High-Performance Quenchometric Oxygen Sensors Based on Fluorinated Xerogels Doped with [Ru(dpp)<sub>3</sub>]<sup>2+</sup>

Bukowski, Rachel M.; Ciriminna, Rosaria; Pagliaro, Mario; Bright, Frank V.

doi:10.1021/ac048199b

Cited by 124 publications

(94 citation statements)

References 18 publications

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“…Highly O 2 sensitive sensor materials composed of fluorinated sol-gel precursors mixed with alkyl-modified silanes were also investigated [73,74]. Linear Stern-Volmer plots over the full O 2 concentration range have been demonstrated.…”

Section: Luminescence-based O 2 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 O 2 Sensorsmentioning

confidence: 99%

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

2016

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“…Adopting a similar approach to that used by Bukowski et al, 23 a composite precursor solution was prepared by mixing TFP-TriMOS (1.5 mL) and n-propyl-TriMOS (0.69 mL). Then EtOH (1.5 mL), deionized water (0.635 mL) and HCl (0.08 mL of 0.1 M HCl) were added to the sol solution to catalyze the ORMOSIL reaction.…”

Section: Preparation Of An Optical Ber Probementioning

confidence: 99%

“…The uorinated ORMOSIL is a newly developed material in recent years and have been applied in several sensing applications. 23,[40][41][42] In this work, hybrid uori-nated ORMOSILs based on 3,3,3-triuoropropyltrimethoxysilane (TFP-TriMOS) and n-propyltrimethoxysilane (n-propyl-TriMOS) were chosen to prepare the supporting matrix and immobilize O 2 -sensitive uorophores.…”

Section: Optimization Of Conditionsmentioning

confidence: 99%

An integrated micro-volume fiber-optic sensor for oxygen determination in exhaled breath based on iridium(iii) complexes immobilized in fluorinated xerogels

Xiong

et al. 2013

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A novel integrated fiber-optic sensor with micro detection volume is developed and evaluated for O 2 determination on a breath-by-breath basis in human health monitoring applications. The sensing element was fabricated by dip-coating an uncladded optical fiber with [Ir(piq) 2 (acac)]-doped hybrid fluorinated ORMOSIL (organically modified silicate) film, which was prepared from 3,3,3-trifluoropropyltrimethoxysilane (TFP-TriMOS) and n-propyltrimethoxysilane (n-propyl-TriMOS). The sensor was then constructed by inserting the prepared optical fiber into a transparent capillary. A microchannel formed between the optical fiber and the capillary inner wall acted as a flow cell for the sample flowing through. The evanescent wave (EW) field produced on the fiber core surface can excite the O 2 -sensitive fluorophores of [Ir(piq) 2 (acac)] to produce emission fluorescence. O 2 can be sensed by its quenching effect on the emission fluorescence intensity. Spectroscopic properties have been characterized by FTIR and fluorescence measurements. Stern-Volmer and Demas models were both employed to analyse the sensor sensitivity, which is 13.0 with the LOD ¼ 0.009% (3s) and the response time is about 1 s. By integrating the sensing and detection elements on the optical fiber, the novel configuration showed advantages of easy fabrication and low cost. Parameters of sensitivity, response time, repeatability, humidity effect and temperature effect were discussed in detail. The proposed sensor showed potential for practical in-breath O 2 analysis application due to its advantages of easy fabrication, low cost, fast response, excellent hydrophobicity, negligible temperature interference and suitable sensitivity.

