Antohe Iulia, Iordache Iuliana, Antohe Vlad-Andrei, Socol Gabriel
National Institute for Lasers, Plasma and Radiation Physics (INFLPR), Atomiștilor Street 409, 077125, Măgurele, Ilfov, Romania.
Faculty of Physics, Research and Development Center for Materials and Electronic and Optoelectronic Devices (MDEO), University of Bucharest, Atomiștilor Street 405, 077125, Măgurele, Ilfov, Romania.
Sci Rep. 2021 May 12;11(1):10086. doi: 10.1038/s41598-021-89396-w.
The paper reports for the first time an innovative polyaniline (PANI)/platinum (Pt)-coated fiber optic-surface plasmon resonance (FO-SPR) sensor used for highly-sensitive 4-nitrophenol (4-NP) pollutant detection. The Pt thin film was coated over an unclad core of an optical fiber (FO) using a DC magnetron sputtering technique, while the 4-NP responsive PANI layer was synthetized using a cost-effective electroless polymerization method. The presence of the electrolessly-grown PANI on the Pt-coated FO was observed by field-emission scanning electron microscopy and subsequently evidenced by energy dispersive X-ray analysis. These FO-SPR sensors with a demonstrated bulk sensitivity of 1515 nm/RIU were then employed for 4-NP sensing, exhibiting an excellent limit-of-detection (LOD) in the low picomolar range (0.34 pM). The proposed sensor's configuration has many other advantages, such as low-cost production, small size, immunity to electromagnetic interferences, remote sensing capability, and moreover, can be operated as a "stand-alone device", making it thus well-suited for applications such as "on-site" screening of extremely low-level trace pollutants.
本文首次报道了一种用于高灵敏度检测4-硝基苯酚（4-NP）污染物的新型聚苯胺（PANI）/铂（Pt）涂层光纤表面等离子体共振（FO-SPR）传感器。采用直流磁控溅射技术在光纤（FO）的裸芯上涂覆Pt薄膜，同时采用经济高效的化学镀聚合法合成对4-NP有响应的PANI层。通过场发射扫描电子显微镜观察了化学镀生长的PANI在Pt涂层FO上的存在情况，并随后通过能量色散X射线分析进行了证实。这些具有1515 nm/RIU体灵敏度的FO-SPR传感器随后用于4-NP传感，在低皮摩尔范围（0.34 pM）表现出优异的检测限（LOD）。所提出的传感器配置还有许多其他优点，如低成本生产、尺寸小、抗电磁干扰、遥感能力，而且可以作为“独立设备”运行，因此非常适合用于极低水平痕量污染物的“现场”筛查等应用。
