State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, PR China; School of Light Industry Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, PR China.
Key Laboratory of Fine Chemicals in Universities of Shandong, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, PR China.
Talanta. 2019 Nov 1;204:189-197. doi: 10.1016/j.talanta.2019.05.110. Epub 2019 May 30.
It is fairly crucial to detect inorganic explosives through a sensitive and fast method in the field of public safety, nevertheless, the high non-volatility and stability characteristics severely confine their accurate on-site detection from a real-world surface. In this work, an efficient, simple and cost effective method was developed to fabricate uniform silver nanoparticles (AgNPs) immobilized on polyurethane (PU) sponge through the in-situ reduction of polydopamine (PDA) based on mussel-inspired surface chemistry, in virtue of a large quantities catechol and amine functional groups. The formed PU@PDA@Ag sponges exhibited high SERS sensitivity, uniformity and reproducibility to 4-Aminothiophenol (4-ATP) probe molecule, and the limit of detection was calculated to be about 0.02 nmol L. Moreover, these PU@PDA@Ag sponges could be served as excellent flexible SERS substrates to rapidly detect trace inorganic explosives with high collection efficiency via swabbing extraction. The detection limit for perchlorates (ClO), chlorates (ClO) and nitrates (NO) were approximately down to 0.13, 0.13 and 0.11 ng respectively. These flexible substrates not only could drastically increase the sample collection efficiency, but also enhance analytical sensitivity and reliability for inorganic explosive, and would have a great potential application in the future homeland security fields.
在公共安全领域，通过灵敏快速的方法检测无机炸药是非常重要的，然而，高的非挥发性和稳定性特征严重限制了它们在真实表面的准确现场检测。在这项工作中，通过基于贻贝启发的表面化学的原位还原聚多巴胺（PDA），开发了一种高效、简单且具有成本效益的方法来制备均匀的负载在聚氨酯（PU）海绵上的银纳米粒子（AgNPs），利用大量的儿茶酚和胺官能团。所形成的 PU@PDA@Ag 海绵对 4-巯基苯胺（4-ATP）探针分子表现出高的 SERS 灵敏度、均匀性和重现性，检测限约为 0.02 nmol L。此外，这些 PU@PDA@Ag 海绵可用作优异的柔性 SERS 基底，通过擦拭提取以高收集效率快速检测痕量无机炸药。检测到的高氯酸盐（ClO）、氯酸盐（ClO）和硝酸盐（NO）的检测限分别约为 0.13、0.13 和 0.11 ng。这些柔性基底不仅可以极大地提高样品收集效率，而且还可以增强对无机炸药的分析灵敏度和可靠性，在未来的国土安全领域具有很大的应用潜力。
