Self-assembly of structured CeCO3OH and its decomposition in H2 for a novel tactic to obtain CeO2- with excellent photocatalytic property

Mao, Xisong; Xia, Xuewen; Li, Junqi; Chen, Chaoyi; Gu, Xiaoying; Li, Song; Lan, Yuanpei

doi:10.1016/j.jallcom.2021.159424

Cited by 25 publications

(8 citation statements)

References 83 publications

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“…As shown in Figure , the weight loss before 200 °C was attributed to the removal of free water or adsorbed water, while the significant weight loss from 200 to 400 °C was attributed to the decomposition of the mixed-phase cerium compound samples. , The total weight loss between 200 and 400 °C first increased and then remained basically unchanged with an extension of the reaction time, corresponding to the transformation of the dominant phase of the product from CeO 2 to Ce(HCOO)C 2 O 4 , Ce(HCOO) 3 , and Ce(OH)CO 3 . The theoretical weight loss values of CeO 2 , Ce(HCOO)C 2 O 4 , Ce(HCOO) 3 and Ce(OH)CO 3 can be calculated from the following reactions: .25ex2ex CeO 2 → CeO 2 Δ m = 0 % .25ex2ex 4 Ce false( HCOO false) C 2 O 4 + 5 O 2 → 4 CeO 2 + 12 CO 2 + 2 H 2 O Δ m = 37.0 % .25ex2ex 4 Ce ( HCOO ) 3 + 7 O 2 → 4 CeO 2 + 12 CO 2 + 6 H…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO₃ and Its Thermal Conversion to Ceria with High Polishing Performance

Gui-hua

et al. 2023

ACS Omega

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Layered quasi-triangular Ce(OH)CO 3 assembled from primary nanoparticles was synthesized via a solvothermal method and converted into CeO 2 abrasive particles by calcination at 800−1000 °C. With the increase of calcination temperature, the primary particle size increased and the microstructure, mechanical hardness, and chemical activity of the CeO 2 particles changed, thus affecting the polishing performance. The calcined products obtained at 800, 850, and 900 °C maintained the layered edge structure of the Ce(OH)CO 3 precursor and had a relatively high specific surface area and surface Ce 3+ concentration. The samples calcined at 950 and 1000 °C lost the layered structure due to the large-scale melting of the primary particles, and their surface chemical activity decreased. The polishing experiments on K9 glass showed that, with the calcination temperature rising from 800 to 1000 °C, the material removal rate (MRR) first increased and then decreased sharply. The initial increase of MRR was attributed to the increase of mechanical hardness of the layered quasi-triangular CeO 2 , and the subsequent decrease of MRR was related to the decrease in surface chemical activity and disappearance of the layered edge structure. The product calcined at 900 °C had the highest MRR and best surface quality after polishing due to the layered edge structure and optimal match of chemical activity and mechanical hardness.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO₃ and Its Thermal Conversion to Ceria with High Polishing Performance

Gui-hua

et al. 2023

ACS Omega

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“…Moreover, the characteristic peak position of 11.81 at.% Ce‐doped sample did not shift significantly compared with that of 8.93 at.% sample, which reveals no increase of Ce as substitutional atoms in Ti 4 O 7 (Figure 4A). When the Ce content reaches up to 15.05 at.%, only CeO 2 characteristic peaks located at 461.8 cm −1 (F 2g ) caused by the symmetric vibration of Ce–8O appeared due to its excessive peak intensity 57,58 (Figure 4A). The typical Raman peak of CeO 2 is located at 464 cm −1 , and the redshift of the F 2g results from lattice expansion due to oxygen vacancy and electron reduction 59,60 …”

Section: Resultsmentioning

confidence: 99%

“…The oxygen content in two samples was calculated according to Equations ( 7) and ( 8), which gave valence states of Ti, Ti +3.53 in the pristine one, and Ti +3. 57…”

Section: Lattice Parameters Samplementioning

confidence: 99%

Structural and electronic properties of Ce‐doped Ti₄O₇ based on experiments and first‐principles calculations

Wei,

Jin,

2023

J Am Ceram Soc.

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A series of Ti4O7 powders with different Ce‐cation doping concentrations were successfully prepared through a new strategy combining the wet chemical method and hydrogen thermal reduction. It is shown that Ce, entering the lattice of Ti4O7 during the reduction process, only occurs in the form of Ce3+, and the solubility of Ce is equal to 8.93 at.%. Furthermore, the electrical conductivity of Ce‐doped Ti4O7 powders was tested for the first time and theoretically explained by the first‐principles calculations. It was revealed that Ce provides a negative effect on the electrical conductivity of Ti4O7 powders, which is due to the decrease in the number of electronic states near the Fermi energy level caused by the introduction of Ce.This article is protected by copyright. All rights reserved

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“…Currently, precipitation and hydrothermal methods are prevalent. In the preparation process, lower concentrations (below 0.1 M) and template agents or surfactants are typically used to achieve a specific morphology and a uniform distribution of CeO 2 [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis of Triangular Submicron-Sized CeO2 and Its Polishing Performance

Wang,

Zhang

et al. 2024

Materials

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CeO2 is widely used in the field of chemical–mechanical polishing for integrated circuits. Morphology, particle size, crystallinity, and Ce3+ concentration are crucial factors that affect polishing performance. In this study, we successfully synthesized two novel triangular CeO2 abrasives with similar particle sizes (600 nm) but different morphologies and Ce3+ concentrations using a microwave-assisted hydrothermal method with high-concentration raw materials, and no surfactants or template agents were added. It is generally believed that CeO2 with a higher Ce3+ concentration leads to better polishing performance. However, the results of polishing indicate that CeO2 synthesized at 200 °C, despite its lower Ce3+ concentration, demonstrates outstanding polishing performance, achieving a polishing rate of 324 nm/min, and the Sa of Si wafers decreased by 3.6% after polishing. This suggests that, under similar particle size conditions, the morphology of CeO2 plays a dominant role in the mechanical effects during the polishing process. Additionally, compared to commercial polishing slurries, the synthesized samples demonstrated better polishing performance. This indicates that, in CMP, the pursuit of smaller spherical abrasives may not be necessary. Instead, the appropriate shape and particle size can better balance the material removal rate and surface roughness.

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Self-assembly of structured CeCO3OH and its decomposition in H2 for a novel tactic to obtain CeO2- with excellent photocatalytic property

Cited by 25 publications

References 83 publications

Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO₃ and Its Thermal Conversion to Ceria with High Polishing Performance

Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO₃ and Its Thermal Conversion to Ceria with High Polishing Performance

Structural and electronic properties of Ce‐doped Ti₄O₇ based on experiments and first‐principles calculations

Controlled Synthesis of Triangular Submicron-Sized CeO2 and Its Polishing Performance

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Self-assembly of structured CeCO3OH and its decomposition in H2 for a novel tactic to obtain CeO2- with excellent photocatalytic property

Cited by 25 publications

References 83 publications

Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO3 and Its Thermal Conversion to Ceria with High Polishing Performance

Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO3 and Its Thermal Conversion to Ceria with High Polishing Performance

Structural and electronic properties of Ce‐doped Ti4O7 based on experiments and first‐principles calculations

Controlled Synthesis of Triangular Submicron-Sized CeO2 and Its Polishing Performance

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Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO₃ and Its Thermal Conversion to Ceria with High Polishing Performance

Synthesis of Hierarchical Layered Quasi-Triangular Ce(OH)CO₃ and Its Thermal Conversion to Ceria with High Polishing Performance

Structural and electronic properties of Ce‐doped Ti₄O₇ based on experiments and first‐principles calculations