Direct UV-LED lifetime pH sensor based on a semi-permeable sol–gel membrane immobilized luminescent Eu3+ chelate complex

Turel, Matejka; Čajlaković, Merima; Austin, Ed; Dakin, J.P.; Uray, Georg; Lobnik, Aleksandra

doi:10.1016/j.snb.2007.11.047

Cited by 43 publications

(22 citation statements)

References 43 publications

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“…A TEOS/MTEOS-derived material doped with mercurochrome has been also investigated [120,121]. The dry doped xerogel was fragmented and particles with a diameter in the range of 80-160 μm selected.…”

Section: Luminescence-based Ph Co 2 and Nh 3 Sensorsmentioning

confidence: 99%

Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)

2016

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This review (with 172 references) highlights the progress made in the past 10 years in silica sol-gel-based materials for use in optical chemical sensing. Following an introduction, the processes leading to the sol-gel-based and ormosil materials, their printability and methods for characterisation are discussed. Then various classes of optical sensors, with a focus on sensors for pH values, oxygen, carbon dioxide, ammonia (also in dissolved form), and heavy metal ions are described. A further section covers nanoparticle-based optical sensors mainly for use in intracellular sensing of the above species. Recent developments in this area are also emphasised and future trends discussed.

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Section: Luminescence-based Ph Co 2 and Nh 3 Sensorsmentioning

confidence: 99%

Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)

2016

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“…This "smart" material responds to the species of interest by altering its optical properties (Seitz, 1988;Wolfbeis, 1991). For example, pH is measured optically by immobilizing a pH indicator on a solid support and observing the changes in the absorption or fluorescence of the indicator as the pH of the sample varies with time (Jerónimo et al, 2007;Lobnik, ,2006Turel, 2008;Wolfbeis, 1991).…”

Section: Design Of An Optical Sensormentioning

confidence: 99%

“…The reagent is entrapped in such a matrix and the analyte can diffuse to it. By altering its polarity, the sol-gel matrix makes it possible to sense either ions or gas molecules Lobnik & Čajlaković, 2001;Murković, 2003;Pagliaro, 2009;Turel et al, 2008).…”

Section: Hydrophobic/hydrophilic Polymersmentioning

confidence: 99%

Optical Chemical Sensors:Design and Applications

Lobnik¹,

Turel²,

Urek³

2012

Advances in Chemical Sensors

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“…So far, many approaches have been developed for constructing pH sensors [5][6][7][8][9][10][11][12][13][14][15]. Among these methods, the preparation of fiber optic pH sensors has attracted much research effort.…”

Section: Introductionmentioning

confidence: 99%

“…Though several other fluorescence measurement methods, including lifetime measurement [11,27], ratiometric dual-wavelength measurement [28][29][30], and photoinduced electron transfer (PET) measurement [31] have been developed, fluorescence intensity measurement [32][33][34] is still one of the most widely employed analytical techniques. This is mainly because the intensity measurement has no demand on sophisticated instrumentations, has no lost of spectral information, and generally does not need fluorophore receptor.…”

Section: Introductionmentioning

confidence: 99%

Flow Injection Small-volume Fiber-optic pH Sensor Based on Evanescent Wave Excitation and Fluorescence Determination

Xiong

Huang

et al. 2010

J Fluoresc

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A small-volume fiber-optic pH sensor (FOEWS) based on evanescent wave excitation is developed and evaluated. The sensor is simply fabricated by inserting a decladded optical fiber into a transparent capillary tube. A microchannel between the optical fiber and the capillary inner wall was formed and acted as flow cell for solution flowing through. The pH-sensitive fluorophore of fluorescein can be excited by the evanescent wave field produced on the fiber core surface to produce emission fluorescence. pH value was then sensed by its enhancing effect on the emission fluorescence intensity. The response range of the sensor is from pH 2.09 to pH 8.85 and the linear range is from pH 3.25 to 8.85. The proposed sensor has a small detection volume of 2.5 μL and a short response time of 8 s. It has been applied to measure pH values of real water samples and was in good agreement with the results obtained by commercial pH meter.

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Direct UV-LED lifetime pH sensor based on a semi-permeable sol–gel membrane immobilized luminescent Eu3+ chelate complex

Cited by 43 publications

References 43 publications

Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)

Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)

Optical Chemical Sensors:Design and Applications

Flow Injection Small-volume Fiber-optic pH Sensor Based on Evanescent Wave Excitation and Fluorescence Determination

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