▎ 摘　　要

Surface functionalization of graphene quantum dots (GQDs) with antimorphine produced a new turn-on fluorescent nanosensor for morphine detection. The antimorphine-GQDs were prepared through the covalent conjugation of GQDs with antimorphine. FT-IR and X-ray photoelectron spectroscopies (XPS) confirmed the conjugation of antimorphine to GQDs. Fluorescence intensity of the antimorphine-GQDs enhanced after addition of morphine allowing its sensitive determination with detection limit of 0.06 mu M. Further experiments revealed that this nanosensor has no interaction with other narcotics such as methamphetamine and codeine. Thus, it can act as inexpensive and selective nanosensor for specification of low concentrations of morphine. (C) 2019 Elsevier B.V. All rights reserved.