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- W2768289646 abstract "Ionic liquids (IL) have been regarded as promising electrolytes as substitutes for volatile aqueous or organic solvents for electrochemical gas sensors. However, ILs are viscous, and the slow diffusion of gas molecules leads to poor sensitivity and sluggish response times. Herein, we describe a strategy using an array of microstrips of IL containing magnetic nanoparticles as nanostirrers for enhanced mass transport and gas sensing. Magnetic CoFe2O4 nanoparticles are synthesized and dispersed in a hydrophobic IL [BMP][Ntf2]. First, the convection effect of the IL dispersion was studied using the reversible redox couple ferrocene/ferrocenium ion. In a rotating magnetic field, steady-state currents for oxidation of dissolved ferrocene are three to five times greater than that in an unstirred solution. Then, the IL dispersion is micropatterned onto a gold electrode using microcontact printing. A self-assembled monolayer was printed onto a gold surface creating 70 μm wide hydrophobic lines with a 30 μm gap between them. Upon applying the IL dispersion into the gap, a 30 μm wide array of microstrips was successfully fabricated. The system is demonstrated as an oxygen sensor in the range of volume fraction of O2 of 50–500 ppm giving a linear calibration with a sensitivity of 1.94 nA cm–2 ppm–1." @default.
- W2768289646 created "2017-12-04" @default.
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- W2768289646 date "2017-11-28" @default.
- W2768289646 modified "2023-10-14" @default.
- W2768289646 title "Ionic Liquid Microstrips Impregnated with Magnetic Nanostirrers for Sensitive Gas Sensors" @default.
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- W2768289646 doi "https://doi.org/10.1021/acsami.7b14657" @default.
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- W2768289646 hasPublicationYear "2017" @default.
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