Rare earth complexes chemiluminescence catalyzed by gold nanoparticles for fast sensing of Tb^(3+)and Eu^(3+)

Developing multiplex sensing technique is of great significance for fast sample analysis.However,the broad emissions of most chemiluminescence(CL)luminophores make the multiplex CL analysis be difficult.In this work,a simple and sensitive CL analytical method has been developed for the simultaneous determination of Tb^(3+)and Eu^(3+)thanking to their narrow band emission.The technique was based on a mixed CL system of periodate(IO4-)-hydrogen peroxide(H_(2)O_(2))-rare earth complexes,in which the reactive oxygen species(ROSs)especially singlet oxygen(^(1)O_(2))can transfer its energy to the complex of Tb^(3+)/Eu^(3+)-ethylenediaminetetraacetic acid disodium salt(EDTA)and then produce the characteristic emissions of Tb^(3+)and Eu^(3+)without cross-interference.The further experiment found that the CL emissions of Tb^(3+)and Eu^(3+)could be catalyzed by the gold nanoparticles(AuNPs)via enhancing the yield of^(1)O_(2).The CL intensities of Tb^(3+)(at 490 nm)and Eu^(3+)(at 620 nm)increased linearly with concentration of Tb^(3+)and Eu^(3+).After the optimization of the CL sensing conditions,the limits of detection(LOD)were 5.0×10^(-9)mol/L and 8.0×10^(-7)mol/L for Tb^(3+)and Eu^(3+),respectively.Finally,the method has been applied for measuring the contents of Tb^(3+)and Eu^(3+)in leaching solution of mine sample and Tb^(3+)/Eu^(3+)-contained nanomaterials with satisfactory results.The present system provides a new CL technique for multiplex sensing with simplicity and high sensitivity.