Optical Chemical Sensors

Biomedical Diagnostics Institute, Dublin City University, Glasnevin, Dublin 9, Ireland.
Chemical Reviews (Impact Factor: 46.57). 03/2008; 108(2):400-22. DOI: 10.1021/cr068102g
Source: PubMed


Optical chemical sensors (OCS) is defined as miniaturized devices that can deliver real time and on-line information on the presence of specific compounds or ions in a complex samples. The most widely used techniques utilized in OCS are optical absorption and luminescence. In yielding analyte information, the OCS employ optical transduction techniques. This review will concentrate on developments in OCS with major emphasis from 2000 to the present day. The recent developments in this field have been driven by factors such as the availability of low-cost, miniature optoelectronic light sources and detectors, the need for multianalyte array-based sensors, specifically in the area of biosensing, advances in microfluidics and imaging technology, and the sensor network, as well as optical materials and components.

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Available from: Brian D Maccraith, Jan 18, 2014
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    • "Optical chemical sensors play an important part in industrial , environmental and clinical monitoring thanks to their low cost, possibility for miniaturization and great flexibility [1], [2]. Among different types of optical chemical sensors, colorimetric sensors are especially attractive because they recognize analytes through color change that allows obtaining the visually observed and easily measurable analytical signal [3], [4]. "
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    ABSTRACT: The paper describes an application of a kind of optical analytical method, digital color analysis (DCA), using colorimetric polymethacrylate sensors (optodes) in order to determine Cr (VI). The optodes are made of optically transparent polymethacrylate matrix (PMM) with 1.5-diphenylcarbazide immobilized. The developed optode can be used in determination of the anlytes using solid-phase spectrophotometry and calculating color coordinates as functions of absorbance spectra. Also color coordinates can be represented as basic color (e.g. RGB) data after the op-tode image digitizing. Then one can determine the content of an analyte in a sample by an appropriate color difference calculated on these coordinates. Experimental results of Cr (VI) determination show that the DCA characteristics of accuracy and precision are comparable with those of the solid phase spectrophotometry.
    XXI IMEKO World Congress “Measurement in Research and Industry”, Prague, Czech Republic; 08/2015
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    • "1 . Due to their low O 2 permeability, PET foils are routinely used as sensor support in planar sensors [19] "
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    ABSTRACT: We describe a low cost optical temperature sensor that is simple to manufacture. The sensor is constructed by simple soaking of paper in a solution of the temperature sensitive luminescent indicator Ru(phen)3 and subsequent lamination of the dried paper. Lamination prevents O2 diffusion to the indicator and thus eliminates O2 cross-sensitivity. The temperature sensitivity was up to −2% change in luminescence lifetime per K, a t90 response time of 10 s. Besides luminescence lifetime based measurements, the sensor is well suited for ratiometric imaging with simple RGB cameras, where the temperature dependent red luminescence can be referenced by the blue luminescence of the optical brightener in the paper.
    Sensors and Actuators B Chemical 04/2015; 210. DOI:10.1016/j.snb.2014.12.102 · 4.10 Impact Factor
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    • "Over the past decade, the synthesis and characterization of hybrid materials based on silica, in which organic dyes were entrapped has attained considerable attention [1] [2]. The use of semiconductor materials for entrapment of the organic fluorophores has been and will remain a very important way to obtain new materials for different applications, including, functional materials in optoelectronic devices, optical sensors [3], optical components like solid state tunable lasers [4] and highly luminescent materials in medicine [5] [6]. "
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    ABSTRACT: A cationic azadioxatriangulenium dye was entrapped in silica thin films obtained by the sol–gel process and in poly (vinyl) alcohol (PVA) thin films. Azadioxatriangulenium is a red emitting fluorophore with a long fluorescence lifetime of ∼20 ns. The fluorescent properties of azadioxatriangulenium in silica thin films and PVA films were studied by means of steady–state and time resolved fluorescence techniques. We have found that the azadioxatriangulenium entrapped in silica thin film has a wider fluorescence lifetime distribution (Lorentzian distribution), lower fluorescence efficiencies, shorter lifetimes compared to Azadioxatriangulenium in a PVA film. The local environment of azadioxatriangulenium molecules in the silica thin film is rich with water and ethanol, which creates the possibility of forming excited state aggregates due to high concentration of dye within a small confined area. In contrast to the PVA matrices, the porous silica films allow restricted rotations of Azadioxatriangulenium molecules, which result in faster and complex fluorescence anisotropy decays suggesting energy migration among dye molecules.
    Dyes and Pigments 02/2015; 117. DOI:10.1016/j.dyepig.2015.01.027 · 3.97 Impact Factor
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