Cr2O3-sensitized ZnO electrospun nanofibers based ethanol detectors

Wang, Wei; Li, Zhenyu; Zheng, Weitao; Hu, Haitao; Wang, Ce; Sun, Junli

doi:10.1016/j.snb.2009.10.016

Cited by 96 publications

(36 citation statements)

References 27 publications

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“…Nanofibers of niobium oxide (NbO 2 ) and titanium dioxide (Ti 4 O 7 ) were synthesized using a similar route employed in the synthesis of TiO 2 [10] and several other oxides such as Al 2 O 3 [11], V 2 O 5 , ZnO [12], and doped-oxides [13,14]. The synthesis involved electrospinning of a mixture of metal alkoxides, niobium(V) ethoxide or titanium(IV) isopropoxide, and polymer polyvinyl pyrrolidone (PVP) in anhydrous ethanol.…”

Section: Experimental Methodsmentioning

confidence: 99%

Electrocatalytic activity and durability of Pt/NbO2 and Pt/Ti4O7 nanofibers for PEM fuel cell oxygen reduction reaction

Senevirathne

Hui

Campbell

et al. 2012

Electrochimica Acta

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a b s t r a c tIn this paper, we report the synthesis of both NbO 2 and Ti 4 O 7 nanofibers using an electrospinning technique in an effort to use metal oxides as a possible replacement for carbon as PEM fuel cell catalyst supports. The synthesized nanofibers are physically characterized using several methods including XRD, SEM, TEM, BET, ICP-MS as well as XPS. The thermal, chemical, and electrochemical stabilities as well as the electronic conductivities of these two supports are also evaluated in order to check their feasibility as catalyst supports in the temperature range of 95-200• C. Two catalysts, 20-wt% Pt/NbO 2 and 20-wt% Pt/Ti 4 O 7 , are prepared and tested for both ORR mass activity and stability in acidic solution. XPS measurements of samples analyzed before and after the durability tests suggest the formation of electronically insulating surface oxides, which can be partially responsible for both low ORR mass activity and catalyst durability.Crown

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Section: Experimental Methodsmentioning

confidence: 99%

Electrocatalytic activity and durability of Pt/NbO2 and Pt/Ti4O7 nanofibers for PEM fuel cell oxygen reduction reaction

Senevirathne

Hui

Campbell

et al. 2012

Electrochimica Acta

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“…This makes it even more difficult to understand the reaction mechanism. The improvements in sensing performances have been attributed to band bending [67], charge carrier separation [68], depletion layer modification [69,70], increased potential energy barrier [71], decreases in activation energy [72], and increased surface availability [73].…”

Section: Functional Propertiesmentioning

confidence: 99%

ZnO Quasi-1D Nanostructures: Synthesis, Modeling, and Properties for Applications in Conductometric Chemical Sensors

2016

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Abstract:One-dimensional metal oxide nanostructures such as nanowires, nanorods, nanotubes, and nanobelts gained great attention for applications in sensing devices. ZnO is one of the most studied oxides for sensing applications due to its unique physical and chemical properties. In this paper, we provide a review of the recent research activities focused on the synthesis and sensing properties of pure, doped, and functionalized ZnO quasi-one dimensional nanostructures. We describe the development prospects in the preparation methods and modifications of the surface structure of ZnO, and discuss its sensing mechanism. Next, we analyze the sensing properties of ZnO quasi-one dimensional nanostructures, and summarize perspectives concerning future research on their synthesis and applications in conductometric sensing devices.

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“…So far, attempts have been focused on the development of n-type semiconducting metal oxide based gas sensors, such as SnO 2 [3,4], TiO 2 [5], In 2 O 3 [6], and WO 3 [7]. Only few works dealt with gas sensors based on p-type semiconducting metal oxides such as CuO [8], Cr 2 O 3 [9], Co 3 O 4 [10]. Among p-type semiconductors, Co 3 O 4 is a promising material (with an optical band gap of 1.77 and 3.17 eV) due to its potential applications as gas sensors [11,12], anode materials in Li ion batteries [13], heterogeneous catalysts [14] and magnetic materials [15].…”

Section: Introductionmentioning

confidence: 99%

Undoped and Mn-doped Co3O4 nanorods for ethanol sensing

Stella

Soundararajan

Ramachandran

2015

J Mater Sci: Mater Electron

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Undoped and Mn-doped (1 at.%) Co 3 O 4 were synthesized by simple precipitation method. The morphology of the material was investigated by scanning electron microscopy which confirmed the formation of nanorods (NRs). The NRs were formed from interconnected nanoparticles. X-ray diffraction analysis confirmed the presence and crystalline nature of the Co 3 O 4 NRs. FTIR studies revealed that the defects are present in undoped Co 3 O 4 . Raman spectra confirmed the presence of five Raman active modes and the doping of Mn shifts the Raman peaks to higher wave number. Spectral responses of clad modified fiber optic gas sensor are studied for various concentrations (0-500 ppm) of ethanol at room temperature, where the clad portion is replaced with undoped and Mn-doped Co 3 O 4 and used as gas sensing material. Since the refractive index of the samples calculated from UV-Vis absorption spectra is greater than that of core, the fiber optic sensor works under leaky mode condition. The sensor showed linear variation in the spectral peak intensity with ethanol concentration. Undoped Co 3 O 4 exhibits higher sensitivity compared to Mn-doped Co 3 O 4 due to defects present in the undoped sample which offers more reactive sites for ethanol adsorption.

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Cr2O3-sensitized ZnO electrospun nanofibers based ethanol detectors

Cited by 96 publications

References 27 publications

Electrocatalytic activity and durability of Pt/NbO2 and Pt/Ti4O7 nanofibers for PEM fuel cell oxygen reduction reaction

Electrocatalytic activity and durability of Pt/NbO2 and Pt/Ti4O7 nanofibers for PEM fuel cell oxygen reduction reaction

ZnO Quasi-1D Nanostructures: Synthesis, Modeling, and Properties for Applications in Conductometric Chemical Sensors

Undoped and Mn-doped Co3O4 nanorods for ethanol sensing

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