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Role of annealing atmosphere on the crystal structure and composition of tetrahedrite–tennantite alloy nanoparticles

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Abstract

Tetrahedrite–tennantite (TET–TEN, Cu12Sb4S13–Cu12As4S13) nanoparticle (NP) alloys spanning the entire Sb–As composition range were synthesized using a hot-injection method without any detectable impurities. Thin films of TET–TEN NPs were prepared from colloidal NP inks and heat treated in sulfur vapor, hydrogen sulfide, and nitrogen atmospheres. Under sulfur, the TET–TEN films were oxidized to tetragonal famatinite–luzonite (Cu3As1−xSbxS4). Heat treating under a reducing hydrogen sulfide atmosphere stabilized the mixed TET–TEN alloy compositions, though the endmember compositions partially decomposed via loss of volatile pnictogen sulfides. Losses of pnictogen and sulfur atoms were most significant when heat treating under an inert nitrogen atmosphere. Collectively, these results suggest that TET–TEN materials can be reversibly interconverted to famatinite–luzonite by selecting an appropriate annealing atmosphere. Our work serves as the foundation for both the synthesis and production of device-quality TET–TEN and related chalcogenide NP thin films.

Graphical abstract: Role of annealing atmosphere on the crystal structure and composition of tetrahedrite–tennantite alloy nanoparticles

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Publication details

The article was received on 06 Jun 2018, accepted on 05 Sep 2018 and first published on 08 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC02762E
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Role of annealing atmosphere on the crystal structure and composition of tetrahedrite–tennantite alloy nanoparticles

    S. A. McClary, R. B. Balow and R. Agrawal, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC02762E

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