Abstract:Chalcogenide aerogels (chalcogels) are amorphous structures widely known for their lack of localized structural control. This study, however, demonstrates a precise multiscale structural control through a thiostannate motif ([Sn2S6]4−)-transformation-induced self-assembly, yielding Na-Mn-Sn-S, Na-Mg-Sn-S, and Na-Sn(II)-Sn(IV)-S aerogels. The aerogels exhibited [Sn2S6]4−:Mn2+ stoichiometric-variation-induced-control of average specific surface areas (95–226 m2 g−1), thiostannate coordination networks (octahedra… Show more
“…The homogeneous and self‐sustainable dark wet gel of NaMnSnS maintained its volume after solvent exchange and critical‐point drying (Figure 29A). 92 NMSC‐1, the resulting 2D crystalline chalcogel, displayed sharp diffraction peaks similar to those observed in KMS‐1. NMSC‐3, on the other hand, exhibited broad peaks due to a rapid kinetic cross‐linking reaction, resulting in a significantly amorphous structure (Figure 29B).…”
Porous metal chalcogenides have emerged as promising materials for environmental remediation and sustainable energy generation. Their tunable optical band gap (from infrared to the visible range), highly polarizable surface, chemical activity, and adjustable structure make them attractive for various applications. This review summarizes the recent developments concerning the synthesis and characterization of multifunctional porous chalcogenide materials. It explores their remarkable potential in addressing environmental and energy challenges. Moreover, we discuss the several factors that affect the performance of porous metal chalcogenides, such as their microstructure, morphology, and chemical composition, to gain deeper insights into these materials. Finally, we highlight some of the key challenges and future research directions in the development of porous metal chalcogenides as effective and efficient materials for environmental remediation and sustainable energy generation.image
“…The homogeneous and self‐sustainable dark wet gel of NaMnSnS maintained its volume after solvent exchange and critical‐point drying (Figure 29A). 92 NMSC‐1, the resulting 2D crystalline chalcogel, displayed sharp diffraction peaks similar to those observed in KMS‐1. NMSC‐3, on the other hand, exhibited broad peaks due to a rapid kinetic cross‐linking reaction, resulting in a significantly amorphous structure (Figure 29B).…”
Porous metal chalcogenides have emerged as promising materials for environmental remediation and sustainable energy generation. Their tunable optical band gap (from infrared to the visible range), highly polarizable surface, chemical activity, and adjustable structure make them attractive for various applications. This review summarizes the recent developments concerning the synthesis and characterization of multifunctional porous chalcogenide materials. It explores their remarkable potential in addressing environmental and energy challenges. Moreover, we discuss the several factors that affect the performance of porous metal chalcogenides, such as their microstructure, morphology, and chemical composition, to gain deeper insights into these materials. Finally, we highlight some of the key challenges and future research directions in the development of porous metal chalcogenides as effective and efficient materials for environmental remediation and sustainable energy generation.image
“…The work by Kim and colleagues suggests that there is direct connection between crystalline framework and amorphous chalcogels 3 . A porous chalcogenide framework materials, featuring the self-assembly of two-dimensional building block in a highly active three-dimensional interconnected network, will arouse great attention in the near future.…”
Section: Discussionmentioning
confidence: 99%
“…3.). Specifically, by using the manganese linker and thiostannate motif, the crystalline layer structure assembly could be induced in the resultant Na-Mn-Sn-S chalcogels via slow gelation process 3 . Varying the Mn amounts, the structural transformation control could be accomplished from crystalline to amorphous nature.…”
Chalcogenide aerogels are receiving widespread attention due to their unique properties. Here we comment on a recent work about amorphous Na–Mn–Sn–S chalcogels featuring local structural control, and provide an outlook for the development of chalcogels and the metal-organic sulfide framework.
“…Alternative synthesis methods were developed to address the aforementioned issues. They use low temperatures to increase the predictability of reaction products and stabilize structures that cannot be obtained through high-temperature solid-state reactions. − Representative examples are highly successful flux synthesis using alkali metal chalcogenides , and metals, − hydro-/solvothermal reactions, − metathesis reactions, − and the recently developed mixed hydroxide halide fluxes. , For example, inorganic fluxes melt at lower temperatures and form liquid serving as a reaction medium like organic solvents in molecular synthesis, and frequently participate in reactions. Accordingly, central atoms have a better chance to assemble building blocks that are not available in a high-temperature solid-state synthesis.…”
The ability to manipulate crystal structures using kinetic
control
is of broad interest because it enables the design of materials with
structures, compositions, and morphologies that may otherwise be unattainable.
Herein, we report the low-temperature structural transformation of
bulk inorganic crystals driven by hard–soft acid–base
(HSAB) chemistry. We show that the three-dimensional framework K2Sb8Q13 and layered KSb5Q8 (Q = S, Se, and Se/S solid solutions) compounds transform
to one-dimensional Sb2Q3 nano/microfibers in
N2H4·H2O solution by releasing
Q2– and K+ ions. At 100 °C and ambient
pressure, a transformation process takes place that leads to significant
structural changes in the materials, including the formation and breakage
of covalent bonds between Sb and Q. Despite the insolubility of the
starting crystals in N2H4·H2O under the given conditions, the mechanism of this transformation
can be rationalized by applying the HSAB principle. By adjusting factors
such as the reactants’ acid/base properties, temperature, and
pressure, the process can be controlled, allowing for the achievement
of a wide range of optical band gaps (ranging from 1.14 to 1.59 eV)
while maintaining the solid solution nature of the anion sublattice
in the Sb2Q3 nanofibers.
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