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Vol. 146, No. 11, November 2012, pp. 28-35




In-Situ Decoration of Electrostatically Functionalized Multiwalled Carbon Nanotubes with β-Ni(OH)2 Nanoparticles
for Low Temperature NO2 Detection

a Richa SAGGAR, a* Vasuda BHATIA, a Prashant SHUKLA, a Nitin BHARDWAJ, a Vinod K JAIN

a Amity Institute of Advanced Research and Studies-M&D, Amity University,

Noida 201303, India

Tel.: +91-120-4392-2189, fax: +91-120-4392-2289

E-mail: vbhatia@amity.edu


Received: 12 October 2012   /Accepted: 23November 2012   /Published: 30 November 2012

Digital Sensors and Sensor Sysstems


Abstract: In situ β-Ni(OH)2 nanoparticles (NPs) decorated electrostatically functionalized multiwalled carbon nanotubes (f-MWCNTs) composite was fabricated onto flexible substrates by thermal embedding technique for room temperature detection of NO2 vapors. The MWCNTs were functionalized using electrostatic technique thus introducing hydroxyl functional groups on their surfaces (f-MWCNTs). These bonds were in-situ functionalized with Ni precursors using chemical reduction method hence forming β-Ni(OH)2 nanoparticles functionalized MWCNTs. The decoration of f-MWCNTs with β-Ni(OH)2 nanoparticles was confirmed by transmission electron microscopy (TEM), high resolution TEM, scanning electron microscopy (SEM) and X-ray diffraction techniques. The β-Ni(OH)2 NPs were found to be an average size of 7-10 nm. Thermally embedded films of β-Ni(OH)2 decorated f-MWCNTs achieved a 38 % change in sensitivity at 75 ppm when exposed to NO2 vapors in a two-pole format at room temperature.


Keywords: Functionalized multiwalled carbon nanotubes, β-Ni(OH)2 nanoparticles, Electrostatic functionalization, Room temperature NO2 detection



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