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Blue-emissive nitrogen-doped chiral carbon dots (d-NCD230 and l-NCD230) exhibiting antipodal chiroptical activity, synthesized from the thermal pyrolysis of citric acid and d/l-aspartic acid in 1:2 molar ratios, have been explored as chirality-based fluorescent turn-off/on probes for the detection of Hg and l-cysteine (l-Cys). Circular dichroism (CD) spectroscopy revealed that the chiroptical activity originates from a synergy among intrinsic chirality, chiral precursors on the NCD surface, and hybridization of lower energy levels within the embedded chiral chromophore. Quantitative analysis of optical asymmetry using the Kuhn asymmetry factor () at the CD signal of 312 nm showed a higher value for d-NCD230 (1.03 × 10) compared to l-NCD230 (1.13 × 10). Moreover, we have demonstrated chirality transfer and chiral inversion phenomena in d/l-NCDs by preparing carbon dots with different precursor ratios at different temperatures and probing them through CD spectroscopy. The NCDs exhibited selective fluorescence quenching in the presence of Hg, demonstrating linearity in the Stern-Volmer plot. Limits of detection (LODs) for Hg were calculated to be 129 and 192 nM for d-NCD230 and l-NCD230, respectively, in the 0-150 μM concentration range. The quenching mechanism involves nonradiative electron transfer due to Hg binding to oxygen-rich functional groups on the d/l-NCD230 surface. The slight variation in LOD values between d-NCD230 and l-NCD230 indicates the negligible effect of the chirality on Hg sensing. Notably, the fluorescence intensity of d/l-NCD230 could be restored upon adding l-cysteine, with d-NCD230 showing a more pronounced enhancement than l-NCD230. This differential response is attributed to a preferential stereoselective interaction arising from the homochirality of d-NCD230/Hg and l-cysteine. These findings demonstrate the potential of chiral nitrogen-doped carbon dots as sensitive and selective probes for Hg and l-cysteine, with implications for environmental monitoring and biological sensing applications.
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http://dx.doi.org/10.1021/acsabm.4c01416 | DOI Listing |
Langmuir
December 2024
Institute of Novel Semiconductors, Shandong University, Jinan 250000, China.
With the increasing demand for food safety monitoring, the development of efficient, convenient, and green gas sensors has become a current research hotspot. Triboelectric nanogenerator (TENG) as a triethylamine sensor is a cutting-edge strategy for detection without the need for an additional power source. In this study, synthesized WO/MXene materials were prepared and bilayer thin films of carbon quantum dots (CPDs)-WO/MXene TENG.
View Article and Find Full Text PDFFood Chem
December 2024
Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, PR China. Electronic address:
A molecularly imprinted fluorescent aptasensor was designed for selective detection of quinine (Qn) based on dual functional monomers. In the sol-gel polymerization of molecularly imprinted polymers (MIPs), 3-aminopropyltriethoxysilane (APTES) and quinine aptamer (Apt) were employed as dual functional monomers, and Qn was the template molecule. Near-infrared carbon dots (RCDs) were used as fluorescence signal probe, and effectively avoided the interference of fluorescence emitted by Qn.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, NO.2699 Qianjin Street, Chaoyang District, 130000, Changchun, CHINA.
Carbonized polymer dots (CPDs) are a class of exceptional fluorescent materials with diverse applications. However, their photoluminescence (PL) mechanism remained enigmatic and controversial, hindering further development and application. While molecular fluorophores explain primary fluorescence in some CPDs, the overall PL of CPDs still cannot be fully explained, such as their excitation-dependent behaviors, let alone the modulation of PL.
View Article and Find Full Text PDFPhys Chem Chem Phys
December 2024
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
Proteins are some of the most important components in living organisms. When nanoparticles enter a living system, they swiftly interact with proteins to produce the so-called "protein corona", which depicts the adsorption of proteins on large nanoparticles (normally tens to hundreds of nanometers). However, the sizes of small nanoparticles (typically, fluorescent nanomaterials such as quantum dots, noble metal nanoclusters, carbon dots, ) are less than 10 nm, which are comparable or even much smaller than those of proteins.
View Article and Find Full Text PDFEnergy storage devices are recognized as environmentally friendly technologies. Supercapacitors, known for their high cycle stability, have been proposed as potential alternatives to fossil fuels. Recent studies have focused on selecting suitable electrode materials to achieve energy storage systems with high stability, high specific capacity, and biocompatibility.
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