红蓝草基比率型荧光传感碳点制备及其在pH检测中的应用OA

In this study,natural biomass Peristrophe baphica Bremk was used as the carbon source,and biomass-derived carbon dots(HCDs)with dual-emission properties were prepared via pyrolysis.Their fluorescent response performance in wide-range pH detection scenarios was systematically investigated.Under excitation at 440 nm,HCDs exhibit dual emission at 510 nm(green light)and 610 nm(red light).Within the wide range covering the full pH scale of 0-14,the intensity ratio of the dual emission peaks(F610/F510)shows a high linear relationship with pH value in both pH 0-3 and pH 4-14 ranges.The correlation coefficients(R²)are as high as 0.998 9 and 0.992 8,re-spectively,and the detection limits are as low as 0.08 pH unit and 0.48 pH unit,respectively,demonstrating excel-lent sensitivity and selectivity.This radiometric probe has excellent self-calibration ability,which can effectively overcome the limitation that traditional single-emission probes are susceptible to environmental interference.With the core advantage of wide-range detection,it has broad application prospects in environmental monitoring,bioimaging and other fields.