MSA  Vol.10 No.7 , July 2019
Investigation on the Ammonia Sensitivity Mechanism of Conducting Polymer Polypyrroles Using In-Situ FT-IR
Abstract: Ammonia is toxic, colorless, and harmful to human health. It is important to detect ammonia effectively by gas sensors. In this paper, the mechanism of ammonia sensing on polypyrroles (PPy) films at room temperature has been investigated using a real-time, in-situ Fourier-transform infrared (FT-IR) spectroscopy. The introduction of ammonia results in a structural transformation of PPy films, which is confirmed by FT-IR spectrums. The structure and morphology of the products after the reaction between ammonia and PPy were investigated in detail by FT-IR spectrum and scanning electron microscope (SEM). It was found that the morphology of PPy films was changed to some degree after the reaction. Our results demonstrate that FT-IR spectroscopy is an extremely suitable technique for the characterization of the specific reaction between PPy and ammonia, since it allows monitoring the reaction at room temperature in real time. After the reaction between PPy and ammonia, the concentration of the carrier increases, and the resistance of PPy films decreases, indicating the sensitivity of detection of ammonia.
Cite this paper: Wang, L. and Jiang, R. (2019) Investigation on the Ammonia Sensitivity Mechanism of Conducting Polymer Polypyrroles Using In-Situ FT-IR. Materials Sciences and Applications, 10, 497-508. doi: 10.4236/msa.2019.107036.

[1]   Zhang, D., Liu, J., Jiang, C. Liu, A. and Xia, B. (2017) Quantitative Detection of Formaldehyde and Ammonia Gas via Metal Oxide-Modifified Graphene-Based Sensor Array Combining with Neural Network Model. Sensors and Actuators B: Chemical, 240, 55-65.

[2]   An, K.H., Jeong, S.Y., Hwang, H.R. and Lee, Y.H. (2010) Enhanced Sensitivity of a Gas Sensor Incorporating Single-Walled Carbon Nanotube-Polypyrrole Nanocomposites. Advanced Materials, 16, 1005-1009.

[3]   Basavaraja, C., Kim, W.J., Thinh, P.X. and Huh, D.S. (2011) Electrical Conductivity Studies on Water-Soluble Polypyrrole-Graphene Oxide Composites. Polymer Composites, 32, 2076-2083.

[4]   Bora, C. and Dolui, S.K. (2012) Fabrication of Polypyrrole/Graphene Oxide Nanocomposites by Liquid/Liquid Interfacial Polymerization and Evaluation of Their Optical, Electrical and Electrochemical Properties. Polymer, 53, 923-932.

[5]   Joshi, A., Gangal, S.A. and Gupta, S.K. (2011) Ammonia Sensing Properties of Polypyrrole Thin Films at Room Temperature. Sensors and Actuators B: Chemical, 156, 938-942.

[6]   Xiang, C., Jiang, D., Zou, Y., Chu, H., Qiu, S., Zhang, H., Xu, F., Sun, L. and Zheng, L. (2015) Ammonia Sensor Based on Polypyrrole-Graphene Nanocomposite Decorated with Titania Nanoparticles. Ceramics International, 41, 6432-6438.

[7]   Nalage, S.R., Navale, S.T., Mane, R.S., Naushad, M., Stadlar, F.J. and Patil, V.B. (2015) Preparation of Camphor-Sulfonic Acid Doped PPy-NiO Hybrid Nanocomposite for Detection of Toxic Nitrogen Dioxide. Synthetic Metals, 209, 426-433.

[8]   Mane, A.T., Navale, S.T. and Patil, V.B. (2015) Room Temperature NO2 Gas Sensing Properties of DBSA Doped PPy-WO3 Hybrid Nanocomposite Sensor. Organic Electronics, 19, 15-25.

[9]   Zhang, D., Jiang, C., Li, P. and Sun, Y. (2017) Layerby-Layer Self-Assembly of Co3O4 Nanorod-Decorated MoS2 Nanosheet-Based Nanocomposite toward High-Performance Ammonia Detection. ACS Applied Materials & Interfaces, 9, 6462-6471.

[10]   Jun, J., Lee, J.S., Shin, D.H., Oh, J., Kim, W., Na, W. and Jang, J. (2017) Fabrication of a One Dimensional Tube-in-Tube Polypyrrole/Tin Oxide Structure for Highly Sensitive DMMP Sensor Applications. Journal of Materials Chemistry A, 5, 17335- 17340.

[11]   Malkeshi, H. and Moghaddam, H.M. (2016) Ammonia Gas-Sensing Based on Polythiophene Film Prepared through Electrophoretic Deposition Method. Journal of Polymer Research, 23, 108.

[12]   Qin, Y., Cui, Z., Zhang, T. and Liu, D. (2018) Polypyrrole Shell (Nanoparticles)- Functionalized Silicon Nanowires Array with Enhanced NH3-Sensing Response. Sensors and Actuators B: Chemical, 258, 246-254.

