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Enhanced circular dichroism in hybrid graphenea??metal metamaterials at the near-infrared region
摘要： Strong circular dichroism (CD) effect has gained great interest in nano-optical sensing and detection due to its desirable applications. In this work, we theoretically demonstrate that CD effects can be extremely enhanced in hybrid graphene–metal metamaterials at the near-infrared region. Benefiting from the strong coupling between graphene sheets and chiral metal nanocrystals, the maximum peak value of CD responses can be reached at 9.2% and the other peak value is more than twice as much as the without-graphene systems. When there is one more graphene layer covered on the chiral nanocrystals, the CD responses increase further. For single-layer graphene nanoribbons covered on the spacer, the CD response increases with the increasing filling ratio. The simulation results show that the CD response decreases rapidly with the increase of the distance between the chiral nanocrystals and the graphene sheet. Besides, with the increase of the thickness of the spacer, two CD resonance peaks, one increases faster and the other goes from decreasing to increasing compared with the without-graphene systems. Overall, we can greatly enhance CD effects in the near-infrared region by adding graphene layers, which can provide potential applications in the fields of biosensing and optoelectronic devices.
关键词： Plasmonic resonance,Graphene–metal metamaterials,Near-infrared region,Circular dichroism
更新于2025-09-23 15:19:57
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Rhomboidal Pt(II) metallacycle-based NIR-II theranostic nanoprobe for tumor diagnosis and image-guided therapy
摘要： Fluorescent theranostics probes at the second near-IR region (NIR-II; 1.0–1.7 μm) are in high demand for precise theranostics that minimize autofluorescence, reduce photon scattering, and improve the penetration depth. Herein, we designed and synthesized an NIR-II theranostic nanoprobe 1 that incorporates a Pt(II) metallacycle 2 and an organic molecular dye 3 into DSPE-mPEG5000 (1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-5000]). This design endows 1 with good photostability and passive targeting ability. Our studies show that 1 accurately diagnoses cancer with high resolution and selectively delivers the Pt(II) metallacycle to tumor regions via an enhanced permeability and retention effect. In vivo studies reveal that 1 efficiently inhibits the growth of tumor with minimal side effects. At the same time, improved fluorescent imaging quality and signal-to-noise ratios are shown due to the long emission wavelengths. These studies demonstrate that 1 is a potential theranostic platform for tumor diagnosis and treatment in the NIR-II region.
关键词： metallacycle,image-guided therapy,supramolecular coordination complexes,second near-infrared region,theranostic
更新于2025-09-19 17:15:36
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Study of Electrophotophysical Characteristics of IR Photodetectors Based on PbS Colloidal Quantum Dots
摘要： The electrophotophysical characteristics of laboratory samples of IR photodetectors obtained by dip coating of PbS colloidal quantum dots with the subsequent exchange of oleic acid molecules that compose their ligand shell by S2? ions have been studied.
关键词： thin layers,electrophysical characteristics of layers,spectral and luminescent properties,dip-coating method,near infrared region,PbS colloidal quantum dots,ligand exchange,IR photodetectors
更新于2025-09-16 10:30:52