One-Fold Anisotropy of Silver Chiral Nanoparticles Studied by Second-Harmonic Generation

Dong, Bin; Liu, Junjun; Xue, Man; Ni, Ziyue; Guo, Yuan; Huang, Zhifeng; Zhang, Zhen

doi:10.1021/acssensors.0c02031

Cited by 4 publications

(2 citation statements)

References 66 publications

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“…GLAD with fast substrate rotation typically generates CNPs with the chirality at the atomic scale, rather than at the nanoscale (Figure 1a‐c). [ 31 ] The as‐deposited CNPs vertically protrude on the supporting substrate to cause linear birefringence and dichroism, due to their anisotropic growth orientation. The linear birefringence and dichroism were effectively eliminated by averaging their CD signals measured at multiple azimuthal angles (refer to Experimental Section), so that the monitored CD‐related OAs intrinsically originate from their chiral lattices.…”

Section: Resultsmentioning

confidence: 99%

Multielementary Alloy Chiral Nanoparticles with Strong Optical Activities

Yang²,

et al. 2023

Advanced Optical Materials

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Structural chirality has been imposed onto nano‐alloys to introduce diverse new properties. Chiral nanoparticles (CNPs) with the atomic scale chirality are composed of metastable chiral lattices having low thermal stability, so multielementary (>2 elements) CNPs are very challenging to produce using traditional high‐energy fabrication methods. Herein, layer‐by‐layer glancing angle deposition (LbL‐GLAD) at a low substrate temperature of ≈−40 °C, consisting of GLAD of the host CNPs and the subsequent GLAD of guests, is devised to extend the alloy compositional space to the ternary (e.g., Ag:Al:Cu and Ag:Al:Au) and quaternary (e.g., Ag:Al:Cu:Au and Al:In:Sn:Ti). The low‐temperature GLAD‐induced alloying facilitates the formation of the metastable multi‐layer chiral twisting of achiral facets, chiral defects due to the diffusion of the guests, and chiral electronic bands, leading to a significant amplification of chiroplasmonic optical activities in 20–30 folds. The LbL‐GLAD can be generally adapted to fabricate multielementary alloy CNPs composed of a wide range of elements, with a prospective application of asymmetric catalysts to synthesize an enantiomer with designable chirality, one of the most important topics in modern chemistry and biochemistry to solve the problems of health and environmental pollution.

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Section: Resultsmentioning

confidence: 99%

Multielementary Alloy Chiral Nanoparticles with Strong Optical Activities

Yang²,

et al. 2023

Advanced Optical Materials

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“…Here, we apply GLAD , to fabricate semiconductor luminophore NHs made of cadmium selenide (CdSe) and ceria (CeO 2 ) for the emission of CPLE in red and UV–blue spectral regions, respectively. Chiral ligands have been widely used to generate chiral CdSe quantum dots with an emission of the CPL-dominant CPLE in the visible region .…”

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confidence: 99%

Significant Enhancement of Circular Polarization in Light Emission through Controlling Helical Pitches of Semiconductor Nanohelices

Ni,

Qin,

Liu

et al. 2023

ACS Nano

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Circularly polarized light emission (CPLE) can be potentially applied to three-dimensional displays, information storage, and biometry. However, these applications are practically limited by a low purity of circular polarization, i.e., the small optical dissymmetry factor g CPLE . Herein, glancing angle deposition (GLAD) is performed to produce inorganic nanohelices (NHs) to generate CPLE with large g CPLE values.CdSe NHs emit red CPLE with g CPLE = 0.15 at a helical pitch (P) ≈ 570 nm, having a 40-fold amplification of g CPLE compared to that at P ≈ 160 nm. Ceria NHs emit ultraviolet−blue CPLE with g CPLE ≈ 0.06 at P ≈ 830 nm, with a 10 3 -fold amplification compared to that at P ≈ 110 nm. Both the photoluminescence and scattering among the close-packed NHs complicatedly account for the large g CPLE values, as revealed by the numerical simulations. The GLAD-based NH-fabrication platform is devised to generate CPLE with engineerable color and large g CPLE = 10 −2 −10 −1 , shedding light on the commercialization of CPLE devices.

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Chiral Effect on the Spin Crossover Behavior in a Pair of Co(II) Enantiomers and their Racemic Complex

Zhang,

Sun,

Chen

et al. 2024

Eur J Inorg Chem

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The combination of spin crossover (SCO) with chirality has caught increasing research interest owing to its potential applications in the fields of multifunctional magnetic molecular materials and devices. In this work, we synthesized a pair of homochiral Co(II) SCO complexes and their racemic complex by applying chiral Schiff base terimine ligands modified by naphthyl group. Single‐crystal X‐ray diffraction results showed that the chiral ligands retained chirality after coordination with Co(II) ion, giving rise to a pair of enantiomeric Co(II) complexes in the RR and SS configurations, respectively. The circular dichroism spectroscopy demonstrated the enantiomeric nature of the homochiral complexes. The enantiomers exhibited similar thermally induced SCO, while the racemate was trapped in the high spin state. The differences in SCO behavior between the homochiral and racemic complexes are attributed to different supramolecular interactions. This work provides a feasible approach to constructing new chiral SCO materials and offers perspectives in developing switchable nonlinear optical magnetic materials.

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One-Fold Anisotropy of Silver Chiral Nanoparticles Studied by Second-Harmonic Generation

Cited by 4 publications

References 66 publications

Multielementary Alloy Chiral Nanoparticles with Strong Optical Activities

Multielementary Alloy Chiral Nanoparticles with Strong Optical Activities

Significant Enhancement of Circular Polarization in Light Emission through Controlling Helical Pitches of Semiconductor Nanohelices

Chiral Effect on the Spin Crossover Behavior in a Pair of Co(II) Enantiomers and their Racemic Complex

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