Nitrogen-doped carbon quantum dots for fluorescence detection of Cu²⁺ and electrochemical monitoring of bisphenol A

Abstract

Nitrogen-doped carbon dots were applied in the fluorescence detection of Cu2+ and electrochemical detection of BPA.

Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

“…Carbon dot (CD) is a new class of fluorescence carbon material that has been attracting considerable interest owing to their outstanding properties such as good water solubility, low toxicity, favorable biocompatibility, good photo-stability, tunable surface functionalities, and cell membrane permeability [1,2]. However, CDs have low quantum yields (QY) and few active sites, which limits their wider applications in fluorescent bioimaging [3][4][5], biosensing [6,7], ions and molecules detection [8,9], novel photoscience [10][11][12][13], and electrocatalysis [14].…”

Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

“…The Stern‐Volmer linear equation was ( F 0 ‐ F ) = 5.308 [Cu 2+ ] − 21.96 with a correlation coefficient R 2 of.997, indicating excellent analytical ability in detecting Cu 2+ with a wider detection range. The LOD was calculated to be 1.0nM (S/N = 3) and was much lower than that of previously reported fluorescence CDs probes from other green natural carbon sources (Table ). The wider detection range and lower LOD fully demonstrated that the present N‐CDs from crown daisy leaves were an ideal fluorescent sensor in the detection of Cu 2+ .…”

“…[Cu 2+ ] − 21.96 with a correlation coefficient R 2 of.997, indicating excellent analytical ability in detecting Cu 2+ with a wider detection range. The LOD was calculated to be 1.0nM (S/N = 3) and was much lower than that of previously reported fluorescence CDs probes from other green natural carbon sources 5,7,9,31,39,[42][43][44][45][46][47][48][49][50][51] (Table 1) experiments of the prepared probe toward Cu 2+ were carried out after the probe was stored at 4°C in a refrigerator for 7 days to study its measurement stability, and the result showed no observable change in fluorescence signals, which proved that the prepared N-CD probe had high measurement stability toward Cu 2+ .…”

“…As seen, the photoluminescence wavelengths were dependent on the excitation wavelengths ranging from 300 to 400 nm, and photoluminescence wavelengths showed red shift, and intensities decrease with the increasing excitation wavelength, while the maximum fluorescence intensity was excited by 300 nm. The results indicated that the photoluminescence of the prepared N‐CDs had excitation‐dependent property, which could be related to the existence of N‐CDs with different sizes and different surface states …”

“…The results indicated that the photoluminescence of the prepared N-CDs had excitation-dependent property, which could be related to the existence of N-CDs with different sizes and different surface states. 15,39 The influence of pH value of N-CD solution on the fluorescence spectra intensity was also investigated. As shown in Figure 4B…”