Fluorescence sensing of Cu2+ ion and imaging of fungal cell by ultra-small fluorescent carbon dots derived from Acacia concinna seeds

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+ .…”

“…Many methods for Cu 2+ detection have been widely studied, such as inductively coupled plasma–mass spectrometry (ICP‐MS), atomic absorption spectroscopy, electrochemical voltammeter, and fluorescence methods . In comparison with other detection techniques, fluorescence method has outstanding advantages such as simplicity, low cost, easy operation, and high sensitivity . So far, many kinds of fluorescent probe materials including organic molecule, nanoparticle, and semiconductor nanoparticles have been prepared for Cu 2+ detection; nevertheless, these fluorescent probes have disadvantages of requiring complicated synthetic produce, expensive raw materials, and potential high toxicity, which limited their fluorescence sensing applications.…”

“…[4][5][6] In comparison with other detection techniques, fluorescence method has outstanding advantages such as simplicity, low cost, easy operation, and high sensitivity. [7][8][9] So far, many kinds of fluorescent probe materials including organic molecule, 6 nanoparticle, 10,11 and semiconductor nanoparticles 12,13 have been prepared for Cu 2+ detection; nevertheless, these fluorescent probes have disadvantages of requiring complicated synthetic produce, expensive raw materials, and potential high toxicity, which limited their fluorescence sensing applications. Similar to other nanoparticles or semiconductor quantum dots, 14 fluorescence carbon dots (CDs) have also been widely researched as a high fluorescent probe because of their excellent photostability, low toxicity, and favorable biocompatibility.…”

Fabrication of cefotaxime sodium-functionalized gold nanoclusters for the detection of copper ions in Chinese herbal medicines

“…Compared to the abovementioned techniques, the uorescence method is more favorable because of its low-cost, good selectivity, low detection limit and real-time monitoring with a fast response. [10][11][12][13][14] Recently, uorescent metal nanoclusters, including gold nanoclusters (AuNCs), silver nanoclusters (AgNCs) and copper nanoclusters (CuNCs), have gained signicant attention for application in analytical sensors. [15][16][17][18][19][20][21] AuNCs, which consist of several to a few hundred Au atoms with a typical size less than 2 nm, comparable to the Fermi wavelength of the electrons, have gained signicant interest in chemical, biological, and environmental analysis due to their distinct advantages of simple preparation, extraordinary stability, satisfying luminescence quantum yield (QY), and biocompatibility.…”