Facile Synthesis of Porous α-Fe2O3 Nanorods and Their Application in Ethanol Sensors

A facile solution approach was employed to synthesize α-FeOOH nanorods by using FeSO4·7H2O and CH3COONa without templates at low temperature (40 °C). The porous α-Fe2O3 nanorods were successfully obtained by calcining the α-FeOOH precursors at 300 °C for 2 h. The as-prepared products were characterized by thermogravimetry-differential thermal analysis, X-ray powder diffraction, transmission electron microscopy (TEM), high-resolution TEM, and N2 adsorption−desorption analysis techniques. The as-prepared porous α-Fe2O3 nanorods have a tiny crystal size (5 nm) and a pore size distribution of 1−10 nm, resulting in a high specific surface area of 221.9 m2·g−1. A possible growth mechanism of the porous α-Fe2O3 nanorods was proposed. The gas-sensing measurement results demonstrated that the porous α-Fe2O3 nanorods presented a much higher response than the α-Fe2O3 nanoparticles and showed excellent selectivity and stability to ethanol vapor. Due to the fact that it has exciting gas-sensing properties and can be o...

[1]  Zhong Lin Wang,et al.  Nanobelts of Semiconducting Oxides , 2001, Science.

[2]  R. Schlögl,et al.  On the nature of the active site for the ethylbenzene dehydrogenation over iron oxide catalysts , 1998 .

[3]  K. Hara,et al.  Humidity- and gas-sensing properties with an Fe2O3 film sputtered on a porous Al2O3 film , 1993 .

[4]  C. Feldmann.  Preparation of Nanoscale Pigment Particles , 2001 .

[5]  Lei Jiang,et al.  Preparation of superhydrophilic α-Fe2O3 nanofibers with tunable magnetic properties , 2006 .

[6]  S. Mann,et al.  Template mineralization of self-assembled anisotropic lipid microstructures , 1993, Nature.

[7]  J. Tarascon,et al.  Nano-sized transition-metal oxides as negative-electrode materials for lithium-ion batteries , 2000, Nature.

[8]  Zhong Lin Wang,et al.  Controlled growth of large-area, uniform, vertically aligned arrays of alpha-Fe2O3 nanobelts and nanowires. , 2005, The journal of physical chemistry. B.

[9]  D. Zhao,et al.  Designed synthesis of mesoporous solids via nonionic-surfactant-templating approach. , 2007, Chemical communications.

[10]  Dong Wang,et al.  Hematite Hollow Spindles and Microspheres: Selective Synthesis, Growth Mechanisms, and Application in Lithium Ion Battery and Water Treatment , 2007 .

[11]  J. Loveday,et al.  High-pressure transitions in methane hydrate , 2001 .

[12]  F. Schüth.  Endo- and exotemplating to create high-surface-area inorganic materials. , 2003, Angewandte Chemie.

[13]  Shihua Wu,et al.  Synthesis and characterization of monodisperse hematite nanoparticles modified by surfactants via hydrothermal approach , 2004 .

[14]  A. Greiner,et al.  Polymer Nanotubes by Wetting of Ordered Porous Templates , 2002, Science.

[15]  Baolin Zhu,et al.  Synthesis and characterization of Pd-doped α-Fe2O3 H2S sensor with low power consumption , 2007 .

[16]  N. Yamazoe.  New approaches for improving semiconductor gas sensors , 1991 .

[17]  Jae-pyoung Ahn,et al.  Sol–Gel Mediated Synthesis of Fe2O3 Nanorods , 2003 .

[18]  B. Tang,et al.  Facile route to α-FeOOH and α-Fe2O3 nanorods and magnetic property of α-Fe2O3 nanorods , 2006 .

[19]  S. Fu,et al.  Preparation and characterization of shuttle-like α-Fe2O3 nanoparticles by supermolecular template , 2005 .

[20]  Qing Peng,et al.  Vanadium Pentoxide Nanobelts: Highly Selective and Stable Ethanol Sensor Materials , 2005 .

[21]  B. Tang,et al.  Superparamagnetic Triblock Copolymer/Fe2O3 Hybrid Nanofibers , 2001 .

[22]  Yong Ding,et al.  Catalyst-nanostructure interfacial lattice mismatch in determining the shape of VLS grown nanowires and nanobelts: a case of Sn/ZnO. , 2004, Journal of the American Chemical Society.

[23]  Jun Chen,et al.  α‐Fe2O3 Nanotubes in Gas Sensor and Lithium‐Ion Battery Applications , 2005 .

[24]  Bing Liu,et al.  Synthesis and Characterization of Single Crystal a-Fe2O3 Nanobelts , 2005 .

[25]  Buxing Han,et al.  A Highly Efficient Chemical Sensor Material for H2S: α‐Fe2O3 Nanotubes Fabricated Using Carbon Nanotube Templates , 2005 .

[26]  H Zhao,et al.  Sol–gel route to pseudocubic shaped α-Fe2O3 alcohol sensor: preparation and characterization , 2005 .

[27]  Baolin Zhu,et al.  H2S sensing characteristics of Pt-doped α-Fe2O3 thick film sensors , 2007 .

[28]  J. Chai,et al.  Ethanol sensors based on nano-sized α-Fe2O3 with SnO2, ZrO2, TiO2 solid solutions , 2003 .

[29]  Jun Zhang,et al.  Low-temperature H2S sensors based on Ag-doped α-Fe2O3 nanoparticles , 2008 .

[30]  Kong,et al.  Nanotube molecular wires as chemical sensors , 2000, Science.

[31]  L. Chou,et al.  Systematic Study of the Growth of Aligned Arrays of α‐Fe2O3 and Fe3O4 Nanowires by a Vapor–Solid Process , 2006 .

[32]  S. Chaudhuri,et al.  Synthesis of a α-Fe2O3 nanocrystal in its different morphological attributes: growth mechanism, optical and magnetic properties , 2007 .

[33]  Yadong Li,et al.  Selected-Control Hydrothermal Synthesis of α- and β-MnO2 Single Crystal Nanowires , 2002 .

[34]  Y. Chu,et al.  One-step synthesis and properties of urchin-like PS/α-Fe2O3 composite hollow microspheres , 2007 .

[35]  E. Teller,et al.  On a Theory of the van der Waals Adsorption of Gases , 1940 .

[36]  G. Dai,et al.  A study of the sensing properties of thin film sensor to trimethylamine , 1998 .

[37]  V. V. Malyshev,et al.  Gas sensitivity of semiconductor Fe2O3-based thick-film sensors to CH4, H2, NH3 , 1994 .

[38]  C. Leonelli,et al.  Syntheses of Fe2O3/Silica Red Inorganic Inclusion Pigments for Ceramic Applications , 1998 .

[39]  I. Hamley.  Nanostructure fabrication using block copolymers , 2003 .

[40]  S. Capone,et al.  CO and NO2 sensing properties of doped-Fe2O3 thin films prepared by LPD , 2002 .