Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo 315211, Zhejiang, P. R. China.
Anal Methods. 2023 Mar 9;15(10):1261-1273. doi: 10.1039/d3ay00022b.
Two essential factors in powerful surface-enhanced Raman spectroscopy analysis of trace pesticide residues are , high sensitivity and efficient sampling. Herein, owing to elastic properties, a stretched Ag nanowire (Ag NW)-tape under the strain of 15% formed a wrinkled structure with periodic microridges and microgrooves, where abundant nanogaps were generated by the aggregated Ag NWs. Compared with the unstretched Ag NW-tape substrate, an appreciable signal enhancement of the modified 4-mercaptobenzoic acid (4-MBA) molecules with a ratio of 2.6 was discerned from the sophisticated SERS substrate due to the electromagnetic enhancement induced by the relatively high density of "hot spots" around the Ag NW aggregates. The as-fabricated Ag NW-tape substrate performed admirably in detecting 4-MBA and demonstrated an enhancement factor of 1.16 × 10. Moreover, for the detection of tetramethylthiuram disulfide, thiabendazole, and their mixture, the relatively high recovery rates of over 88% were favorably realized by the Ag NW-tape substrate with superior sensitivity, distinct flexibility, and adhesiveness. This fascinating SERS substrate, dependent on the flexible and adhesive Ag NW-tape, is promising for application in SERS analysis of trace residues on various practical surfaces.
在痕量农药残留的表面增强拉曼光谱分析中，两个至关重要的因素是高灵敏度和高效采样。在此，由于弹性特性，在 15%应变下拉伸的 Ag 纳米线（AgNW）带形成了具有周期性微脊和微槽的褶皱结构，其中聚集的 AgNW 产生了丰富的纳米间隙。与未拉伸的 AgNW 带基底相比，由于 AgNW 聚集周围相对高密度的“热点”引起的电磁增强，经过修饰的 4-巯基苯甲酸（4-MBA）分子的信号增强可达到 2.6 的比值，从复杂的 SERS 基底中明显识别出来。所制备的 AgNW 带基底在检测 4-MBA 时表现出色，其增强因子为 1.16×10。此外，对于四甲基秋兰姆二硫化物、噻菌灵及其混合物的检测，AgNW 带基底具有较高的灵敏度、明显的柔韧性和粘附性，实现了超过 88%的较高回收率。这种引人入胜的 SERS 基底依赖于灵活且粘附的 AgNW 带，有望应用于各种实际表面上痕量残留的 SERS 分析。