[13]   Muthusamy, S., Charles, J., Sastikumar, D. and Renganathan, B. (2018) In Situ Growth of Prussian Blue Nanocubes on Polypyrrole Nanoparticles: Facile Synthesis, Characterization and Their Application as Fiber Optic Gas Sensor. Journal of Materials Science, 53, 15401-15417.

[14]   Korotcenkov, G. (2007) Metal Oxides for Solid-State Gas Sensors: What Determines Our Choice? Materials Science and Engineering: B, 139, 1-23.

[15]   Xue, M.Q., Li, F.W., Chen, D., Yang, Z.H., Wang, X.W. and Ji, J.H. (2016) High- Oriented Polypyrrole Nanotubes for Next-Generation Gas Sensor. Advanced Materials, 28, 8265-8270.

[16]   Ouajai, W.P., Pigram, P.J. and Jones, R. (2009) A Sensitive and Highly Stable Polypyrrole-Based pH Sensor with Hydroquinone Monosulfonate and Oxalate Co-Doping. Sensors and Actuators B: Chemical, 138, 504.

[17]   Zhang, L., Meng, F.L. and Che, Y. (2009) A Novel Ammonia Sensor Based on High Density, Small Diameter Polypyrrole Nanowire Arrays. Sensors and Actuators B: Chemical, 142, 204.

[18]   Paul, S. and Joseph, M. (2009) Polypyrrole Functionalized with FePcTSA for NO2 Sensor Application. Sensors and Actuators B: Chemical, 140, 439-444.

[19]   Zhang, J., Wang, S.R., Xu, M.J., Wang, Y., Xia, H.J., Zhang, S.M., Guo, X.Z. and Wu, S.H. (2009) Polypyrrole-Coated SnO2 Hollow Spheres and Their Application for Ammonia Sensor. Journal of Physical Chemistry C, 113, 1662-1665.

[20]   Silvestri, S., Dias Ferreira, C., Oliveira, V., et al. (2019) Synthesis of PPy-ZnO Composite Used as Photocatalyst for the Degradation of Diclofenac under Simulated Solar Irradiation. Journal of Photochemistry & Photobiology A: Chemistry, 375, 261-269.

[21]   Yeole, B., Sen, T., Hansora, D.P. and Mishra, S. (2015) Effect of Electrical Properties on Gas Sensitivity of Polypyrrole/CdS Nanocomposites. Journal of Applied Polymer Science, 132, Article ID: 42379.

[22]   Wang, Y., Jia, W.Z. and Strout, T. (2009) Ammonia Gas Sensor Using Polypyrrole-Coated TiO2/ZnO Nanofibers. Electroanalysis, 21, 1432-1438.

[23]   Mane, A.T., Navale, S.T., Sen, S., Aswal, D.K., Gupta, S.K. and Patil, V.B. (2015) Nitrogen Dioxide (NO2) Sensing Performance of p-Polypyrrole/n-Tungsten Oxide Hybrid Nanocomposites at Room Temperature. Organic Electronics, 16, 195-204.

[24]   Lv, Y.-R., He, H.-W., et al. (2019) Polyphenylene Sulfifide (PPS) Fibrous Felt Coated with Conductive Polyaniline via in Situ Polymerization for Smart High Temperature Bag-Filter. Materials Research Express, 6, Article ID: 075706.

[25]   Sahiner, N. and Demirci, S. (2019) The Use of Covalent Organic Frameworks as Template for Conductive Polymer Synthesis and Their Sensor Applications. Journal of Porous Materials, 26, 481-492.

[26]   Qiang, F., Dai, S.-W., Zhao, L., Gong, L.-X., et al. (2019) An Insulating Second Filler Tuning Porous Conductive Composites for Highly Sensitive and Fast Responsive Organic Vapor Sensor. Sensors and Actuators B: Chemical, 285, 254-263.

[27]   Chatterjee, S.G., Chatterjee, S., Ray, A.K. and Chakraborty, A.K. (2015) Graphene—Metal Oxide Nanohybrids for Toxic Gas Sensor: A Review. Sensors and Actuators B: Chemical, 221, 1170-1181.

[28]   Varghese, S.S., Lonkar, S., Singh, K.K., Swaminathan, S. and Abdala, A. (2015) Recent Advances in Graphene Based Gas Sensors. Sensors and Actuators B: Chemical, 218, 160-183.

[29]   Carquigny, S., Sanchez, J.B. and Berger, F. (2009) Ammonia Gas Sensor Based on Electrosynthesized Polypyrrole Films. Talanta, 78, 199-206.

[30]   Lewenstam, A. and Ivaska, A. (1996) A Polypyrrole-Based Amperometric Ammonia Sensor. Talanta, 43,125-134.