Swelling of PDMS networks in solvent vapours; applications for passive RFID wireless sensors

Rumens, C. V.; Ziai, Mohamed A.; Belsey, Kate E.; Batchelor, John C.; Holder, Simon J.

doi:10.1039/c5tc01927c

Cited by 108 publications

(67 citation statements)

References 33 publications

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“…In addition, the swelling ratio is dependent on the solvent vapor exposure time [31]. Therefore, the repeatability of the proposed sensor is experimentally demonstrated by sequentially injecting, extracting and drying it five times.…”

Section: Experimental Demonstrationmentioning

confidence: 99%

Microwave Chemical Sensor Using Substrate-Integrated-Waveguide Cavity

Memon

Lim

2016

Sensors

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This research proposes a substrate-integrated waveguide (SIW) cavity sensor to detect several chemicals using the millimeter-wave frequency range. The frequency response of the presented SIW sensor is switched by filling a very small quantity of chemical inside of the fluidic channel, which also causes a difference in the effective permittivity. The fluidic channel on this structure is either empty or filled with a chemical; when it is empty the structure resonates at 17.08 GHz. There is always a different resonant frequency when any chemical is injected into the fluidic channel. The maximum amount of chemical after injection is held in the center of the SIW structure, which has the maximum magnitude of the electric field distribution. Thus, the objective of sensing chemicals in this research is achieved by perturbing the electric fields of the SIW structure.

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Section: Experimental Demonstrationmentioning

confidence: 99%

Microwave Chemical Sensor Using Substrate-Integrated-Waveguide Cavity

Memon

Lim

2016

Sensors

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“…This can lead to a mechanical collapse or the sagging of the stamp structures during the printing process that result in irregular shapes and patterns [11]. Another disadvantage negatively influencing the performance of PDMS is the shrinkage of approximately 1% upon curing and swelling by solvents such as hexane, diethyl ether, and toluene [12,13]. These limitations can preclude the reproducible formation of submicron features [14].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Characterization and Application of Biomolecule Micropatterns on Cyclic Olefin Polymer (COP) Surfaces with Adjustable Contrast

Hager

Haselgrübler²,

Haas³

et al. 2019

Biosensors

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Peptide and protein micropatterns are powerful tools for the investigation of various cellular processes, including protein-protein interactions (PPIs). Within recent years, various approaches for the production of functional surfaces have been developed. Most of these systems use glass as a substrate, which has several drawbacks, including high fragility and costs, especially if implemented for fluorescence microscopy. In addition, conventional fabrication technologies such as microcontact printing (µCP) are frequently used for the transfer of biomolecules to the glass surface. In this case, it is challenging to adjust the biomolecule density. Here, we show that cyclic olefin polymer (COP) foils, with their encouraging properties, including the ease of manufacturing, chemical resistance, biocompatibility, low water absorption, and optical clarity, are a promising alternative to glass substrates for the fabrication of micropatterns. Using a photolithography-based approach, we generated streptavidin/biotinylated antibody patterns on COPs with the possibility of adjusting the pattern contrast by varying plasma activation parameters. Our experimental setup was finally successfully implemented for the analysis of PPIs in the membranes of live cells via total internal reflection fluorescence (TIRF) microscopy.

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“…Prior approaches to sensitizing RFID tags have involved incorporating sensing materials [19] but these are often purpose designed platforms for the particular material. Here, using polydimethylsiloxane (PDMS) film deposition [20], we repurpose an existing commercial, low cost moisture sensing tag, allowing for the sensing of the change in dielectric constant of various liquids over multiple repetitions.…”

Section: Introductionmentioning

confidence: 99%

A Passive UHF RFID Dielectric Sensor for Aqueous Electrolytes

et al. 2019

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The one-step modification of a commercial RFID sensing tag is demonstrated using polydimethylsiloxane-based thin-film chemistry to construct reusable passive RFID sensors for changes in the dielectric properties of electrolyte solutions as a function of concentration. The effects of PDMS film thickness were characterized as a function of RFID sensor code value. The output sensor code of the RFMicron RFM2100-AER wireless flexible moisture sensor (taken between 800 and 860 MHz) was compared with the readings taken when the tag was dry and when the tag had a water deposition on the sensor area. The effect of the direct application of liquid water on the tag was to alter the capacitance presented to the integrated chip which autotunes to correct for the reactance. By varying the thickness of the PDMS film between the interdigitated sensor and deposited liquid, the sensitivity of the tag to a high dielectric medium could be controlled. Aqueous salt solutions were tested on a 500µm-thick film. It was found that the sensing platform could be used as a means of measuring the concentration of various salt solutions within the range 0-2 M and in turn could be used as a passive UHF RFID dielectric measuring tool. The measurement capability of the platform was subsequently demonstrated using a reduced frequency range (845-865 MHz).Index Terms-Radio frequency identification, RFID tags, chemical sensor, aqueous electrolyte.

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Swelling of PDMS networks in solvent vapours; applications for passive RFID wireless sensors

Abstract: The swelling ratio of a network polydimethylsiloxane correlates with the Hansen solubility parameters, δd, δp and δh and the vapour pressures of organic vapours. The use of PDMS as a mechanical actuator in a prototype wireless RFID passive sensor is demonstrated.

Cited by 108 publications

References 33 publications

Microwave Chemical Sensor Using Substrate-Integrated-Waveguide Cavity

Microwave Chemical Sensor Using Substrate-Integrated-Waveguide Cavity

Fabrication, Characterization and Application of Biomolecule Micropatterns on Cyclic Olefin Polymer (COP) Surfaces with Adjustable Contrast

A Passive UHF RFID Dielectric Sensor for Aqueous Electrolytes

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