Fig. 1From: A cationic quantum dot-based ratiometric fluorescent probe to visually detect berberine hydrochloride in human blood serumsa TEM images of CPC-CQDs (inset: HRTEM image of CPC-CQDs; background: particle size distribution of CPC-CQDs). b Absorption (blue), excitation spectra (red), and emission spectra (black) of CPC-CQDs. c FTIR spectra of CPC-CQDs. d Absorption of the materials and mixtureBack to article page