: A schematic view of a black phosphorus tilted fiber grating device and its optical modulation, b): experimental steps for heavy metal ion detection, c): spectra of TM mode resonances at different heavy metal ion concentrations, d) resonance of spectra at different heavy metal ion concentrations Figure
Recently, researchers from the Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences Lvjian Cheng, Yu Xuefeng and Professor Chen Xianfeng from the British Bangor University successfully developed the first black phosphorus-based optical fiber chemical sensor to realize ultra-sensitive detection of heavy metal ions.
Tilted fiber grating is a new type of optical fiber device. The large-angle tilted grating structure can forward the core optical fundamental mode to the fiber cladding to form a series of discrete resonance peaks at a specific wavelength. The coupling of light with the outside world Medium refractive index changes, etc. Therefore, the inclined fiber grating is very suitable for sensing applications of photonic devices.Phosphatin is a direct concern in recent years with a direct two-dimensional semiconductor bandgap materials, with a unique two-dimensional The planar structure, ultra-high specific surface area, numerous active sites, and the broad spectral response range from visible to infrared show great promise in optical detection.
For the first time, the research team combined black phosphorus with tilted fiber gratings to reveal the unique optical modulation of the black phosphorus nanostructures and to build a new type of ultra-sensitive chemical sensor with the unique optical structure of a tilted grating A modified technique of in-situ lamination has been developed to attach black-phosphorus nanosheets efficiently to the surface of optical fiber devices. The black-phosphorus nanosheets of different thicknesses exhibit unique modulation of optical signals. With this feature, The ability to detect heavy metal lead ions at sub-ppb levels with ultra-high sensitivity, ultra-low detection limits, and a broad range of concentrations of optical sensors enables the successful development of new black-phosphorus optical fiber sensors that will provide chemical and biological sensing A superior optical detection platform, thus promoting the research and application of black phosphorus chemical biosensors.
Relevant research results have been published in Sensors and Actuators B: Chemical. The research was funded by the National Natural Science Foundation of China and the EU's Seventh Framework Program.
