2022
DOI: 10.1021/acsanm.1c04222
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ZnO–ZnFe2O4/Fe3O4/Carbon Nanocomposites for Ultrasensitive and Selective Dopamine Detection

Abstract: Electrochemical detection of submicromolar levels of dopamine (DA) by iron–carbon-based redox mediators requires the synergistic effect of facile Fe2+ ↔ Fe3+ redox chemistry, high DA adsorption capacity, and fast electron-transfer kinetics. Its absence in most reported mediators has led to detection limits that are well above the lower threshold [DA] in healthy humans (i.e., 0.01 μM). Herein, we report a ZnO–ZnFe2O4/Fe3O4/carbon nanocomposite, which possesses the aforementioned synergy and therefore displays i… Show more

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Cited by 13 publications
(11 citation statements)
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“…The calculated electron transfer number is about 2.0. It is worth noting that the peak-to-peak separation potential increases with the increase of the scanning rate, which means that the charge transfer dynamics limit DA oxidation . As shown in Figure S10, the electron transfer rate constant (Ks) of In 1 –N-C and In–N–C–X are calculated to be 0.2643, 0.1575, 0.117, and 0.0719 s –1 , respectively, indicating that the electron transfer kinetics between DA and In 1 –N–C is faster.…”
Section: Resultsmentioning
confidence: 94%
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“…The calculated electron transfer number is about 2.0. It is worth noting that the peak-to-peak separation potential increases with the increase of the scanning rate, which means that the charge transfer dynamics limit DA oxidation . As shown in Figure S10, the electron transfer rate constant (Ks) of In 1 –N-C and In–N–C–X are calculated to be 0.2643, 0.1575, 0.117, and 0.0719 s –1 , respectively, indicating that the electron transfer kinetics between DA and In 1 –N–C is faster.…”
Section: Resultsmentioning
confidence: 94%
“…It is worth noting that the peak-to-peak separation potential increases with the increase of the scanning rate, which means that the charge transfer dynamics limit DA oxidation. 42 As shown in Figure S10 In−N 4 and In(001) models are analyzed. As shown in Figure 3e, the In−N 4 model has a higher s-and p-band center than the In(001) model, indicating that more electrons fill the antibonding orbital.…”
Section: ■ Introductionmentioning
confidence: 99%
“…44,45 The peaks of the nanoparticle@NSP-BC electrocatalyst between 250 and 750 cm −1 (light pink square) are considered to come from the Fe 3 O 4 nanoparticle and the Zn doped Fe 3 O 4 nanoparticle in the hybrid nanoparticle@biomass carbon nanocomposite. 46…”
Section: Resultsmentioning
confidence: 99%
“…The PBS (0.1 M, pH = 7.4) was prepared by mixing KH 2 PO 4 and K 2 HPO 4 ·3H 2 O at the ratio of 4:6. The limit of detection (LOD) was calculated using the formula: LOD = 3 σ / b where σ is the standard deviation and b is the slope of the fitting curve.…”
Section: Methodsmentioning
confidence: 99%