Dzimitrowicz Anna, Jamroz Piotr, Greda Krzysztof, Nowak Piotr, Nyk Marcin, Pohl Pawel
Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Stanislawa Wyspianskiego 27, 50-370 Wroclaw, Poland.
J Nanopart Res. 2015;17(4):185. doi: 10.1007/s11051-015-2992-7. Epub 2015 Apr 17.
Gold nanoparticles (Au NPs) were prepared by direct current atmospheric pressure glow microdischarge (dc-μAPGD) generated between a miniature argon flow microjet and a flowing liquid cathode. The applied discharge system was operated in a continuous flow liquid mode. The influence of various stabilizers added to the solution of the liquid cathode, i.e., gelatin (GEL), polyvinylpyrrolidone (PVP), or polyvinyl alcohol (PVA), as well as the concentration of the Au precursor (chloroauric acid, HAuCl) in the solution on the production growth of Au NPs was investigated. Changes in the intensity of the localized surface plasmon resonance (LSPR) band in UV/Vis absorption spectra of solutions treated by dc-μAPGD and their color were observed. The position and the intensity of the LSPR band indicated that relatively small nanoparticles were formed in solutions containing GEL as a capping agent. In these conditions, the maximum of the absorption LSPR band was at 531, 534, and 535 nm, respectively, for 50, 100, and 200 mg L of Au. Additionally, scanning electron microscopy (SEM) and dynamic light scattering (DLS) were used to analyze the structure and the morphology of obtained Au NPs. The shape of Au NPs was spherical and uniform. Their mean size was ca. 27, 73, and 92 nm, while the polydispersity index was 0.296, 0.348, and 0.456 for Au present in the solution of the flowing liquid cathode at a concentration of 50, 100, and 200 mg L, respectively. The production rate of synthesized Au NPs depended on the precursor concentration with mean values of 2.9, 3.5, and 5.7 mg h, respectively.
金纳米颗粒（Au NPs）是通过在微型氩流微喷射器和流动液体阴极之间产生的直流大气压辉光微放电（dc-μAPGD）制备的。所应用的放电系统以连续流动液体模式运行。研究了添加到液体阴极溶液中的各种稳定剂，即明胶（GEL）、聚乙烯吡咯烷酮（PVP）或聚乙烯醇（PVA），以及溶液中Au前驱体（氯金酸，HAuCl）的浓度对Au NPs生成生长的影响。观察了经dc-μAPGD处理的溶液在紫外/可见吸收光谱中局域表面等离子体共振（LSPR）带的强度变化及其颜色。LSPR带的位置和强度表明，在含有GEL作为封端剂的溶液中形成了相对较小的纳米颗粒。在这些条件下，对于50、100和200 mg/L的Au，吸收LSPR带的最大值分别在531、534和535 nm处。此外，使用扫描电子显微镜（SEM）和动态光散射（DLS）分析所获得的Au NPs的结构和形态。Au NPs的形状为球形且均匀。它们的平均尺寸分别约为27、73和92 nm，而对于流动液体阴极溶液中浓度为50、100和200 mg/L的Au，多分散指数分别为0.296、0.348和0.456。合成Au NPs的产率取决于前驱体浓度，平均值分别为2.9、3.5和5.7 mg/h。
