Izvorni znanstveni članak
https://doi.org/10.5599/jese.1134
Development of highly stable conductive multiwalled carbon nanotube ink using covalent and non-covalent functionalization for electrochemical sensors
Ana Elisa Ferreira Oliveira
; Departamento de Ciências Naturais, Universidade Federal de São João del-Rei (UFSJ), Praça Dom Helvécio 74, Fábricas CEP 36301-160, Brazil
Arnaldo César Pereira
; Departamento de Ciências Naturais, Universidade Federal de São João del-Rei (UFSJ), Praça Dom Helvécio 74, Fábricas CEP 36301-160, Brazil
Lucas Franco Ferreira
; Laboratório de Eletroquímica e Nanotecnologia Aplicada, Universidade Federal dos Vales do Jequitinhonha e Mucuri, MGT 367, Km 583, Alto da Jacuba, Diamantina, MG 39100-000, Brazil
Sažetak
The purpose of this work was the fabrication of a conductive carbon nanotube (CNT) ink. The proposed CNT ink remained remarkably stable over several months. The method includes combining the covalent and non-covalent functionalization, resulting in ink that exhibits excellent storage stability. The covalent functionalization was performed in the acid medium using H2SO4and HNO3, while the non-covalent functionalization used sodium dodecyl sulfate(SDS) and ultrasonication. The materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), electro-chemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). FTIR and SEM confirmed that at the non-covalent functionalization, SDS was successfully adsorbed on the f-CNT surface, while at the covalent functionalization, the functional groups (-COOH, C=O and -OH) were inserted into the CNT surface. Voltammetry and EIS indicated that SDS in the presence of functional groups facilitates electron transferby improved electrical conductivity. The final product was a well-dispersed CNT ink with an average ohmic resistance of 18.62 kΩ. This indicates that CNT ink can be used in the fabrication of electrochemical sensors.
Ključne riječi
Carbon materials; printed sensors; conductiveink; electroanalysis; characterization
Hrčak ID:
273101
URI
Datum izdavanja:
24.2.2022.
Posjeta: 626 *