Effect of dispersant on chain formation capability of TiO2 nanoparticles under low frequency electric fields for NO2 gas sensing applications |
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| Affiliation: | 1. Department of Ceramic, Materials and Energy Research Center, Tehran 14155-4777,Iran;2. Faculty of Science, Chemistry Department, University of New South Wales, Sydney, Australia;3. Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Canada;4. XaRMAE/IN2UB, Department of Electronica, Universitat de Barcelona, 08028 Barcelona, Spain;1. Department of Inorganic Chemistry, Institute of Chemical Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic;2. Department of Physical Chemistry, Institute of Chemical Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic;3. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic;1. Department of Physics and Astrophysics, University of Delhi, Delhi110007, India;2. Solid State Physics Laboratory, DRDO, Lucknow Road, Timarpur, Delhi110054, India;1. Thermal Systems Group, ISRO Satellite Centre, Vimanapura Post, Bangalore 560017, India;2. Department of Physics, Sri Venkateswara University, Tirupati 517502, India;3. Mechanical Property Evaluation Section, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India |
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| Abstract: | In this study, the effect of Dolapix CE64 as dispersant on the deposition mechanism and chain formation of TiO2 nanoparticles in the different frequencies under non-uniform AC electric field was investigated. The optical microscope (OM) images of the deposition patterns obtained at the frequency of 1 Hz and 100 Hz in non-aqueous media one containing dispersant and the other being dispersant free revealed that the addition of charge inducing agents (dispersant) has drastically changed deposition mechanism enabling particles to enter the gap leaving the electrodes surfaces uncoated. At 10 kHz, it was observed that by the introduction of Dolapix CE64 the TiO2 nanoparticles were able to form chain-like patterns along the electric field lines bridging the interelectrode gap. The obtained pearl chain formation (PCF) was employed to fabricate an NO2 gas sensor which showed a good response to the target gas at 450, 500 and 550 ˚C. |
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| Keywords: | AC electrophoretic deposition Dispersant Gas sensing |
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