In this study, highly sensitive flexible AuNPs@ polyimide SERS heating chips (APHC) were fabricated for in situ collecting and detecting TNT. Large-scale AuNPs arrays were synthesized by liquid-liquid interface self-assembly and transferred to polyimide heating film as SERS substrates. 4-ATP and AgNPs functionalized on APHC were used as capture means and signal amplifiers, combining with TNT to form the AuNPs-TNT-AgNPs “sandwich” structure. This flexible APHC chip showed high sensitivity as enhancement factor was 5.5×10⁵, and good repeatability and stability (RSD<10%). It was applied to detect TNT solutions with a low concentration of 10⁻⁹ M, and showed a good linear response in the range from 10⁻⁵ to 10⁻⁹ M (R² = 0.986). In addition, the detection method also had good selectivity and no response to various TNT analogs. More important, combing with the thermal enrichment strategy, TNT dispersed in environmental samples such as soil, fruit and clothing would be enriched as vapor then collected and detected by APHC. This APHC device shows great potential for in situ sensing platforms, due to its sensitivity, high efficiency, and excellent portability.

在这项研究中，制造了高灵敏度的柔性 AuNPs@聚酰亚胺 SERS 加热芯片（APHC），用于原位收集和检测 TNT。通过液-液界面自组装合成了大尺寸 AuNPs 阵列，并将其转移到聚酰亚胺加热膜上作为 SERS 衬底。在 APHC 上功能化的 4-ATP 和 AgNPs 被用作捕获手段和信号放大器，与 TNT 结合形成 AuNPs-TNT-AgNPs“三明治”结构。该柔性APHC芯片灵敏度高，增强因子为5.5×10 ⁵，重复性和稳定性好（RSD<10%）。用于检测10 ^-9  M的低浓度TNT溶液，在10 ^-5至10 ^{-9范围内表现出良好的线性响应} M（R ²  = 0.986）。此外，该检测方法还具有良好的选择性，对各种TNT类似物均无反应。更重要的是，结合热富集策略，分散在土壤、水果和衣物等环境样品中的TNT将以蒸气形式富集，然后被APHC收集和检测。由于其灵敏度高、效率高和出色的便携性，该 APHC 设备显示出原位传感平台的巨大潜力。