Jia Yanling, Zhang Ke
College of Advanced Materials Engineering, Jiaxing Nanhu University Jiaxing 314000 China.
Beijing Institute of Technology Beijing 100081 China
RSC Adv. 2025 Mar 21;15(11):8764-8776. doi: 10.1039/d5ra00001g. eCollection 2025 Mar 17.
Herein, we present a facile one-step approach for synthesizing Ag/reduced graphene oxide (Ag-rGO) through synchronous reduction and coagulation of graphene oxide (GO) and silver nitrate (AgNO) under a nitrogen atmosphere. In this process, GO serves as the carrier and template, AgNO as the precursor, and rutin functions both as the reducing and stabilizing agent. The Ag-rGO nanocomposite is synthesized using an eco-friendly method, where spherical silver nanoparticles are randomly dispersed on the surface of reduced graphene oxide (rGO). This nanocomposite exhibits excellent catalytic activity for degrading methylene blue (MB) and demonstrates good surface-enhanced Raman scattering (SERS) activity as a SERS substrate. It was found that 3 mg Ag-rGO attained a decolorization rate of 96% within merely 9 minutes, with a corresponding reaction rate constant () of 0.362 min. SERS detection of R6G also exhibited good performance in terms of detection limits in the order of 10 M, an enhancement factor of 3.03 × 10, and high reproducibility (the maximum intensity deviation < 7.01%). The excellent performance can be attributed to the decreased size of Ag on the nanocomposite and the larger specific surface area achieved through the synchronous reduction and coagulation method. Additionally, the enrichment effect and superior electron transfer efficiency further enhance the catalytic performance of the nanocomposite, and the synergistic effect of chemical enhancement and electromagnetic enhancement contribute to the good Raman enhancement effect. The effects of reaction parameters such as time and varying reactant ratios on the catalytic and SERS activities of the nanocomposite were also investigated. These findings indicate the potential ability of the Ag-rGO for practical environmental monitoring and treatment applications.
在此，我们展示了一种简便的一步法，在氮气气氛下通过氧化石墨烯（GO）和硝酸银（AgNO₃）的同步还原和凝聚来合成银/还原氧化石墨烯（Ag-rGO）。在此过程中，GO作为载体和模板，AgNO₃作为前驱体，芦丁既作为还原剂又作为稳定剂。采用环保方法合成了Ag-rGO纳米复合材料，其中球形银纳米颗粒随机分散在还原氧化石墨烯（rGO）表面。该纳米复合材料对亚甲基蓝（MB）降解表现出优异的催化活性，并作为表面增强拉曼散射（SERS）基底展现出良好的SERS活性。研究发现，3mg Ag-rGO在仅9分钟内脱色率达到96%，相应的反应速率常数（k）为0.362 min⁻¹。对R6G的SERS检测在检测限约为10⁻⁸M、增强因子为3.03×10⁵以及高重现性（最大强度偏差<7.01%）方面也表现出良好性能。优异的性能可归因于纳米复合材料上Ag尺寸的减小以及通过同步还原和凝聚方法实现的更大比表面积。此外，富集效应和卓越的电子转移效率进一步提高了纳米复合材料的催化性能，化学增强和电磁增强的协同效应促成了良好的拉曼增强效果。还研究了时间和不同反应物比例等反应参数对纳米复合材料催化和SERS活性的影响。这些发现表明Ag-rGO在实际环境监测和处理应用中的潜在能力。
