Effects of thin-layer diffusion in the electrochemical detection of nicotine on basal plane pyrolytic graphite (BPPG) electrodes modified with layers of multi-walled carbon nanotubes (MWCNT-BPPG)

Multi-walled carbon nanotubes: Size-dependent electrochemistry of phenolic compounds

“…The plots of current of HQ, TBHQ, CT, and DP at the GCE, LD-MWCNT, and SD-MWCNT surfaces in function of the square root of scan rate (in the range of 10 and 1000 mV s À1 ) were highly linear (R > 0.99) and crossed the origin, which indicates that all electrochemical processes were diffusion- controlled (plots not shown). Therefore, no adsorption effects can be inferred in the electrochemical oxidation of the four analytes either of the both MWCNT-modified GCE surfaces considering the conditions of MWCNT-film formation in this work [10][11][12][13]. Fig.…”

“…However, metallic impurities in CNTs can also be responsible for their claimed electrocatalytic properties [8,9]. Another possible explanation for the lowered reduction or oxidation potentials observed in CNTmodified electrodes is the alteration of the mass transport regime from linear (planar) diffusion to thin layer diffusion as the CNTmodified electrode can be considered as a conducting porous layer [10][11][12][13]. Similar behaviour was reported for electrochemical processes on metal-hexacyanoferrate films [14], and evidences of the entrapment of electroactive species within the film were obtained by electrochemical surface plasmon resonance and electrochemical quartz crystal microbalance [15].…”

Electrochemical determination of L-dopa at cobalt hexacyanoferrate/large-mesopore carbon composite modified electrode

“…This is most likely to be attributed to the thin layer and porous surface effects and high surface area of LMC [41,42]. CoHCF-LMC/GC (c) electrode, respectively.…”

Voltammetric selectivity conferred by the modification of electrodes using conductive porous layers or films: The oxidation of dopamine on glassy carbon electrodes modified with multiwalled carbon nanotubes

“…We further report experiments for the detection of dopamine at a carbon nanotube (CNT) modified electrode which suggest that a 'thin layer' mass transport regime can operate, building on some earlier results of voltammetry at such modified electrodes [160][161][162] and at fullerene modified electrodes [163], and hence that this, and not necessarily altered electrode kinetics, may at least to some extent be behind the success of the chemically modified electrodes reported in Table 2, and also by extension quite possibly to some or many in Table 1.…”