Topic
Naked eye
About: Naked eye is a research topic. Over the lifetime, 1342 publications have been published within this topic receiving 34880 citations. The topic is also known as: bare eye & unaided eye.
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TL;DR: A simple, convenient, and inexpensive method to quantitatively determine fluoride anion concentration in acetonitrile as well as in water has shown a high selectivity and a great sensitivity toward fluoride anions through "turn-on" chromogenic and fluorogenic dual modes.
Abstract: A simple, convenient, and inexpensive method has been developed to quantitatively determine fluoride anion concentration in acetonitrile as well as in water. The method exhibited a high selectivity and a great sensitivity toward fluoride anions through “turn-on” chromogenic and fluorogenic dual modes. The fluoride driven silyl deprotection and the subsequent spectral changes of hydroxyl coumarin were the operating foundations for the observed selectivity and sensitivity. 1H NMR spectral titration with F– revealed that complete deprotection of a triisopropylsilyl (TIPS) group needed exactly 1 equiv of TBAF. UV–vis and fluorescence titration studies exhibited the appearance of a new intense absorption band centered at 434 nm and green emission peak at 500 nm, accompanied by bright yellow color development to the naked eye. An easy-to-prepare test paper, obtained by dipping the paper into the solution of TIPS-protected coumarin derivative, was able to detect F– in aqueous media. The method has also shown hig...
187 citations
TL;DR: Hg( 2+) is able to inhibit the peroxidase-like DNAzyme function of a T-containing G-quadruplex DNA via Hg(2+)-mediated T-T base pairs, which enables the visual detection of Hg (2+) in the TMB-H(2)O(2), reaction system with high selectivity and sensitivity.
185 citations
TL;DR: A porous Cu(I)-MOF was constructed from CuI and 1-benzimidazolyl-3,5-bis(4-pyridyl)benzene to be a highly sensitive naked-eye colorimetric sensor to successively detect water and formaldehyde species in a single-crystal-to-single-Crystal fashion.
185 citations
TL;DR: A rhodamine based highly selective colorimetric and fluorescent probe for fluoride has been designed and synthesized and has been shown to be feasible for real sample analysis, and imaging of fluoride ions in the HeLa cells.
Abstract: A rhodamine based highly selective colorimetric and fluorescent probe for fluoride has been designed and synthesized. The fluorescent change is attributed to the fluoride triggered spirolactam ring opening which is augmented by density functional theory calculations and 1H NMR titrations. The sensor has been shown to be feasible for real sample analysis, and imaging of fluoride ions in the HeLa cells.
169 citations
TL;DR: In this paper, a novel electrospun fluorescent nanofiberous membrane with a function like molecular wires was developed via electrospinning for the detection of ultra-trace nitro explosive vapors and buried explosives by naked eye under UV excitation.
Abstract: A novel electrospun fluorescent nanofiberous membrane with a function like “molecular wires” was developed via electrospinning for the detection of ultra-trace nitro explosive vapors and buried explosives by naked eye under UV excitation. The high binding affinity between the electron-deficient nitro explosives and the sensing film results in a rapid, dramatic quenching in its fluorescence emission. A wide spectrum of nitro explosives, in particular, TNT, Tetryl, RDX, PETN and HMX could be “visually” detected at their sub-equilibrium vapors (less than 10 ppb, 74 ppt, 5 ppt, 7 ppt and 0.1 ppt, respectively) released from 1 ng explosives residues. Such outstanding sensing performance could be attributed to the proposed “sandwich-like” conformation between pyrene and phenyl pendants of PS which may allow efficient long-range energy migration similar to “molecular wire”, thus achieving amplified fluorescence quenching. Its application for the detection of buried explosives in soil by naked eye was also demonstrated, indicating its potential application for landmine mapping. To the best of our knowledge, this is the first report about the detection of buried explosives without the use of any advanced analytical instrumentation.
167 citations