Electrospun ?-Fe^sub 2^O^sub 3^ nanofibers as bioelectrochemical sensors for simultaneous determination of small biomolecules

Nanofibers of α-Fe2O3 and γ-Fe2O3 have been obtained after the controlled calcination of precursor nanofibers synthesized by electrospinning. α-Fe2O3 nanofibers showed an irregular toruloid structure due to the decomposition of poly (4-vinyl) pyridine in air while γ-Fe2O3 nanoparticles decorated nan...

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Published inAnalytica chimica acta Vol. 1026; p. 125
Main Authors Wang, Qianbin, Liu, Shuibo, Fu, Liyun, Cao, Zhengshuai, Ye, Wanneng, Li, Hongliang, Guo, Peizhi, Zhao, XS
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier BV 05.10.2018
Subjects
Ascorbic acid
Biomolecules
Dopamine
Electrocatalysis
Electrochemistry
Electrodes
Glassy carbon
Hematite
Iron oxides
Nanofibers
Nanoparticles
Oxidation
Pyridines
Roasting
Uric acid
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Summary:Nanofibers of α-Fe2O3 and γ-Fe2O3 have been obtained after the controlled calcination of precursor nanofibers synthesized by electrospinning. α-Fe2O3 nanofibers showed an irregular toruloid structure due to the decomposition of poly (4-vinyl) pyridine in air while γ-Fe2O3 nanoparticles decorated nanofibers were observed after the calcination under N2 atmosphere. Electrochemical measurements showed that different electrochemical behaviors were observed on the glassy carbon electrodes modified by α-Fe2O3 and γ-Fe2O3 nanofibers. The electrode modified by γ-Fe2O3 nanofibers exhibited high electrocatalytic activities toward oxidation of dopamine, uric acid and ascorbic acid while α-Fe2O3 nanofibers cannot. Furthermore, the γ-Fe2O3 modified electrode can realize the selective detection of biomolecules in ternary electrolyte solutions. The synthesis of nanofibers of α-Fe2O3 and γ-Fe2O3 and their electrochemical sensing properties relationship have been discussed and analyzed based on the experimental results.
ISSN:0003-2670
1873-4324