Amini Abbas, Rahimi Marjan, Nazari Marziyeh, Cheng Chun, Samali Bijan
Centre for Infrastructure Engineering, Western Sydney University, Kingswood Campus Bld Z, Locked Bag 1797 Penrith NSW 2751 Australia
Department of Mechanical Engineering, Australian College of Kuwait Mishref 13015 Kuwait.
RSC Adv. 2019 Jan 21;9(5):2772-2783. doi: 10.1039/c8ra09029g. eCollection 2019 Jan 18.
Two heteropolytungstate structures, Keggin (HPWO) and Preyssler (H[NaPWO]), were used to synthesize conductive silver nanoparticle-polyaniline-heteropolytungstate (AgNPs-PAni-HPW) nanocomposites. During the oxidative polymerization of aniline, heteropolyblue was generated and served as the reducing agent to stabilize and distribute AgNPs within "PAni-Keggin" and "PAni-Preyssler" matrixes as well as on their surfaces. The prepared nanocomposites and AgNPs were characterized using UV-visible (UV-Vis) and Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), pore size distribution BET, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). UV-Vis results showed different stages of the formation of metal NPs embedded in the polymer-HPW composites, and FT-IR spectra presented characteristic bands of PAni, Keggin and Preyssler anions in the composites confirming no changes in their structures. The presence of AgNPs and an intensely crystalline matrix were confirmed by the XRD pattern. The BET surface areas were found to be 38.426 m g for "AgNPs-PAni-Keggin" and 29.977 m g for "AgNPs-PAni-Preyssler" nanocomposites with broad distributions of meso-porous structure for both nanocomposites. TEM and SEM images confirmed that the type of heteropolyacids affected the size of AgNPs. This is the first report that uses Keggin and Preyssler-type heteropolytungstate to synthesize "AgNPs-PAni-HPW" nanocomposites in an ambient condition through a low-cost, facile, one-pot, environmentally friendly and simultaneous oxidative polymerization protocol.
采用两种杂多钨酸盐结构，即Keggin型（HPWO）和Preyssler型（H[NaPWO]），合成了导电银纳米颗粒-聚苯胺-杂多钨酸盐（AgNPs-PAni-HPW）纳米复合材料。在苯胺的氧化聚合过程中，生成了杂多蓝，并作为还原剂将AgNPs稳定并分布在“PAni-Keggin”和“PAni-Preyssler”基质及其表面。使用紫外可见（UV-Vis）光谱、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、孔径分布BET、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对制备的纳米复合材料和AgNPs进行了表征。UV-Vis结果显示了嵌入聚合物-HPW复合材料中的金属纳米颗粒形成的不同阶段，FT-IR光谱呈现了复合材料中PAni、Keggin和Preyssler阴离子的特征峰，证实了它们的结构没有变化。XRD图谱证实了AgNPs的存在和高度结晶的基质。发现“AgNPs-PAni-Keggin”纳米复合材料的BET表面积为38.426 m²/g，“AgNPs-PAni-Preyssler”纳米复合材料的BET表面积为29.977 m²/g，两种纳米复合材料均具有介孔结构的宽分布。TEM和SEM图像证实了杂多酸的类型影响了AgNPs的尺寸。这是首次报道在环境条件下通过低成本、简便、一锅法、环境友好且同时进行的氧化聚合方案，使用Keggin型和Preyssler型杂多钨酸盐合成“AgNPs-PAni-HPW”纳米复合材料。
