Improving Surface Adsorption via Shape Control of Hematite α‑Fe<sub>2</sub>O<sub>3</sub> Nanoparticles for Sensitive Dopamine Sensors


α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles (NPs) with morphologies varying from shuttle to drum were synthesized through an anion-assisted and surfactant-free hydrothermal method by simply varying the ratios of ethanol and water in solvent. Control experiments show that the structural evolution can be attributed to a small-molecular-induced anisotropic growth mechanism in which the growth rate of α-Fe<sub>2</sub>O<sub>3</sub> NPs along the <i>a</i>-, <i>b</i>-, or <i>c</i>-axis was well-controlled. The detailed structural analysis through the high-resolution transmission electron microscope (HRTEM) indicated that shuttle-like Fe<sub>2</sub>O<sub>3</sub> NP surface was covered by high-density atomic steps, which endowed them with the enhanced adsorption and sensor ability toward dopamine (DA). The XPS characterizations indicated that the percentages of the O<sub>C</sub> component follow the order of shuttle-like Fe<sub>2</sub>O<sub>3</sub> (S-Fe<sub>2</sub>O<sub>3</sub> for short) > pseudoshuttle-like Fe<sub>2</sub>O<sub>3</sub> (Ps-Fe<sub>2</sub>O<sub>3</sub> for short) > polyhedron-like Fe<sub>2</sub>O<sub>3</sub> (Ph-Fe<sub>2</sub>O<sub>3</sub> for short) > drum-like Fe<sub>2</sub>O<sub>3</sub> (D-Fe<sub>2</sub>O<sub>3</sub> for short). Benefits from these structural advantages, the S-Fe<sub>2</sub>O<sub>3</sub> NPs–Nafion composite electrode exhibited remarkable electrochemical detection ability with a wide liner range from 0.2 μM to 0.107 mM and a low detection limit of 31.25 nM toward DA in the presence of interferents

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oai:figshare.com:article/4276631Last time updated on 2/12/2018

This paper was published in FigShare.

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