C2H5OH sensing characteristics of various Co3O4 nanostructures prepared by solvothermal reaction

Choi, Kwon Il; Kim, Hae Ryong; Kim, Kang Min; Liu, Dawei; Cao, Guozhong; Lee, Jong Heun

doi:10.1016/j.snb.2010.02.050

Cited by 175 publications

(66 citation statements)

References 50 publications

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“…26 Compared with bulk Co 3 O 4 , the peak positions of the five active modes of nano Co 3 O 4 are shifted to lower wave number and this phenomenon is attributed to the optical phonon confinement effect. ( 3d 7 ) in tetrahedral site and Co 3+ (3d 6 ) in an octahedral site, respectively. 27 With the addition of Mn and Fe, these modes are shifted slightly to lower wave number region.…”

Section: -7mentioning

confidence: 99%

“…[1][2][3] The study of magnetic properties of nanosized particles is of great importance from basic as well as applications point of view. Among the various transition metal oxides, Co 3 O 4 is an important p-type semiconductor (direct band gaps at 1.48 and 2.19 eV); widely used as heterogeneous catalyst, 4 anode material in lithium ion batteries, 5 gas sensor, [6][7][8] electrochemical device, 9 solar energy absorber, 10 and magnetic material, 11 where their properties are strongly dependent on their size and morphology. Co 3 O 4 exhibits a normal spinel structure, in which the tetrahedral sites are occupied by Co 2+ and octahedral sites by Co…”

Section: Introductionmentioning

confidence: 99%

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Structural, optical, and magnetic properties of Mn and Fe-doped Co3O4 nanoparticles

2015

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Mn and Fe-doped Co3O4 nanoparticles were prepared by a simple precipitation method. The synthesized particles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and vibrating sample magnetometer (VSM) techniques. XRD analysis showed the cubic structure of Co3O4. SEM and TEM images confirmed the formation of interconnected nanoparticles. Mn and Fe-doped Co3O4 showed broad absorption in the visible region compared to undoped sample and the band gap values are red shifted. Five Raman active modes were observed from the Raman spectra. FTIR spectra confirmed the spinel structure of Co3O4 and the doping of Mn and Fe shifts the vibrational modes to lower wave number region. The magnetic measurements confirmed that Fe-doped Co3O4 shows a little ferromagnetic behavior compared to undoped and Mn-doped Co3O4, which could be related to the uncompensated surface spins and the finite size effects.

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Section: -7mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural, optical, and magnetic properties of Mn and Fe-doped Co3O4 nanoparticles

2015

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“…Cobalt(II,III) oxide, Co 3 O 4 , is a magnetic p-type semiconductor most often used as a heterogeneous catalyst, in Li-ion batteries or as a solid-state sensor [80,[87][88][89]. CVD has been used to improve the sensor performance by homogenous doping with fluorine, with F-doped Co 3 O 4 successfully grown at temperatures between 200 and 400˝C by plasma enhanced-chemical vapour deposition using single-source precursors, Co(dbm) 2 (where dbm = 1,3-Diphenyl-1,3-propanedione) and Co(hfa) 2 TMEDA (where hfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate and TMEDA = N,N,N',N'-tetramethylethylenediamine) respectively [90].…”

Section: Complex Oxidesmentioning

confidence: 99%

Chemical Vapour Deposition of Gas Sensitive Metal Oxides

et al. 2016

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This article presents a review of recent research efforts and developments for the fabrication of metal-oxide gas sensors using chemical vapour deposition (CVD), presenting its potential advantages as a materials synthesis technique for gas sensors along with a discussion of their sensing performance. Thin films typically have poorer gas sensing performance compared to traditional screen printed equivalents, attributed to reduced porosity, but the ability to integrate materials directly with the sensor platform provides important process benefits compared to competing synthetic techniques. We conclude that these advantages are likely to drive increased interest in the use of CVD for gas sensor materials over the next decade, whilst the ability to manipulate deposition conditions to alter microstructure can help mitigate the potentially reduced performance in thin films, hence the current prospects for use of CVD in this field look excellent.

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“…Metal oxide nanostructures are associated with several catalytic properties and are implemented to significantly improve electron-transfer processes with different types of solid electrodes designed Metal oxide nanostructures are associated with several catalytic properties and are implemented to significantly improve electron-transfer processes with different types of solid electrodes designed for detection of various analytes [11][12][13]. Among metal oxide nanostructures, CuO-NSs have been the focus of interest in sensor development due to their low cost, ease of preparation at relatively low temperatures, high stability and catalytic activity, and hence, rapid electron transfer kinetics.…”

Section: Introductionmentioning

confidence: 99%

Construction of an Ultrasensitive and Highly Selective Nitrite Sensor Using Piroxicam-Derived Copper Oxide Nanostructures

et al. 2018

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Abstract:In this work, piroxicam-based copper oxide nanostructures (Px-CuO NSs) were synthesized via hydrothermal precipitation in the presence of ammonia. The prepared Px-CuO NSs were subjected to scanning electron microscopy (SEM) and X-ray diffraction (XRD) to obtain morphology and crystallinity, respectively. The SEM study reveals that these Px-CuO NSs are in the form of porous rose-like nanopetals with dotted particles on their surface, while the XRD study confirms their crystalline nature. The Px-CuO NS-based sensors were fabricated by drop-casting them onto the surface of a glassy carbon electrode (GCE) and they were tested for nitrite detection using voltammetry and amperometry. The results show these Px-CuO NSs to be highly stable on the GCE surface with linear amperometric (current vs. time) responses to wide range of nitrite concentrations from 100 to 1800 nM, with limits of detection (LOD) and quantification (LOQ) being 12 nM and 40 nM, respectively. Importantly, the fabricated sensor showed negligible effects for a 10-fold higher concentration of common interfering agents and exhibited excellent selectivity. It was applied successfully for nitrite detection in water samples such as river water, mineral water, and tap water.

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C2H5OH sensing characteristics of various Co3O4 nanostructures prepared by solvothermal reaction

Cited by 175 publications

References 50 publications

Structural, optical, and magnetic properties of Mn and Fe-doped Co3O4 nanoparticles

Structural, optical, and magnetic properties of Mn and Fe-doped Co3O4 nanoparticles

Chemical Vapour Deposition of Gas Sensitive Metal Oxides

Construction of an Ultrasensitive and Highly Selective Nitrite Sensor Using Piroxicam-Derived Copper Oxide Nanostructures

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