title: Improving Surface Adsorption via Shape Control of Hematite α-Fe2O3Nanoparticles for Sensitive Dopamine Sensors.
abstract: α-Fe2O3nanoparticles (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-Fe2O3NPs along the a-, b-, or c-axis was well-controlled. The detailed structural analysis through the high-resolution transmission electron microscope (HRTEM) indicated that shuttle-like Fe2O3NP 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 OCcomponent follow the order of shuttle-like Fe2O3(S-Fe2O3for short) > pseudoshuttle-like Fe2O3(Ps-Fe2O3for short) > polyhedron-like Fe2O3(Ph-Fe2O3for short) > drum-like Fe2O3(D-Fe2O3for short). Benefits from these structural advantages, the S-Fe2O3NPs-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.
authors.affiliation: School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an, Shaanxi 710049, People's Republic of China.
authors.forename: Anran
authors.initials: A
authors.lastname: Chen
authors.affiliation: School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an, Shaanxi 710049, People's Republic of China.
authors.forename: Liang
authors.initials: L
authors.lastname: Xu
authors.affiliation: School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an, Shaanxi 710049, People's Republic of China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an, Shaanxi 710049, People's Republic of China.|Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Academy of Xi'an Jiaotong University , Suzhou, Jiangsu 215000, People's Republic of China.
authors.forename: Zhimao
authors.initials: Z
authors.lastname: Yang
authors.affiliation: School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University , Xi'an, Shaanxi 710049, People's Republic of China.|Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Academy of Xi'an Jiaotong University , Suzhou, Jiangsu 215000, People's Republic of China.
authors.forename: Shengchun
authors.initials: S
authors.lastname: Yang
keywords: chemical absorption; dopamine; electrochemical biosensor; hematite; shape evolution