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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2016, Vol. 10 Issue (2) : 265-272    https://doi.org/10.1007/s11705-016-1570-6
RESEARCH ARTICLE
Plasma-enabled sensing of urea and related amides on polyaniline
Harinarayanan Puliyalil1,2,Petr Slobodian3,Michal Sedlacik3,Ruhan Benlikaya4,Pavel Riha5,Kostya (Ken) Ostrikov6,7,8,Uroš Cvelbar1,2,*()
1. Jozef Stefan Institute (F4), Jamova cesta 39, 1000 Ljubjana, Slovenia
2. Jozef Stefan International Postgraduate School, Jamova cesta 39, 1000 Ljubjana, Slovenia
3. Centre of Polymer Systems, University Institute, Tomas Bata University, Trida T. Bati 5678, 76001 Zlin, Czech Republic
4. Department of Secondary Science and Mathematics Education, Faculty of Necatibey Education, Balikesir University, 10100 Balikesir, Turkey
5. Institute of Hydrodynamics, Academy of Sciences, Pod Patankou 5, 166 12 Prague 6, Czech Republic
6. Institute for Future Environments and Institute for Health and Biomedical Innovation, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia
7. CSIRO-QUT Joint Sustainable Materials and Devices Laboratory, Commonwealth Scientific and Industrial Research Organization, New South Wales 2070, Australia
8. School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
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Abstract

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 sensitivity 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 compared to the non-treated PANI. This plasma 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 processing and controlling food quality.

Keywords gas sensing      urea      PANI      amides      plasma     
Corresponding Author(s): Uro? Cvelbar   
Just Accepted Date: 14 April 2016   Online First Date: 03 May 2016    Issue Date: 19 May 2016
 Cite this article:   
Harinarayanan Puliyalil,Petr Slobodian,Michal Sedlacik, et al. Plasma-enabled sensing of urea and related amides on polyaniline[J]. Front. Chem. Sci. Eng., 2016, 10(2): 265-272.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-016-1570-6
https://academic.hep.com.cn/fcse/EN/Y2016/V10/I2/265
Fig.1  Signal response curve for non-treated and plasma treated PANI for urea vapor
Fig.2  Deconvoluted C 1s spectra for non-treated PANI (A) before and (B) after exposing to urea, and plasma treated PANI (C) before and (D) after exposing to urea
Fig.3  Deconvoluted N 1s spectra for non-treated PANI (A) before and (B) after exposing to urea, and plasma treated PANI (C) before and (D) after exposing to urea
Fig.4  FTIR spectra for non-treated and plasma treated PANI samples before and after detection of urea molecules
Fig.5  Schematic view of the sensing mechanism: (A) Non-treated PANI, (B) interaction of the non-treated PANI with urea molecule, (C) plasma functionalized PANI, and (D) plasma functionalized PANI forming ring structure with the urea molecule
Fig.6  Transition cyclic states formed from PANI and other amide molecules: (A) Acrylamide, (B) DMF, and (C) HMPA
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