石墨烯
X射线光电子能谱
材料科学
氧化物
傅里叶变换红外光谱
扫描电子显微镜
纤维
栅栏
离子
分析化学(期刊)
光纤传感器
纳米技术
光电子学
光学
化学工程
化学
复合材料
色谱法
物理
工程类
有机化学
冶金
作者
Xin Kang,Ruiduo Wang,Man Jiang,Erkang Li,Yarong Li,Xiaoxin Yan,Tianqi Wang,Zhaoyu Ren
标识
DOI:10.1016/j.yofte.2021.102807
摘要
We report a highly sensitive label-free chemical sensor for the detection of heavy metal ions. The sensor was derived from a micro-tapered long-period fiber grating (MTLPFG) functionalized by graphene oxide and poly-dopamine modified graphene oxide, respectively. Because of the combination of chemical bonding and optical tweezer effect, the materials were deposited on the MTLPFG fiber grating surface. The morphology and elemental composition of the nanocomposites were characterized by scanning electron microscope, Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Herein, we demonstrate a high sensitivity MTLPFG detection of cobalt ions in a large concentration range from 1 ppb to 107 ppb. The highest sensitivity of 2.4 × 10−3 dB∙ppb−1 at the PDA concentrations of 0.05 g∙L−1 was obtained by MTLPFG functionalized with PDA-GO (PDA-GO-MTLPFG). The result was significantly higher than GO-deposited MTLPFG (GO-MTLPFG). The proposed PDA-GO-MTLPFG demonstrates superior application value in chemical sensing fields.
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