Optical Chemical Sensors

McDonagh, Colette; Burke, Conor S.; MacCraith, Brian D.

doi:10.1021/cr068102g

Cited by 906 publications

(596 citation statements)

References 277 publications

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“…For luminescence O 2 sensing, the sensitivity is mainly determined by the O 2 permeability, the original luminescence lifetime, and the collision radius of the luminescent dye 117, 118, 119, 120. Precious metal (Pt, Ru, Au, Ir, Re, etc.)…”

Section: Radical Gases (O2)mentioning

confidence: 99%

Photoluminescent Metal–Organic Frameworks for Gas Sensing

et al. 2016

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Luminescence of porous coordination polymers (PCPs) or metal–organic frameworks (MOFs) is sensitive to the type and concentration of chemical species in the surrounding environment, because these materials combine the advantages of the highly regular porous structures and various luminescence mechanisms, as well as diversified host‐guest interactions. In the past few years, luminescent MOFs have attracted more and more attention for chemical sensing of gas‐phase analytes, including common gases and vapors of solids/liquids. While liquid‐phase and gas‐phase luminescence sensing by MOFs share similar mechanisms such as host‐guest electron and/or energy transfer, exiplex formation, and guest‐perturbing of excited‐state energy level and radiation pathways, via various types of host‐guest interactions, gas‐phase sensing has its unique advantages and challenges, such as easy utilization of encapsulated guest luminophores and difficulty for accurate measurement of the intensity change. This review summarizes recent progresses by using luminescent MOFs as reusable sensing materials for detection of gases and vapors of solids/liquids especially for O2, highlighting various strategies for improving the sensitivity, selectivity, stability, and accuracy, reducing the materials cost, and developing related devices.

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Section: Radical Gases (O2)mentioning

confidence: 99%

Photoluminescent Metal–Organic Frameworks for Gas Sensing

et al. 2016

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“…Obviously, in this work the LDPE layer provides the same function as the hydrophobic silicone or Teflon layer used previously by others [1,17], i.e. it acts as a gas-permeable, ionimpermeable layer.…”

Section: Detection Of Dissolved Comentioning

confidence: 96%

“…CO 2 in this case) -permeable, ion (i.e. proton and salt in this case)-impermeable layer, such as Teflon [17] or a hydrophobic silicone layer [1]. This layer allows the CO 2 indicator to monitor, without interference from ions in the solution under test, the partial pressure of CO 2 in an aqueous solution over a range of pH values, typically pH 4-8.…”

Section: Detection Of Dissolved Comentioning

confidence: 99%

Highly CO₂sensitive extruded fluorescent plastic indicator film based on HPTS

Mills

Yusufu

2016

Analyst

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Highly-sensitive optical fluorescent extruded plastic films are reported for the detection of gaseous and dissolved CO 2 . The pH-sensitive fluorescent dye used is 8-Hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS, PTS -) coated on the surface of hydrophilic fumed silica and the base is tetrabutylammonium hydroxide (TBAH). The above components are used to create an HPTS pigment (i.e. HPTS/SiO 2 /TBAH) with a high CO 2 sensitivity (%CO 2 (S=1/2) = 0.16%) and fast 50% response (t 50↓ ) = 2 s and recovery (t 50↑ ) = 5 s times. Highly CO 2 -sensitive plastic films are then fabricated, via the extrusion of the HPTS pigment powder in low-density polyethylene (LDPE). As with the HPTS-pigment, the luminescence intensity (at 515 nm) and absorbance (at 475 nm) of the HPTS plastic film decreases as the %CO 2 in the ambient gas phase increases. The HPTS plastic film exhibits a high CO 2 sensitivity, %CO 2 (S=1/2), of 0.29%, but a response time ˂ 2 min and recovery time ˂ 40 min, which is slower than that of the HPTS pigment. The HPTS plastic film is very stable under ambient conditions, (with a shelf life ˃ six month when stored in the dark but under otherwise ambient conditions). Moreover, the HPTS-LDPE film is stable in water, salt solution and even in acid (pH=2), and in each of these media it can be used to detect dissolved CO 2 .

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“…In addition, for optical immunosensors, the application of nanoparticles contributes to the exploration of new optical phenomena and promotes the optical properties of materials [95]. As to electrochemical immunosensors, nanoparticles provide the ability to enhance selectivity and reduce the background current [90,96].…”

Section: Immunosensormentioning

confidence: 99%