Microwave-assisted synthesis of nitrogen, phosphorus-doped Ti3C2 MXene quantum dots for colorimetric/fluorometric dual-modal nitrite assay with a portable smartphone platform

Engineering an Enzymatic Cascade Catalytic Smartphone-Based Sensor for Onsite Visual Ratiometric Fluorescence–Colorimetric Dual-Mode Detection of Methyl Mercaptan

“…In addition, considering the advantages of the dual-mode detection strategy, some efforts have also been devoted to the development of ratiometric fluorescence-based dual-mode assays for the successful detection in complicated samples, showing a great application potential. 33,34 However, in these regards, due to the lack of effective chromophores, the development of CH 3 SH-responsive fluorescence groups seems to have been alarmingly challenged, failing to achieve its onsite visual ratiometric fluorescence-based dual-mode monitoring so far.…”

Towards hospital-on-chip supported by 2D MXenes-based 5th generation intelligent biosensors

“… Li et al, 2021 ) 2019-nCoV 1-10 pgmL −1 1FG mL −1 Ratio-metric (Colorimetric) Glutathione (GSH)–MXene QD composite UA 125 × 10−9 M Liu et al, (2020) Colorimetric MXene/CuS nanocomposite cholesterol 1.9 × 10 −6 M (Y. Li et al, 2019 ) Colorimetric MXene/NiFe nanoflake composite GSH 0.9–30 × 10 −6 M 84 × 10 −9 M (H. Li et al, 2020 ) Colorimetric/flurometric N, P–Ti 3 C 2 MXene quantum dots Recognition of NO 2 1.5–80 μM 0.71 μM Bai et al, (2022) Colorimetric Au/Pt/Ti 3 C 2 Cl 2 nanoflakes Hydrogen peroxide (H2O2) Glutathione (GSH) 50–10000 μM 10.24 μM Xi et al, (2022) 0.1–20 μM 0.07 μM ECL MXene-aptamer nanoprobes MXene adsorbed exosome-cultured AuNP/PNIPAM/GCE Breast cancer cell (MCF-7) 500–5000000particles per μL ∼125particles per μL (H. Zhang et al, 2019 ) ECL MXene/tris (4,4′-dicarboxyl-2,2′-bipyridine) ruthenium (II) ion (Ru (dcbpy) 3 2+ ) (an organic dye)/black phosphorus QD <...…”

“…Due to surface and quantum confinement effects, MXenes display strong photoluminescence. This attribute can measure biomolecules and execute cell imaging ( Bai et al, 2022 ; Chen et al, 2018 ; Guan et al, 2019 ; Y. Li et al, 2019 ; Liu et al, 2020 ; M. Liu et al, 2019 ; Mannoor et al, 2012 ; Xue et al, 2017 ; Xun et al, 2021 ) This can primarily be ascribed to the discrete energy levels present in the quantum dots based on different two-dimensional materials, wherein excitations can mainly undergo radiative decay.…”

A smartphone-based device for simultaneous measurement of ratiometric fluorescence and absorbance demonstrated by the determination of hypochlorous acid

“…It should be noted that eqn (10) is an approximation because only the first term of the Taylor series in eqn ( 8) is used. Anyway, eqn (10) is also helpful to explain the near-linear correlations between the light intensity or hue of the colorimetric images and concentration of target analytes in visible regions, [37][38][39][40][41][42][43][44][45] which are also due to the non-linear response of the CCD in the camera to light intensity (eqn (3)). But the value of G 3 is dependent on the values of G 1 and G 30 .…”