Abstract
Multivariate analysis is carried out for single-walled carbon nanotubes (SWNTs) functionalized with a cobalt octaethyl porphyrin (CoOEP) chemiresistive sensor device for selective and simultaneous detection of multiple analytes. The chemiresistor was prepared on Si/SiO2 substrate with photolithographically patterned gold microelectrodes having a 3-µm gap. SWNTs were aligned dielectrophoretically and functionalized with CoOEP by drop-casting. The aligned and CoOEP-functionalized SWNTs were characterized with electrical (I–V method), structural, spectroscopic, and morphological techniques, and sensor performance was investigated in a chemiresistive sensing modality. The fabricated sensor shows response towards acetone, dichloromethane, methyl ethyl ketone, ethanol, and methanol, with a lower detection limit of 5 ppm, which is far below the OSHA permissible exposure limit for each analyte, and demonstrates fast response and recovery. The multivariate analysis viz. principal component analysis and linear discrimination analysis reveals high discriminating capability of SWNTs functionalized with the CoOEP chemiresistive sensor towards these analytes, which could be used as an intelligent electronic nose (E-nose). This type of intelligent E-nose can address the crucial need for monitoring environmental pollution in industries, homes, buildings, etc.
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Acknowledgments
The authors extend their sincere thanks to UGC-DAE CSR (RRCAT), Indore (Project No. CSR-IC-BL66/CRS-183/2016-17/847), Inter University Accelerator Center (IUAC), New Delhi, India (UFR No. 62320), DST-SERB, New Delhi (Project No. EEQ/2017/000645), Rashtriya Uchachatar Shiksha Abhiyan (RUSA), Government of Maharashtra, UGC-SAP Programme (F.530/16/DRS-I/2016 (SAP-II) Dt. 16-04-2016), and DST-FIST (Project No. SR/FST/PSI-210/2016(C) dtd. 16/12/2016) for providing financial support.
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Shirsat, S.M., Bodkhe, G.A., Sonawane, M.M. et al. Multivariate Analysis of a Cobalt Octaethyl Porphyrin-Functionalized SWNT Microsensor Device for Selective and Simultaneous Detection of Multiple Analytes. J. Electron. Mater. 50, 5780–5787 (2021). https://doi.org/10.1007/s11664-021-09111-3
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DOI: https://doi.org/10.1007/s11664-021-09111-3