This study shows development of highly sensitive and stable localized surface plasmon resonance (LSPR)-active U-bent glass and polymeric optical fiber (GOF and POF) sensor probes by a seed-mediated in situ growth technique. Here, the nickel/nickel oxide seeds (Ni/NiO, 3 to 5 nm size) were formed on the U-region of the fiber probe by sputter coating nickel under a low vacuum (3 Pa), and then, gold nanostructures (AuNSs) were grown over the Ni/NiO seeds. The evanescent wave absorbance (EWA) phenomenon in the U-bent fiber probe was exploited to monitor the growth kinetics of AuNSs in real-time. Experimental observations point to a potential galvanic replacement of Ni by Au. The newly formed AuNSs on U-bent GOF and POF probes gave rise to a LSPR-based refractive index sensitivity of 27.66 and 25.65 ΔA/ΔRIU with plasmonic peak at 600 and 570 nm, respectively. These plasmonic probes show an excellent chemical and mechanical stability, in addition to high surface enhanced Raman scattering (SERS) activity. This quick and facile technique is highly suitable for large-scale manufacture of reliable plasmonic fiber optic sensor probes for chemical and bio sensing applications.

这项研究显示了通过种子介导的原位生长技术开发的高灵敏度，稳定的局部表面等离子体共振（LSPR）活性U型弯曲玻璃和聚合物光纤（GOF和POF）传感器探针。此处，通过在低真空（3 Pa）下溅射镀镍，然后在金纳米结构（AuNSs）上溅射镀镍，在纤维探针的U区域上形成镍/氧化镍种子（Ni / NiO，尺寸为3至5 nm）。 ）在Ni / NiO种子上生长。利用U形弯曲光纤探针中的e逝波吸收（EWA）现象来实时监测AuNS的生长动力学。实验观察表明，可能用金电取代镍。U形GOF和POF探针上新形成的AuNSs产生了基于LSPR的折射率敏感性，分别为27.66和25.65ΔA/ΔRIU，在600和570 nm处有等离激元峰，分别。这些等离子探针除了具有高表面增强拉曼散射（SERS）活性外，还具有出色的化学和机械稳定性。这种快速简便的技术非常适合大规模制造用于化学和生物传感应用的可靠等离子光纤传感器探头。