Spectral Characteristic And Quantitative Analysis Of LIBS By Combining Magnetic Field And Au Nanoparticles

Laser-induce breakdown spectroscopy(LIBS)technology is a kind of atomic emission spectroscopy component analysis technology based on laser plasma.In the past two decades,due to its fast,non-destructive,in-situ,real-time,etc.The advantages are widely used in industrial detection,environmental monitoring,biological analysis and other fields.However,for the traditional LIBS technology,the target element spectral line intensity is weak,the repeatability is poor,and the analysis accuracy is low.These shortcomings make LIBS technology have no absolute advantage over other detection technologies,which limits the further development of LIBS technology.Therefore,increasing the intensity of the laserinduced breakdown spectroscopy,improving the spectral signal-to-noise ratio and repeatability of the spectrum have become one of the hotspots in LIBS technology research.In response to the needs of LIBS technology for spectral enhancement and improvement of quantitative analysis accuracy,nanoparticle enhanced LIBS(NELIBS)combined with cavity confinement were jointly applied to LIBS technology.The changes and quantification of spectral characteristic parameters when NELIBS combined with cavity confinement were systematically studied Analysis of changes in accuracy.In order to determine the optimal cavity confinement diameter,an aluminum sheet containing 1-6mm through-holes was made,and the optimal cavity diameter was determined to be 5mm.The 5mm diameter cavity confinement sheet and nano-gold particles were combined to change the laser pulse respectively Energy and acquisition delay time,analyze the changes of spectral characteristic parameters when traditional LIBS,cavity confinement,NELIBS,NELIBS combined with cavity confinement,and explain the cause of the phenomenon.The experimental results show that when NELIBS combined with cavity confinement can effectively enhance the spectral intensity and improve the spectral intensity,meanwhile,the plasma electron temperature and electron density are increased.Five standard stainless steels were used as experimental samples.The basic calibration method and internal standard method were used to quantitatively analyze the Ni element in four of the samples under the conditions of NELIBS combined with the cavity confinement.The fifth sample was used to quantitatively analyze the model.The evaluation was performed,and the change of the detection limit of Ni element was explored.The experimental results show that using the internal standard method in the combination mode can improve the accuracy and stability of quantitative analysis and reduce the element detection limit.