Green preparation of nitrogen doped carbon quantum dot films as fluorescent probes

Abstract

A facile and economical hydrothermal method was developed for the preparation of highly luminescent NCDs by using cabbage juice as carbon source and PP as nitrogen source. The fluorescence intensity of CA-NCDs was quenched by Fe3+ with high sensitivity and selectivity.

Effect of heteroatoms on the optical properties and enzymatic activity of N-doped carbon dots

“…Carbon dots (CDs) are an emerging class of nanomaterials that have attracted immense attention owing their easy accessibility through simple and low-cost synthetic processes, excellent optical properties, and biocompatibility. [1][2][3][4] Such new materials have great potential for a variety of applications, including cell labeling, [5][6][7] medical therapy, 8,9 sensing, 10 catalysis, 11,12 energy, 1,[13][14][15][16] and energy storage. 14,15 In particular, one of the most attractive advantages of CDs is that their physicochemical properties can be tuned by controlling their size, surface state, and intrinsic electronic structures.…”

“…[1][2][3][4] In this context, much effort has been devoted to the design and fabrication of heteroatom-doped CDs (e.g., N-, B-, and S-doped CDs) and their application. 1,17,18 Among the heteroatom-doped CDs, nitrogen-doped CDs (N-CDs) are the most frequently utilized platform, because the nitrogen atoms are known to alter the edge states, 19,20 energy levels, [21][22][23] physicochemical properties, 6,13,17,[19][20][21][22][24][25][26][27][28][29][30][31] and even catalytic activities 9,11,[32][33][34] of the CDs. However, the effects of the heteroatom content and chemical bonding in CDs on their properties under subtle variation of the synthetic conditions are not fully understood.…”

Synthesis of green-emitting carbon quantum dots with double carbon sources and their application as a fluorescent probe for selective detection of Cu2+ ions

“…31 In order to improve the application prospects of CQDS, researchers have adopted various methods to modify CQDS, most commonly heteroatom doping (such as N, S, P, etc.). 29 Bran is the by-product of wheat processing our and is a kind of production waste and mainly contains C, N and O elements. In this paper, we have used tartaric acid and bran as the double carbon source, and the bran contains N element, so the bran can also be used as the nitrogen source to prepare N-doped green-emitting carbon quantum dots (G-CQDs).…”

“…He et al developed a facile synthetic method using cabbage juice to synthetic N-doped carbon dots (NCDs) to detect Fe 3+ and the detection limit was 1.4 nM. 29 Wang et al presented the multicolored emission carbon dots to detect Fe 3+ and Cu 2+ ions through assigning a different colored emission carbon dot to a different metal ion. 30 Zhang et al introduced a hydrothermal approach for obtaining N-doped carbon dots (NCDs) from ammonium citrate and urea.…”