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Metallomesogen Templates for Shape Control of Metal Selenide Nanocrystals
journal contribution
posted on 2017-03-31, 00:00 authored by Whitney Bryks, Stephanie C. Smith, Andrea R. TaoMetal
alkanethiolates are organometallic single-source precursors
that have been used to synthesize metal sulfide nanocrystals (NCs)
from thermal decomposition reactions. Ag and Cu alkanethiolates are
remarkable because they adopt lamellar bilayer nanostructures that
give rise to mesogenic behavior akin to that of thermotropic liquid
crystals. Such metallomesogen precursors have been demonstrated to
template the nucleation and growth of highly anisotropic NC morphologies.
In this work, we synthesize novel metallomesogen compounds, namely,
CuSeC12H25 and AgSeC12H25, to target shaped metal selenide NCs. We show that these compounds
adopt lamellar bilayer structures and undergo mesogenic transitions
at elevated temperatures. We find that structural disparities between
the CuSeC12H25 and AgSeC12H25 mesophases lead to the formation of distinct two- and one-dimensional
NC morphologies, respectively. Moreover, both compounds exhibit an
isotropic phase that produces either nanospheres or irregularly shaped
particles. By exploiting the morphology-directing capability of the
mesogenic regime, we detail the synthesis of ultrathin Cu2Se nanoribbons, Ag2Se nanorods, and AgCuSe nanospheres.
This work demonstrates that metallomesogens can serve as a novel class
of NC precursors with the ability to access highly anisotropic morphologies
and tailored compositions.
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Metal Selenide Nanocrystals Metal alkanethiolatesmorphology-directing capabilityAg 2 Se nanorodsSuch metallomesogen precursorsAgCuSe nanospheresorganometallic single-source precursorsAgSeC 12 H 25 mesophasesAgSeC 12 H 25Shape Controldecomposition reactionsMetallomesogen Templatesmesogenic behaviorultrathin Cu 2 Se nanoribbonsnovel metallomesogen compoundsNC precursorsmetal sulfide nanocrystalslamellar bilayer structuresmesogenic regimeCuSeC 12 H 25NC morphologiesmetal selenide NCsCu alkanethiolatesanisotropic morphologiesnovel classmesogenic transitionslamellar bilayer nanostructuresanisotropic NC morphologiescompounds exhibit
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