Nancy Parvathy, Jose Jiya, Joy Nithin, Valluvadasan Sivakumaran, Philip Reji, Antoine Rodolphe, Thomas Sabu, Kalarikkal Nandakumar
School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, India.
International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam 686560, India.
Nanomaterials (Basel). 2021 Mar 30;11(4):880. doi: 10.3390/nano11040880.
The demand for metallic nanoparticle ornamented nanohybrid materials of graphene oxide (GO) finds copious recognition by virtue of its advanced high-tech applications. Far apart from the long-established synthesis protocols, a novel laser-induced generation of silver nanoparticles (Ag NPs) that are anchored onto the GO layers by a single-step green method named pulsed laser ablation has been exemplified in this work. The second and third harmonic wavelengths (532 nm and 355 nm) of an Nd:YAG pulsed laser is used for the production of Ag NPs from a bulk solid silver target ablated in an aqueous solution of GO to fabricate colloidal Ag-GO nanohybrid materials. UV-Vis absorption spectroscopy, Raman spectroscopy, and TEM validate the optical, structural, and morphological features of the hybrid nanomaterials. The results revealed that the laser-assisted in-situ deposition of Ag NPs on the few-layered GO surface improved its antibacterial properties, in which the hybrid nanostructure synthesized at a longer wavelength exhibited higher antibacterial action resistance to () than () bacteria. Moreover, nonlinear optical absorption (NLA) of Ag-GO nanohybrid was measured using the open aperture Z-scan technique. The Z-scan results signify the NLA properties of the Ag-GO hybrid material and have a large decline in transmittance of more than 60%, which can be employed as a promising optical limiting (OL) material.
由于其先进的高科技应用，对金属纳米颗粒修饰的氧化石墨烯（GO）纳米杂化材料的需求得到了广泛认可。与长期以来的合成方案不同，本工作展示了一种新颖的激光诱导生成银纳米颗粒（Ag NPs）的方法，即通过一种名为脉冲激光烧蚀的单步绿色方法将其锚定在GO层上。使用Nd:YAG脉冲激光的二次和三次谐波波长（532 nm和355 nm）从在GO水溶液中烧蚀的块状固态银靶材制备Ag NPs，以制造胶体Ag-GO纳米杂化材料。紫外可见吸收光谱、拉曼光谱和透射电子显微镜验证了杂化纳米材料的光学、结构和形态特征。结果表明，Ag NPs在少层GO表面的激光辅助原位沉积提高了其抗菌性能，其中在较长波长下合成的杂化纳米结构对（）细菌表现出比（）细菌更高的抗菌作用抗性。此外，使用开孔Z扫描技术测量了Ag-GO纳米杂化材料的非线性光学吸收（NLA）。Z扫描结果表明了Ag-GO杂化材料的NLA特性，其透过率大幅下降超过60%，可作为一种有前景的光学限幅（OL）材料。
