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(a) Solvent effect of O-CDs (0.15 mg/mL). (Solvent from left to right: water, methanol, acetone and tetrahydrofuran). (b) X axis: the polarity index of different solvents (water, methanol, acetonitrile, acetone, chloroform, tetrahydrofuran); Y axis: the maximum emission wavelength of O-CDs; the linear relation between the two factors can be described as following equation: Y = 11.33X + 454.31, R2 = 0.91.
