Tracking the Growth of Chiral Plasmonic Nanocrystals at Molybdenum Disulfide Heterostructural Interfaces

Abstract

The way of accurately regulating the growth of chiral plasmonics is of great importance for exploring the chirality information and improving its potential values. Herein, cysteine enantiomers modulate the anisotropic and epitaxial growth of gold nanoplasmonics on seeds of exfoliated MoS 2 nanosheets. The heterostructural Au and MoS 2 hybrids induced by enantiomeric cysteine are presented with chiroptical characteristics, dendritic morphologies, and plasmonic performances. Moreover, the synthesis, condition optimization, formation mechanism, and plasmonic properties of Au and MoS 2 dendritic nanostructures are studied. The chirality characteristics are identified using the circular dichroism spectra and scanning electron microscopy. Time-resolved transmission electron microscopy and UV−vis spectra of the intermediate products captured are analyzed to confirm the formation mechanism of dendritic plasmonic nanostructures at heterostructural surfaces. The specific dendritic morphologies originate from the synergistic impacts of heterostructural MoS 2 interfaces and enantiomeric cysteine-induced anisotropic manipulation. Significantly, the developed synthesis strategy of chiral nanostructures at heterostructural interfaces is highly promising in promoting the understanding of the plasmonic function and crucial chirality bioinformation.

Cysteine-Induced Chirality Evolution of Molybdenum Disulfide Nanodots from a Bottom-Up Strategy

“…When the concentration of cysteine was 11.20 mM, the CD signals reached 150 mdeg. The mirror-symmetric CD responses were exhibited in the visible light zones, which were significantly different from the CD signals of the Cys molecules . Overall, the CD signals above 400 nm were attributed to the intrinsic semiconducting properties of MoS 2 , indicating chirality transfer from the molecules to nanostructures.…”

“…Similarly, the MoS 2 NDs prepared from diverse Cys enantiomers might exhibit potential chirality characteristics in their geometric features. 48 In order to identify the chirality point, the reaction product materials obtained in the presence of consistent concentrations of cysteine enantiomers were further studied using circular dichroism (CD) spectroscopy (Figure 2a 6 Overall, the CD signals above 400 nm were attributed to the intrinsic semiconducting properties of MoS 2 , indicating chirality transfer from the molecules to nanostructures. The chiroptical performance was attributed to the formation of semiconducting MoS 2 nanostructures with preferential folding on their planes.…”

“…The advancement of new nanomanufacturing technologies has also made it possible to generate chiral nanostructures, that exhibit a large number of circular dichroism (CD) responses. Moreover, chirality in the field of nanomaterials has been studied in a range of nanostructures, including nanodots, − nanoparticles, − nanotubes, and nanodevices . These nanomaterials have exhibited a huge range of potential applications, including sensors, , catalysts, , disease treatments, antibacterial, and advanced optical devices .…”

Spreading dynamics of a droplet upon impact with a liquid film containing solid particles

“…As an emerging material, nanoparticles have been extensively used in various processes. Understanding the spreading mechanism of nanoparticle-laden droplets on solid surfaces has potential applications in drug delivery, 5 medical diagnostics, and oil removal. Although there have been extensive experimental and simulation studies on pure liquid-phase droplet spreading dynamics, a unified understanding of certain aspects remains elusive, particularly regarding the integration of solid-phase nanoparticle variables into these dynamics.…”

Mercury-Mediated Epitaxial Accumulation of Au Atoms for Stained Hydrogel-Improved On-Site Mercury Monitoring

“…The involvement of heterogeneous seeds enables the high uniformity of plasmonic Au nanohybrids. − To improve the hydrogel-based analysis methods and uncover the target-reliant plasmonic recognition mechanism, polymeric CDs with reduction properties are synthesized via a hydrothermal reaction, which were prefilled on the hydrogel backbone to launch the growth of Au NPs according to the redox–reductant reaction between CDs and HAuCl 4 . More importantly, this method enables the transfer of the aqueous-phase reaction into the hydrogel phase, which simplifies the operation and realizes the LSPR signal amplification strategy to enhance the stability and sensitivity of colorimetric sensing of Au NPs (Scheme ).…”