A fluorescent sensor constructed from nitrogen-doped carbon nanodots (N-CDs) for pH detection in synovial fluid and urea determination.

ABSTRACT: Blue luminescent nitrogen-doped carbon nanodots (N-CDs) with pH-dependent properties were prepared from citric acid (CA), glutathione (GSH), and polyethylene polyamine (PEPA) using a two-step pyrolytic route. The N-CDs showed stable and strong emission bands at approximately 455 nm under 350 nm excitation. Moreover, the fluorescence of N-CDs can be gradually decreased by gradually increasing the pH value. A good linear relationship between the fluorescence intensity of N-CDs and the pH range of 3.0-9.0 was obtained. Thus, the response mechanism of N-CDs to pH was systematically investigated. N-CDs possessed -NH₂, -COOH, and -CONH- as active functional groups, which allowed the variable protonation/deprotonation of N-CDs to regulate the fluorescence emission intensities under cha

SUBMITTER: Chen M 

PROVIDER: S-EPMC9091950 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature