Portable visual assay of Bacillus anthracis biomarker based on ligand-functionalized dual-emission lanthanide metal-organic frameworks and smartphone-integrated mini-device

Notably Stable Bifunctional Europium-Centered Metal–Organic Framework for Instant Sensing of Uric Acid and 1-Hydroxypyrene in Human Urine

“…Besides, the peak of O 1s of the hydroxy-oxygen atoms in 1-HP at 533.02 eV disappears in the spectrum of 1-HP@ 1 . Meanwhile, the peak of O 1s (531.33 eV) in 1-HP@ 1 undergoes a slight shift compared with that in 1 (531.30 eV) (Figure S11c), indicating the presence of coordination between −OH groups of 1-HP and Eu 3+ ions in compound 1 . , For UA, the binding energy of Eu 3+ increases from 1134.63 and 1164.70 eV to 134.90 and 1164.90 eV (Figure S11b), and the peak of O 1s of coordination oxygen atom shifts from 531.30 to 531.46 eV after sensing UA (Figure S11d), indicating that an interaction between Eu 3+ and UA also exists. , Then, luminescent lifetimes of compound 1 with and without 1-HP or UA were further measured. Figure a shows that the lifetime of compound 1 decreases from 0.63 to 0.23 ms for 1-HP and 0.37 ms for UA, indicating that the dynamic quenching mechanism is responsible for the luminescence-quenching phenomenon .…”

“…61,62 For UA, the binding energy of Eu 3+ increases from 1134.63 and 1164.70 eV to 134.90 and 1164.90 eV (Figure S11b), and the peak of O 1s of coordination oxygen atom shifts from 531.30 to 531.46 eV after sensing UA (Figure S11d), indicating that an interaction between Eu 3+ and UA also exists. 61,62 Then, luminescent lifetimes of compound 1 with and without 1-HP or UA were further measured. Figure 9a shows that the lifetime of compound 1 decreases from 0.63 to 0.23 ms for 1-HP and 0.37 ms for UA, indicating that the dynamic quenching mechanism is responsible for the luminescence-quenching phenomenon.…”

“…Meanwhile, the peak of O 1s (531.33 eV) in 1-HP@1 undergoes a slight shift compared with that in 1 (531.30 eV) (Figure S11c), indicating the presence of coordination between −OH groups of 1-HP and Eu 3+ ions in compound 1. 61,62 For UA, the binding energy of Eu 3+ increases from 1134.63 and 1164.70 eV to 134.90 and 1164.90 eV (Figure S11b), and the peak of O 1s of coordination oxygen atom shifts from 531.30 to 531.46 eV after sensing UA (Figure S11d), indicating that an interaction between Eu 3+ and UA also exists. 61,62 Then, luminescent lifetimes of compound 1 with and without 1-HP or UA were further measured.…”

Red-emissive carbon nanostructure-anchored molecularly imprinted Er-BTC MOF: a biosensor for visual anthrax monitoring

“…6 The implementation of advanced sensors plays a crucial role in effectively identifying and responding to the presence of spore-forming bacteria, thereby enhancing the ability to prevent and mitigate the risks associated with germ warfare. 7,8 Optical sensors have gained significant attention in the realm of sensor technology, particularly within different sub-categories that are based on their detection systems. [9][10][11] This is mainly due to their minimal device requirement and, in some cases, no device requirement at all, especially in visual applications.…”

Controllable Synthesis of TbIII Metal–Organic Frameworks with Reversible Luminescence Sensing for Benzaldehyde Vapor

“…Rare-earth-based optical materials with a large Stokes shift, high color purity, and strong luminescence properties have been widely used in optical devices, communication, sensing, and bioimaging. − Among them, lanthanide metal–organic frameworks (Ln-MOFs) have attracted great interest in the field of chemical sensing due to the tailorable luminescence properties and diverse energy-transfer processes derived from their editable components (organic ligands and metal ions/clusters). − Fluorescent signal changes in the sensing process gave high sensitivity and visualization to Ln-MOFs. − Up to now, Ln-MOFs have been used to detect heavy-metal ions or anions, nitroaromatic explosives, volatile organic compounds (VOCs), biomarkers, etc. − Shi’s group synthesized the novel {[Eu 2 (L) 3 (DMF) 2 ]·DMF·MeOH} n (Ln-MOF 1 ; H 2 L = 5-(4 H -1,2,4-triazol-4-yl)­benzene-1,3-dicarboxylic acid, DMF = N , N -dimethylformamide, and MeOH = methanol), which shows the red luminescence characteristic of Eu III . There is a competitive absorption between polychlorinated benzenes and Ln-MOF 1 , which prevents the “antenna effect”.…”