Fine-tune chiroptical activity in discrete chiral Au nanorods

Zheng, Guangchao; Jiao, Sulin; Zhang, Wei; Wang, Shenli; Zhang, Qinghua; Gu, Lin; Ye, Weixiang; Li, Junjun; Ren, Xiaochen; Zhang, Zhicheng; Wong, K.P.

doi:10.1007/s12274-022-4212-y

Cited by 37 publications

(27 citation statements)

References 44 publications

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“…However, no signal reversal in CD spectra of chiral Au NRs was observed and propeller geometry with bichiral centers was undistinguishable from the structural feature, which is in line with recent work on anisotropic chiral NRs. 41,[46][47][48]53,55,79 To further investigate the effect of Au seeds with different crystal structures, we replaced the singlecrystalline Au seeds with the polycrystalline Au nanospheres (NSs), which was prepared by a citrate-based reduction method (Figure S40). 80 Also, no CD reversal was observed when using polycrystalline Au NSs as seeds (Figure 7F), and random distortions and twists were observed from the structures in the as-prepared chiral Au NPs (Figure S41).…”

Section: Resultsmentioning

confidence: 99%

Tunable Reversal of Circular Dichroism in the Seed-Mediated Growth of Bichiral Plasmonic Nanoparticles

et al. 2022

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Plasmonic nanoparticles with an intrinsic chiral structure have emerged as a promising chiral platform for applications in biosensing, medicine, catalysis, separation, and photonics. Quantitative understanding of the correlation between nanoparticle structure and optical chirality becomes increasingly important but still represents a significantly challenging task. Here we demonstrate that tunable signal reversal of circular dichroism in the seed-mediated chiral growth of plasmonic nanoparticles can be achieved through the hybridization of bichiral centers without inverting the geometric chirality. Both experimental and theoretical results demonstrated the opposite sign of circular dichroism of two different bichiral geometries. Chiral molecules were found to not only contribute to the chirality transfer from molecules to nanoparticles but also manipulate the structural evolution of nanoparticles that synergistically drive the formation of two different chiral centers. By deliberately adjusting the concentration of chiral molecules and other synthetic parameters, such as the reducing agent concentration, the capping surfactant concentration, and the amount of Au precursor, we have been able to fine-tune the circular dichroism reversal of bichiral Au nanoparticles. We further demonstrate that the structure of chiral molecules and the crystal structure of Au seeds play crucial roles in the formation of Au nanoparticles with bichiral centers. The insights gained from this work not only shed light on the underlying mechanisms dictating the intriguing geometric and chirality evolution of bichiral plasmonic nanoparticles but also provide an important knowledge framework that guides the rational design of bichiral plasmonic nanostructures toward chiroptical applications.

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Section: Resultsmentioning

confidence: 99%

Tunable Reversal of Circular Dichroism in the Seed-Mediated Growth of Bichiral Plasmonic Nanoparticles

et al. 2022

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“…Furthermore, these researchers fabricated a series of dc-Au NRs with a controllable aspect ratio, in which the wavelength of PCD peaks also red-shifted as the aspect ratio increased. In fact, chiroptical activities of dc-Au NRs are not only contributed by the near-field electromagnetic field within the nanogap or nanocavity but also due to the twisted structural effect . Following that, several groups have extended the dc-Au NRs with other functionalities by coating semiconductors or sensitive polymers .…”

Section: Fabrication Strategies For the Various Types Of C-au Nrsmentioning

confidence: 99%

“…In fact, chiroptical activities of dc-Au NRs are not only contributed by the near-field electromagnetic field within the nanogap or nanocavity but also due to the twisted structural effect. 161 Following that, several groups have extended the dc-Au NRs with other functionalities by coating semiconductors or sensitive polymers. 162 Wang and coworkers produced a complex alloy of 3M dc-AuCuAu NRs through three-steps of seed-mediated approaches.…”

Section: Assembly Of Aumentioning

confidence: 99%

Chiral Au Nanorods: Synthesis, Chirality Origin, and Applications

et al. 2022

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Chiral Au nanorods (c-Au NRs) with diverse architectures constitute an interesting nanospecies in the field of chiral nanophotonics. The numerous possible plasmonic behaviors of Au NRs can be coupled with chirality to initiate, tune, and amplify their chiroptical response. Interdisciplinary technologies have boosted the development of fabrication and applications of c-Au NRs. Herein, we have focused on the role of chirality in c-Au NRs which helps to manipulate the light− matter interaction in nontraditional ways. A broad overview on the chirality origin, chirality transfer, chiroptical activities, artificially synthetic methodologies, and circularly polarized applications of c-Au NRs will be summarized and discussed. A deeper understanding of light−matter interaction in c-Au NRs will help to manipulate the chirality at the nanoscale, reveal the natural evolution process taking place, and set up a series of circularly polarized applications.

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“…However, the bottom-up synthesis of NMNZs with intrinsic chiral morphology in nanoscale is usually difficult to achieve. [159] Although there have been some excellent jobs to achieve the synthesis of chiral NMNZs, [56,[159][160][161] the applications in enantiomeric recognition are rarely been reported. To date, the chiral structure of the nanozymes has been mainly formed by the modification of the chiral ligand, which can realize the enantioselectivity of the chiral substrate.…”

Section: The Enantioselective Recognition Designmentioning

confidence: 99%

“…However, synthetic nanozymes generally lack this property. [52][53][54] The thiolated ligands with various functional groups can be linked to the surface of NMs by forming NM-S covalent bonds, [55,56] giving NMNZs the advantages of functionalization. [57] The capacity of NMNZs to combine with chirality can not only overcome the defects of natural enzymes but also have enantioselectivity similar to that of natural enzymes.…”

Section: Introductionmentioning

confidence: 99%

Detection of Glucose Based on Noble Metal Nanozymes: Mechanism, Activity Regulation, and Enantioselective Recognition

Chen

Liu

Zheng

et al. 2022

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Glucose monitoring is essential to evaluate the degree of glucose metabolism disorders. The enzymatic determination has been the most widely used method in glucose detection because of its high efficiency, accuracy, and sensitivity. Noble metal nanomaterials (NMs, i.e., Au, Ag, Pt, and Pd), inheriting their excellent electronic, optical, and enzyme‐like properties, are classified as noble metal nanozymes (NMNZs). As the NMNZs are often involved in two series of reactions, the oxidation of glucose and the chromogenic reaction of peroxide, here the chemical mechanism by employing NMNZs with glucose oxidase (GOx) and peroxidase (POD) mimicking activities is briefly summarized first. Subsequently, the regulation strategies of the GOx‐like, POD‐like and tandem enzyme‐like activities of NMNZs are presented in detail, including the materials, size, morphology, composition, and the reaction condition of the representative NMs. In addition, in order to further mimic the enantioselectivity of enzyme, the design of NMNZs with enantioselective recognition of d‐glucose and l‐glucose by using different chiral compounds (DNA, amino acids, and cyclodextrins) and molecular imprinting is further described in this review. Finally, the feasible solutions to the existing challenges and a vision for future development possibilities are discussed.

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Fine-tune chiroptical activity in discrete chiral Au nanorods

Cited by 37 publications

References 44 publications

Tunable Reversal of Circular Dichroism in the Seed-Mediated Growth of Bichiral Plasmonic Nanoparticles

Tunable Reversal of Circular Dichroism in the Seed-Mediated Growth of Bichiral Plasmonic Nanoparticles

Chiral Au Nanorods: Synthesis, Chirality Origin, and Applications

Detection of Glucose Based on Noble Metal Nanozymes: Mechanism, Activity Regulation, and Enantioselective Recognition

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