A unique dual-excitation carbon quantum dots: Facile synthesis and application as a dual-“on-off-on” fluorescent probe

Temperature- and pH-Sensitive Nitrogen and Sulfur Codoped Carbon Quantum Dots for Sequential Detection of Fe3+ and H2S

“…To date, several fluorescent nanomaterials have been reported to be used alone for Fe 3+ , H 2 S, temperature, or pH determination, such as carbon quantum dots (CQDs), organic dyes, and fluorescent polymers . More recently, CQDs have become research hotspots in the field of nanomaterials because of their good water solubility, stable physical and chemical properties, easy surface modification, and low price , and have been widely used in the optical analysis, biological information sensing, cell imaging, and clinical disease diagnosis. , However, the traditional application of CQDs is relatively single, and it needs to be modified to expand its application range. Research has shown that heteroatom doping generates new p-type or n-type carriers near the valence or conduction bands, significantly improving the optical properties, surface chemistry properties, and detection sensitivity of CQDs .…”

Bismuth- and gadolinium-codoped carbon quantum dots with red/green dual emission for fluorescence/CT/T1-MRI mode imaging

“…5a) could be assigned to the π–π* transition of the CC bond and the n–π* transition of the CO bond, respectively. 42 Undoped CQDs have a different absorption peak intensity than Bi,Gd-CQDs because of the interference of the Bi and Gd atoms in the CQD energy band. 43 The emission spectra of Bi,Gd-CQDs display two excitation and emission peaks (Fig.…”

Heavy metal ion detection using green precursor derived carbon dots

“…As the bottom-up pathway is attractive due its simple application and easily tunable properties ( Chahal et al., 2021 ), it has been the main approach to obtain CDs ( da Júnior et al., 2021 ). Here the small size components (organic molecular precursors) are self-assembled by physical or chemical processes ( Kashani et al., 2019 ; Baragau et al., 2021 ; Li et al., 2021b ) such as hydrothermal, solvothermal, pyrolysis, combustion, microwave-assisted, or electrochemical process to promote the interaction and the formation of CDs ( Shaker et al., 2020 ; Deng et al., 2021 ; Hou et al., 2021 ; Xu et al., 2021 ). Among them, the foremost techniques for biomass-derived CDs have been the hydrothermal/solvothermal method and pyrolysis.…”