Solvent-dependent carbon dots and their applications in the detection of water in organic solvents

Abstract

In this study, solvent-dependent emitting carbon dots (CDs) were synthesized by simple one-step hydrothermal treatment of o-phenylenediamine (oPD).

Orange‐Emissive Carbon Quantum Dots: Toward Application in Wound pH Monitoring Based on Colorimetric and Fluorescent Changing

“…The emergence of two strong bands at 3315 and 3145 cm −1 was related to the stretching vibration of amino/amide NH bonds, indicating that a great number of amino groups were attached on the surfaces of O‐CDs. Moreover, the stretching vibration of CC (1616 cm −1 ), CN (1467 and 1403 cm −1 ), and CN (1510 cm −1 ) bonds were observed from FTIR spectrum, which suggest that the polyaromatic structures were formed in O‐CDs during the reaction process . The strong band at 1675 cm −1 could be related to the amide carbonyl .…”

“…The strong band at 1675 cm −1 could be related to the amide carbonyl . In addition, the bending vibration of CN (1311 cm −1 ), stretching vibration of COC (1168 cm −1 ), and asymmetric and symmetric stretching vibrations of CO (1211 and 1022 cm −1 ) were also determined from FTIR spectrum . The chemical composition and speciation of O‐CDs were also examined by X‐ray photoelectron spectroscopy (XPS), as shown in Figure F.…”

Highly fluorescent carbon dots from wheat bran as a novel drug delivery system for bacterial inhibition

“…It was also observed that the CDs exhibited red shifting of the fluorescence emission peak with increasing solvent polarity. This solvent-dependent PL characteristic can be attributed to hydrogen bonding and dipole-dipole interactions of the CDs with the solvent particles 84. It has been reported that the position of an emission peak has a linear relationship with the polarity of the solvent 85.…”

Hydrochromic carbon dots as smart sensors for water sensing in organic solvents

“…Recently, two reports have proved that the carbon dots act as visual sensors of the water content in organic solvents. 61,62 In one of the reports, Chao et al observed that the emission of the carbon dots in organic solvents was gradually red shied when the content was increased and consequently, the color change from cyan to orange was noted. 61 In another report, the uorescence of carbon dots was quenched in the presence of water.…”

“…61,62 In one of the reports, Chao et al observed that the emission of the carbon dots in organic solvents was gradually red shied when the content was increased and consequently, the color change from cyan to orange was noted. 61 In another report, the uorescence of carbon dots was quenched in the presence of water. 62 Nonetheless, the demonstrated hydrochromic properties of the carbon dots, descriptive insight on solvent dependent hydrochromism and the impact of structure on the hydrochromic characteristics were not provided.…”