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首页> 外文期刊>RSC Advances >In situ synthesis of low-cost and large-scale flexible metal nanoparticle–polymer composite films as highly sensitive SERS substrates for surface trace analysis
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In situ synthesis of low-cost and large-scale flexible metal nanoparticle–polymer composite films as highly sensitive SERS substrates for surface trace analysis

机译：原位合成低成本和大规模柔性金属纳米粒子 - 聚合物复合膜，如高敏感的SERS基材用于表面痕量分析

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Surface-enhanced Raman spectroscopy (SERS) has been one of the most promising analytical tools. Despite many efforts in the design of SERS substrates, it remains a great challenge for creating a general flexible substrate that could in situ detect analytes on diverse objects. Herein, we report our attempt to address this issue by developing a facile and versatile method capable of generating silver/gold nanoparticles in situ on the surface of a cellulose acetate (CA) polymer in a simple, cheap, practical, and capping agent-free way. The as-prepared substrates exhibit excellent sensitivity, which enabled detection of Rhodamine 6G at concentrations as low as 10 ~(?12) M. Taking advantage of the excellent flexibility and optical transparency of the CA matrix, the highly SERS-active substrate was applied for in situ identification and detection of pesticide residues on fruits. The results indicated that tetramethylthiuram disulfide (TMTD) and thiabendazole (TBZ) can be clearly identified at concentrations as low as 18.05 ng cm ~(?2) and 15.1 ng cm ~(?2) , respectively, which were much lower than the maximum permitted residue doses with respect to food safety.
机译：表面增强拉曼光谱（SERS）是最有前途的分析工具之一。尽管在SERS基材的设计中很多努力，但是对于创建一个可以原位检测到不同物体的分析物的一般柔性基板仍然是一个很大的挑战。在此，我们通过开发能够在醋酸纤维素（CA）聚合物的表面上的纤维素（CA）聚合物的表面上产生银/金纳米颗粒的容易和多功能的方法来解决这一问题的尝试解决这一问题。办法。制备的底物具有出色的敏感性，使得在低至10〜（α12）M的浓度下使罗丹明6g的检测能够利用Ca基质的优异柔韧性和光学透明度，施加高度SERS-活性基材原位鉴定和检测水果对农药残留物。结果表明，四甲基硫酰尿氨酰三硫醚（TMTD）和噻虫唑（TBZ）分别可以分别以低至18.05ng cm〜（α2）和15.1ngcm〜（α2）清楚地鉴定为低于最大值的浓度允许的残留物相对于食品安全剂量。

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