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Plasma-enabled sensing of urea and related amides on polyaniline

Frontiers of Chemical Science and Engineering 2016年第2期10卷 265-272页

作者： Harinarayanan Puliyalil petr slobodian Michal Sedlacik Ruhan Benlikaya Pavel Riha Kostya (Ken) Ostrikov Uros Cvelbar Jozef Stefan Institute (F4) Jamova cesta 39 1000 Ljubjana Slovenia Jozef Stefan International Postgraduate School Jamova cesta 39 1000 Ljubjana Slovenia Centre of Polymer Systems University Institute Tomas Bata University Trida T. Bati 5678 76001 Zlin Czech Republic Department of Secondary Science and Mathematics Education Faculty of Necatibey Education Balikesir University 10100 Balikesir Turkey Institute of Hydrodynamics Academy of Sciences Pod Patankou 5 166 12 Prague 6 Czech Republic Institute for Future Environments and Institute for Health and Biomedical Innovation School of ChemistryPhysics and Mechanical Engineering Queensland University of Technology Brisbane Queensland 4000 Australia CSIRO-QUT Joint Sustainable Materials and Devices Laboratory Commonwealth Scientific and Industrial Research Organization New South Wales 2070 Australia School of Physics The University of Sydney Sydney New South Wales 2006 Australia

The atmospheric pressure plasma jet （APPJ） was used to enhance the sensitivity of industrially important polyaniline （PANI） for detection of organic vapors from amides. The gas sensing mechanism of PANI is operating on the basis of reversible protonation or deprotonation, whereas the driving force to improve the sensitivity after plasma modifications is unknown. Herein we manage to solve this problem and investigate the sensing mechanism of atmospheric plasma treated PANI for vapor detection of amides using urea as a model. The results from various analytical techniques indicate that the plausible mechanism responsible for the improved sensi- tivity after plasma treatment is operating through a cyclic transition state formed between the functional groups introduced by plasma treatment and urea. This transition state improved the sensitivity of PANI towards 15 ppm of urea by a factor of 2.4 times PANI. This plasma treated compared to the non-treated PANI is promising for the improvement of the sensitivity and selectivity towards other toxic and carcinogenic amide analytes for gas sensing applications such as improving material proces- sing and controlling food quality.

关键词： gas sensing urea PANI amides plasma

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Synthesis of PMMA-co-PMAA Copolymer Brush on Multi-Wall Carbon Nanotubes

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Journal of Surface Engineered Materials and Advanced Technology 2012年第3期2卷 221-226页

作者： petr slobodian petr Svoboda Pavel Riha Roman Boruta petr Saha Centre of Polymer Systems University Institute Tomas Bata University Zlin Czech Republic Department of Polymer Engineering Faculty of Technology Tomas Bata University Zlin Czech Republic 4Institute of Hydrodynamics Academy of Sciences Prague Czech Republic Institute of Hydrodynamics Academy of Sciences Prague Czech Republic. Polymer Centre Faculty of Technology Tomas Bata University Zlin Czech Republic

Poly(methyl methacrylate)/poly(methacrylamide) copolymer (PMMA-co-PMAA) was synthesized by a free radical copolymerization of MMA and MAA monomers in methylethyl ketone using AIBN as radical initiator. Multi-wall carbon nanotubes (MWCNT) were oxidized in KMnO4 acidic suspension. Carboxyl groups on the surface oxidized MWCNT were reacted with primary amide group of PMMA-co-PMAA copolymer in MEK solution under ultrasound to form polymer brush on the surface of MWCNT. With the help of TG analyses the amount of covalently grafted PMMA-co-PMAA copolymer onto MWCNT surface was determined as ?47 wt%. TEM analyses identified thin co-polymer layer adhered onto MWCNT surface with average thickness ?5 nm.

关键词： Carbon Nanotubes Functionalization PMMA PMAA Polymer brush

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