The Key Laboratory of Synthetic and Biological Colloids (Ministry of Education), School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
Molecules. 2023 Jun 23;28(13):4934. doi: 10.3390/molecules28134934.
Au nanoparticles were synthesized in a soft template of pseudo-polyanions composed of polyvinylpyrrolidone (PVP) and sodium dodecyl sulfate (SDS) by the in situ reduction of chloroauric acid (HAuCl) with PVP. The particle sizes and morphologies of the Au nanoparticles were regulated with concentrations of PVP or SDS at room temperature. Distinguished from the Au nanoparticles with various shapes, Au nanoflowers (AuNFs) with rich protrusion on the surface were obtained at the low final concentration of SDS and PVP. The typical AuNF synthesized in the PVP (50 g·L)-SDS (5 mmol·L)-HAuCl (0.25 mmol·L) solution exhibited a face-centered cubic structure dominated by a {111} crystal plane with an average equivalent particle size of 197 nm and an average protrusion height of 19 nm. Au nanoparticles with four different shapes, nanodendritic, nanoflower, 2D nanoflower, and nanoplate, were synthesized and used to modify the bare glassy carbon electrode (GCE) to obtain Au/GCEs, which were assigned as AuND/GCE, AuNF/GCE, 2D-AuNF/GCE, and AuNP/GCE, respectively. Electrochemical sensing platforms for nitrite detection were constructed by these Au/GCEs, which presented different detection sensitivity for nitrites. The results of cyclic voltammetry (CV) demonstrated that the AuNF/GCE exhibited the best detection sensitivity for nitrites, and the surface area of the AuNF/GCE was 1.838 times of the bare GCE, providing a linear (NO) detection range of 0.01-5.00 µmol·L with a limit of detection of 0.01 µmol·L. In addition, the AuNF/GCE exhibited good reproducibility, stability, and high anti-interference, providing potential for application in electrochemical sensing platforms.
金纳米粒子是通过氯金酸（HAuCl）与聚乙烯吡咯烷酮（PVP）原位还原在由聚乙烯吡咯烷酮（PVP）和十二烷基硫酸钠（SDS）组成的拟聚阴离子软模板中合成的。在室温下，通过改变 PVP 或 SDS 的浓度来调节金纳米粒子的粒径和形态。与具有各种形状的金纳米粒子不同，在 SDS 和 PVP 的最终浓度较低的情况下，得到了具有丰富表面突起的金纳米花（AuNFs）。在 PVP（50g·L）-SDS（5mmol·L）-HAuCl（0.25mmol·L）溶液中合成的典型 AuNF 具有面心立方结构，主要由{111}晶面组成，平均等效粒径为 197nm，平均突起高度为 19nm。合成了具有四种不同形状的金纳米粒子，纳米树枝状、纳米花状、二维纳米花状和纳米板状，并将其用于修饰裸玻碳电极（GCE），得到 Au/GCE，分别命名为 AuND/GCE、AuNF/GCE、2D-AuNF/GCE 和 AuNP/GCE。通过这些 Au/GCE 构建了用于检测亚硝酸盐的电化学传感平台，它们对亚硝酸盐表现出不同的检测灵敏度。循环伏安法（CV）的结果表明，AuNF/GCE 对亚硝酸盐具有最佳的检测灵敏度，并且 AuNF/GCE 的表面积是裸 GCE 的 1.838 倍，提供了 0.01-5.00μmol·L 的线性（NO）检测范围，检测限为 0.01μmol·L。此外，AuNF/GCE 表现出良好的重现性、稳定性和高抗干扰性，为在电化学传感平台中的应用提供了潜力。
