Nitrogen-Doped Graphene Oxide Dots-Based "Turn-OFF" H₂O₂, Au(III), and "Turn-OFF-ON" Hg(II) Sensors as Logic Gates and Molecular Keypad Locks.

ABSTRACT: Fluorescent nitrogen-doped graphene oxide dots (NGODs) have been demonstrated as an on-off nanosensor for the detection of Hg²⁺, Au³⁺, and H₂O₂. As compared to l-cystine, where the luminescence signal recovery results from the detachment of Hg²⁺ from the NGODs, signal recovery through l-ascorbic acid (turn-off-on model) has been attributed to the reduction of Hg²⁺ to Hg⁰. The sustainable recovery of the photoluminescence signal is demonstrated using common citrus fruits containing vitamin C (l-AA), suggesting a promising practical usage of this sensing system. Additionally, the sensitivity of NGOD- and AA-originated signal recovery from the Hg(II)-NGODs mixture has been successfully tested in Hg²⁺ ion-s

SUBMITTER: Bogireddy NKR 

PROVIDER: S-EPMC6648105 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature