Rajendran, Anandapadmanabhan A;
Guo, Keying;
Alvarez-Fernandez, Alberto;
Gengenbach, Thomas R;
Velasco, Marina B;
Fornerod, Maximiliano J;
Shafique, Kandeel;
... Prieto-Simón, Beatriz; + view all
(2024)
A new class of porous silicon electrochemical transducers built from pyrolyzed polyfurfuryl alcohol.
Materials Today Advances
, 21
, Article 100464. 10.1016/j.mtadv.2024.100464.
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Abstract
Carbon-based nanomaterials are key to developing high-performing electrochemical sensors with improved sensitivity and selectivity. Nonetheless, limitations in their fabrication and integration into devices often constrain their practical applications. Moreover, carbon nanomaterials-based electrochemical devices still face problems such as large background currents, poor stability, and slow kinetics. To advance towards a new class of carbon nanostructured electrochemical transducers, we propose the in-situ polymerization and carbonization of furfuryl alcohol (FA) on porous silicon (pSi) to produce a tailored and highly stable transducer. The thin layer of polyfurfuryl alcohol (PFA) that conformally coats the pSi scaffold transforms into nanoporous carbon when subjected to pyrolysis above 600 ◦C. The morphological and chemical properties of PFA-pSi were characterized by scanning electron microscopy, and Raman and X-ray photoelectron spectroscopies. Their stability and electrochemical performance were investigated by cyclic voltammetry and electrochemical impedance spectroscopy in [Fe(CN)6]3-/4-, [Ru(NH3)6]2+/3+, and hydroquinone. PFA-pSi showed superior electrochemical performance compared to screen-printed carbon electrodes while also surpassing glassy carbon electrodes in specific aspects. Besides, PFA-pSi has the additional advantage of easy tuning of the electroactive surface area. To prove its potential for biosensing purposes, a DNA sensor based on quantifying the partial pore blockage of the pSi upon target hybridization was built on PFA-pSi. The sensor showed a limit of detection of 1.4 pM, outperforming other sensors based on the same sensing mechanism.
| Type: | Article |
|---|---|
| Title: | A new class of porous silicon electrochemical transducers built from pyrolyzed polyfurfuryl alcohol |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.mtadv.2024.100464 |
| Publisher version: | http://dx.doi.org/10.1016/j.mtadv.2024.100464 |
| Language: | English |
| Additional information: | This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync- nd/4.0/). |
| Keywords: | Porous silicon, Carbon-stabilization, Polyfurfuryl alcohol, Electrochemical transducer, DNA sensor |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Engineering Science Faculty Office |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10186277 |
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