Next Article in Journal
Essential Oil Compositions of Three Invasive Conyza Species Collected in Vietnam and Their Larvicidal Activities against Aedes aegypti, Aedes albopictus, and Culex quinquefasciatus
Previous Article in Journal
ATP-Binding and Hydrolysis in Inflammasome Activation
Previous Article in Special Issue
Surface Oxidation of Nano-Silicon as a Method for Cycle Life Enhancement of Li-ion Active Materials
Open AccessArticle

Electrografting of 4-Carboxybenzenediazonium on Glassy Carbon Electrode: The Effect of Concentration on the Formation of Mono and Multilayers

1
Department of Chemistry, Umeå University, SE 90187 Umeå, Sweden
2
Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa
3
Institute for Nanotechnology Innovation Centre, Rhodes University, Grahamstown 6140, South Africa
*
Author to whom correspondence should be addressed.
Academic Editor: R. Daniel Little
Molecules 2020, 25(19), 4575; https://doi.org/10.3390/molecules25194575
Received: 7 September 2020 / Revised: 26 September 2020 / Accepted: 3 October 2020 / Published: 7 October 2020
Grafting of electrodes with diazonium salts using cyclic voltammetry (CV) is a well-established procedure for surface modification. However, little is known about the effect of the concentration of the diazonium salt on the number of layers grafted on the electrode surface. In this work, the impact of concentration on the grafting of 4-carboxybenzenediazonium (4-CBD) onto a glassy carbon electrode (GCE) is elucidated. The number of layers grafted on the GCE was linearly dependent on the concentration of 4-CBD and varied between 0.9 and 4.3 when the concentration was varied between 0.050 and 0.30 mmol/L at 0.10 V.s−1. Characterization of modified glassy carbon surface with X-ray photoelectron spectroscopy (XPS) confirmed the grafting of carboxyphenyl layer on the surface. Grafting with 0.15 mmol/L 4-CBD (1 CV cycle) did not form a detectable amount of carboxyphenyl (CP) moieties at the surface, while a single scan with higher concentration (2.5 mmol/L) or multiple scans (22 cycles) gave detectable signals, indicating formation of multilayers. We also demonstrate the possibility of removing the thin layer grafted on a glassy carbon electrode by applying high oxidation potential +1.40 V. View Full-Text
Keywords: 4-carboxybenzenediazonium tetrafluoroborate; glassy carbon; grafting; cyclic voltammetry; thin films 4-carboxybenzenediazonium tetrafluoroborate; glassy carbon; grafting; cyclic voltammetry; thin films
Show Figures

Graphical abstract

MDPI and ACS Style

Phal, S.; Shimizu, K.; Mwanza, D.; Mashazi, P.; Shchukarev, A.; Tesfalidet, S. Electrografting of 4-Carboxybenzenediazonium on Glassy Carbon Electrode: The Effect of Concentration on the Formation of Mono and Multilayers. Molecules 2020, 25, 4575.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop