Ultra-thin nanosheets-assembled hollowed-out hierarchical α-Fe2O3 nanorods: Synthesis via an interface reaction route and its superior gas sensing properties

Abstract Because of the lack of proper pore structure, the development of ultra-fast responding and recovering gas sensors materials remains a challenge. Herein, we report the synthesis of hollowed-out hierarchical α-Fe 2 O 3 nanorods via the interfacial-reaction of FeC 2 O 4 ·2H 2 O with NaOH for the first time. The as-prepared hierarchical nanorods assembled by interlaced ultrathin nanosheets (with thickness of around 3 nm) possess large specific surface area and novel open-style pore structure, which endow it with large amount of gas adsorption and rapid gas diffusion. Gas sensing measurement revealed that the hollowed-out hierarchical α-Fe 2 O 3 nanorods exhibit high response and ultra-fast response/recovery characteristics to acetone and ethanol (the response/recovery time of the gas sensor to 100 ppm acetone and ethanol are 0.4/2.4 s and 0.8/3.2 s, respectively). As demonstrated, the hollowed-out hierarchical α-Fe 2 O 3 nanorods assembled by ultrathin nanosheets which synthesized via a new strategy are highly promising for real-time monitoring gas sensor which has not only high response but also ultra-fast responding and recovering behaviors.

[1]  Zhaoxiong Xie,et al.  MOF-templated synthesis of porous Co(3)O(4) concave nanocubes with high specific surface area and their gas sensing properties. , 2014, ACS applied materials & interfaces.

[2]  Teng Fei,et al.  Three-dimensional hierarchical flowerlike α-Fe2O3 nanostructures: synthesis and ethanol-sensing properties. , 2011, ACS applied materials & interfaces.

[3]  D. G. McCartney,et al.  Growth and characterization of iron oxide nanorods/nanobelts prepared by a simple iron-water reaction. , 2006, Small.

[4]  Mengmeng Li,et al.  Zeolitic Imidazolate Framework Coated ZnO Nanorods as Molecular Sieving to Improve Selectivity of Formaldehyde Gas Sensor , 2016 .

[5]  Ying Tian,et al.  Simple and rapid synthesis of α-Fe2O3 nanowires under ambient conditions , 2009 .

[6]  Song Chen,et al.  Synthesis of ZnO nanorods and its application in NO2 sensors , 2011 .

[7]  Y. Zhai,et al.  Low temperature solution-based synthesis of porous flower-like α-Fe2O3 superstructures and their excellent gas-sensing properties , 2011 .

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

[9]  In-Sung Hwang,et al.  CuO nanowire gas sensors for air quality control in automotive cabin , 2008 .

[10]  Padmaja Guggilla,et al.  Micro- and nano-structured metal oxides based chemical sensors: an overview. , 2014, Journal of nanoscience and nanotechnology.

[11]  Changhui Zhao,et al.  Fabrication of porous nanosheet-based Co3O4 hollow nanocubes for electrochemical capacitors with high rate capability , 2015 .

[12]  Jun Liu,et al.  Self-assembly of [100] grown ZnO nanowhiskers with exposed reactive (0001) facets on hollow spheres and their enhanced gas sensitivity , 2011 .

[13]  Yaqi Jiang,et al.  Synthesis of tin dioxide octahedral nanoparticles with exposed high-energy {221} facets and enhanced gas-sensing properties. , 2009, Angewandte Chemie.

[14]  Adisorn Tuantranont,et al.  Electrolytically exfoliated graphene-loaded flame-made Ni-doped SnO2 composite film for acetone sensing. , 2015, ACS applied materials & interfaces.

[15]  Weijie Ji,et al.  Morphology-directed synthesis of Co3O4 nanotubes based on modified Kirkendall effect and its application in CH4 combustion. , 2012, Chemical communications.

[16]  C. Cao,et al.  Novel gas sensoring materials based on CuS hollow spheres , 2009 .

[17]  Xin Guo,et al.  NO sensing by single crystalline WO3 nanowires , 2015 .

