Diffusion of ammonia gas in PDMS characterized by ATR spectroscopy

Levinský, Petr; Kalvoda, L.; Aubrecht, Jan; Fojtíková, Jaroslava

doi:10.1117/12.2070372

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…The simulations presented in this paper are stimulated by our recent eort to get a closer insight into the structural background of physical properties of PDMS resin [5,6] K-modulus were determined from NPT trajectories according to the formula K = ρ 0 ( dP/ dρ) ρ0 , where ρ 0 is the experimental density at the given T and n. Analogical formula was used in case of the MD data, too.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Poly(dimethylsiloxane) Properties

2015

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Models of poly(dimethylsiloxane) (PDMS) oligomers diering in topology are dened and structure and mechanical properties of these analysed by three dierent theoretical approaches: the Bicerano graph method, atomistic molecular dynamics simulations and mesoscale dissipative particle dynamics. The calculations are performed within the simulation software environment Materials Studio (Accelrys Software Inc.). The obtained values of the Young and bulk modulus are juxtaposed to experimental data available for real PDMS materials and quality of the agreement discussed in relation to the theory level and simulation method applied.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Poly(dimethylsiloxane) Properties

2015

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“…The layers' thickness was checked by the Fresnel fit to the attenuated total reflection (ATR) spectrum containing the minimum corresponding to the resonant surface plasmon polariton (SPP) excitation. The measurements were performed in monochromatic Kretschmann configuration (λ = 633 nm) on our home-made ATR system [14]. Dielectric permittivity value ε = 11.8 + 1.5i was used in a Fresnel fitting procedure for the Au layer.…”

Section: Preparation and Characterization Of Sensing Structuresmentioning

confidence: 99%

“…The PDMS coating covering the nano-grid was then sensitized by soaking the selected organometallic reagent consisting of Co 2+ complex with 5-(4′-dioctylamino-phenylimino)-quinoline-8-one ligands (Co-DPQ) in the PDMS buffer, providing the required sensitivity of the whole sensing structure to ammonia gas. More details about the reagent synthesis, PDMS sensitization procedure, optical properties, and reaction mechanism of the reagent with ammonia gas have been given in our former reports [13,14].…”

Section: Preparation and Characterization Of Sensing Structuresmentioning

confidence: 99%

“…The design of the sensing element presented in this contribution is based on the use of the second of these two options. Specific target gas sensitivity is ensured by the use of organometallic reagent successfully applied in our previous studies dealing with ammonia gas detection by means of sensors based on modified optical fibers [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Fiber Optic Sensor of Ammonia Gas Using Plasmonic Extraordinary Optical Transmission

Kalvoda

Jakoubková

Burda

et al. 2023

Sensors

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While standard surface plasmon resonance (bio) sensing, relaying on propagating surface plasmon polariton sensitivity on homogeneous metal/dielectric boundaries, represents nowadays a routine sensing technique, other alternatives, such as inverse designs with nanostructured plasmonic periodic hole arrays, have been far less studied, especially in the context of gas sensing applications. Here, we present a specific application of such a plasmonic nanostructured array for ammonia gas sensing, based on a combination of fiber optics, extraordinary optical transmission (EOT) effect, and chemo-optical transducer selectively sensitive to ammonia gas. The nanostructured array of holes is drilled in a thin plasmonic gold layer by means of focused ion beam technique. The structure is covered by chemo-optical transducer layer showing selective spectral sensitivity towards gaseous ammonia. Metallic complex of 5-(4′-dialkylamino-phenylimino)-quinoline-8-one dye soaked in polydimethylsiloxane (PDMS) matrix is used in place of the transducer. Spectral transmission of the resulting structure and its changes under exposition to ammonia gas of various concentrations is then interrogated by fiber optics tools. The observed VIS-NIR EOT spectra are juxtaposed to the predictions performed by the rigorous Fourier modal method (FMM), providing useful theoretical feedback to the experimental data, and ammonia gas sensing mechanism of the whole EOT system and its parameters are discussed.

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Colorimetric Gas Sensing Washable Threads for Smart Textiles

Owyeung

Panzer

Sonkusale

2019

Sci Rep

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A fabrication method for a stable entrapment of optically responsive dyes on a thread substrate is proposed to move towards a detection system that can be integrated into clothing. We use the dyes 5,10,15,20-Tetraphenyl-21H,23H-porphine manganese(III) chloride (MnTPP), methyl red (MR), and bromothymol blue (BTB), for a proof-of-concept. Our optical approach utilizes a smartphone to extract and track changes in the red (R), green (G) and blue (B) channel of the acquired images of the thread to detect the presence of an analyte. We demonstrate sensing of 50–1000 ppm of vapors of ammonia and hydrogen chloride, components commonly found in cleaning supplies, fertilizer, and the production of materials, as well as dissolved gas sensing of ammonia. The devices are shown to be stable over time and with agitation in a centrifuge. This is attributed to the unique dual step fabrication process that entraps the dye in a stable manner. The facile fabrication of colorimetric gas sensing washable threads is ideal for the next generation of smart textile and intelligent clothing.

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Diffusion of ammonia gas in PDMS characterized by ATR spectroscopy

Cited by 3 publications

References 5 publications

Molecular Dynamics Simulations of Poly(dimethylsiloxane) Properties

Molecular Dynamics Simulations of Poly(dimethylsiloxane) Properties

Fiber Optic Sensor of Ammonia Gas Using Plasmonic Extraordinary Optical Transmission

Colorimetric Gas Sensing Washable Threads for Smart Textiles

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