N,S,P Co-Doped Carbon Nanodot Fabricated from Waste Microorganism and Its Application for Label-Free Recognition of Manganese(VII) and l-Ascorbic Acid and AND Logic Gate Operation

Abstract

A novel fluorescent probe based on N,S,P codoped carbon nanodots (N,S,P-CND) is very simple and quickly fabricated by a one-step hydrothermal pyrolysis of Saccharomyces cerevisiae and utilized for label-free and "on-off-on" sequential detection of manganese(VII) and l-ascorbic acid (l-AA). The fluorescence of N,S,P-CND can be effectively quenched by Mn(VII) based on an inner filter effect (IFE) and recovered upon the addition of l-AA due to the easy conversion of Mn(VII) to reduced states (i.e., Mn(IV), Mn(II), and Mn(0)) by l-AA. This probe exhibited favorable selectivity and sensitivity toward Mn(VII) and l-AA with detection limits of 50 nmol/L and 1.2 μmol/L, respectively. Simultaneously, an "AND" logic gate based on the as-fabricated N,S,P-CND has been constructed. Also, the as-proposed fluorescent probe was extended to detect Mn(VII) and l-AA in biosystems. Furthermore, the as-constructed fluorescent probe system was successfully applied to the analyses of Mn(VII) in tap water, Fenhe River water, and medicinal herb samples with satisfactory results. The proposed method is simple and easily accessible, demonstrating the great potential of N,S,P-CND in biosensing, disease diagnosis, cellular labeling, and environmental monitoring.

Turning waste into wealth: nitrogen‐doped carbon quantum dots derived from fruits wastes for sensing

“…In view of the reducibility of l ‐AA and the strong oxidizing of MnO 4 − , the l ‐AA was utilized to remove MnO 4 − . [ 23 ] When l ‐AA was titrated into the mixture of N‐CQDs and MnO 4 − , the fluorescence intensity recovered (Figure 4d). It was hypothesized that the redox reaction between MnO 4 − and l ‐AA eliminated the IFE of MnO 4 − towards the N‐CQDs.…”

Heteroatom tri-doped porous carbon derived from waste biomass as Pt-free counter electrode in dye-sensitized solar cells

“…The strong peaks at 284.6 and 286.1 eV are associated with the graphite-like sp 2 C and C 1s state in C-N/C-O, respectively. 29,37 The low subpeak at 289.2 eV is attributed to formation of C]O bond. Meanwhile, the core level spectrum of N 1s can be deconvoluted into three subpeaks at 398.6, 399.9 and 400.9 eV, as shown in Fig.…”

Carbon quantum dots derived from the extracellular polymeric substance of anaerobic ammonium oxidation granular sludge for detection of trace Mn(vii) and Cr(vi)

“…S4 †), which are consistent with the ndings from previous study. 16 Interestingly, two peaks at l ex ¼ 350 nm and l em ¼ 450 nm for the CQDs overlapped with the UV/Vis absorption of Mn(VII), resulting in a possible inner lter effect (IFE) during the Mn(VII) assay. 28 Similarly, the Cr(VI) solution shared two absorption overlaps at 270 nm and 370 nm with the CQDs at l ex ¼ 350 nm and l em ¼ 450 nm.…”

“…The uorescence attenuation spectra of CQDs and Mn(VII) and Cr(VI) anions were determined by steady-state/transient uorescence spectrometer. 16,17 The time-dependent single photon counting (TCSPS) principle is interpreted as follows. The sample emits a uorescent photon signal upon the pulse light source excites the sample.…”