高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (4): 667-675.doi: 10.7503/cjcu20180435

• 无机化学 • 上一篇    下一篇

三明治结构纳米银/氧化石墨烯基底的制备及SERS性能

王稳1,2, 陶霞芳2, 吴赟炎2, 赵南2, 程晓农2, 杨娟2, 周亚洲2()   

  1. 1. 苏州健雄职业技术学院, 太仓 215411
    2. 江苏大学材料科学与工程学院, 镇江 212013
  • 收稿日期:2018-06-13 出版日期:2019-04-03 发布日期:2018-11-19
  • 作者简介:

    联系人简介: 周亚洲, 男, 博士, 副教授, 主要从事纳米功能材料方面的研究. E-mail: yazhou@ujs.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 51702129, 51572114)、 江苏省教育厅自然科学基金面上项目(批准号: 16KJB40009)、 江苏省高等职业院校教师专业带头人高端研修计划(批准号: 2017GRGDYX019)和江苏高校“青蓝工程”项目(苏教师[2017]15号)资助.

Fabrication and SERS Performance of “Sandwich” Structured Silver Nanoparticles/Graphene Oxide Substrates

WANG Wen1,2, TAO Xiafang2, WU Yunyan2, ZHAO Nan2, CHENG Xiaonong2, YANG Juan2, ZHOU Yazhou2,*()   

  1. 1. Chien-shiung Institute of Technology, Taicang 215411, China
    2. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2018-06-13 Online:2019-04-03 Published:2018-11-19
  • Contact: ZHOU Yazhou E-mail:yazhou@ujs.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.51702129, 51572114), the Natural Science Foundation of Education Department of Jiangsu Province, China(No.16KJB40009), the Domestic Senior Visiting Scholars Program of Higher Vacational Colleges of Jiangsu Province, China(No.2017GRGDYX019) and “Qing Lan” Project of Jiangsu Province, China.

摘要:

采用易操作且低成本的静电自组装方法, 在质子化的玻璃基片上, 通过交替沉积氧化石墨烯(GO) 和带正电荷的银纳米粒子(AgNPs) 获得少数层GO和AgNPs复合薄膜(AgNPs/GO). 采用紫外-可见光吸收光谱、 原子力显微镜和扫描电子显微镜对复合薄膜的生长和表面形貌进行了表征. 结果表明, 通过调控AgNPs 溶胶浓度和自组装循环次数, 可以获得AgNPs/GO/AgNPs 的三明治结构, 并在基底表面形成均匀的AgNPs 聚集体. 表面增强拉曼散射(SERS)研究结果表明, AgNPs/GO-4基底具有最佳的SERS性能, 其对罗丹明6G(R6G) 和结晶紫的平均拉曼增强因子分别为3.4×108和1.3×109, 对R6G的最低检测浓度约为10-12 mol/L. 多层三明治结构和较小颗粒间距使得AgNPs层之间产生强烈的耦合作用, 并在GO片层间产生大量的“热点”, 显著提高SERS性能, 而少数层GO具有强吸附性, 有利于分子在基底中富集, 从而起到化学增强作用, 提高SERS灵敏度.

关键词: 氧化石墨烯, 银纳米粒子, 三明治结构, 静电自组装, 表面增强拉曼散射

Abstract:

Silver nanoparticles/graphene oxide(AgNPs/GO) films with few-layer GO were prepared through alternating deposition of GO sheets and positively charged AgNPs via electrostatic self-assembly approach. The formation and surface morphology of prepared substrates were characterized by UV-Vis spectra, AFM and SEM. The results show that the AgNPs/GO substrates with “Sandwich” structure and AgNPs aggregates can be obtained by the control of concentration of AgNPs colloid and self-assembly cycles. The SERS performances show that the AgNPs/GO-4 substrate has the optimal SERS activity. The average analytical enhancement factors(AEFs) of this substrate towards Rhodamine 6G and crystal violet are 3.4×108 and 1.3×109, respectively, and the minimum detectable concentration of R6G is 10-12 mol/L. Due to the “Sandwich” structure and strong coupling effect of narrow interparticle distance, abundant “hot spots” can be generated in GO sheets, resulting in improved SERS activity. Furthermore, the strong adsorption ability of few-layer GO is beneficial for enrichment of molecules in substrate, providing the chemical enhancement effect and improving the SERS sensitivity.

Key words: Graphene oxide, Silver nanoparticles, Sandwich structure, Electrostatic self-assembly, Surface-enhanced Raman scattering

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