Chemistry Department, Faculty of Science, Menoufia University, Egypt.
Spectroscopy Department, Physics Division, National Research Center (NRC), Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 May 5;214:496-512. doi: 10.1016/j.saa.2019.02.042. Epub 2019 Feb 19.
Ficus retusa was used as reducing and stabilizing agent in the green synthesis of silver and gold nanoparticles with high dispersion stability and controllable size and shape. The controlling of reaction conditions i.e. contact time, extract quantity, metal concentration, and pH value enables the tuning of the particle size and size distribution of the metal nanoparticles. UV-visible spectroscopy was used to follow the spectral profile changes of the surface plasmon resonance of the metal nanoparticles due to different treatments. The surface plasmon resonance varies between 400 and 432 nm and between 522 and 554 nm for silver and gold nanoparticles, respectively, depending on the different reaction parameters. Atomic force and transmission electron microscopy results confirmed the success of preparation of spherical silver (15 nm) and gold (10-25 nm) nanoparticles with narrow size-distribution. Fourier transform infrared spectroscopy suggested the phenolic compounds play the key role in the reduction and stabilizing of metal ions. The colorimetric sensitivity of silver and gold nanoparticles to detect the presence of heavy metals in water was studied.
印度榕被用作还原剂和稳定剂，用于绿色合成具有高分散稳定性和可控尺寸和形状的银和金纳米粒子。通过控制反应条件，例如接触时间、提取物用量、金属浓度和 pH 值，可以调整金属纳米粒子的粒径和粒径分布。紫外-可见光谱用于跟踪由于不同处理而导致的金属纳米粒子表面等离子体共振的光谱轮廓变化。银和金纳米粒子的表面等离子体共振分别在 400 和 432nm 之间以及在 522 和 554nm 之间变化，这取决于不同的反应参数。原子力和透射电子显微镜结果证实了成功制备了具有窄粒径分布的球形银（15nm）和金（10-25nm）纳米粒子。傅里叶变换红外光谱表明，酚类化合物在还原和稳定金属离子中起关键作用。研究了银和金纳米粒子对水中重金属存在的比色敏感性。
