Li Pengyang, Zhang Yahui, Huang Xia, Chen Junying, Chen Jiachang, Li Lei, Xi Xiaoqi
School of Chemical Engineering, Zhengzhou University, Zhengzhou, Henan450001, P.R. China.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan450001, P.R. China.
ACS Omega. 2023 Jan 10;8(3):3091-3101. doi: 10.1021/acsomega.2c06376. eCollection 2023 Jan 24.
Surface-enhanced Raman spectroscopy (SERS) is widely used in biological and chemical analyses and in other fields because of its advantages such as high sensitivity and nondestructive nature. Ancient bronze cultural relics of China are exquisitely shaped and highly ornamental. Harmful rust components on the surface of bronze cultural relics have been extensively analyzed. SERS is beneficial to the surface composition analysis of ancient Chinese bronze relics and can be used for accurate characterization with almost zero damage to the surface. In this study, we designed a solution with polyacrylonitrile (PAN) and polyvinylpyrrolidone (PVP) macromolecules as precursors, which were electrospun and used as the nanofiber substrate. After tannic acid modification, the substrate was loaded with silver nanoparticles by using Tollens' reagent as the silver source and glutaraldehyde as the reducing agent in a water bath. The morphology and size of silver nanoparticles were adjusted by changing the reaction times. The effects of tannic acid and PVP as stabilizers were investigated. R6G and basic copper chloride were used as probe molecules for substrate SERS, and the Raman enhancement factor was calculated. The SERS performance of the substrate with high sensitivity was verified through characterization.
表面增强拉曼光谱（SERS）因其具有高灵敏度和无损等优点，在生物和化学分析以及其他领域中得到广泛应用。中国古代青铜器文物造型精美、观赏性强。青铜文物表面的有害锈成分已得到广泛分析。SERS有利于对中国古代青铜文物的表面成分进行分析，并且几乎可以在对表面零损伤的情况下用于精确表征。在本研究中，我们设计了一种以聚丙烯腈（PAN）和聚乙烯吡咯烷酮（PVP）大分子为前驱体的溶液，将其进行静电纺丝并用作纳米纤维基底。经单宁酸改性后，以托伦试剂为银源、戊二醛为还原剂，在水浴中使基底负载银纳米颗粒。通过改变反应时间来调节银纳米颗粒的形貌和尺寸。研究了单宁酸和PVP作为稳定剂的作用。使用罗丹明6G（R6G）和碱式氯化铜作为基底SERS的探针分子，并计算拉曼增强因子。通过表征验证了该高灵敏度基底的SERS性能。
