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Spherical aggregates composed of gold nanoparticles

机译：由金纳米颗粒组成的球形聚集体

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Alkylated triethylenetetramine (C12E3) was synthesized and used as both a reductant in the preparation of gold nanoparticles by the reduction of HAuCl4 and a stabilizer in the subsequent self-assembly of the gold nanoparticles. In acidic aqueous solution, spherical aggregates (with a diameter of about 202 +/- 22 nm) of gold nanoparticles (with the mean diameter of similar to 18.7 nm) were formed. The anion-induced ammonium adsorption of the alkylated amines on the gold nanoparticles was considered to provide the electrostatic repulsion and steric hindrance between the gold nanoparticles, which constituted the barrier that prevented the individual particles from coagulating. However, as the amino groups became deprotonated with increasing pH, the ammonium adsorption was weakened, and the amino groups were desorbed from the gold surface, resulting in discrete gold particles. The results indicate that the morphology of the reduced gold nanoparticles is controllable through pH-'tunable' aggregation under the mediation of the amino groups of alkylated amine to create spherical microstructures.
机译：合成了烷基化的三亚乙基四胺（C12E3），并通过还原HAuCl4将其用作金纳米颗粒制备中的还原剂和金纳米颗粒随后的自组装过程中的稳定剂。在酸性水溶液中，形成了金纳米颗粒（平均直径类似于18.7 nm）的球形聚集体（直径约为202 +/- 22 nm）。阴离子诱导的烷基化胺在金纳米颗粒上的铵吸附被认为在金纳米颗粒之间提供了静电排斥和空间位阻，这构成了防止单个颗粒凝结的屏障。但是，随着pH升高使氨基去质子化，铵的吸附作用减弱，氨基从金表面解吸，形成离散的金颗粒。结果表明，还原的金纳米颗粒的形态可通过在烷基化胺的氨基介导下形成球形微结构的pH“可调”聚集来控制。

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