Porous semiconductor chalcogenide aerogels.

Department of Chemistry, Wayne State University, Detroit, MI 48202, USA.
Science (Impact Factor: 33.61). 02/2005; 307(5708):397-400.
Source: PubMed


Chalcogenide aerogels based entirely on semiconducting II-VI or IV-VI frameworks have been prepared from a general strategy that involves oxidative aggregation of metal chalcogenide nanoparticle building blocks followed by supercritical solvent removal. The resultant materials are mesoporous, exhibit high surface areas, can be prepared as monoliths, and demonstrate the characteristic quantum-confined optical properties of their nanoparticle components. These materials can be synthesized from a variety of building blocks by chemical or photochemical oxidation, and the properties can be further tuned by heat treatment. Aerogel formation represents a powerful yet facile method for metal chalcogenide nanoparticle assembly and the creation of mesoporous semiconductors.

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    • "Mesoporous semiconductors have gathered substantial attention for their novel chemistry and potential applications due to their high surface-area and high surface-to-volume ratio [1] [2] [3] [4] [5]. Moreover ordered mesoporous semiconductor oxide materials have attracted increasing consideration particularly from the electrochemists due to their unique properties and functionalities that can be effectively exploited in electrochemical devices, photocatalysis, and electrocatalysis [6] [7] [8] [9]. "
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    Full-text · Article · Apr 2015 · Ceramics International
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    • "Of these methods, construction of nanocrystalline networks from preformed nanocrystals is attracting increasing interest. For instance, Au networks were prepared from Au particles by hydrothermally detaching surfactants [20], and CdS, ZnS, PbS, CdSe, and CdTe semiconductor networks (aerogels) were fabricated by partial oxidative ligand removal from nanoparticles synthesized in either aqueous or organic solution [21] [22]. PbSe nanocrystal networks have also been formed by the displacement of oleic acid ligands with pyridine [23]. "
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    ABSTRACT: Copper-based monolithic aerogel was prepared by sol–gel method with inorganic salt as precursor, the polyacrylic acid as template and the propylene oxide as gelation agent. The as-prepared aerogel was calcined at 400 °C to remove the organic substances and obtain crystalline copper-oxide nanostructured materials (tenorite, JCPDS File No. 00-045-0937). The aerogels’ structural properties were characterized by the field emission scanning electron microscopy, the high resolution transmission electron microscopy, the X-ray diffraction (XRD), and the Brunauer-Emmett-Teller methods. The results indicate that the as-prepared copper-based aerogel shows a typical three-dimensional porous structure with a large surface areas about 587 m2/g. The XRD patterns show that the as-prepared copper-based aerogel belongs to amorphous materials. The phase transition from the amorphous to crystalline copper oxide occurs at 400 °C.
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