Graphene oxide functionalized micro-tapered long-period fiber grating for sensitive heavy metal sensing

Abstract

We report a Ni 2+ heavy metal sensor based on a graphene oxide (GO) functionalized micro-tapered long-period fiber grating (MTLPG) where lightmatter interaction is enhanced. With high-quality GO coating on fiber with strong adhesion and controllable thickness, the GO-coated MTLPG demonstrated a resonant wavelength shift and intensity change, corresponding to a sensitivity of up to 5.12 × 10 −4 nm ppb −1 and 3.07 × 10 -4 dB ppb −1 , respectively. Moreover, the limits of detection were 2.5 ppb and 0.27 ppb, respectively, operating in a wider concentration range of 1 ppb to 1 × 10 7 ppb. The proposed optical platform can be developed for superior chemical sensing applications.

Reflective epoxy resin/chitosan/PAA composite-functionalized fiber-optic interferometric probe sensor for sensitive heavy metal ion detection

“…Comparing the above results to our previous works, using this F–P sensor, the obtained sensing sensitivities for heavy metal ion detection were obviously improved in the order of magnitude, especially in the high concentration range. 36–38…”

Highly sensitive metal ion sensing by graphene oxide functionalized micro-tapered long-period fiber grating

“…Ni is also widely employed in the electrochemical industry, in which sensing properties by GO-MLPG have been preliminarily studied in our previous report. 42 The sensing properties of detecting mixed samples by mixing Ni 2+ with Na + and Ni 2+ with Mn 2+ are important. To this end, we have assessed the results of sensing mixture samples.…”

Long-Period Fiber Grating Sensors for Chemical and Biomedical Applications

“…The proposed sensor showed a sensitivity of 2.4 × 10 −3 dB/ppb in the cobalt ion concentration range from 1 ppb to 10 7 ppb, and a detection limit of concentrations as low as 0.17 ppb was achieved. The micro-tapered LPFG-based sensors functionalized by GO have also been implemented for Na + and Mn 2+ ion detection in [ 110 ] and Ni 2+ ion detection in [ 89 ].…”