Ratiometric fluorescence sensor based on carbon quantum dots for visual detection of hypochlorite ions

Lu, Yongju; Wang, Sui; Guo, Zhiyong; Hu, Yufang

doi:10.1007/s11051-021-05388-x

Cited by 3 publications

(1 citation statement)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The composition and functional groups of CDs were studied by XPS. Figure S1a shows the XPS test spectrum, which indicates that the main components of CDs are C, O, N, and S. The XPS spectrum of C 1s in high resolution displayed four distinct peaks at 284.48, 284.80, 285.94, and 287.94 eV (Figure b), which were assigned to C–S, C–C, C–N/C–O, and CO bonds, respectively. − Besides, the high-resolution XPS spectrum of O 1s revealed two characteristic peaks at 530.88 and 531.98 eV (Figure c), and those were attributed to CO and C–O bonds, respectively . The N 1s spectrum exhibited two characteristic peaks at 399.48 and 401.18 eV (Figure d), corresponding to the C–N and N–H bonds, respectively .…”

Section: Resultsmentioning

confidence: 98%

Carbon Quantum Dots for Rapid and Ratiometric Fluorescence Determination of Hypochlorite

Shao,

Guo,

Zhong

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Herein, we present a method for rapid ratiometric fluorescence detection of hypochlorite (ClO − ) by carbon quantum dots (CDs). Glutathione (GSH) was utilized as the starting material for the synthesis of CDs through a hydrothermal process. A maximum fluorescence intensity at an emission wavelength of 435 nm was observed under an excitation wavelength of 335 nm. The inner filter effect (IFE) of curcumin (CCM) on CDs could be utilized to reduce the fluorescence intensity of CDs at 435 nm, while an emission peak emerged at 540 nm. ClO − could rapidly oxidize CCM due to its oxidizing properties, which weakened the IFE, leading to a decrease in the fluorescence intensity of CCM at 540 nm, while the fluorescence intensity of CDs at 435 nm is restored. In addition, CDs exhibited excellent selectivity and sensitivity in the fluorescence detection of ClO − , and a substantial sensitivity in the detection of ClO − was established within a concentration range of 1−1500 μM with a limit of detection of 36.54 nM. The spiked recovery tests of tap water, swimming pool water, and milk samples showed the feasibility of using CDs for the ratiometric fluorescence detection of ClO − in real samples.

show abstract