Microsystems for optical gas sensing incorporating the solvatochromic dye Nile Red

Liu, Dong; Mills, Christopher A.; Cooper, Jonathan M.

doi:10.1016/s0925-4005(03)00012-1

Cited by 29 publications

(13 citation statements)

References 25 publications

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“…These approaches have been used successfully in chemical analysis and research efforts have continuously been made to improve the accuracy and reliability of the output. [4][5][6] Chemical analysis using array sensing approach mainly includes electrochemical [7][8][9], mass [10,10] and optical sensors [12][13][14][15][16][17][18]. In the electrochemical sensing category a large proportion of the work has been in the area of gas sensing that is based on conductometric techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The mass increase due to analyte being absorbed on the coating causes a frequency shift in the oscillator. Optical sensing using multivariate approach includes the use of fibre optics, [3][4][5] and chemochromic dyes [13,15]. Recent approaches include combining different sensors such as optical and capacitive in an array in an attempt to improve the reliability of the data [25,26].…”

Section: Introductionmentioning

confidence: 99%

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Quantitative colorimetric analysis of dye mixtures using an optical photometer based on LED array

Lau

Yerazunis

Shepherd

et al. 2006

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative colorimetric analysis of dye mixtures using an optical photometer based on LED array

Lau

Yerazunis

Shepherd

et al. 2006

Sensors and Actuators B: Chemical

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“…This blue shift is mainly caused by the highly polar structure of the coumarin dye in the excited state, which shifts the absorption spectrum and hence the fluorescence spectra towards the blue side of the spectrum. Hydrogen bonding has been found to play an important role in the photophysics of the derivatives [6,[8][9][10]. This type of bonding causes a blue shift in fluorescence.…”

Section: Resultsmentioning

confidence: 99%

A Technique for Sensing Organic Compounds Using Fluorescence Maximum Shift In Laser Dyes

Dadge¹,

Thakur²

2017

J Laser Opt Photonics

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A technique that could be used for sensing organic compounds is presented. In ethanol, Rhodamine-6G (a laser dye) was dissolved to obtain a Rhodamine-ethanol (Rh-Eth) solution with the concentration of Rhodamine-6G being 0.005 M. Methanol (0.25 cm 3 ) was added to the Rh-Eth solution and the Rh-Eth-Me solution so obtained was pumped with a nitrogen laser. A blue shift in the fluorescence spectrum of the Rh-Eth-Me was observed as compared to the Rh-Eth solution without methanol. A similar blue shift was observed in the Rh-Eth solution when acetone and acetonitrile were separately added. When Rhodamine-6G and Coumarin460 were added with Polymethyl methacrylate (PMMA) in ethanol, a blue shift was observed in the fluorescence spectrum as compared to the Rh-6G and Cou460 in ethanol without PMMA. The phenomena of spectral shifts in the fluorescence spectrum can be used to sense organic compounds and a mechanism is discussed.

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“…[9] Two major strategies have been adopted to bestow vapochromic properties on materials. One is the immobilization of solvatochromic p-conjugated organic dyes in insoluble polymeric materials, such as sugar gel, [1] mesoporous silica, [2] or poly-(vinylpyrrolidone), [3] in which slight color changes occur upon exposure to organic vapors, by regional aggregation of substituted dye moieties on the "wet" solid surfaces of polymer chains. An alternative strategy is to design porous crystals of organometallic compounds.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Vapochromic Behaviors of Organic Crystals Based on the Open–Close Motions of S‐Shaped Donor–Acceptor Folding Units

Takahashi

Takaya

Naota

2010

Chemistry A European J

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The first vapochromic organic crystals are described with respect to their preparation, color change, adsorption/desorption properties, crystal structures, and color-change mechanism. Non-solvatochromic, 1,4,5,8-naphthalene-tetracarboxylic diimide (NDI) derivatives 1 a bearing two pyrrole imine (PI) tethers have been used as a motif for the crystal packing template. Red-purple vapochromic solid 3 was prepared by evacuation of orange crystals 2 (equivalent to 1 a2 MeOH), obtained by recrystallization of 1 a from MeOH. Solid 3 showed high-adsorption ability and unprecedented vapor-dependent color changes upon exposure to a variety of organic vapors, whereas light brown amorphous solid 1 a, did not show vapo- or solvatochromic behavior toward any organic solvent. The strong adsorption capability of 3 was confirmed by TGA experiments and adsorption/desorption isotherms. Analysis of the solid-state UV/Vis analysis revealed that the vapor-dependent color changes of 3 were owed to the specific interference of solvent vapors with its broad CT absorbance at lambda=450-650 nm. Packing structures of 1 a in orange crystals 2, red-purple solid 3, and regenerated orange solid 2 were unequivocally established by single crystal and synchrotron powder X-ray diffraction, respectively. Molecular structures and arrays of 1 a in these materials indicated that 1) unit 1 a had an S-shaped folded conformation in 2 and 3 by intramolecular donor-acceptor interactions between NDI and two PI units; 2) inclusion of the guest vapor into the S-shaped template decreased the intramolecular PI-NDI interactions, accompanied by increasing intermolecular NDI-NDI and PI-PI interactions; and 3) such flexible, open-close motions of the S-shaped template could be repeated during reversible adsorption/desorption processes without degradation of crystal packing. The adsorption properties and mechanism of molecular shape-dependent vapochromic behavior of 3 are discussed with reference to experimental results, crystallographic data, and theoretical calculations.

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Microsystems for optical gas sensing incorporating the solvatochromic dye Nile Red

Cited by 29 publications

References 25 publications

Quantitative colorimetric analysis of dye mixtures using an optical photometer based on LED array

Quantitative colorimetric analysis of dye mixtures using an optical photometer based on LED array

A Technique for Sensing Organic Compounds Using Fluorescence Maximum Shift In Laser Dyes

Dynamic Vapochromic Behaviors of Organic Crystals Based on the Open–Close Motions of S‐Shaped Donor–Acceptor Folding Units

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