Faris Vinos Mushir, Barzinjy Azeez Abdullah, Hamad Samir Mustafa
Department of Nanotechnology, Scientific Research Center, Soran University, Erbil, Iraq.
Department of Physics, College of Education, Salahaddin University-Erbil, Erbil, Kurdistan , Iraq.
Recent Pat Nanotechnol. 2023;18(1):54-71. doi: 10.2174/1872210516666220826143110.
Metallic nanoparticles (NPs), in general, are able, due to the high surface area per unit volume, to absorb the maximum incoming light flux through the vicinity of plasmonic structures and then provide local heating. Thus, silver (Ag) NPs have been used to generate heat and increase the temperature of water from solar radiation energy. The optimal plasmonic heating generation can be obtained as soon as the wavelength of the light source is close to the plasmonic resonance wavelength of Ag NPs.
Ag NPs have been fabricated through a straightforward, cheap, as well as environmentally friendly approach. In this study, Salix babylonica L., weeping willow leaf extract has been utilized as a reducing, capping, and stabilizing agent, without using any other toxic materials. The importance of this study lies in the generation of hot electrons, which can be obtained by collecting the solar spectrum near the infrared and infrared regions, which cannot be obtained by conventional photocatalytic devices.
Numerous characterization techniques such as; UV-Vis, FT-IR spectroscopy, X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis were used to study the optical, chemical, structural, morphological, properties of the Ag NPs.
The impact of pH on the properties of Ag NPs and their performance to generate heat during solar irradiation have been investigated intensively. This study showed that the synthesized Ag NPs with pH value 12 is the optimum condition and can increase the temperature of water dramatically.
An evaluation of the current patents displays that the field of green synthesis Ag NPs utilizing plant extracts is a vital field and produces rather stable, safe and effective Ag NPs. The novelty of this patent is that Ag NPs can be synthesized from a one-pot reaction without using any exterior stabilizing and reducing agent, which is not conceivable by means of the existing processes. This study, also, is rare and distinctive, and it demonstrates that even a slight quantity of the Ag NPs is significantly raising the temperature of water effectively.
一般而言，金属纳米颗粒（NPs）由于单位体积具有高表面积，能够通过等离子体结构附近吸收最大入射光通量，进而产生局部加热。因此，银（Ag）纳米颗粒已被用于从太阳辐射能中产生热量并提高水温。一旦光源波长接近Ag纳米颗粒的等离子体共振波长，就能获得最佳的等离子体热生成。
通过一种直接、廉价且环保的方法制备了Ag纳米颗粒。在本研究中，垂柳叶提取物被用作还原剂、封端剂和稳定剂，未使用任何其他有毒材料。本研究的重要性在于产生热电子，这可以通过收集近红外和红外区域附近的太阳光谱来实现，而这是传统光催化装置无法做到的。
使用了多种表征技术，如紫外可见光谱、傅里叶变换红外光谱、X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和能量色散X射线（EDX）分析，以研究Ag纳米颗粒的光学、化学、结构、形态性质。
深入研究了pH值对Ag纳米颗粒性质及其在太阳辐射下产热性能的影响。该研究表明，pH值为12时合成的Ag纳米颗粒是最佳条件，能够显著提高水温。
对当前专利的评估表明，利用植物提取物绿色合成Ag纳米颗粒的领域是一个重要领域，并且能产生相当稳定、安全且有效的Ag纳米颗粒。该专利的新颖之处在于，Ag纳米颗粒可以通过一锅法反应合成，无需使用任何外部稳定剂和还原剂，这是现有工艺无法实现的。此外，本研究也很罕见且独特，它表明即使少量的Ag纳米颗粒也能有效地显著提高水温。
