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Unique Growth Pathway in Solution-Solid-Solid Nanowires: Cubic to Hexagonal Phase Transformation.

ABSTRACT: Solution-solid-solid (SSS) nanowires can be catalyzed by superionic Ag₂S via ion diffusion. Here, we synthesize ZnS nanowires of the wurtzite crystal structure and heterostructures via a low-temperature growth pathway. Single-crystalline ZnS nanowires were produced by varying reaction time and temperature (120-200 °C) via thermal decomposition of a single-source precursor, Zn(DDTC)₂. A phase transformation (zinc blende → wurtzite) was observed during the synthesis with a three-step growth pathway proposed. Temperature-controlled phase transformation facilitates oriented attachment into a 1D nanowire, followed by helical epitaxial and lateral growths during ripening. Additionally, the CdS-ZnS heterostructured nanowires can be obtained after introducing the Cd(DDTC)₂ precursor. ZnS nanowires of defined diameters (5-10 nm) are served as backbones to grow heterostructures of ternary semiconductors with multicolor photoluminescence (450-800 nm). Structural and optical characterizations (PL, 2D PLE, and TCSPC) are investigated to confirm origins of broadband emission from multiple lifetimes (0.5-12 ns) for exciton recombination in heterostructures. Our study demonstrates this unique growth pathway for SSS nanowire synthesis under mild, facile, and atmospheric conditions.

SUBMITTER: Liu YH

PROVIDER: S-EPMC7391935 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Unique Growth Pathway in Solution-Solid-Solid Nanowires: Cubic to Hexagonal Phase Transformation.

Liu Yi-Hsin YH Chen Ho-Ying HY Fan Hsiu-Fang HF Chen Yu-Hsien YH Wang Fudong F

ACS omega 20200717 29

Solution-solid-solid (SSS) nanowires can be catalyzed by superionic Ag2S via ion diffusion. Here, we synthesize ZnS nanowires of the wurtzite crystal structure and heterostructures via a low-temperature growth pathway. Single-crystalline ZnS nanowires were produced by varying reaction time and temperature (120-200 °C) via thermal decomposition of a single-source precursor, Zn(DDTC)2. A phase transformation (zinc blende → wurtzite) was observed during th ...[more]

PMID: 32743221

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Project description:Lyotropic phases of amphiphiles are a prototypical example of self-assemblies. Their structure is generally determined by amphiphile shape and their phase transitions are primarily governed by composition. In this paper, we demonstrate a new paradigm for membrane shape control where the electrostatic coupling of charged membranes to short DNA (sDNA), with tunable temperature-dependent end-to-end stacking interactions, enables switching between the inverted gyroid cubic structure (QII(G)) and the inverted hexagonal phase (HII(C)). We investigated the structural shape transitions induced in the QII(G) phase upon complexation with a series of sDNAs (5, 11, 24, and 48 bp) with three types of end structure ("sticky" adenine (A)-thymine (T) (dAdT) overhangs, no overhang (blunt), and "nonsticky" dTdT overhangs) using synchrotron small-angle X-ray scattering. Very short 5 bp sDNA with dAdT overhangs and blunt ends induce coexistence of the QII(G) and the HII(C) phase, with the fraction of QII(G) increasing with temperature. Phase coexistence for blunt 5 bp sDNA is observed from 27 °C to about 65 °C, where the HII(C) phase disappears and the temperature dependence of the lattice spacing of the QII(G) phase indicates that the sDNA duplexes melt into single strands. The only other sDNA for which melting is observed is 5 bp sDNA with dTdT overhangs, which forms the QII(G) phase throughout the studied range of temperature (27 °C to 85.2 °C). The longer 11 bp sDNA forms coexisting QII(G) and HII(C) phases (with the fraction of QII(G) again increasing with temperature) only for "nonsticky" dTdT overhangs, while dAdT overhangs and blunt ends exclusively template the HII(C) phase. For 24 and 48 bp sDNAs the HII(C) phase replaces the QII(G) phase at all investigated temperatures, independent of sDNA end structure. Our work demonstrates how the combined effects of sDNA length and end structure (which determine the temperature-dependent stacking length) tune the phase behavior of the complexes. These findings are consistent with the hypothesis that sDNAs and sDNA stacks with lengths comparable to or larger than the cubic unit cell length disfavor the highly curved channels present in the QII(G) phase, thus driving the QII(G)-to-HII(C) phase transition. As the temperature is increased, the breaking of stacks due to thermal fluctuations restores increasing percentages of the QII(G) phase.

Dataset Information

Unique Growth Pathway in Solution-Solid-Solid Nanowires: Cubic to Hexagonal Phase Transformation.

Publications

Unique Growth Pathway in Solution-Solid-Solid Nanowires: Cubic to Hexagonal Phase Transformation.

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