Preparation of gas sensing CoTiO3 nanocrystallites using EDTA as the chelating agent in a sol–gel process

Lu, Jing; Jiang, Yucheng; Zhang, Yabin; Huang, Jianfeng; Xu, Zhanwei

doi:10.1016/j.ceramint.2014.11.044

Cited by 33 publications

(7 citation statements)

References 27 publications

(34 reference statements)

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“…The grain sizes of nickel nanoparticles inFig. 2c and 2dare almost the same7 as those inFig. 2a, meaning that grain growth does not occur in the temperature range of 623-823 K.…”

mentioning

confidence: 71%

“…Homogeneous mixing can be accomplished by combination of chemicals with chelating agents in aqueous or organic solutions [5]. Citric acid (CA) and ethylene diamine tetraacetic acid (EDTA) are often operated as chelating agents in aqueous solution for the preparation of materials [5][6][7] due to the strong chelating capacity of CA and EDTA.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of nickel and Ni3Sn nanoparticles via extension of conventional citric acid and ethylene diamine tetraacetic acid mediated sol–gel method

Deng

Guo

et al. 2016

Journal of Alloys and Compounds

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This work aims to extend the application field of sol-gel process from conventional oxides, carbides, sulfides to metallic nanocrystalline materials. Metallic ions were coordinated with chelating agents of citric acid (CA) and ethylene diamine tetraacetic acid (EDTA) in aqueous solution. Then the solutions were dried at 383 K, resulting in the formation of sol and gel. Heating treatments of dried gels were then carried out with protection of N 2 atmosphere. Ni and Ni 3 Sn alloy nanoparticles were obtained by this sol-gel method in the range of 623-823 K. The as-prepared Ni and Ni 3 Sn alloy nanoparticles have average grain sizes of 15 and 30 nm, and have face-centred-cubic (fcc) crystalline phase. Our results provide new insight into the application of conventional sol-gel method.

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“…The grain sizes of nickel nanoparticles inFig. 2c and 2dare almost the same7 as those inFig. 2a, meaning that grain growth does not occur in the temperature range of 623-823 K.…”

mentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Preparation of nickel and Ni3Sn nanoparticles via extension of conventional citric acid and ethylene diamine tetraacetic acid mediated sol–gel method

Deng

Guo

et al. 2016

Journal of Alloys and Compounds

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“…The d‐spacings of 0.25, 0.27, and 0.37 nm were assigned to (110), (104), and (012) planes of ilmenite CoTiO 3 , respectively. [ 48–50 ]…”

Section: Resultsmentioning

confidence: 99%

Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response

Liu

Shi

et al. 2020

Adv Funct Materials

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A colloidal-amphiphile-templated growth is developed to synthesize mesoporous complex oxides with highly crystalline frameworks. Organosilane-containing colloidal templates can convert into thermally stable silica that prevents the overgrowth of crystalline grains and the collapse of the mesoporosity. Using ilmenite CoTiO 3 as an example, the high crystallinity and the extraordinary thermal stability of its mesoporosity are demonstrated at 800 °C for 48 h under air. This synthetic approach is general and applicable to a series of complex oxides that are not reported with mesoporosity and high crystallinity, such as NiTiO . Those novel materials make it possible to build up correlations between mesoscale porosity and surfacesensitive physicochemical properties, e.g., electromagnetic response. For mesoporous CoTiO 3 , there is a 3 K increase of its antiferromagnetic ordering temperature, compared with that of nonporous one. This finding provides a general guideline to design mesoporous complex oxides that allow exploring their unique properties different from bulk materials.complex oxides, in general, has associated kinetic barriers from the slow diffusion in solids. [15] When there are two metal cations involved in crystallization of complex oxides like ABO 3 , their nonuniform distribution can result in spontaneous phase separation to form simple oxides. [16] A delicate balance of their sol-gel rates and the precautious control of thermal annealing procedure is needed. On the other hand, ordering competition between the crystallization of oxides and the mesoscale porosity brings profound difficulties to synthesize complex oxides (e.g., perovskites and ilmenites) with mesoporous structures. Crystallization usually leads to the formation of large crystalline grains that will create strong interfacial energies between crystalline walls and pores (e.g., air or templates). For any templated growth of mesoporous oxides using hydrocarbon-based surfactants or block copolymers (BCPs) as soft templates, [17][18][19] mesoscale nanostructures collapse prior to the crystallization of oxides, [20][21][22] because these soft templates are not mechanically strong and thermally stable under elevated temperatures (i.e., >500 °C).Nanostructures show a profound impact on the magnetic properties of materials as well and a few theoretical models have been proposed to understand magnetic behavior of nanoscale particles. [23][24][25][26][27][28][29][30] The magnetic ordering temperature (Curie temperature or Néel temperature) in magnetic materials

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“…In particular, spray pyrolysis is a continuous synthesis process for the fabrication of the desired particles without the formation of medium materials. A low reaction temperature for the synthesis of FeAl 2 O 4 particles can be obtained to control the chelate reagents, such as citric acid (CA), ethylene diamine tetraacetic acid (EDTA) and ethylene glycol (EG) [15,16]. In addition, the spray pyrolysis process can be used to fabricate the desired particles easily and to allow large-scale production.…”

Section: Introductionmentioning

confidence: 99%

Preparation of iron aluminate (FeAl2O4) nanoparticles from FeAl2O4 hollow particles fabricated by using a spray pyrolysis process

Yun

Kim

Park

et al. 2015

Journal of the Korean Physical Society

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Iron aluminate (FeAl2O4) hollow particles with a spinel structure were synthesized by using a spray pyrolysis process. FeAl2O4 hollow particles were formed at a reaction temperature of 900 • C at a flow rate of 40 L/min as a result of the rapid solvent evaporation and decomposition gases from the droplets in the spray solution prepared from metal salts and organic reagents. FeAl2O4 hollow particles were fabricated at a reaction temperature of 900 • C with a flow rate of 40 L/min. The FeAl2O4 hollow particles were heat treated for 3 hours at 600 • C in a 5% H2/Ar atmosphere to form the crystal particles. Subsequently, FeAl2O4 nanoparticles were fabricated from the FeAl2O4 hollow particles by using the wet milling process. After milling for 60 minutes, transmission electron microscopy revealed the FeAl2O4 particles to have a mean size of approximately 50 nm. The FeAl2O4 nanoparticles were fabricated successfully by using a two-step process, spray pyrolysis and wet milling.

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Preparation of gas sensing CoTiO3 nanocrystallites using EDTA as the chelating agent in a sol–gel process

Cited by 33 publications

References 27 publications

Preparation of nickel and Ni3Sn nanoparticles via extension of conventional citric acid and ethylene diamine tetraacetic acid mediated sol–gel method

Preparation of nickel and Ni3Sn nanoparticles via extension of conventional citric acid and ethylene diamine tetraacetic acid mediated sol–gel method

Crystalline Mesoporous Complex Oxides: Porosity‐Controlled Electromagnetic Response

Preparation of iron aluminate (FeAl2O4) nanoparticles from FeAl2O4 hollow particles fabricated by using a spray pyrolysis process

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