[18]  J. H. Lee,et al.  C2H5OH sensing characteristics of various Co3O4 nanostructures prepared by solvothermal reaction , 2010 .

[19]  Kengo Shimanoe,et al.  New perspectives of gas sensor technology , 2009 .

[20]  Chunhua Yan,et al.  Single-crystalline iron oxide nanotubes. , 2005, Angewandte Chemie.

[21]  H. Fan,et al.  Porous thin sheet-based α-Fe2O3-doped In2O3 structures: hydrothermal synthesis and enhanced Cl2 sensing performance , 2013 .

[22]  H. Fan,et al.  Room-temperature solid state synthesis of ZnO/α-Fe2O3 hierarchical nanostructures and their enhanced gas-sensing properties , 2012 .

[23]  Kun Liu,et al.  Synthesis of porous α-Fe2O3 microrods via in situ decomposition of FeC2O4 precursor for ultra-fast responding and recovering ethanol gas sensor , 2016 .

[24]  Xiaoguang Gao,et al.  Gas-sensing properties of hollow and hierarchical copper oxide microspheres , 2007 .

[25]  H. Fan,et al.  Fast economical synthesis of Fe-doped ZnO hierarchical nanostructures and their high gas-sensing performance , 2013 .

[26]  G. K. Pradhan,et al.  Fabrication, growth mechanism, and characterization of α-Fe(2)O(3) nanorods. , 2011, ACS applied materials & interfaces.

[27]  K. Choi,et al.  Enhanced CO sensing characteristics of hierarchical and hollow In2O3 microspheres , 2009 .

[28]  Chao-Nan Xu,et al.  Grain size effects on gas sensitivity of porous SnO2-based elements , 1991 .

[29]  Xiaohong Sun,et al.  Nanocasting synthesis of In2O3 with appropriate mesostructured ordering and enhanced gas-sensing property. , 2014, ACS applied materials & interfaces.

[30]  A. Gurlo,et al.  Hybrid organotin and tin oxide-based thin films processed from alkynylorganotins: synthesis, characterization, and gas sensing properties. , 2014, ACS applied materials & interfaces.

[31]  B. Liu,et al.  Controlled synthesis and gas-sensing properties of hollow sea urchin-like α-Fe2O3 nanostructures and α-Fe2O3 nanocubes , 2009 .

[32]  Kengo Shimanoe,et al.  Roles of Shape and Size of Component Crystals in Semiconductor Gas Sensors , 2008 .

[33]  Yongjian Tang,et al.  High response to H2S gas with facile synthesized hierarchical ZnO microstructures , 2015 .

[34]  N. Yamazoe,et al.  Oxide Semiconductor Gas Sensors , 2003 .

[35]  Jianhui Zhu,et al.  Facile synthesis of α-Fe2O3@SnO2 core–shell heterostructure nanotubes for high performance gas sensors , 2015 .

[36]  Yong Wang,et al.  Fast-response and high sensitivity gas sensors based on SnO2 hollow spheres , 2008 .

[37]  Jun Zhang,et al.  ZnO hollow spheres: Preparation, characterization, and gas sensing properties , 2009 .

[38]  S. Akbar,et al.  Highly sensitive and ultra-fast responding gas sensors using self-assembled hierarchical SnO2 spheres , 2009 .

[39]  J. H. Lee,et al.  Design of a highly sensitive and selective C2H5OH sensor using p-type Co3O4 nanofibers , 2012 .

[40]  Il-Doo Kim,et al.  Thin-walled NiO tubes functionalized with catalytic Pt for highly selective C2H5OH sensors using electrospun fibers as a sacrificial template. , 2011, Chemical communications.

[41]  Ho Won Jang,et al.  Vertically ordered hematite nanotube array as an ultrasensitive and rapid response acetone sensor. , 2014, ACS applied materials & interfaces.

[42]  J. Goodenough,et al.  Facile synthesis of monodisperse porous Co3O4 microspheres with superior ethanol sensing properties. , 2011, Chemical communications.