Dispersion of multi-walled carbon nanotubes in [BMIM]PF 6 for electrochemical sensing of acetaminophen

Abstract

The influence of functionalized multi-walled carbon nanotubes (fMWCNT) in the presence of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF) in different ratios was investigated on the acetaminophen (ACOP) electrochemical determination. The electrochemical behavior of the ACOP exhibited a pair of well-defined redox peaks, suggesting that the reversibility of ACOP was significantly improved in comparison to irreversible oxidation peak on bare GCE. The redox process was controlled by adsorption, involves two electrons and the value of apparent rate constant (k) was equal to 14.7 s ± 3.6 s. The analytical curves were obtained for concentrations of ACOP ranging from 0.3 to 3.0 μmol L. The values of the detection limit were calculated from SWV and found to be 6.73 × 10 mol L. The proposed electrochemical sensor exhibited good stability and reproducibility and was applied for ACOP determination in tablets (Tylenol® and Tylenol®DC) with satisfactory results.

Ionic liquid-supported magnetite nanoparticles as electrode modifier materials for estrogens sensing

“…The zeta potentials of −13.2 ± 0.2 mV and +67.2 ± 0.4 mV were obtained for Fe 3 O 4 NPs and Fe 3 O 4 NPs-BMI.PF 6 , respectively. The surface potential became positive after modification with BMI.PF 6 , which is related of the positive charge localized in the imidazole ring of ionic liquid 23 . In addition, according to the literature, the Fe 3 O 4 NPs-BMI.PF 6 dispersion is considered stable for having a potential zeta value above +30 mV.…”

Morphological and Chemical Analysis of the Molecularly-Imprinted Polymer-Based D-Arabinose Sensor on a Modified Electrode with Functionalized Carbon Nanotubes

“…Figure 1(a) shows the surface of the graphite and paraffin composite electrode without any modification, while Figure 1 (b) shows a change in its surface due to the electrodeposition of the FMWCNTs. Nanotubes have a highly tangled structure caused by πpi stacking interactions, which increases the surface area of the electrode and allows the electroactive probes to diffuse easily [22,23].…”

Visible Light Photoelectrochemical Sensor for Acetaminophen Determination using a Glassy Carbon Electrode Modified with BiVO4 Nanoparticles

“…[59], the point of zero charge value of BiVO 4 is 3.0, indicating that at pH above 3 the BiVO 4 nanoparticles are negatively charged, thus justifying the good interaction between the PEC sensor and AC molecules, as well as the increase in the photocurrent. Furthermore, Prado et al [53] also reported a better photocurrent response of dopamine (pKa = 9.3) at pH = 9 using a PEC sensor with BiVO 4 particles, suggesting that BiVO 4 material presents better responses at high pH values.…”

“…In the literature, there are reports various methods AC determination using different analytical techniques such as spectrophotometry [36][37][38] and chromatography [39,40]. Electroanalytical methods are also reported utilizing different unmodified and modified carbon electrodes [28,30,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. Additionally, two works has been published in the literature involving the use of PEC sensors for AC determination.…”