Jump to main content
Jump to site search


Polypyrrole with a functionalized multi-walled carbon nanotube hybrid nanocomposite: a new and efficient nitrite sensor

Author affiliations

Abstract

This study mainly focuses on the electrochemical-assisted synthesis of conducting polymers such as polypyrrole (PPy) with sodium dodecyl sulfate (SDS) as a surfactant and supported with functionalized multi-walled carbon nanotubes (f-MWCNTs). This nanohybrid composite was used as a nitrite sensor in aqueous medium. The co-deposition of f-MWCNTs into the polymer matrix was studied using scanning electron microscopy, atomic force microscopy and impedance analysis methods. The images obtained from the aforementioned techniques clearly revealed the incorporation of f-MWCNTs into the PPy/SDS matrix. The impedance values of the PPy/SDS/f-MWCNT composite films were found to be lower than those of pure PPy/SDS films. It was also observed that the capacitance of the PPy/SDS/f-MWCNT composite was found to be higher than the capacitance of the PPy/SDS composite. In addition, the capacitance of the composites gradually increased with respect to the increasing percentage of f-MWCNTs (from 0.1 to 0.3). The PPy/SDS/f-MWCNT composite-modified GCE exhibited a sensitive response to the electrochemical oxidation of nitrites. Under optimum conditions, the oxidation peak current of nitrites linearly increased with their concentration in the range from 3 μM to 1120 μM with the system exhibiting a lower detection limit (LOD) of 0.11 μM (110 nM) (S/N = 3). This LOD was much lower than the maximum admissible levels of nitrites in drinking water established by the European Community. Thus, the prepared hybrid composite may be a viable alternative as a highly selective sensor for the detection of nitrite ions present in real water bodies.

Graphical abstract: Polypyrrole with a functionalized multi-walled carbon nanotube hybrid nanocomposite: a new and efficient nitrite sensor

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Oct 2017, accepted on 24 Jan 2018 and first published on 25 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ04130F
Citation: New J. Chem., 2018, Advance Article
  •   Request permissions

    Polypyrrole with a functionalized multi-walled carbon nanotube hybrid nanocomposite: a new and efficient nitrite sensor

    A. D. Arulraj, E. Sundaram, V. S. Vasantha and B. Neppolian, New J. Chem., 2018, Advance Article , DOI: 10.1039/C7NJ04130F

Search articles by author

Spotlight

Advertisements