Self-carbonization synthesis of highly-bright red/near-infrared carbon dots by solvent-free method

Abstract

Red/near-infrared fluorescent carbon dots (R-CDs) are attracting more attention in biosensing and biophotonics. However, the synthesis and purification of R-CDs are cumbersome, limiting the large-scale industrial production and application. In...

Synthesis, optical properties and applications of red/near-infrared carbon dots

“…90 Recently, the solid-state reaction has been used for the production of high-quality red C-dots. [136][137][138][139][140] Liu et al reported the red/NIR emissive C-dots prepared via a solvent-free carbonization approach with a QY of 57%. 136 Zhang et al proposed a solvent-free solid-state method for red C-dot (R-CD) synthesis by utilizing the dehydration self-carbonation effect of the HSO 3 group in 3,4-diaminobenzenesulfonic acid.…”

“…136 Zhang et al proposed a solvent-free solid-state method for red C-dot (R-CD) synthesis by utilizing the dehydration self-carbonation effect of the HSO 3 group in 3,4-diaminobenzenesulfonic acid. 137 The assynthesized R-CDs exhibit a QY of 59% and an emission wavelength in the range of 600-800 nm. Niu et al synthesized red emissive C-dots using phloroglucinol and boric acid as precursors by a solid-state reaction with a yield of up to 75%.…”

“…Although high QYs have been achieved by using aromatic compound-based precursors, the QY for the majority of the C-dots produced by the CA precursor is still low (less than 20%). Further improvement in the quality of C-dots may focus on the enhancement of the carbonation degree by using the solid-state reaction or pyrolysis reaction, [134][135][136][137][138][139][140] and the passivated surface method through post-treatment. 145 Compared to the hydrothermal reaction 147,148 and solvothermal reaction, 103,107,120 the solid-state reaction and microwave-assisted reaction may present more advantages regarding the ease of synthesis and environmental friendless during the large-scale C-dot production.…”

Fabrication of nitrogen-enriched carbon dots with green fluorescence for enzyme-free detection of uric acid

“…S3, ESI †), where the characteristic absorption bands at 3434, 1579, 1228 and 1120 cm À1 correspond to the groups of NH/OH, CQN/CQC, C-N, and C-O, respectively. 35,36 In addition, the results of XPS analyses and data of FT-IR indicate that there are abundant chemical groups on the surface of the NCDs.…”

One-pot hydrothermal synthesis of high quantum yield orange-emitting carbon quantum dots for sensitive detection of perfluorinated compounds

“…1(b) shows a wide peak centered at 221, corresponding to the (002) plane of graphene. 38 The Raman spectra display two characteristic peaks at 1361 cm À1 and 1588 cm À1 , representing D-band (sp 3 C) and G-band (sp 2 C), respectively (Fig. S4, ESI †).…”