Controllable synthesis of green and blue fluorescent carbon nanodots for pH and Cu 2+ sensing in living cells

Facile and large-scale synthesis of green-emitting carbon nanodots from aspartame and the applications for ferric ions sensing and cell imaging

“…The nearly constant FL lifetime reveals the quenching of N-CDs by Fe 3+ ions obeys a simple static quenching mechanism. Static quenching takes place when the FL material forms a complex in the ground state with the quencher [1]. Fe 3+ is known to be a strong Lewis acid due to its half-filled 3d orbital, which has a strong affinity for electron-rich groups (O/N-containing groups).…”

“…Since fluorescent carbon nanodots (CDs) were first discovered during purification process of single-walled carbon nanotubes in 2004 [1], tremendous attention has been drawn to this rising star by virtue of their fascinating features such as excellent optical properties [2], outstanding resistance to photobleaching [3], robust chemical inertness, superior biocompatibility, high watersolubility and so on. Unlike organic dye and semiconductor quantum dots, CDs usually own unique excitation-dependent fluorescence (FL) and break through the limitation of toxic heavy metal element during their formaiton.…”

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+ .…”

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

“…Top-down method employs treating starting materials such as graphitic powder or MWCNTs in harsh chemical conditions [36]. Bottom-up approaches include ultra-sonication [37], microwave pyrolysis [38] and hydrothermal treatment of small molecules such as starch [39], citric acid [40] glucose [37] and leeks [41]. Carbon nanodots used in the studies described in this chapter were prepared by the pyrolysis of oats grains [42].…”