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In this paper, we present a compact handheld laser-induced fluorescence (LIF) detector based on a 450nm laser diode and quasi-confocal optical configuration with a total size of 9.1×6.2×4.1cm3. Since there are few reports on the use of 450nm laser diode in LIF detection, especially in miniaturized LIF detector, we systematically investigated various optical arrangements suitable for the requirements...
Herein, the facile method with high selectivity for phosphate ion (Pi) sensing using novel Type-II core/shell Mn: ZnTe/ZnSe quantum dots (QDs) was reported. This was the first time that Mn: ZnTe/ZnSe QDs with highlighted optical properties were used for sensing. The water-soluble Mn: ZnTe/ZnSe QDs with a high quantum yield of 7% were synthesized by aqueous synthetic method. Compared with traditional...
The detection of Hg2+ has attracted considerable attention because of the serious health and environmental problems caused by it. Herein, a novel ratiometric fluorescent chemsensor (GQDs–SR) based on the fluorescence resonance energy transfer (FRET) process for detecting of Hg2+ was designed and synthesized with rhodamine derivative covalently linked onto graphene quantum dots. In this sensor, the...
In the present work, a flow injection (FI) “turn off–on” chemiluminescent method was developed for the determination of glutathione (GSH). Strong chemiluminescence (CL) signals were observed from the hydrogen peroxide and CdTe quantum dots (QDs) system under basic condition, addition of trace amount of Cu(Ⅱ) could caused significant CL quenching of the CdTe QDs–H 2 O 2 system. In the...
A dual-function chemosensor for Hg 2+ and Zn 2+ ions, inspired by the green fluorescent protein (GFP) chromophore, was designed and synthesized, which could specifically recognize Zn 2+ through an “OFF–ON” fluorescence mechanism due to the restriction of the free rotation of the aryl–alkene bond, whilst also producing a selective visible colorimetric response from yellow to...
A new sensing molecule 8-hydroxyquinoline ferrocenoate (Fc-Q) which combines ferrocene and 8-hydroxyquinoline moieties was synthesized and applied as a multi-channel sensor for the detection of Hg 2+ ion. Fc-Q can coordinate with Hg 2+ to give colorimetric, fluorescent and electrochemical responses. Upon complexation with Hg 2+ ion, the characteristic absorption peak is red-shifted...
The influence of the bending-induced mechanical stress of flexible Nafion ® /GOx/carbon screen-printed electrodes (SPEs) upon the performance of such glucose biosensors has been examined. Surprisingly, such flexible enzyme/polymer-SPEs operate well following a severe bending-induced mechanical stress (including a 180° pinch), and actually display a substantial sensitivity enhancement following...
The secondary metabolites of different Ephedra plants are various. Therefore, the discrimination of different Ephedra plants is significant. An objective, easy-to-use, rapid and pollution-free approach is proposed for discriminating Ephedra plants of different species, habitats and picking times on the basis of diffuse reflectance Fourier transform near infrared spectroscopy (FT-NIRS) measurements...
Poly(4-vinylpyridine) was crosslinked and quaternized with 1,4-bromobutane to form a polyelectrolyte humidity sensitive film on an interdigitated gold electrode, which was further coated with a layer of polypyrrole by a facile method of vapor phase polymerization. The composite so prepared was characterized by UV–vis spectroscopy and scanning electron microscopy. The investigations on the humidity...
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