Solution‐Based Synthesis Routes for the Preparation of Noncentrosymmetric 0‐D Oxide Nanocrystals with Perovskite and Nonperovskite Structures

Abstract

With the miniaturization of electronic‐based devices, the foreseen potential of new optical nanoprobes and the assessment of eventual size and shape effects, elaboration of multifunctional noncentrosymmetric nanocrystals with ferroelectric, pyroelectric, piezoelectric, and nonlinear optical properties are the subject of an increasing research interest. Here, the recent achievements from the solution‐based methods (coprecipitation in homogeneous and nanostructured media, sol‐gel processes including various chemistries and hydro/solvothermal techniques) to prepare 0‐D perovskite and nonperovskite oxides in the 5–500 nm size range are critically reviewed. To cover a representative list of covalent‐ and ionic‐type materials, BaTiO3 and its derivatives, niobate compounds (i.e., K/Na/LiNbO3), multiferroic BiFeO3, and crystals of lower symmetry including KTiOPO4 and some iodate compounds such as Fe(IO3)3 and La(IO3)3 are systematically in focus. The resulting size, morphology, and aggregation state are discussed in light of the proposed formation mechanisms. Because of a higher complexity related to their chemical composition and crystalline structures, improving the rational design of these multifunctional oxides in terms of finely‐tuned compositions, crystalline hosts and structure–property relationships still need in the future a special attention of the research community to the detailed understanding of the reaction pathways and crystallization mechanisms.

Black Gold Plasmon Response of a Raspberry Shell Grown on Lithium Niobate Nonlinear Nanoparticles

“…The whole synthesis protocol of LN@Au synthesis is detailed in the Supporting Information and in previous papers. , Briefly, LN NPs with a typical diameter of 45 nm were synthesized by a nonaqueous solvothermal alkoxide process. , Addition of the branched polyethylenimine (BPEI) polymer in colloidal suspensions was used to coat the LN NPs and change the initial negative surface charge of LN to positive. Negatively charged Au seeds (AuSeeds) were synthesized using the protocol reported by Duff et al AuSeeds were then attached onto LN@BPEI NPs via electrostatic interactions with a theoretical ratio of the number of AuSeeds to LN NPs fixed at 1000:1.…”

A DFT study on CH3NH3MnBr3: a novel multiferroic organic–inorganic hybrid perovskite

“…Recently, the coupling between magnetic and ferroelectric order parameters opens up possibilities for various applications in multifunctional novel devices, i.e., spintronics, multistate data storage, magnetic filters, and magnetoelectric sensors. [1][2][3][4] Unfortunately, single-phase multiferroic materials are very rare due to their mutual chemical and electronic incompatibility. 5 Hence, the search for new multiferroic materials is a critical and pressing issue.…”

“…, spintronics, multistate data storage, magnetic filters, and magnetoelectric sensors. 1–4 Unfortunately, single-phase multiferroic materials are very rare due to their mutual chemical and electronic incompatibility. 5 Hence, the search for new multiferroic materials is a critical and pressing issue.…”

Mesoporous RE0.5Ce0.5O2–x Fluorite Electrocatalysts for the Oxygen Evolution Reaction

“…1,17,18 Wet chemistry-based synthesis methods such as EISA allow for intimate mixing of cations prior to calcination and can be used to achieve target phases at lower temperatures relative to solid state methods due to increased diffusion kinetics of the cations in solution. 19 The lower calcination temperature associated with EISA also facilitates the synthesis of nanosized particles, which exhibit much larger total exposed SAs than their bulk counterparts and an increased number of catalytically active sites. Additionally, surface accessible porosity, which can be engineered using EISA, can improve the diffusion rates of reactants to and products from active sites.…”