Reversible and fast responding ppb level Cl2 sensor based on noncovalent modified carbon nanotubes with Hexadecafluorinated copper phthalocyanine

[Display omitted] •Fabrication of highly selective ppb level Cl2 sensors using F16CuPc/CNTs hybrids.•F16CuPc molecules are exo-hedrally attached onto CNTs through π–π stacking.•The detection limit of fabricated Cl2 sensor is up to 0.27 ppb.•Sensors exhibit excellent base line recovery and reversibil...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-02, Vol.255, p.87-99
Main Authors: Sharma, Anshul Kumar, Mahajan, Aman, Saini, Rajan, Bedi, R.K., Kumar, Subodh, Debnath, A.K., Aswal, D.K.
Format: Article
Language:English
Subjects:
Carbon nanotubes
Chlorine sensor
Gas sensing mechanism
Hexadecafluorinated copper phthalocyanine
X-ray photoelectron and impedance spectroscopy
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Summary:[Display omitted] •Fabrication of highly selective ppb level Cl2 sensors using F16CuPc/CNTs hybrids.•F16CuPc molecules are exo-hedrally attached onto CNTs through π–π stacking.•The detection limit of fabricated Cl2 sensor is up to 0.27 ppb.•Sensors exhibit excellent base line recovery and reversibility. Hybrids of hexadecafluorinated copper phthalocyanine (F16CuPc) with carboxylic functionalized single-walled carbon nanotubes (SWCNTs-COOH) and multi-walled carbon nanotubes (MWCNTs-COOH) have been synthesized using a solution assembly method. The resulting hybrid materials have been characterized by Transmission electron microscopy, Raman, UV–vis, X-Ray photoelectron, Fourier-transform infrared spectroscopic techniques and finally studied for gas sensing application. Cl2 selective chemiresistive gas sensors have been fabricated using these hybrids with detection limit up to 0.27ppb. The main characteristics of these sensors are their excellent baseline recovery and reversibility upon repeated exposure to Cl2. F16CuPc/SWCNTs-COOH based sensors showed a gas response as large as 35.82% with a fast response time of 9s towards 2ppm of Cl2. A plausible gas sensing mechanism for charge transfer in hybrids on interacting with Cl2 has been proposed on basis of X-ray photoelectron and impedance spectroscopic studies. These outcomes clearly indicate the great potential of the low cost solution assembly approach for sensor device.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2017.08.013