Nanoscale engineering to control mass transfer on carbon-based electrodes

Pascual, Laura Ferrer; Pande, Ishan; Kousar, Ayesha; Rantataro, Samuel; Laurila, Tomi

doi:10.1016/j.elecom.2022.107328

Cited by 8 publications

(19 citation statements)

References 20 publications

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“…However, a significant drop in Δ E p for CNF-30mins at 400 mV/was seen (Table S1). The reduction of Δ E p and an apparent increase in k 0 at 400 mV/s for CNF-30mins can be explained by the matching of CNF lengths with the diffusion layer thickness that results in the thin liquid layer formation . The main implication for this study is that we need to consider the possible thin liquid layer effects while analyzing the electrochemical results for different analytes.…”

Section: Resultsmentioning

confidence: 99%

“…Peak separation (ΔE p ) values at 100 mV/s and 400 mV/s are provided as a measure to study the reaction kinetics, as well as the effect of any thin layer formation. 23 Differences in the CNF lengths did not cause noticeable differences in ΔE p , and the electron transfer kinetics were nearly reversible at 100 mV/s. I pa /I pc values did not differ noticeably with the changes in the lengths of the fibers and confirmed the electron transfer to be nearly reversible in all cases.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…To show this, CNF electrodes with different lengths were fabricated by varying the duration of the growth phase to 1, 5, 10, and 30 min. The silicon substrates were coated with 80 nm of Cr as an adhesive layer, and 20 nm of Ni was used as a catalyst to grow CNF for all cases studied here . The fabrication conditions were identical for all the electrodes except the growth duration, thus providing us the CNF with different lengths yet similar surface chemistries.…”

Section: Introductionmentioning

confidence: 99%

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Modulating the Geometry of the Carbon Nanofiber Electrodes Provides Control over Dopamine Sensor Performance

et al. 2023

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One of the major challenges for in vivo electrochemical measurements of dopamine (DA) is to achieve selectivity in the presence of interferents, such as ascorbic acid (AA) and uric acid (UA). Complicated multimaterial structures and ill-defined pretreatments have been frequently utilized to enhance selectivity. The lack of control over the realized structures has prevented establishing associations between the achieved selectivity and the electrode structure. Owing to their easily tailorable structure, carbon nanofiber (CNF) electrodes have become promising materials for neurobiological applications. Here, a novel yet simple strategy to control the sensitivity and selectivity of CNF electrodes toward DA is reported. It consists of adjusting the lengths of CNF by modulating the growth phase during the fabrication process while keeping the surface chemistries similar. It was observed that the sensitivity of the CNF electrodes toward DA was enhanced with the increase in the fiber lengths. More importantly, the increase in the fiber length induced (i) an anodic shift in the DA oxidation peak and (ii) a cathodic shif t in the AA oxidation peak. As the UA oxidation peak remained unaffected at high anodic potentials, the electrodes with long CNFs showed excellent selectivity. Electrodes without proper fibers showed only a single broad peak in the solution of AA, DA, and UA, completely lacking the ability to discriminate DA. Hence, the simple strategy of controlling CNF length without the need to carry out any complex chemical treatments provides us a feasible and robust route to fabricate electrode materials for neurotransmitter detection with excellent sensitivity and selectivity.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modulating the Geometry of the Carbon Nanofiber Electrodes Provides Control over Dopamine Sensor Performance

et al. 2023

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“…Therefore, we determined the pseudocapacitance and analytical potential window of the CNFs in these two electrolytes. The effects of the dimensions of CNFs on the electron transfer kinetics were studied using an OSR probe Ru(NH 3 ) 6 Cl 3 (in PBS), which is known to be insensitive to the surface chemistry of the electrodes [29].…”

Section: Resultsmentioning

confidence: 99%

“…As the nanofiber lengths reach hundreds of nanometers, thin liquid layer formation is a feasible option in this system, especially in the case of the longest CNFs within the scan rates used in this study. A detailed study of the thin-liquid layer formation on these electrodes is presented in a separate work [29].…”

Section: Resultsmentioning

confidence: 99%