Non-covalently anchored multi-walled carbon nanotubes with hexa-decafluorinated zinc phthalocyanine as ppb level chemiresistive chlorine sensor

摘要

A cost effective solution assembly method has been explored for preparing zinc(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 (F16ZnPc/MWCNTs-COOH) hybrid. Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, transmission electron microscopy (TEM) and field emission scanning electron microscopy (FE-SEM) investigations confirm the non-covalent anchoring of F16ZnPc onto MWCNTs-COOH through Pi-Pi stacking interactions. Further, a highly sensitive and selective chemiresistive Cl-2 sensor has been fabricated using F16ZnPc/MWCNTs-COOH hybrid. The response of sensor is found to be 21.28% for 2 ppm of Cl-2 with a response time of 14 s and theoretical detection limit of the sensor is found down to 0.06 ppb. The improved Cl-2 sensing characteristics of hybrid are found to be originated from the synergetic interaction between F16ZnPc and MWCNTs-COOH. The underlying mechanism for improved gas sensing performance of F16ZnPc/MWCNTs-COOH sensor towards Cl-2 has been explained using Raman, X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS) studies. (C) 2017 Elsevier B.V. All rights reserved.