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“…[21] Another recent publication reports quenching ratios of ~35 and linear Stern-Volmer calibration plots from a 67 mol% (3,3,3-triflouropropyl)trimethoxysilane (TFP-tMOS) in propyltrimethoxysilane (PtMOS) sol-gel system. [22] The fluorinated sol-gel system may prove interesting in aqueous dissolved oxygen sensing. Figure 48 shows examples of these two sol-gel systems as applied to potassium cluster lumophores.…”

Section: Measurement Of Mo 6 CL 12 Luminescence As a Function Of Tempmentioning

confidence: 99%

Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants

Baker¹,

Ghosh²,

Osborn³

et al. 2006

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A reflection mode fiber optic oxygen sensor that can operate at high temperatures for power plant applications has been developed. The sensor is based on the 3 O 2 quenching of the red emission from hexanuclear molybdenum chloride clusters. We report on a fiber optic technique for detection of gas phase oxygen up to 100 °C based on the 3 O 2 quenching of the luminescence from molybdenum chloride clusters, K 2 Mo 6 Cl 14 . The inorganic sensing film is a composite of sol-gel particles embedded in a thin, oxygen permeable sol-gel binder. The particles are comprised of thermally stable, luminescent K 2 Mo 6 Cl 14 clusters dispersed in a fully equilibrated sol-gel matrix. From 40 to 100 °C, the fiber sensor switches ~6× in intensity in response to alternating pulses of <0.001% O 2 and 21% O 2 between two well defined levels with a response time of 10 s. The sensor signal is a few nW for an input pump power of 250 µW. The normalized sensor signal is linear with molar oxygen concentration and fits the theoretical Stern-Volmer relationship. Although the sensitivity decreases with temperature, sensitivity at 100 °C is 160 [O 2 ] -1 . These parameters are well suited for in-situ, real-time monitoring of oxygen for industrial process control applications. . Both spectra were taken in a 0.001% oxygen environment. (10×) showing a sol-gel monolith containing MM-5 pulverized using a mortar and pestle, 25 -250 µm particle size, (b) a sol-gel monolith (no clusters), 1 -2 µm particle size, and (c) dark field image (100×) showing a sol-gel monolith containing MM-5 pulverized via ball milling, 2 -8 µm particle size. . Typical results for simultaneous dip-coating 5 1000 µm diameter fibers with particle / sol-gel binder blends. Image A shows an uncoated fiber for reference. Images B -D are fibers were coated with a mixture of 53 w/w% wlb29 powder in 55 mol% OtMOS/TEOS binder. 67Figure 50. Images of fibers coated with 53 w/w% wlb29 powder in 55 mol% OtMOS/TEOS binder before and after mechanical testing. A and B are the before and after images of a fiber tested at 30°; C and D are the before and after images 689 from a second fiber tested at 90°. Images E-H are from a single fiber. Image E shows the fiber before testing, and F, G, and H show results after impacting from 30°, 60° and 90º, respectively. Figure 51. Room temperature emission spectra sol-gel film 29L (◇) 1 day curing at 70°C, (◆) 54 hours of thermal cycling between 200 °C, and the spectrum of its originating potassium salt FJ-17 (□) in CH 3 CN. All spectra were measured and in 99.999% nitrogen. The film concentration is 3.6 ± 1.6 x10 21 cluster/cm 3 based on an estimated film thickness of 700 ± 300 nm. The solution concentration is 0.087 mM ± 1.4%. 71Figure 53. Thermal dependence of the emission spectra for film 38Q cured at 200 °C for 30 minutes. The emission intensity is a function of temperature, but the lineshape is temperature independent. All spectra were sampled in 99.999% nitrogen environments. The cluster source was MM8 and the film concentration is ...

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High-Performance Quenchometric Oxygen Sensors Based on Fluorinated Xerogels Doped with [Ru(dpp)₃]²⁺

Cited by 124 publications

References 18 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)

An integrated micro-volume fiber-optic sensor for oxygen determination in exhaled breath based on iridium(iii) complexes immobilized in fluorinated xerogels

Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants

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High-Performance Quenchometric Oxygen Sensors Based on Fluorinated Xerogels Doped with [Ru(dpp)3]2+

Cited by 124 publications

References 18 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)

An integrated micro-volume fiber-optic sensor for oxygen determination in exhaled breath based on iridium(iii) complexes immobilized in fluorinated xerogels

Fiber Optical Micro-detectors for Oxygen Sensing in Power Plants

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High-Performance Quenchometric Oxygen Sensors Based on Fluorinated Xerogels Doped with [Ru(dpp)₃]²⁺