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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


Puni tekst: engleski pdf 2.313 Kb

str. 105-126

preuzimanja: 332

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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

https://hrcak.srce.hr/273101

Datum izdavanja:

24.2.2022.

Posjeta: 1.092 *