The organic fluorescent probes were widely explored for specific detection of chemical nerve agent simulants.However,the fluorescence quenching,long-time response,and limitation of detection further impeded their prac...The organic fluorescent probes were widely explored for specific detection of chemical nerve agent simulants.However,the fluorescence quenching,long-time response,and limitation of detection further impeded their practical applications.Herein,the fluorescent nanofiber chitosan-1 was prepared through the modification of chitosan with 1,8-naphthalimide as fluorophore and piperazine as the detection segment.The high specific surface of fluorescent nanofiber chitosan-1 showed ultrasensitive and selective detection of diethyl chlorophosphate(DCP)in solution and vapor.The satisfied linear relationship between the fluorescent intensity and the concentration of DCP ranging from 0μmol/L to 100μmol/L was obtained.The limitation of detection was measured as low as 2.2 nmol/L within 30 s.The sensing mechanism was explored through the photoinduced electron transfer(PET)mechanism which was confirmed by ^(1)H,^(31)P NMR,and mass spectra(MS).The ultrasensitive detection of nanofibers may provide valuable insights for enhancing the sensing performance in visually detecting chemical nerve agents.展开更多
基金financial support from the National Natural Science Foundation of China(Nos.82104065,32061143045,22276142,22474003)the National Key Research&Development Program(Nos.2019YFE0123100,2022YFE0199800)+2 种基金Anhui Provincial Natural Science Foundation(No.2208085MB38)Anhui Provincial Natural Science Foundation for Distinguished Young Scholars(No.2008085J11)Foundation of Education Department of Anhui Province(No.2022AH010023).
文摘The organic fluorescent probes were widely explored for specific detection of chemical nerve agent simulants.However,the fluorescence quenching,long-time response,and limitation of detection further impeded their practical applications.Herein,the fluorescent nanofiber chitosan-1 was prepared through the modification of chitosan with 1,8-naphthalimide as fluorophore and piperazine as the detection segment.The high specific surface of fluorescent nanofiber chitosan-1 showed ultrasensitive and selective detection of diethyl chlorophosphate(DCP)in solution and vapor.The satisfied linear relationship between the fluorescent intensity and the concentration of DCP ranging from 0μmol/L to 100μmol/L was obtained.The limitation of detection was measured as low as 2.2 nmol/L within 30 s.The sensing mechanism was explored through the photoinduced electron transfer(PET)mechanism which was confirmed by ^(1)H,^(31)P NMR,and mass spectra(MS).The ultrasensitive detection of nanofibers may provide valuable insights for enhancing the sensing performance in visually detecting chemical nerve agents.
