Resonance energy transfer (RET) is an inherently anisotropic process. Even the simplest, well-known Förster theory, based on the transition dipole-dipole coupling, implicitly incorporates the anisotropic character of RET. In this theoretical work, we study possible signatures of the fundamental anisotropic character of RET in hybrid nanomaterials composed of a semiconductor nanoparticle (NP) decorated with molecular dyes. In particular, by means of a realistic kinetic model, we show that the analysis of the dye photoluminescence difference for orthogonal input polarizations reveals the anisotropic character of the dye-NP RET which arises from the intrinsic anisotropy of the NP lattice. In a prototypical core/shell wurtzite CdSe/ZnS NP functionalized with cyanine dyes (Cy3B), this difference is predicted to be as large as 75% and it is strongly dependent in amplitude and sign on the dye-NP distance. We account for all the possible RET processes within the system, together with competing decay pathways in the separate segments. In addition, we show that the anisotropic signature of RET is persistent up to a large number of dyes per NP.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5171219 | PMC |
| http://dx.doi.org/10.1039/c6ra22433d | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A Series of AnO Complexes (An = U, Np, Pu) with NO-Donating Schiff-Base Ligands: Systematic Trends in the Molecular Structures and Redox Behavior.
Inorg Chem
January 2025
Laboratory for Zero-Carbon Energy, Institute of Integrated Research, Institute of Science Tokyo, 2-12-1 N1-32, O-okayama, Meguro-ku, Tokyo 152-8550, Japan.
Article Synopsis
- Actinide elements like U, Np, and Pu often form actinyl ions (AnO) in their +V and +VI oxidation states, which are significant for understanding environmental behavior and nuclear processes.
- Research on [AnO(saldien)] complexes shows that their molecular structures share similarities, with some variations caused by actinide contraction, while their redox potentials increase from U to Np and then decrease to Pu, indicating distinct electronic configurations.
- The study's findings, supported by DFT-based calculations, enhance our understanding of actinide oxidation states, which is crucial for various applications, including nuclear fuel management and advancements in spintronics.
The Precise Synthesis of Ultradense Bottlebrush Polymers Unearths Unique Trends in Lyotropic Ordering.
J Am Chem Soc
December 2024
Department of Chemistry at Brown University, 324 Brook Street, Providence, Rhode Island 02912, United States.
Biomacromolecular networks with multiscale fibrillar structures are characterized by exceptional mechanical properties, making them attractive architectures for synthetic materials. However, there is a dearth of synthetic polymeric building blocks capable of forming similarly structured networks. Bottlebrush polymers (BBPs) are anisotropic graft polymers with the potential to mimic and replace biomacromolecules such as tropocollagen for the fabrication of synthetic fibrillar networks; however, a longstanding limitation of BBPs has been the lack of rigidity necessary to access the lyotropic ordering that underpins the formation of collagenous networks.
View Article and Find Full Text PDFNonlinear Elasticity of Amorphous Silicon and Silica from Density Functional Theory.
J Phys Chem C Nanomater Interfaces
December 2024
Department of Chemistry, College of Staten Island, Staten Island, New York 10314, United States.
Density functional theory calculations and a finite deformation method are used to calculate second- and, most notably, third-order elastic constants of amorphous silicon and amorphous silicon dioxide, as represented by model structures generated via melt-quench force-field molecular dynamics simulations. Linear and nonlinear elastic constants are used to deduce macroscopic elastic moduli, such as the bulk and shear moduli, their pressure derivatives, and the elastic Grüneisen parameter. Our calculations show that the elastic properties of amorphous silicon reach the isotropic elastic limit within the nanometer length scale, attaining characteristics, both linear and nonlinear, comparable to those of crystalline silicon.
View Article and Find Full Text PDFHigh Relative Humidity-Induced Growth of Perovskite Nanowires from Glass toward Single-Mode Photonic Nanolasers at Sub-100-nm Scale.
Adv Sci (Weinh)
December 2024
Zhejiang Lab, Hangzhou, 311121, China.
Article Synopsis
- Metal halide perovskites (MHPs) show promise but suffer from structural instability, particularly in high humidity, which limits their practical use.
- Researchers discovered a method to grow nanowires (NWs) of MHP on glass surfaces under 85% humidity, allowing for tunable lengths and compositions.
- These nanowire lasers demonstrated impressive qualities such as high quality factor and stability, opening up new possibilities for advanced optical applications.
The good, the bad and the ugly faces of cyanobiphenyl mesogens in selected tracks of fundamental and applied liquid crystal research.
Liq Cryst
December 2023
Experimental Soft Matter Physics group, Department of Physics and Materials Science, University of Luxembourg, Luxembourg, Luxembourg.
Liquid crystal-forming cyanobiphenyls are truly extraordinary molecules that have had an enormous impact on liquid crystal research and applications since they were first synthesised. This impact is, on the one hand, due to the exceptionally convenient physical properties of the main characters, 5CB and 8CB, allowing easy experiments at room temperature, as well as their commercial availability at reasonable cost. On the other hand, the cyanobiphenyl chemical structure leads to some quite peculiar characteristics in terms of organisation at the molecular scale, which are sometimes well recognised and even utilised, but often the awareness of these peculiarities is not strong.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!