Physics Department, Indian Institute of Technology Delhi, New Delhi 110016, India.
Physics Department, Indian Institute of Technology Delhi, New Delhi 110016, India.
Biosens Bioelectron. 2017 May 15;91:762-769. doi: 10.1016/j.bios.2017.01.050. Epub 2017 Jan 24.
We report theoretical and experimental realization of a SPR based fiber optic nicotine sensor having coatings of silver and graphene doped ZnO nanostructure onto the unclad core of the optical fiber. The volume fraction (f) of graphene in ZnO was optimized using simulation of electric field intensity. Four types of graphene doped ZnO nanostructures viz. nanocomposites, nanoflowers, nanotubes and nanofibers were prepared using optimized value of f. The morphology, photoluminescence (PL) spectra and UV-vis spectra of these nanostructures were studied. The peak PL intensity was found to be highest for ZnO: graphene nanofibers. The optimized value of f in ZnO: graphene nanofiber was reconfirmed using UV-vis spectroscopy. The experiments were performed on the fiber optic probe fabricated with Ag/ZnO: graphene layer and optimized parameters for in-situ detection of nicotine. The interaction of nicotine with ZnO: graphene nanostructures alters the dielectric function of ZnO: graphene nanostructure which is manifested in terms of shift in resonance wavelength. From the sensing signal, the performance parameters were measured including sensitivity, limit of detection (LOD), limit of quantification (LOQ), stability, repeatability and selectivity. The real sample prepared using cigarette tobacco leaves and analyzed using the fabricated sensor makes it suitable for practical applications. The achieved values of LOD and LOQ are found to be unrivalled in comparison to the reported ones. The sensor possesses additional advantages such as, immunity to electromagnetic interference, low cost, capability of online monitoring, remote sensing.
我们报告了一种基于 SPR 的光纤尼古丁传感器的理论和实验实现，该传感器在光纤的未涂层芯上涂有银和掺杂石墨烯的 ZnO 纳米结构。使用电场强度模拟优化了 ZnO 中石墨烯的体积分数（f）。使用优化后的 f 值制备了四种类型的石墨烯掺杂 ZnO 纳米结构：纳米复合材料、纳米花、纳米管和纳米纤维。研究了这些纳米结构的形貌、光致发光（PL）光谱和紫外-可见光谱。发现 ZnO：石墨烯纳米纤维的 PL 强度峰值最高。使用紫外-可见光谱重新确认了 ZnO：石墨烯纳米纤维中 f 的优化值。使用 Ag/ZnO：石墨烯层制备的光纤探针进行了实验，并优化了用于原位检测尼古丁的参数。尼古丁与 ZnO：石墨烯纳米结构的相互作用改变了 ZnO：石墨烯纳米结构的介电函数，这表现在共振波长的移动上。从传感信号中，测量了性能参数，包括灵敏度、检测限（LOD）、定量限（LOQ）、稳定性、重复性和选择性。使用香烟烟叶制备的实际样品，并使用制造的传感器进行分析，使其适用于实际应用。与已报道的相比，所达到的 LOD 和 LOQ 值是无与伦比的。该传感器具有额外的优点，例如抗电磁干扰、低成本、在线监测能力、远程感应。
