Sino German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, China.
Center for Smart Sensing System, Julong College, Shenzhen Technology University, Shenzhen 518118, China.
Sensors (Basel). 2022 Apr 1;22(7):2709. doi: 10.3390/s22072709.
Copper ion is closely associated with the ecosystem and human health, and even a little excessive dose in drinking water may result in a range of health problems. However, it remains challenging to produce a highly sensitive, reliable, cost-effective and electromagnetic-interference interference-immune device to detect Cu ion in drinking water. In this paper, a taper-in-taper fiber sensor was fabricated with high sensitivity by mode-mode interference and deposited polyelectrolyte layers for Cu detection. We propose a new structure which forms a secondary taper in the middle of the single-mode fiber through two-arc discharge. Experimental results show that the newly developed fiber sensor possesses a sensitivity of 2741 nm/RIU in refractive index (RI), exhibits 3.7 times sensitivity enhancement when compared with traditional tapered fiber sensors. To apply this sensor in copper ions detection, the results present that when the concentration of Cu is 0-0.1 mM, the sensitivity could reach 78.03 nm/mM. The taper-in-taper fiber sensor exhibits high sensitivity with good stability and mechanical strength which has great potential to be applied in the detection of low Cu ions in some specific environments such as drinking water.
铜离子与生态系统和人类健康密切相关，即使饮用水中摄入的剂量稍高，也可能导致一系列健康问题。然而，要生产出一种高灵敏度、可靠、经济高效且抗电磁干扰的设备来检测饮用水中的 Cu 离子仍然具有挑战性。在本文中，我们通过模间干涉和沉积聚电解质层制备了具有高灵敏度的锥形光纤传感器，用于 Cu 检测。我们提出了一种新结构，通过双电弧放电在单模光纤中间形成一个二次锥形。实验结果表明，新开发的光纤传感器在折射率 (RI) 方面具有 2741nm/RIU 的灵敏度，与传统的锥形光纤传感器相比，灵敏度提高了 3.7 倍。为了将该传感器应用于铜离子检测，结果表明当 Cu 浓度为 0-0.1mM 时，灵敏度可达 78.03nm/mM。锥形光纤传感器具有高灵敏度、良好的稳定性和机械强度，有望应用于饮用水等特定环境中低浓度 Cu 离子的检测。
