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http://hdl.handle.net/11375/28788
Title: | Multiwalled Carbon Nanotubes Coated with Nitrogen–Sulfur Co-Doped Activated Carbon for Detecting Fenitrothion |
Authors: | Jangid, Krishna Sahu, Rakesh Pandey, Richa Chen, Ri Zhitomirsky, Igor Puri, Ishwar |
Department: | Engineering Physics |
Keywords: | fenitrothion;organophosphates,;square wave voltammetry;carbon nanotube;nitrogen−sulfur doping;activated carbon;nonenzymatic sensor |
Publication Date: | 5-May-2021 |
Publisher: | ACS Applied Nano Materials |
Citation: | 14 |
Abstract: | A nonenzymatic electrochemical sensor is drop casted for sensitive and specific fenitrothion (FT) detection, where a glassy carbon electrode (GCE) is modified by depositing an ink containing nitrogen-sulfur co-doped activated carbon coated multiwalled carbon nanotubes (NS-AC-MWCNT). We provide a method for NS-AC-MWCNT synthesis as follows. First, polypyrrole is coated on multiwalled carbon nanotubes (PPy-MWCNT). Next, the PPy coating is carbonized and chemically activated to enhance specific surface area. The activated carbon coating, co-doped with nitrogen-sulfur improves its surface electrical conductivity and electrocatalytic response as an electrode. Electrochemical impedance spectroscopy (EIS) confirms enhanced charge transfer for the NS-AC-MWCNT/GCE in comparison with MWCNT/GCE and GCE. Scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM) with fast Fourier transform (FFT) elucidate the morphology of the material, and X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy its chemical and structural characteristics. An NS-AC-MWCNT-containing ink is prepared and deposited on a GCE to fabricate a sensor to detect FT. The volume of NS-AC-MWCNT ink deposited, buffer solution pH, accumulation potential Vpp and time tpp, and square wave voltammetry (SWV) parameters are optimized. For 0.05 - 40 µM FT concentrations, the sensor provides a linear current response with a 4.91 nM limit of detection (LOD) with a signal to noise (S/N) ratio of 3. Chemical interferents have negligible influence on FT detection. The sensor detects FT in real lake and tap water samples. |
URI: | http://hdl.handle.net/11375/28788 |
Appears in Collections: | Student Publications (Not Graduate Theses) |
Files in This Item:
File | Description | Size | Format | |
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Jangid ACS ANM 2021.pdf | 6.05 MB | Adobe PDF | View/Open |
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