous (co)polymer stabilisers for size-controlled 2-5 nm gold nanoparticle synthesis with tuneable catalytic activity
Aqueous (co)polymer stabilisers for size-controlled 2-5 nm gold nanoparticle synthesis with tuneable catalytic activity
复制标题
用于尺寸控制的 2-5 nm 金纳米粒子合成的水性（共）聚合物稳定剂，具有可调的催化活性
DOI：
10.1039/d2nj03257k
复制
发表时间：
2022
影响因子：
3.3
通讯作者：
Traynor D
中科院分区：
文献类型：
--
作者：
Traynor D
金纳米颗粒或胶体金（AuNP）是近年来研究的最重要和最成熟的亚微米无机结构形式之一。AuNP的物理和化学性质是由它们的配体表面化学和它们的大小决定的，这可以在它们的合成过程中被操纵和调整。在这项研究中，开发了水性线性和支链均聚物和（co）聚合物，并将其用作AuNP合成过程中的表面稳定剂。采用传统的自由基聚合技术，以甲基丙烯酸（MAA）和低聚（乙二醇）甲基丙烯酸甲醚（OEGMA）单体和十二烷巯基（DDT）作为链转移剂，将不同的AuNP表面结合亲和力的单元结合在一起，制备了一系列此类聚合物稳定剂。在制备的高分子稳定剂库存在的情况下，通过HAuCl4·3H2O还原合成AuNPs。研究发现，通过改变（co）聚合物的组成和结构，可以合成尺寸可控的金纳米颗粒，通过紫外可见光谱测定，制备的AuNPs范围为2.17±0.07 nm至4.83±0.04 nm。不同的（co）聚合物组成和结构也产生了不同的催化行为，使用NaBH4将4-硝基苯酚（4-NP）还原为4-氨基苯酚（4-AP），催化反应速率从1.0 s−1到45.3 s−1，诱导时间从0秒到2070秒不等，这取决于合成过程中使用的聚合物稳定剂。
Gold nanoparticles, or colloidal gold (AuNP), represent one of the most significant and established forms of sub-micron inorganic structures to be researched in recent years. AuNP physical and chemical properties are dictated by both their ligand surface chemistry and their size, which can be manipulated and tuned during their synthesis. In this study, aqueous linear and branched homo-polymers and (co)polymers are developed and used as surface stabilisers during AuNP synthesis. A library of such polymeric stabilisers were prepared using conventional free radical polymerisation techniques to incorporate units of varying AuNP surface binding affinity, using methacrylic acid (MAA) and oligo (ethylene glycol) methyl ether methacrylate (OEGMA) monomers and dodecane thiol (DDT) as the chain transfer agent. AuNPs were synthesised via HAuCl4·3H2O reduction in the presence of the prepared library of polymeric stabilisers. It was observed that variation of (co)polymer composition and architecture allowed for size-controlled gold nanoparticle synthesis, with AuNPs prepared ranging from 2.17 ± 0.07 nm to 4.83 ± 0.04 nm as determined by UV-vis spectroscopy. Varying (co)polymer composition and architecture also yielded variable catalytic behaviour in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) using NaBH4, with catalytic reaction rates ranging from 1.0 s−1 to 45.3 s−1 and induction times ranging from 0 seconds to 2070 seconds depending on the polymeric stabilisers employed during synthesis.