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Integrating Structurally Perfect S=1/2 Kagome-Lattice with Reduced Graphene Oxide

Show simple item record GUPTA, KRITI en_US Dadwal, Arun en_US NINAWE, PRANAY en_US Joy, Pattayil A en_US BALLAV, NIRMALYA en_US 2020-10-09T11:01:08Z 2020-10-09T11:01:08Z 2020-09 en_US
dc.identifier.citation Journal of Physical Chemistry C, 124(36), 19753-19759. en_US
dc.identifier.issn 1932-7447 en_US
dc.identifier.issn 1932-7455 en_US
dc.identifier.uri en_US
dc.description.abstract S = 1/2 kagome-lattice hydroxychlorides are promising candidates for realizing the elusive quantum spin liquid (QSL) state. Herbertsmithite [Cu3Zn(OH)6Cl2], a naturally occurring hydroxychloride mineral from the class of atacamites {[Cu4–xMx(OH)6X2] where M = Zn, Cu, Co, Ni and X = Cl, Br, I}, is one of the most appealing systems to study the QSL state because of the presence of a structurally perfect S = 1/2 kagome-lattice. It is an electrical insulator. However, realizing phase-pure herbertsmithite without imposing harsh reaction conditions remained synthetically challenging. In this work, for the first time, we have synthesized phase-pure herbertsmithite as well as its structural analogue paratacamite, [ZnxCu4–x(OH)6Cl2; 0.33 ≤ x < 1], at ambient reaction conditions. Furthermore, taking graphene oxide (GO) as an additional precursor in the reaction mixture, we have successfully integrated phase-pure crystallites of herbertsmithite (H) and paratacamite (P) with nanosheets of semiconducting and diamagnetic reduced graphene oxide (rGO) by in situ oxidation–reduction reaction. The isolated H-rGO and P-rGO systems were found to be magnetic semiconductors inheriting strong spin frustration from H and P, and semiconductivity from rGO. The H-rGO system in particular exhibited negative Seebeck coefficient (n-type semiconductor) with a thermoelectric power factor of 0.1 μW·m–1·K–2 at 400 K. We anticipate the simple chemical principles outlined in this work to be useful for studying a variety of complex QSLs including electron doping. Also, semiconducting and rather unconventional materials of such metal oxochlorides with rGO isolated here need further exploration in view of thermoelectric applications. en_US
dc.language.iso en en_US
dc.publisher American Chemical Society en_US
dc.subject State en_US
dc.subject Herbertsmithite en_US
dc.subject 2020 en_US
dc.subject 2020-OCT-WEEK1 en_US
dc.subject TOC-OCT-2020 en_US
dc.title Integrating Structurally Perfect S=1/2 Kagome-Lattice with Reduced Graphene Oxide en_US
dc.type Article en_US
dc.contributor.department Dept. of Chemistry en_US
dc.identifier.sourcetitle Journal of Physical Chemistry C en_US
dc.publication.originofpublisher Foreign en_US

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