Comparative study for N and S doped carbon dots: Synthesis, characterization and applications for Fe3+ probe and cellular imaging

Dual functional N- and S-co-doped carbon dots as the sensor for temperature and Fe3+ ions

“…Previous researches [28] [51] reported that Fe 3+ ions exhibit a higher affinity for N and O on the surface of C-dots. Accordingly, the photoluminescence quenching could be believed to be related to the nonradiative electron transfer process between the C-dots and Fe 3+ .…”

“…For heteroatom doped C-dots, it has been reported that the abundant functional groups containing heteroatom would be able to introduce new formed excitation energy traps [51] or passivate surface defects [31], leading to the impact on the photoluminescence of C-dots. According to the above experimental results, synergistic effects of these mechanisms were probably responsible for N/S co-doped C-dots with tunable emission.…”

Improving the functionality of carbon nanodots: doping and surface functionalization

“…135 Numerous studies reported the synthesis of S-doped C-dots using sulfuric acid, 136 sodium hydrosulfide, 87 sodium thiosulfate, 137 waste frying oil, 138 dodecanethiol, 106 ethane-sulfonic acid, 57 and 2,2′-(ethylenedithio)diacetic acid 91 as sulfur sources.…”

Reduced Graphene Oxide Boosted Ultrafine Cu2SnS3 Nanoparticles for High‐performance Sodium Storage

“…XPS spectra were conducted to detect the surface elemental chemical states of CTS/RGO composite. [29,[31][32][33] In addition, the high-resolution C 1s spectrum, demonstrated in Figure 2f, can be divided into five peaks at 284.1, 284.7, 285.6, 286.7 and 288.4 eV, arise from C=C, CÀ C/ CÀ H, CÀ S/CÀ O, CÀ OÀ C and C=O bonds, respectively. The peak of O 1s may be attributed to the residual oxygencontaining functional groups on the surface of RGO sheets, vindicated by O 1s spectrum shown in Figure S2, in which a main peak located at 531.5 eV is observed, corresponding to the CÀ O bond.…”

“…[30] As exhibited in Figure 2e, the S 2p spectrum can be well fitted into five obvious characteristic peaks of S 2p 3/2 (161.6 eV), S 2p 1/2 (162.7 eV), SÀ C (163.3 eV), CÀ S (164.4 eV) and À SO 3 H (169.9 eV), first two of which are indicative of the existence of metal sulfide and the remaining three reveal the appearance of S-doped RGO. [29,[31][32][33] In addition, the high-resolution C 1s spectrum, demonstrated in Figure 2f, can be divided into five peaks at 284.1, 284.7, 285.6, 286.7 and 288.4 eV, arise from C=C, CÀ C/ CÀ H, CÀ S/CÀ O, CÀ OÀ C and C=O bonds, respectively. [34,35] The most obvious peak of CÀ C shows that the GO has been reduced, and the existence of CÀ S bond indicates the doping of S into RGO, in consistent with the result obtained from the S 2p spectrum.…”