Cu–N Dopants Boost Electron Transfer and Photooxidation Reactions of Carbon Dots

Abstract

The broadband light-absorption ability of carbon dots (CDs) has inspired their application in photocatalysis, however this has been impeded by poor electron transfer inside the CDs.H erein, we report the preparation of Cu-N-doped CDs (Cu-CDs) and investigate both the doping-promoted electron transfer and the performance of the CDs in photooxidation reactions.T he Cu-N doping was achieved through aone-step pyrolytic synthesis of CDs with Na 2 [Cu(EDTA)] as precursor.A sc onfirmed by ESR, FTIR, and X-rayp hotoelectron spectroscopies,the Cu species chelates with the carbon matrix through Cu-N complexes.A saresult of the Cu-N doping, the electron-accepting and -donating abilities were enhanced 2.5 and 1.5 times,a nd the electric conductivity was also increased to 171.8 mscm À1 .A saresult of these enhanced properties,t he photocatalytic efficiency of CDs in the photooxidation reaction of 1,4-dihydro-2,6-dimethylpyridine-3,5-dicarboxylate is improved 3.5-fold after CD doping.

Carbon Quantum Dots: A Component of Efficient Visible Light Photocatalysts

“…Doping with heteroatoms has been proved to be an effective way to promote electron transfer and thus the performance of the CQDs as photocatalyst. Cu-N co-doping of CQDs was achieved by Wu et al [53] through an one-step pyrolytic synthesis with Na 2 [Cu(EDTA)] as precursor ( Figure 8A). As a result of the Cu─N doping, the electron accepting and donating abilities of CQDs could be both enhanced, together with the increased electric conductivity.…”

Bioinspired Synthesis of Cu2+‐Modified Covalent Triazine Framework: A New Highly Efficient and Promising Peroxidase Mimic

“…The disappearance of the carbonitrile band at 2236 cm À1 suggests ac omplete trimerization reaction, while the appearance of strong absorption bands at 1383 and 1620 cm À1 indicatethe formation of triazine rings. [36] In the powder X-ray diffraction (XRD) patterns of CTF andC CTF (Figure 2), only the prominent diffraction peak at around 2 q = 258 was observed, indicating the amorphous morphologyo f the as-prepareds amples. [36] In the powder X-ray diffraction (XRD) patterns of CTF andC CTF (Figure 2), only the prominent diffraction peak at around 2 q = 258 was observed, indicating the amorphous morphologyo f the as-prepareds amples.…”

Facile synthesis of N-rich carbon quantum dots from porphyrins as efficient probes for bioimaging and biosensing in living cells

“…[30][31][32][33] However, the development of functional CQDs doped with transition metal using fixed metal complexes as precursors is yet to be reported. [34][35][36] Tetraphenylporphyrin (TPP) is the simplest tetrapyrrole, which could easily chelate with various transition metals such as Pd, Pt, Fe, Co, and so on. Using TPP or its metal complexes as precursor, a flaky graphite structure could be easily formed due to their planar geometries.…”