am6b11088_si_001.pdf (1.45 MB)
Improving Surface Adsorption via Shape Control of Hematite α‑Fe2O3 Nanoparticles for Sensitive Dopamine Sensors
journal contribution
posted on 2016-11-21, 00:00 authored by Anran Chen, Liang Xu, Xiaojing Zhang, Zhimao Yang, Shengchun Yangα-Fe2O3 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-Fe2O3 NPs 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 Fe2O3 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 OC component follow the order of shuttle-like Fe2O3 (S-Fe2O3 for short) > pseudoshuttle-like
Fe2O3 (Ps-Fe2O3 for short)
> polyhedron-like Fe2O3 (Ph-Fe2O3 for short) > drum-like Fe2O3 (D-Fe2O3 for short). Benefits from these structural
advantages,
the S-Fe2O3 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.
History
Usage metrics
Categories
Keywords
detection limitelectrochemical detection abilityshuttle-like Fe 2 O 3surfactant-free hydrothermal methodshuttle-like Fe 2 O 3 NP surfaceHRTEMShape ControlPh-Fe 2 O 30.107 mMsmall-molecular-induced anisotropic growth mechanismsensor abilitySensitive Dopamine Sensors α- Fe 2 O 3 nanoparticlesXPS characterizationsliner rangePs-Fe 2 O 3transmission electron microscopeD-Fe 2 O 331.25 nMcontrol experiments showSurface Adsorptiondrum-like Fe 2 O 3DA0.2 μ Mα- Fe 2 O 3 NPsgrowth ratepolyhedron-like Fe 2 O 3O C componentpseudoshuttle-like Fe 2 O 3S-Fe 2 O 3
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC