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Electrospun flexible poly(bisphenol A carbonate) nanofibers decorated with Ag nanoparticles as effective 3D SERS substrates for trace TNT detection
Analyst ( IF 4.2 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1039/c7an01639e
Yi Li 1, 2, 3, 4, 5 , Rui Lu 1, 2, 3, 4, 5 , Jinyou Shen 1, 2, 3, 4, 5 , Weiqing Han 1, 2, 3, 4, 5 , Xiuyun Sun 1, 2, 3, 4, 5 , Jiansheng Li 1, 2, 3, 4, 5 , Lianjun Wang 1, 2, 3, 4, 5
Affiliation  

A flexible 3D hybrid PC/Ag surface-enhanced Raman scattering (SERS) substrate was fabricated through the combination of electrospinning and in situ chemical reduction. Due to the rough surface morphology and the intricate 3D structure, a high density of Raman “hotspots” was formed at the junctions of cross-linked nanofibers, resulting in excellent sensitivity to a probe molecule (4-aminothiophenol). The nanofibers were modified with L-cysteine to capture TNT molecules by the formation of a Meisenheimer complex, after which positively charged 4-ATP-labelled AgNPs were introduced to the system, which both generated more hotspots and led to a linear relationship between the TNT concentration and the SERS intensity of the labelled molecules. As a result, a good linear response ranging from 10−8 to 10−12 M was achieved, and the detection limit for TNT was as low as 2.05 × 10−13 M. This strategy demonstrates an ultra-sensitive approach for the detection of trace amounts of TNT, and a promising method for the detection of many other analogous explosives.

中文翻译:

Ag纳米粒子修饰的电纺柔性聚(碳酸双酚A碳酸酯)纳米纤维作为有效的3D SERS底物,用于痕量TNT检测

通过静电纺丝和原位化学还原相结合的方法,制造了一种柔性的3D混合PC / Ag表面增强拉曼散射(SERS)衬底。由于粗糙的表面形态和复杂的3D结构,在交联的纳米纤维的交界处形成了高密度的拉曼“热点”,从而对探针分子(4-氨基硫酚)具有出色的敏感性。纳米纤维用L改性-半胱氨酸通过形成Meisenheimer复合物来捕获TNT分子,然后将带正电荷的4-ATP标记的AgNPs引入系统,这会产生更多的热点,并导致TNT浓度与SERS强度之间的线性关系被标记的分子。结果,获得了从10 -8到10 -12 M的良好线性响应,并且TNT的检出限低至2.05×10 -13M。该策略证明了一种超灵敏的检测方法。痕量的TNT,以及用于检测许多其他类似爆炸物的有前途的方法。
更新日期:2017-11-23
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