ArticleScientific reports2023
Fluorescence intensity and fluorescence lifetime measurements of various carbon dots as a function of pH.
Article in Scientific reports, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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Who cites it
14 citing papers in PubMed.
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- A new insight of a pH-dependent fluorescence switching mechanism and the novel radical scavenging ability of nitrogen-doped citric acid-based carbon dots.RSC advances · 2026Article
- Iodine-doped carbon dots for fluorescence/computed tomography imaging and photodynamic therapy of tumor cells.RSC advances · 2026Article
- Highly selective sensing of tetracycline by fluorescent carbon dots derived from spent coffee groundsRSC advances · 2025Article
- Dual mode fluorescence and spectrophotometric cefixime sensing using onion juice nitrogen doped carbon dots with smartphone and paper strip readouts.Scientific reports · 2025Article
- Portable sensor for the detection of picric acid using fluorescent carbon dot embedded PVA film.RSC advances · 2025Article
- Green Synthesised Carbon Nanodots Using the Maillard Reaction for the Rapid Detection of Elemental Selenium in Water and Carbonated Beverages.Nanomaterials (Basel, Switzerland) · 2025Article
- Fluorescent EGTA-derived carbon dots for turn on-off-on detection of FeScientific reports · 2025Article
- Applications of Fluorescence Technology for Rapid Identification of Marine Plastic Pollution.Polymers · 2025Review
- Antibiofouling Coatings For Marine Sensors: Progress and Perspectives on Materials, Methods, Impacts, and Field Trial Studies.ACS sensors · 2025Review
- A synchronous fluorescence biosensor mediated by hydrogen-bonding interaction for highly selective detection of dopamine.Mikrochimica acta · 2025Article
- Ratiometric Fluorescent pH Sensing with Carbon Dots: Fluorescence Mapping across pH Levels for Potential Underwater Applications.Nanomaterials (Basel, Switzerland) · 2024Article
- N-octylpyridine hydrogen sulphate ionic liquid for multifunctional fluorescent response in different solvents.Heliyon · 2024Article
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Authors and funding
5 authors.
Funding
Abstract
Measurement and monitoring of pH are essential in both the industry and academia. It is therefore important to continue developing novel, low-cost pH sensors that provide increased accuracy over long periods of time. Particularly promising are sensors based on materials that show pH-dependent fluorescence intensity (FI) and lifetime (FL). Carbon dots (CDs) are emerging as promising candidates because of their low cost, ease of manufacturing, low toxicity, and negligible photobleaching. However, little has been done to quantify the FI and FL values of CDs. Here we report the characterisation of the pH-dependent FI and FL of four novel solvothermal synthesised CDs. The fifth CD is used as a reference sample and was synthesised following a published synthesis. The precursors for the CDs include disperse blue 1 dye, phloroglucinol, m-phenylenediamine (m-PD), N, and N-dimethylformamide (DMF). The average diameter size of the CDs ranges from 1.5 to 15 nm. An excitation wavelength of 452 nm with a bandwidth of 45 nm was used to quantify the fluorescence in the pH range 5-9. Three CDs show a decreasing trend in FI with pH, while two CDs show an increasing trend. None of the CDs shows strong FL dependence. The FL changes around 0.5 ± 0.2 ns across the tested pH range. We suggest that the differences in the fluorescence trends can be attributed to the precursors chosen for synthesising the CDs.
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