Time-biased square wave differential electrolytic potentiometry for determination of ascorbic acid in a complex matrix at multi-walled carbon nanotubes modified silver electrodes

Abdalghaffar Mohammad Osman, Abdullah Mahmud Abulkibash, Muataz Atieh

Research output: Contribution to journalArticle

Abstract

Carbon nanotubes modified silver electrodes (CNTs/Ag) have been prepared by the catalytic thermal decomposition of ethylene in a chemical vapor deposition reactor. CNTs growth parameters such as ratio of ethylene to hydrogen, temperature and time were optimized, to enhance the electrode functionality for application. The electrode surface was characterized by scanning electron microscopy, transition electron microscopy and Raman spectroscopy. The optimum ethylene to hydrogen (C2H2:H2) ratio, temperature and time were found to be 75:90 sccm, 800 °C, and 20 min respectively. The CNTs/Ag electrodes prepared by this method exhibited well adhesion of the CNTs to the metal surface enabling their use for multiple times. The CNTs/Ag electrodes were successfully applied as indicating system in biased square wave differential electrolytic potentiometry (DEP) for the determination of ascorbic acid in a drug formulation and complex Baobab fruit matrix. CNTs/Ag electrodes showed high performance and durability, and the biased square wave led to enhanced DEP signal and lowered the detection limit for ascorbic acid to less than 25 µM. These promising results open the way for the use of CNTs/Ag electrodes as indicating setup for automated flowing systems like flow injection analysis.

Original languageEnglish
JournalArabian Journal of Chemistry
DOIs
Publication statusAccepted/In press - 1 Jan 2018

Fingerprint

Carbon Nanotubes
Ascorbic acid
Silver
Ascorbic Acid
Carbon nanotubes
Electrodes
Ethylene
Hydrogen
Fruits
Electron microscopy
Raman spectroscopy
Chemical vapor deposition
Durability
Pyrolysis
Adhesion
Metals
Temperature
Scanning electron microscopy
ethylene

Keywords

  • Chemical vapor deposition
  • CNTs modified silver electrode
  • Differential electrolytic potentiometry
  • Time biased square wave

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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title = "Time-biased square wave differential electrolytic potentiometry for determination of ascorbic acid in a complex matrix at multi-walled carbon nanotubes modified silver electrodes",
abstract = "Carbon nanotubes modified silver electrodes (CNTs/Ag) have been prepared by the catalytic thermal decomposition of ethylene in a chemical vapor deposition reactor. CNTs growth parameters such as ratio of ethylene to hydrogen, temperature and time were optimized, to enhance the electrode functionality for application. The electrode surface was characterized by scanning electron microscopy, transition electron microscopy and Raman spectroscopy. The optimum ethylene to hydrogen (C2H2:H2) ratio, temperature and time were found to be 75:90 sccm, 800 °C, and 20 min respectively. The CNTs/Ag electrodes prepared by this method exhibited well adhesion of the CNTs to the metal surface enabling their use for multiple times. The CNTs/Ag electrodes were successfully applied as indicating system in biased square wave differential electrolytic potentiometry (DEP) for the determination of ascorbic acid in a drug formulation and complex Baobab fruit matrix. CNTs/Ag electrodes showed high performance and durability, and the biased square wave led to enhanced DEP signal and lowered the detection limit for ascorbic acid to less than 25 µM. These promising results open the way for the use of CNTs/Ag electrodes as indicating setup for automated flowing systems like flow injection analysis.",
keywords = "Chemical vapor deposition, CNTs modified silver electrode, Differential electrolytic potentiometry, Time biased square wave",
author = "Osman, {Abdalghaffar Mohammad} and Abulkibash, {Abdullah Mahmud} and Muataz Atieh",
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AU - Osman, Abdalghaffar Mohammad

AU - Abulkibash, Abdullah Mahmud

AU - Atieh, Muataz

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AB - Carbon nanotubes modified silver electrodes (CNTs/Ag) have been prepared by the catalytic thermal decomposition of ethylene in a chemical vapor deposition reactor. CNTs growth parameters such as ratio of ethylene to hydrogen, temperature and time were optimized, to enhance the electrode functionality for application. The electrode surface was characterized by scanning electron microscopy, transition electron microscopy and Raman spectroscopy. The optimum ethylene to hydrogen (C2H2:H2) ratio, temperature and time were found to be 75:90 sccm, 800 °C, and 20 min respectively. The CNTs/Ag electrodes prepared by this method exhibited well adhesion of the CNTs to the metal surface enabling their use for multiple times. The CNTs/Ag electrodes were successfully applied as indicating system in biased square wave differential electrolytic potentiometry (DEP) for the determination of ascorbic acid in a drug formulation and complex Baobab fruit matrix. CNTs/Ag electrodes showed high performance and durability, and the biased square wave led to enhanced DEP signal and lowered the detection limit for ascorbic acid to less than 25 µM. These promising results open the way for the use of CNTs/Ag electrodes as indicating setup for automated flowing systems like flow injection analysis.

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