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. 2020 Jun 4:8:430.
doi: 10.3389/fchem.2020.00430. eCollection 2020.

Facile One-Step Electrodeposition Preparation of Cationic Pillar[6]arene-Modified Graphene Films on Glassy Carbon Electrodes for Enhanced Electrochemical Performance

Qunpeng Duan  1 , Lijie Wang  1 , Fei Wang  1 , Hongsong Zhang  1 , Kui Lu  1   2
Affiliations

Facile One-Step Electrodeposition Preparation of Cationic Pillar[6]arene-Modified Graphene Films on Glassy Carbon Electrodes for Enhanced Electrochemical Performance

Qunpeng Duan et al. Front Chem. .

Abstract

In the present work, we have developed a facile one-step route for preparing electrochemically reduced graphene oxide-cationic pillar[6]arene (ErGO-CP6) nanocomposite films on glassy carbon electrodes (GCEs) directly from graphene oxide-cationic pillar[6]arene (GO-CP6) colloidal solution by using a pulsed electrodeposition technique. The electrocatalytic activity of ErGO-CP6 was examined by studying the oxidations of five purine bases [adenine (A), guanine (G), xanthine (X), hypoxanthine (HX), and uric acid (UA)]. It enhanced the oxidation currents of A, G, X, HX, and UA when compared to unmodified ErGO films and bare GCE, which is considered to be the synergetic effects of the graphene (excellent electrical properties and large surface area) and CP6 molecules (high inclusion complexation and enrichment capability).

Keywords: electrochemical performance; electrodeposition; graphene films; host-guest inclusion; pillar[6]arene.

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Figures

Scheme 1
Scheme 1
Schematic illustration for the pulsed electrodeposition preparation of ErGO and ErGO-CP6 films on the surface of GCE and sensing the purine bases by an electrochemical strategy.
Figure 1
Figure 1
Characterization of materials. FTIR spectra (A), UV-vis absorption spectra (B), and TGA curves of CP6, GO-CP6, and GO (C). XPS survey spectra of GO and GO-CP6 (D).
Figure 2
Figure 2
Zeta potentials of GO and GO-CP6.
Figure 3
Figure 3
SEM images of ErGO films (A) and ErGO-CP6 films (B) modified GCE.
Figure 4
Figure 4
(A) Raman spectra of GO and ErGO; (B) Raman spectra of GO-CP6 and ErGO-CP6.
Figure 5
Figure 5
CVs and peak current of CVs of (A,F) 5 μM A, (B,G) 5 μM G, (C,H) 5 μM X, (D,I) 5 μM HX, and (E,J) 5 μM UA in 0.2 M PBS (pH 6.8) on (a) bare GCE, (b) ErGO/GCE, and (c) ErGO-CP6/GCE. Scan rate: 50 mV·s−1.
Figure 6
Figure 6
(A) DPV response for the different concentrations of UA on ErGO-CP6/GCE in 0.2 M PBS (pH 6.8). (B) The calibration curve of UA.
Figure 7
Figure 7
The ipa response of ErGO-CP6/GCE in solution containing 2 μM UA in the absence and presence of 10-fold dopamine, histamine, phenethylamine, and tryptamine, using DPV and keeping all the parameters constant.
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