Progress in Solid State Chemistry最新文献

Oxides such as BaAl₁₂O₁₉ and BaAl₂O₄ in the BaO–Al₂O₃ system demonstrate potential for optical applications due to the abundant tetrahedral and octahedral sites in their structures, as well as their high thermal stability, good chemical stability, high surface area and strong light absorption capacity. Rare earth element doping or transition metal ion doping in oxides in the BaO–Al₂O₃ system contributes to promising photoluminescent, visible color and catalytic properties. In this review, the structures of BaAl₁₂O₁₉, BaAl₂O₄, Ba₃Al₂O₆, Ba₄Al₂O₇, and Ba₇Al₂O₁₀ in the BaO–Al₂O₃ system are introduced. Their applications in phosphors, pigments and catalysts are also summarized herein.

A strong electrocatalytic activity of the MXenes nanomaterials (NMs) has gained a lot of concentration as cutting edge materials in a variety of electrocatalytic devices in a broad range of industrial uses. In recent years, the production and utilization of the MXenes NMs as an electrocatalysts has progressed, with more than 50 distinct variants found and used. We reviewed and discussed in this article the latest detail progress in the synthesis, selected properties and potential applications of the MXenes as an electrocatalysts for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), overall water splitting, oxygen reduction reaction (ORR), nitrogen reduction reaction (N₂RR), CO₂ reduction reaction (CO₂RR) etc. We will also discuss the numerous approaches for increasing MXenes electrocatalytic activity for target products. At the end, we will also talk about the present obstacles and future suggestions for the MXenes as HER, ORR, OER, NO₂RR and CO₂RR electrocatalysts.

Structural modification of titanium dioxide has offered a novel template to develop advanced functional materials which demonstrate visible light photocatalytic activity. There had been many attempts to modify the band gap of TiO₂ in order to realize its potential as an antimicrobial material in food coatings and packaging. This review gathers most recent advancements of developing TiO₂ based functional nanohybrids which include doping with metals, non-metals, co-doping, and development of hybrids with 2-D nanomaterials. In particular, nanohybrids prepared with of TiO₂ with graphene incorporation has opened up a novel platform to reduce the band gap while minimizing the inherent drawback of electron pair recombination in TiO₂. In this review, critical analysis of the recent literature on the mechanisms involved in structural modifications are discussed broadly and the electronic and functional properties of resulting materials are presented with a greater scientific depth. In addition, the available structural modification techniques have been compared with a particular emphasis on food preservation and post-harvest loss mitigation applications. More importantly, an outlook on the industrial applications, future directions and challenges have been suggested and discussed.

As is well known, Dy-doped crystals are capable of exhibiting yellow emission in the range of 570–590 nm. Owing to their potential use in the fields of biomedical instruments, optical storage, precision measurements, illumination displays, Bose–Einstein condensation, etc., Dy-activated yellow luminescent crystals have attracted considerable attention. In recent years, due to the widespread use of light-emitting diodes, considerable progress has been made on InGaN/GaN-based blue laser diodes (LDs), which provide a new approach for rare-earth-ion-activated crystals to obtain yellow lasers in one step. This has become a hot topic in the scientific and technological research communities and has prompted the development of research on yellow lasers. Based on Dy-doped crystals, we first summarize the research results and progress that has been made to achieve yellow emission in one step using the blue LD pumping technology. Besides, the prospect of obtaining yellow emission from Dy-activated crystals is also presented. Finally, this review aims to help researchers to further develop Dy-activated crystals with yellow emission under the excitation of blue LDs.

Ferrites crystallize in a variety of different structure types, which, although their formulas may at first appear to be too complex to understand intuitively, are in fact built from the stacking of only a handful of simple building blocks. Ferrites without iron, in contrast to the well-known iron-based ferrites, remain understudied, although many family members with distinctive structural and physical properties are known. This review briefly introduces the solid-state chemistry of ferrite compounds, primarily describing their crystal structures, followed by a summary of the reported structure-property relations of the iron-free members of this large family of materials. We also consider beta aluminas to be members of the iron-free ferrite structure family and describe them here.

Different phosphors emit different wavelengths of light depending upon the doped impurity ions. They have various applications in the technological fields. Therefore, the majority of research is accelerated in terms of energy saving and eco-friendly devices. The enormous and countless research in the aluminate materials have shape up the new era of solid state lighting in terms of illumination, small size, energy saving, long lasting eco-friendly phosphors, etc. Aluminates are the low cost and easily available materials and have the potential to fulfill almost all the properties that are required for illumination. The scientists have accelerated progressively more economical techniques, which are useful for technological advancement as well as mass production of the materials. This article highlights the recent development in aluminate materials in terms of their synthesis process, investigation in crystal structure, crystal field splitting and effect of energy band gap along with luminescence properties and lifetime measurements. Some of the earlier investigations showed the limitations and recent critically challenged investigations have also been discussed in this article. This article also includes various applications of these aluminate materials.

