Polarity-dependent emission from hydroxyl-free carbon nanodots

Abstract

Hydroxyl free CNDs are synthesized and separated as polar (P) and non-polar (NP) CNDs according to their degree of polarity. NP-CNDs exhibit excitation wavelength-independent emissions while P-CNDs exhibit excitation wavelength-dependent emissions.

Functional Group Modulation in Carbon Quantum Dots for Accelerating Photocatalytic CO2 Reduction

“…PL-dependent behavior measurements at different excitation wavelengths between 400 and 540 nm were carried out to elucidate the origin of the PL emission, as shown in Figure S1 . Unlike the conventional excitation-wavelength-dependent PL behaviors, all the R-CQD samples exhibited almost unexcited emission over a wide range of wavelengths, and the PL spectra remained constant at different excitation wavelengths, indicating a uniform emission state …”

“…24 Unlike the conventional excitationwavelength-dependent PL behaviors, all the R-CQD samples exhibited almost unexcited emission over a wide range of wavelengths, and the PL spectra remained constant at different excitation wavelengths, indicating a uniform emission state. 25 To provide further evidence for our hypothesis, we investigated the time-resolved PL decay curves of the three R-CQDs under excitation at 485 nm, as shown in Figure 1d. Notably, all three R-CQDs exhibited nearly identical singleexponential decay behaviors.…”

Open system synthesis of narrow-bandwidth red-fluorescent carbon quantum dots with a function of multi-metal ion sensing

“…5) were deconvoluted into two peaks corresponding to CQC/C-C/C-N (284.7-284.8 eV) and C-OH (287.5-287.8 eV). 17,42,43 Table S2 (ESI †) lists the proportions of the respective peak area ratios. The formation of CQDs via dehydration-condensation was confirmed from the increased CQC/C-C/C-N ratio and the decreased C-OH ratio in PG-CQDs and DAR-CQDs, relative to those in PG and DAR.…”