Preparation of yellow emissive nitrogen-doped carbon dots from o-phenylenediamine and their application in curcumin sensing

Abstract

In this work, o-phenylenediamine (o-PD) and ethanol are used as raw materials, and a simple solvothermal method is used to prepare nitrogen-doped CDs (YNCDs) with yellow emission (λex/λem = 410/555...

Role of Noncovalent Interactions in N,P-Functionalized Luminescent Carbon Dots for Ultrasensitive Detection of Moisture in D2O: Boosting Visible-NIR Light Sensitivity

“…The UV–vis absorption spectra of the as-synthesized N,P-CDs show a strong absorption band at 404 nm, which corresponds to the n-π* transition of common functional groups, like CO, CN, etc. (depicted in Figure e), and the peak at ∼470 nm can be attributed to the N-containing molecular state as reported earlier. , Furthermore, N,P-CDs show a broad absorption shoulder in the longer-wavelength region with peak maxima at 576 and ∼610 nm, respectively. However, this broad band is missing for pure N-CD (as depicted in Figure S4a).…”

“…Furthermore, the additional low intense peaks at ∼1760 and ∼1635 cm −1 correspond to the C�O and C�C groups, respectively, while the medium peak at 1435 cm −1 can be assigned as the C�N stretching 2e), and the peak at ∼470 nm can be attributed to the N-containing molecular state as reported earlier. 38,39 Furthermore, N,P-CDs show a broad absorption shoulder in the longer-wavelength region with peak maxima at 576 and ∼610 nm, respectively. However, this broad band is missing for pure N-CD (as depicted in Figure S4a).…”

High sensitive assay of formaldehyde using resonance light scattering technique based on carbon dots aggregation

“…The N 1 s spectrum of the CDs + FA (Fig. 2d, lower part) shows three peaks at 398.8, 399.2, and 399.7 eV, which are attributed to pyrrolic N, pyridinic N, and N-H, respectively (Dong et al, 2022;Li et al, 2022;Hu et al, 2021). Comparison of the XPS profiles of the CDs and CDs + FA shows a significant difference in the C 1 s spectra (Fig.…”

“…The N 1 s spectrum of the CDs (Fig. 2d upper part) shows three peaks at 398.7, 399.2, and 400.4 eV, which results from pyrrolic N, pyridinic N, and N-H, respectively (Dong et al, 2022;Li et al, 2022). The C 1 s spectrum of the CDs + FA (Fig.…”

“…The O 1 s XPS spectrum of the CDs + FA (Fig. 2c, lower part) shows two peaks at 531.8 and 532.3 eV, attributed to C = O and C-O-C (Dong et al, 2022;Zhao et al, 2019), respectively. The N 1 s spectrum of the CDs + FA (Fig.…”