Large scale synthesis of photoluminescent carbon nanodots and their application for bioimaging

Abstract

Carbon nanodots (CDs) have been synthesized at gram scale with a high yield (41.8%) by carbonization of sucrose with oil acid in one simple step. The synthesized CDs are monodisperse with a narrow size distribution (average 1.84 nm in size), and show a high fluorescence quantum yield (21.6%) without passivation. The PL intensity of the obtained CDs is pH independent over a range of 2-8. Besides, their PL intensity remains unchanged even after six hours of UV excitation and six months of storage, exhibiting excellent stability. The obtained CDs have been used for cell imaging. The results demonstrate that the prepared CDs have great potential for real applications.

One-step, green, and economic synthesis of water-soluble photoluminescent carbon dots by hydrothermal treatment of wheat straw, and their bio-applications in labeling, imaging, and sensing

“…Subtle interactions between these surface atoms and surrounding molecules can significantly influence these NPs' PL characteristics, which is the main reason for them being applied to bio-sensing and detecting [39,[53][54] . It is reported that C-dots did not display any pH dependence in the pH range of 2-8 [55] . However, as shown previously in Figure 5B, among the acidic pH range (2 -5), the PL intensity of our prepared C-dots are proportional to the pH value, so in principle it could be used to sensing the proton concentration within such pH range.…”

Three dimensional carbogenic dots/TiO2 nanoheterojunctions with enhanced visible light-driven photocatalytic activity

“…In the high-resolution C1s spectra (Fig. 6b), three main separated peaks at 284.9, 286.5, and 289.2 eV are existed for the C-TiO 2 composite and C-dots, which are connected to the graphitic C-C, C-O and COOH bonds [47,48]. The ratios of O@CAO and C-O bonds in the C-dots of C-TiO 2 composite are slightly lower than those of pure C-dots, which is caused by the loss during the hydrothermal coupling process.…”

One-step synthesis of silver nanoparticles using carbon dots as reducing and stabilizing agents and their antibacterial mechanisms

“…CDs were synthesized according to the method reported by Li [37]. In particular, heating 5 g sucrose and 10 mL oleic acid in a three neck flask at a temperature of 215 °C for 5 min under vigorously stirring, impure CDs was obtained.…”