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Designed functions of oxide/hydroxide nanosheets via elemental replacement/doping
Kanji Saito1,2, Masashi Morita3, Tomohiko Okada4
1Department of Materials Science, Graduate School of Engineering Science, Akita University, 1-1 Tegatagakuen-machi, Akita-shi, Akita 010-8502, Japan.
Chemical Society Reviews
|October 7, 2024
Summary
Elemental replacement in two-dimensional (2D) oxides and hydroxides, known as isomorphous substitution or doping, allows for tailored material properties. This review highlights unique preparation, characterization, and applications of these 2D materials.
Area of Science:
- Materials Science and Chemistry
- Nanotechnology
- Solid-State Physics
Background:
- Partial replacement of structural elements in solids (isomorphous substitution/doping) modifies properties and imparts functionality.
- This phenomenon is observed in nature (gemstones, clay minerals) and widely used in materials chemistry.
- Two-dimensional (2D) oxides and hydroxides offer unique advantages over bulk counterparts due to their facile synthesis and structural versatility.
Purpose of the Study:
- To summarize elemental replacement in 2D oxides and hydroxides, emphasizing their unique preparation, characterization, and applications.
- To discuss the design of layered materials, such as layered double hydroxides and silicates, via isomorphous substitution for specific properties.
- To explore the versatility of isomorphous substitution in layered transition metal oxides/hydroxides for tuning electronic structures and functionalities.
Main Methods:
- Review of literature on elemental replacement (isomorphous substitution, doping) in 2D oxides and hydroxides.
- Analysis of preparation and characterization techniques unique to 2D materials compared to bulk.
- Case studies on material design for photocatalytic applications using layered titanates and niobates.
Main Results:
- Elemental replacement in 2D oxides and hydroxides enables precise control over material properties like catalytic and adsorptive capabilities.
- Isomorphous substitution in layered double hydroxides, silicates, and clay minerals influences catalytic, adsorptive, and swelling properties.
- Tuning band structures, doping with holes/electrons, and creating impurity levels are achievable through elemental replacement in layered transition metal oxides/hydroxides.
Conclusions:
- Elemental replacement is a versatile strategy for designing functional 2D oxides and hydroxides with tailored properties.
- The unique characteristics of 2D materials facilitate advanced applications through controlled elemental substitution.
- Isomorphous substitution is crucial for developing next-generation materials, particularly for photocatalysis and ion exchange.
