The accurate and early detection of Mycobacterium tuberculosis (Mtb) is of great significance for the clinical diagnosis and treatment of tuberculosis. In this work, we report a facile method for the controllable synthesis of a novel few-layered two-dimensional graphdiyne nanosheet (GDY NS) with a thickness of only ∼0.9 nm via an electrochemical lithium-intercalation strategy, which possesses a prominent fluorescence quenching effect. The few-layered GDY NS with its strong adsorptivity for single-stranded DNA is first proposed as a new fluorescent sensing platform for the real-time detection of DNA with excellent specificity, multiplicity, and superhigh sensitivity (limit of detection as low as 25 pM). This sensing platform can be further applied for the Mtb detection from clinical samples and the identification of drug-resistant mutants with a low background and a high signal-to-noise ratio. Herein, we provide a potential basis for the clinical development of rapid, sensitive, and accurate substitutes for the molecular diagnosis of Mtb and its drug-resistant genes.
Keywords: DNA detection; Mycobacterium tuberculosis; fluorescence sensing; graphdiyne; lithium-intercalation strategy.