Abstract
We describe a one-pot synthesis method for carbon filament-supported mixed metal oxide nanoparticles. The thermal intracrystalline reaction of adamantanecarboxylate ions confined inside interlayer galleries of layered double hydroxide materials under a reducing atmosphere (H2) leads to carbon filaments forming in situ within the material. Raman spectroscopy and combined microscopy techniques show the formation of hybrid organic–inorganic carbon filaments with the mixed metal oxide particles interleaved.
Highlights
Intracrystalline reactions are a well-known phenomenon in layered materials.[1]
The synthesized adamantanecarboxylate was characterized by powder X-ray diffraction (PXRD), with a typical diffraction pattern shown in Figure S1 (Supporting Information)
The elemental composition of the Mixed metal oxides (MMOs) was determined by energy-dispersive X-ray (EDX), with the results shown in Figure S8 (Supporting Information)
Summary
Intracrystalline reactions are a well-known phenomenon in layered materials.[1]. Due to host−guest interactions and the confined structure, dynamics and reactivity of the interlayer region, graphite,[2,3] cationic aluminosilicate clay minerals,[4,5] metal phosphonates,[6−8] and metal chalcogenides[9,10] have all been used to enable and control different kinds of intracrystalline reactions to develop novel functional materials, as well as to control the stereochemistry of reacting interlayer guests.[11,12] The confining interlayer galleries, often only one or two molecule lengths in height, of host layered solids are an ideal place to prepare guest nanomaterials, delivering multifunctionality to the host−guest structure.[13]. Received: August 8, 2019 Accepted: October 29, 2019 Published: November 20, 2019 These supported MMOs are found to be better than unsupported MMOs for various applications such as gas adsorption, organic conversions, and electrode materials for batteries and supercapacitors.[36−42] Generally, all these methods are multistep and add significant cost to the life cycle of the materials. All these supports are provided as additives during/after the synthesis and result in less even distribution of the catalyst on the support. Mg-Al LDHs intercalated with adamantanecarboxylic acid were synthesized by employing an efficient one-pot protocol as described in our previous paper showing excellent thermal stability.[45]
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