研究报告
王旺阳,李晓玲,闫妍,杨海峰,李俊芳,刘海燕,袁珮.Au/Fe3O4/GO复合SERS基底的制备及对水溶液中低浓度芘的富集-检测[J].环境科学学报,2018,38(2):475-483
Au/Fe3O4/GO复合SERS基底的制备及对水溶液中低浓度芘的富集-检测
- Preparation of Au/Fe3O4/GO composite as SERS substrate and its application in the enrichment and detection for low-concentration pyrene
- 基金项目：国家质检公益性行业科研专项（No.201410015）
- 作者
- 单位
- 王旺阳
- 中国石油大学(北京), 化学工程学院, 北京 102249
- 李晓玲
- 福州大学, 石油化工学院, 福州 350116
- 闫妍
- 中国检验检疫科学研究院, 工业与消费品安全研究所, 北京 100123
- 杨海峰
- 中国检验检疫科学研究院, 工业与消费品安全研究所, 北京 100123
- 李俊芳
- 中国检验检疫科学研究院, 工业与消费品安全研究所, 北京 100123
- 刘海燕
- 中国石油大学(北京), 化学工程学院, 北京 102249
- 袁珮
- 福州大学, 石油化工学院, 福州 350116
- 摘要：以氧化石墨烯（GO）为载体，利用静电吸附将氨基修饰的Fe3O4磁性纳米颗粒负载到GO表面得到GO-Fe3O4复合材料，再通过静电作用将Au纳米颗粒与GO-Fe3O4复合材料组装，制备了Au/Fe3O4/GO复合材料，并考察其表面增强拉曼（SERS）活性.首先以罗丹明B（RhB）为探针分子，考察Au纳米颗粒的粒径对SERS性能的影响，发现平均粒径为40 nm的Au纳米颗粒具有最好的SERS效果.SERS检测性能随着Au负载量的提高而逐渐变优，Au/GO中Au负载量为20%时最优.以多环芳烃分子芘为探针分子，探究Au/Fe3O4/GO复合材料中各组分对SERS性能的影响发现，Au纳米颗粒对拉曼信号的增强起主要作用，GO可以通过化学增强效应及对芘的吸附富集作用有效提高SERS检出限，Fe3O4的存在可以使基底快速分离，简化实验步骤，便于基底重复利用.该方法对水溶液中芘的检出限达到10-8 mol·L-1，相对于普通拉曼的检出限有了明显的降低，有望被用于环境中痕量多环芳烃的富集-检测.
- Abstract：Au/Fe3O4/GO nanocomposites were successfully synthesized by assembling Au nanoparticles (NPs) with Fe3O4/GO which were obtained by loading amino-modified Fe3O4 NPs on graphene oxides, and the Au/Fe3O4/GO nanocomposites were used as a surface-enhanced Raman scattering (SERS) substrate to enrich and detect polycyclic aromatic hydrocarbons (PAHs). Firstly, rhodamine B (RhB) was used as a probe molecule to investigate the effect of Au NPs size on SERS performance and it was found that Au NPs with an average particle size of 40 nm had the best Raman enhancement effect. The SERS detection performance was improved with the increase of Au loadings and the optimal mass fraction of Au in GO/Au composites was 20%. Then, the effect of each component of Au/Fe3O4/GO nanocomposites on SERS was explored by using pyrene as a probe molecule. The results show that Au NPs played a major role in the enhancement of the Raman signal according to the electromagnetic enhancement mechanism and GO could not only enrich the PAHs through π-π interaction but also generate strong chemical enhancement to Raman signal. The existence of Fe3O4 was favor to the quick separation of substrate from the solutions, which greatly simplified the detection procedure and facilitated the cycle use of the substrate. The detection limit of pyrene was 10-8 mol·L-1 which is significantly lower than that of ordinary Raman, and it is expected to be used for the enrichment and detection of trace PAHs in the environment.
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