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Illustration of the process to immobilize dansyl chloride on cBN surfaces.
(a) XPS survey spectra of hydroxylated and ATPES-functionalized cBN surfaces. (b) and (c) XPS spectra of ATPES-functionalized cBN surfaces. The XPS measurements were performed on a VG ESCA Laboratory 220I-XL photoelectron spectrometer system using a monochromatized source (1486.6 eV).
(a) The fluorescence intensity quenching ratio of dansyl-chloride-functionalized cBN film sensors upon addition of different metal cations in ethanol solutions at a constant concentration of . (b) Dependence of fluorescence intensity on concentration.
Fluorescence images of the dansyl-chloride-functionalized cBN film sensor (a) in ethanol, (b) in the presence of in ethanol for 15 min, and (c) in the presence of HCl in ethanol for 15 min after the sensing test to (dimension approximately ). (d) The fluorescence spectra of dansyl-chloride-functionalized cBN film sensors before and after regeneration.
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