A facile and label-free ratiometric optical sensor for selective detection of norepinephrine by combining second-order scattering and fluorescence signals

Zeolite-Like Ln-MOF Luminescent Nanosensor for Highly Efficient Detection of l-Noradrenaline

“…We further detected l -NE with 0–15 μM for the study (Figure a–f). In order to investigate the relationship between the concentration of l -NE ([C]) and the luminescence intensity ratio of Eu 0.479 Tb 0.521 -ZMOF ( I 547nm / I 616nm ), there is a good nonlinear relationship between the luminescence intensity ratio of Eu 0.479 Tb 0.521 -ZMOF ( I 54nm / I 616nm ) and [C]. − Using the following equation: I 547nm / I 616nm = 2.91591exp(−0.02702)­[C] + 5.06962 ( R 2 = 0.99), the quenching constant ( K sv ) was calculated to be 2.702 × 10 4 [M] −1 , where LOD was 129 μM.…”

Fluorescence wavelength shifts combined with light scattering for ratiometric sensing of chloride in the serum based on CsPbBr3@SiO2 perovskite nanocrystal composite halide exchanges

“…17,18 Therefore, for size-dependent fluorescent systems that experience fluorescence quenching or enhancement due to decomposition, aggregation, or plasmons, the aforementioned ratiometric platform can be easily realized based on simultaneous fluorescence and scattering intensity responses to the target. 13,[19][20][21][22][23][24] This innovative strategy provides new insights into the applications of fluorescent ratiometric sensors. At the same time, it also causes us to think about whether we can build a fluorescence/scattering wavelength shift-based ratiometric sensing system, which has never been reported before.…”