Highly Selective Fluorescence Sensor Based on Graphene Quantum Dots for Sulfamethoxazole Determination.
Thi Hoa LeHyun-Jong LeeJi Hyeon KimSang Joon ParkPublished in: Materials (Basel, Switzerland) (2020)
In our research, a reliable fluorescence sensor for the detection of sulfamethoxazole (SMZ) was developed. This method relies on graphene quantum dots (GQDs) entrapped in a silica molecularly imprinted polymer (GQDs@SMIP), which was synthesized by the polymerization using GQDs, SMZ, tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTES) as fluorescence material, template, cross-linker, and functional monomers, respectively. The GQDs@SMIP was characterized by fluorometry, Fourier-transform infrared spectroscopy, transmission and scanning electron microscopies, X-ray photoelectron spectroscopy, and powder X-ray diffraction. The GQDs@SMIP exhibited a good capacity to absorb SMZ from solution, which resulted in the quenching of the GQD fluorescence intensity. The intensity of GQDs@SMIP decreased linearly with the SMZ concentration in the range of 1 to 100 µM with a correlation coefficient of 0.99537. In addition, the fluorescence responses of GQDs@SMIP to interfering substances were investigated. The results indicated that there was no effect of interfering substances on SMZ detection. Thus, the highly selective GQDs@SMIP fluorescence sensor is an effective and promising device for SMZ detection and analysis.
Keyphrases
- energy transfer
- single molecule
- quantum dots
- molecularly imprinted
- high resolution
- electron microscopy
- solid phase extraction
- loop mediated isothermal amplification
- high intensity
- real time pcr
- atomic force microscopy
- drinking water
- computed tomography
- dual energy
- microbial community
- ionic liquid
- solid state
- simultaneous determination