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Issue 78, 2017, Issue in Progress
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CNTs based improved chlorine sensor from non-covalently anchored multi-walled carbon nanotubes with hexa-decafluorinated cobalt phthalocyanines

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Abstract

To study the effect of synergetic interactions between metal-phthalocyanine and carbon nanotubes for gas sensing characteristics of carbon nanotubes, we synthesized a hybrid of cobalt(II)-1,2,3,4,8,9,10,11,15,16,17,18,22,23,24,25-hexa-decafluoro-29H,31H-phthalocyanine/multi-walled carbon nanotubes (F16CoPc/MWCNTs–COOH). The as-prepared hybrid was characterized through spectroscopic (FT-IR, UV-vis and Raman), electron microscopic (TEM and FE-SEM) and TGA investigations that confirmed the successful non-covalent anchoring of F16CoPc onto MWCNTs–COOH through π–π stacking interactions. Further, a highly reversible, reproducible, sensitive and Cl2 selective chemiresistive sensor was fabricated using F16CoPc/MWCNTs–COOH hybrid, which exhibited a sensitivity of ∼63% for 2 ppm of Cl2 and a limit of detection as low as 0.05 ppb. A plausible gas sensing mechanism for improved gas sensing characteristics of F16CoPc/MWCNTs–COOH sensor towards Cl2 was explained using Raman, X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) studies. Herein, cobalt metal ion is found to play an important role in enhancing gas sensing characteristics of the fabricated sensor.

Graphical abstract: CNTs based improved chlorine sensor from non-covalently anchored multi-walled carbon nanotubes with hexa-decafluorinated cobalt phthalocyanines

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Publication details

The article was received on 14 Aug 2017, accepted on 10 Oct 2017 and first published on 25 Oct 2017


Article type: Paper
DOI: 10.1039/C7RA08987B
Citation: RSC Adv., 2017,7, 49675-49683
  • Open access: Creative Commons BY license
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    CNTs based improved chlorine sensor from non-covalently anchored multi-walled carbon nanotubes with hexa-decafluorinated cobalt phthalocyanines

    A. K. Sharma, A. Mahajan, R. K. Bedi, S. Kumar, A. K. Debnath and D. K. Aswal, RSC Adv., 2017, 7, 49675
    DOI: 10.1039/C7RA08987B

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