Amrute Vaishali, Supin K K, Vasundhara M, Chanda Anupama
Department of Physics, Dr. Harisingh Gour Vishwavidyalaya (A Central University) Sagar M.P. 470003 India
Polymers and Functional Materials Department, CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
RSC Adv. 2024 Oct 17;14(45):32786-32801. doi: 10.1039/d4ra05197a.
Nanotechnology is the platform with the greatest promise for scientific advancements. One of the advancement is improvement in photocatalytic and antibacterial performance. This work was undertaken to synthesize un-doped and silver (Ag) doped zinc oxide (ZnO) nanoparticles (NPs) using an inexpensive wet chemical method and to investigate the structural and optical properties, photocatalytic and antibacterial activity. The structural analysis from X-ray diffraction (XRD) pattern of un-doped and Ag-doped ZnO NPs displayed hexagonal wurtzite crystal structure and shifting in the peak position confirms the incorporation of Ag in ZnO lattice. Morphological study done by scanning electron microscope reveals spherical shaped NPs and an increase in grain size with Ag doping, the HRTEM images showed the nanocrystalline nature of particle. The Raman spectra showed variation in vibrational characteristics of the nanoparticles with Ag doping. The functional groups were analyzed using Fourier transform-infrared spectroscopy (FTIR). The optical properties were investigated by UV-visible and photoluminescence (PL) spectroscopic techniques. The Ag-doped ZnO NPs have a notably lower band gap than that of un-doped ZnO NPs, from 3.04 eV to 2.81 eV as studied by UV-visible spectra. The PL study showed decrease in intensity at near band edge emission with increase in Ag doping concentration indicating reduction in the free charge carrier recombination. These variations in the properties play major role in the enhancement of photocatalytic and antibacterial activity with increase in Ag doping concentration as compared to un-doped zinc oxide nanoparticles. The photo degradation efficiency of 99.12 ± 1% against Methylene Blue dye was achieved in the shortest period of 45 minutes ever reported when irradiated under the solar light and efficiency of 97.33 ± 1% was achieved in 15 min under Xenon Short Arc lamp. The antibacterial study was conducted using the Agar well diffusion method where the diameter of the zone of inhibition (ZOI) was increased from 14 mm to 20 mm and 13 mm to 18 mm against the bacteria and respectively, rendering this material suitable for photocatalytic degradation and antibacterial applications.
纳米技术是最具科学进步潜力的平台。其中一项进步是光催化和抗菌性能的提高。这项工作旨在采用一种廉价的湿化学方法合成未掺杂和银（Ag）掺杂的氧化锌（ZnO）纳米颗粒（NPs），并研究其结构和光学性质、光催化和抗菌活性。未掺杂和Ag掺杂的ZnO NPs的X射线衍射（XRD）图谱的结构分析显示为六方纤锌矿晶体结构，峰位的移动证实了Ag掺入ZnO晶格中。扫描电子显微镜进行的形态学研究揭示了球形的NPs以及随着Ag掺杂晶粒尺寸的增加，高分辨率透射电子显微镜（HRTEM）图像显示了颗粒的纳米晶性质。拉曼光谱显示随着Ag掺杂，纳米颗粒的振动特性发生变化。使用傅里叶变换红外光谱（FTIR）分析官能团。通过紫外可见和光致发光（PL）光谱技术研究光学性质。通过紫外可见光谱研究，Ag掺杂的ZnO NPs的带隙明显低于未掺杂的ZnO NPs，从3.04 eV降至2.81 eV。PL研究表明，随着Ag掺杂浓度的增加，近带边发射强度降低，表明自由电荷载流子复合减少。与未掺杂的氧化锌纳米颗粒相比，这些性质的变化在随着Ag掺杂浓度增加而增强光催化和抗菌活性方面起主要作用。在太阳光照射下，对亚甲基蓝染料的光降解效率在有史以来最短的45分钟内达到99.12±1%，在氙短弧灯下15分钟内达到97.33±1%。使用琼脂扩散法进行抗菌研究，其中对细菌的抑菌圈（ZOI）直径分别从14 mm增加到了20 mm和从13 mm增加到了18 mm，使得这种材料适用于光催化降解和抗菌应用。
