Investigation on acid functionalization of double-walled carbon nanotubes of different lengths on the development of amperometric sensors
| Autor: | Edson Nossol, Elson Longo, Eduardo M. Richter, Ariadne C. Catto, Ana P. Lima, Rodrigo A.A. Munoz |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Catechol
General Chemical Engineering chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Amperometry 0104 chemical sciences law.invention chemistry.chemical_compound symbols.namesake chemistry X-ray photoelectron spectroscopy Chemical engineering law Electrode Electrochemistry symbols Surface modification 0210 nano-technology Raman spectroscopy Carbon |
| Zdroj: | Electrochimica Acta. 299:762-771 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2019.01.042 |
| Popis: | Double-walled carbon nanotubes (DWCNTs) of different length were submitted to acid functionalization and investigated as chemical modifiers on glassy-carbon electrode (GCE) for the sensing of dopamine and catechol. Acid functionalization introduced oxygenated groups and defects on the structure of DWCNTs, as detected by infrared, Raman and X-ray photoelectron spectroscopy. However, cyclic voltammetric experiments showed higher current responses on non-functionalized (NF) DWCNTs. The decrease in response was stronger for shorter length nanotubes (S-DWCNT) modified GCE, which was attributed to the reduction of electroactive area of functionalized nanotubes after acid treatment with HNO3/H2SO4. Brunauer-Emmett-Teller (BET) analyses confirmed the decrease in surface area of functionalized (F) DWCNTs, especially on F S-DWCNT. Amperometric measurements also showed decrease in sensitivity and higher detection limit values on the F S-DWCNT, which is also due to the decrease in electroactive area. As conclusion, DWCNT is a potential carbon-based material to the development of highly sensitive amperometric sensors and acid functionalization is not likely required due to the higher surface area provided by modification with the untreated material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect