abstractA novel and highly sensitiv

abstract
A novel and highly sensitive fluorescence sensor,which was based on the recovered fluorescence of a nitrogen-doped graphene quantum dot–Hg(II) system,was developed for cysteine detection. An easy,green, one-pot synthesis of nitrogen doped graphene quantum dots was established by using citric acid and urea as carbon and nitrogen sources,respectively.The fluorescence of nitrogen-doped graphene quantum dots was significantly quenched by Hg(II)because of the efficient electron transfer between nitrogen-doped graphene quantum dots and Hg(II).Subsequently, fluorescence was recovered gradually upon cysteine addition to form a stable complex with Hg(II).The fluorescence sensor showed a response to cysteine within a wide concentration range of 0.05–30 μmol L
1, with a detection limit of 1.3nmolL
1.The sensor was successfully applied to detect cysteine in honey and beer samples,with a recovery range of 98–105%.

ผลลัพธ์ (แอฟริกา) 1:

abstrakte
n roman en hoogs sensitiewe fluoressensie sensor, wat gebaseer is op die stikstof gedoteer grafeen verhaal fluoressensie van 'n quantum dot-Hg (II) System, is ontwikkel vir sistien Detection. 'N maklike, groen, een-pot sintese van stikstof gedoteer grafeen quantum dots is gestig deur die gebruik van sitroensuur en ureum as koolstof en stikstof bronne, respectively.The fluoressensie van stikstof gedoteer grafeen quantum dots is aansienlik geblus deur HG (II) as gevolg van. die doeltreffende elektronoordrag tussen stikstof gedoteer grafeen quantum dots en HG (II) .Subsequently, fluoressensie is geleidelik herstel op sisteïen bykomend tot 'n stabiele komplekse met HG (II) die fluoressensie sensor het 'n reaksie op sisteïen binne 'n wye verskeidenheid konsentrasie te vorm. van 0,05-30 sonar L? 1, met 'n opsporing limiet van 1.3nmolL? 1.Die sensor is suksesvol toegepas op sisteïen te spoor in heuning en bier monsters, met 'n herstel reeks 98-105%.