A monolayer of black phosphorus (BP), commonly known as phosphorene is a novel member of the two-dimensional (2D) materials family. In consequence of its “puckered” lattice structure, phosphorene has a larger surface to volume ratio than graphene and transition metal dichalcogenides (TMDCs), and has revealed some distinct benefits in sensing applications. Since, its first synthesis in 2014 by mechanical exfoliation has spurred a wave of material science research activity. Phosphorene's structure and anisotropic characteristics, with its applications in transistors, batteries, solar cells, disease theranostics and sensing has been the subject of several reviews. This pursuit has sparked a flurry of new areas of research, theoretical and experimental, targeted at technological breakthroughs. The target of this review is to explain current advances in phosphorene synthesis, properties, and sensing applications, such as gas sensing, humidity sensing, photo-detection, bio-sensing, and ion-sensing. Finally, we will discuss the present obstacles and potential for phosphorene synthesis, properties and sensing applications.

Layered hydroxide salts (LHS) are synthetic and natural materials with the general chemical composition M²⁺(OH)_2−x(A^m−)_x/m (M²⁺ is a divalent cation, normally Mg²⁺, Ni²⁺, Zn²⁺, Ca²⁺, Cd²⁺, Co²⁺or Cu²⁺, and (A^m−)_x/m·nH₂O is a hydrated counter-ion). In most of the cases, the LHS structures are based on the modification of the layered magnesium hydroxide-like structure (brucite, Mg(OH)₂), in which part of the structural hydroxide groups (OH⁻) from the Mg²⁺centered octahedra sharing edges are replaced by water molecules or anions. This process creates a net positive charge in the layers, which needs to be compensated with the intercalation/grafting of hydrated anions. Despite LHS versatility and having great potential for academic and industrial applications due to the variable chemical compositions, structures, and properties, this material is less explored in the literature. In the present review, the structures of the majority of the LHS materials are described and their potential applications are discussed, emphasizing their usage as supports for metalloporphyrins and utilization in different catalytic reactions.

The emergence of new two-dimensional materials (2DMs), especially the monoelemental materials (Xenes), in various fields of technology for their uses has shown potential nature, additionally, to fundamental science, addressing the new discoveries. The 2DMs Xenes (e.g., Group-IIIA (Borophene (2D-B), Gallenene (2D-Ga), and Aluminene (2D-Al)) Group-IVA (Silicene (2D-Si), Germanene (2D-Ge), Stanene (2D-Sn), and Graphene (2D-G)), Group-VA (Phosphorous (2D-P), Arsenene (2D-As), Antimonene (2D-Sb), and Bismuthene (2D-Bi)), Group-VIA (Tellurene (2D-Te) and Selenene(2D-Se)) for synthetic exploration are chemically tractable materials as considered capable mediators for biomedical applications due to their outstanding chemical, physical, optical and electronic properties, as well as in more than a number of other new bio-uses. In this timely updated review, we explained in detail the categorization of 2D-Xenes derived from their bulkiness properties. We also summarized the modification in synthetic methods of 2D-Xenes as well as their general properties. Moreover, for different biomedical uses the representative 2D-Xenes nanoplatforms are highlighted. At the end of this review, 2D-Xenes in the biomedicines research progress, perspectives, and challenges are discussed.

Rare-earth metal doped barium zirconate (RE⁺-BaZrO₃) materials are ionic and electronic conductors currently showing double functions in the protonic ceramic fuel cells (PCFCs). Specifically, RE⁺-BaZrO₃ are relevant as electrode and electrolyte for PCFCs. They have appreciable electron-ionic conductivity (e⁻/H⁺/O²⁻) at moderate temperature (≥500 °C) making them a better choice when compared to other perovskites. However, in these materials (RE⁺-BaZrO₃), challenges such as weak proton uptake and insufficient catalytic sites still exist and need to be addressed. From physic-chemical perspectives, improvement can be made possible through deeper understanding of proton uptake mechanism and catalytic sites resulting from structure engineering_. Based on that, this review focuses on importance of synthesis application for tuning the structural properties of RE⁺-BaZrO₃ materials, and hence enhances their current performances. The current advances made through material modification are discussed too. The main emphasis and discussions are on RE⁺-BaZrO₃ material design as electrode and electrolyte for PCFCs. The reaction mechanisms associated with the material proton uptakes are explicitly discussed. Putting all relevant analytical results into consideration, the primary approaches to improve the performance of the electrode and electrolyte-based on RE⁺-BaZrO₃ materials are indicated.