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Size-controlled synthesis of monodispersed gold nanoparticles via carbon monoxide gas reduction

机译:通过一氧化碳气体还原进行尺寸控制的单分散金纳米颗粒的合成

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摘要

An in depth analysis of gold nanoparticle (AuNP) synthesis and size tuning, utilizing carbon monoxide (CO) gas as a reducing agent, is presented for the first time. The sizes of the AuNPs are tunable from ~4 to 100 nm by altering the concentration of HAuCl4 and inlet CO gas-injection flow rate. It is also found that speciation of aqueous HAuCl4, prior to reduction, influences the size, morphology, and properties of AuNPs when reduced with CO gas. Ensemble extinction spectra and TEM images provide clear evidence that CO reduction offers a high level of monodispersity with standard deviations as low as 3%. Upon synthesis, no excess reducing agent remains in solution eliminating the need for purification. The time necessary to synthesize AuNPs, using CO, is less than 2 min.
机译:首次提出了利用一氧化碳(CO)气体作为还原剂的金纳米颗粒(AuNP)合成和尺寸调节的深度分析。通过改变HAuCl4的浓度和入口CO气体注入流速,AuNP的大小可在约4至100 nm范围内调节。还发现还原前,HAuCl4水溶液的形态会影响当用CO气体还原时AuNPs的尺寸,形态和性质。整体的消光光谱和TEM图像提供了明确的证据,表明CO的减少提供了高水平的单分散性,标准偏差低至3%。合成后,溶液中没有多余的还原剂,无需纯化。使用CO合成AuNP所需的时间少于2分钟。

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