Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 6, Pages 3270-3279Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta11781d
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Funding
- LSBU
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Blue-luminescent N-doped carbon quantum dots (NCQDs) exhibiting rarely observed excitation independent optical properties are synthesised from citric acid in the presence of ammonia via a Continuous Hydrothermal Flow Synthesis (CHFS) approach. CHFS is an eco-friendly, rapid synthetic approach (within fractions of a second) facilitating ease of scale-up industrialization as well as offering materials with superior properties. The synthesised NCQDs readily disperse in aqueous solution, have an average particle size of 3.3 +/- 0.7 nm, with highest emission intensity at 441 nm (and a narrow full width at half maximum, FWHM similar to 78 nm) under a 360 nm excitation wavelength. N-doped carbon quantum dots, without any further modification, exhibited a high selectivity and sensitivity as a nano-sensor for the highly toxic and carcinogenic chromium(vi) ions. The nano-chemo-sensor delivers significant advantages including simplicity of manufacturing via a continuous, cleaner technology (using targeted biomass precursor), high selectivity, sensitivity and fast response leading to potential applications in environmental industry as well photovoltaics, bio-tagging, bio-sensing and beyond.
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