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Nano-gold with in situ grown surface charge-layer in organic framework; superlattice-chiral structures; and tailored optical properties
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DOI：10.1039/D6CP01259K.png)
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Abstract
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Nano-gold of chiral and superlattice structures is a model system to finely tailor its exotic properties for optical devices; energy harvesters; biosensors; and many other applications. In this view; here we explore the formalism of it can bond to •CF2 dipoles (opposite polarity) in a polymer; such as poly(vinylidene fluoride) (PVDF); a way to order in such high-energy structures in the polymer. With varied media of hydrothermal reactions; it is described that a gold salt HAuCl4∙3H2O dispersed with PVDF in a polar liquid slowly releases Au atoms; which in situ bond to •CF2 heads in the PVDF chains in the forms of AuPVDF nanofluids. The PVDF dose is varied 1 100 g/L (with a fixed 0.5 wt% Au) to explore how it modulates Au3+ Au 3e- reaction and bonds over (as a template) the nascent Au-atoms to order on the Auanchored PVDF chains. The metal-ligand bonds create a charge Au+ PVDF layer that boosts the tailored properties. The Au+ ions of 1D2 3DJ (J = 1 3) interband transitions (Au+5d10 5d96s1) markedly trigger UV-visible-NIR light absorption/emission of coupled excitons of C-sp2 electrons (PVDF); Au5d106s1 electrons; and Au-LSPs (localized surface-plasmon) cross-inked in the network channels. Thus; the 3D3 states are superior light emitter than the AuLSPs. The premier results are described in correlation to microscopic images; XRD patterns; XPS bands; and phonons of the Au-PVDF nanofluids and films. An optimized charge layer plays a game changer in advancing the exotic properties for the applications. Keywords: Nano-gold; Superlattice structures; Clusters; Metalpolymer hybrids; Hybrid heterojunctions; Light absorbers; Light emitters
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