Persimmon-like CaMoO4 micro/nanomaterials: A rapid microwave-assisted fabrication, characterization, and the growth mechanism

Sun, Yan; Li, Chunsheng; Zhang, Zhenyu; Ma, Xiaoqing; Wang, Lina; Wang, Yaozu; Song, Mingyang; Ma, Pei-Juan; Jiang, Liping; Guo, Yu

doi:10.1016/j.solidstatesciences.2011.11.015

Cited by 23 publications

(22 citation statements)

References 52 publications

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“…The silver molybdates can be obtained by different methods of synthesis [12][13][14][15][16][17][18][19][20][21][22][23][24][25] in various morphologies [26,15,27,28,7,29,20,30], which make this compound the subject of several investigations, including the study of structural transitions by means of differential thermal analysis (DTA) [2], X-ray diffraction (XRD) [27,6], Raman spectroscopy [1,27,6,31], surfaceenhanced Raman spectroscopy [27,28] and absorption and emission spectroscopy [6,28,32,7]. However, the room temperature structure of the Ag2MoO4 crystal exists in two different forms namely as α-Ag2MoO4 (tetragonal) and β-Ag2MoO4 (cubic) [33].…”

Section: Introductionmentioning

confidence: 99%

Phonon properties of β-Ag2MoO4: Raman spectroscopy and ab initio calculations

Moura

Filho

Freire

et al. 2016

Vibrational Spectroscopy

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Section: Introductionmentioning

confidence: 99%

Phonon properties of β-Ag2MoO4: Raman spectroscopy and ab initio calculations

Moura

Filho

Freire

et al. 2016

Vibrational Spectroscopy

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“…Recently, these disadvantages have been overcome by other synthetic methods. 6,7 The Ag 2 MoO 4 phase is obtained by the following chemical routes: controlled precipitation, 8,9 conventional hydrothermal (CH) technique, 10,11 and microwave-assisted hydrothermal (MAH) method. 12 In particular, both CH and MAH techniques received special recognition in the literature because of their unique characteristics, such as the use of water as solvent, low processing temperatures (≤200°C), and good control of particle sizes and shapes.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigations of Electronic Structure and Photoluminescence Properties of β-Ag₂MoO₄ Microcrystals

et al. 2014

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In this paper, we investigate a correlation between theoretical calculations and experimental data to explain the electronic structure and optical properties of silver molybdate (β-Ag 2 MoO 4 ) microcrystals synthesized by the microwave-assisted hydrothermal method. X-ray diffraction, Rietveld refinement, and micro-Raman spectroscopy confirmed that these microcrystals crystallize in a spinel-type cubic structure. Field-emission scanning electron microscopy images revealed that the processing temperatures influence in the final shape of microcrystals. Optical properties were analyzed by ultraviolet−visible diffuse reflectance spectroscopy; the increase in the optical band gap energy (E gap ) (from 3.24 to 3.31 eV) with processing temperature is associated with the reduction of intermediary energy levels. First-principles quantum mechanical calculations based on the density functional theory at the B3LYP level were conducted. The calculated band structure revealed an indirect E gap of approximately 4.00 and 3.34 eV for the β-Ag 2 MoO 4 without and with the formation of defects, respectively. Theoretical calculations based on density of states and electron density maps were employed to understand the polarization phenomenon induced by structural defects in the β-Ag 2 MoO 4 crystals. Finally, photoluminescence properties at room temperature of β-Ag 2 MoO 4 microcrystals were explained by the charge-transfer mechanism involving tetrahedral [MoO 4 ] clusters.

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“…scientific research and potential technological applications. All kinds of morphology of calcium molybdate have been successfully synthesized by using various methods, such as flowerlike, 12 erythrocyte-like, 13 persimmons-like, 14 and doughnut-like. 15 In many of the preparation process, different surfactants may be used to control morphology.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Optimum Luminescence of Doughnut-Shape Undoped and Doped CaMoO<SUB>4</SUB>

Lv¹,

Liu²,

Cong³

et al. 2014

j. nanosci. nanotech.

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In this work, we report the size and shape-controlled synthesis of CaMoO4 nanocrystals with an aim of investigate their structural, electronic, and luminescent properties. The samples were carefully characterized by X-ray diffraction, transmission electron microscopy, Fourier transformed infrared spectroscopy, UV-vis diffuse reflectance spectroscopy, and luminescence spectroscopy. It is found that when MoO4(2-) and Ca2+ were mixed at relatively low temperature (in ice salt bath), the reaction produces a uniform population of microparticles with an interesting "doughnut" shapes. Due to the low temperature, the process of crystal nucleus is slow enough to for separated growth. The intensity of the absorption band for CaMoO4 nanocrystals was greatly enhanced with the decrease reaction temperature. The as-prepared CaMoO4 doughnut phosphors reveal a broad emission with a maximum at 500 nm, which exhibit blue-green emission. We also study the luminescent property for Eu(3+)-doped CaMoO4. As for the Eu(3+)-doped samples (initial Ca2+:Eu3+ molar ratio 20:1), it is shown that Eu3+ was substituted at Ca2+ sites in the CaMoO4 host lattice, which favors energy transition between Eu3+ ions and molybdate groups that caused the decrease of strength of the peak in emission spectra.

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Persimmon-like CaMoO4 micro/nanomaterials: A rapid microwave-assisted fabrication, characterization, and the growth mechanism

Cited by 23 publications

References 52 publications

Phonon properties of β-Ag2MoO4: Raman spectroscopy and ab initio calculations

Phonon properties of β-Ag2MoO4: Raman spectroscopy and ab initio calculations

Experimental and Theoretical Investigations of Electronic Structure and Photoluminescence Properties of β-Ag₂MoO₄ Microcrystals

Synthesis and Optimum Luminescence of Doughnut-Shape Undoped and Doped CaMoO<SUB>4</SUB>

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Persimmon-like CaMoO4 micro/nanomaterials: A rapid microwave-assisted fabrication, characterization, and the growth mechanism

Cited by 23 publications

References 52 publications

Phonon properties of β-Ag2MoO4: Raman spectroscopy and ab initio calculations

Phonon properties of β-Ag2MoO4: Raman spectroscopy and ab initio calculations

Experimental and Theoretical Investigations of Electronic Structure and Photoluminescence Properties of β-Ag2MoO4 Microcrystals

Synthesis and Optimum Luminescence of Doughnut-Shape Undoped and Doped CaMoO<SUB>4</SUB>

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Experimental and Theoretical Investigations of Electronic Structure and Photoluminescence Properties of β-Ag₂MoO₄ Microcrystals