The Remote Light Emission Modulated by Local Surface Plasmon Resonance for the CdSe NW–Au NP Hybrid Structure

He, Jingru; Li, Jing; Xia, Jing; Tian, Lanlan; Jin, Binbin; Zhou, Shaomin; Sun, Mengtao; Meng, Xiang‐Min

doi:10.1002/admi.201801418

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…Local order is sensitive to the exact molecular structure of the solvent, and one would expect large differences in colloidal stability for solvents that have similar bulk properties but different molecular structures such as nhexane and cyclohexane. This should make it possible to precisely tune the spacing between wires and thus control their coupling, for example, to control the fluorescence of semiconductor nanowires, 42,43 tune charge carrier tunneling between metal nanowires, 44 or modulate the mechanical properties of fibers made from nanowires. 12 If bundling is undesirable, it will be useful to perturb the order of the solvent layer and suppress entropic bundling.…”

Section: Nano Lettersmentioning

confidence: 99%

Entropy Can Bundle Nanowires in Good Solvents

et al. 2019

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Surfaces with surface-bound ligand molecules generally attract each other when immersed in poor solvents but repel each other in good solvents. While this common wisdom holds, for example, for oleylamine-ligated ultrathin nanowires in the poor solvent ethanol, the same nanowires were recently observed experimentally to bundle even when immersed in the good solvent n-hexane. To elucidate the respective binding mechanisms, we simulate both systems using molecular dynamics. In the case of ethanol, the solvent is completely depleted at the interface between two ligand shells so that their binding occurs, as expected, via direct interactions between ligands. In the case of n-hexane, ligands attached to different nanowires do not touch. The binding occurs because solvent molecules penetrating the shells preferentially orient their backbone normal to the wire, whereby they lose entropy. This entropy does not have to be summoned a second time when the molecules penetrate another nanowire. For the mechanism to be effective, the ligand density appears to best be intermediate, that is, small enough to allow solvent molecules to penetrate, but not so small that ligands do not possess a clear preferred orientation at the interface to the solvent. At the same time, solvent molecules may be neither too large nor too small for similar reasons. Experiments complementing the simulations confirm the predicted trends.

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Section: Nano Lettersmentioning

confidence: 99%

Entropy Can Bundle Nanowires in Good Solvents

et al. 2019

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“…In the past, nanowire-nanoparticle junctions have been utilized to understand the input polarization dependence and SERS enhancement, [22][23][24][25][26] to enhance performance of optoelectronic devices, [27] directional elastic scattering and fluorescence, [28] remote-excitation SERS, [29,30] to understand coupling, [31] etc. In all these experiments, either the molecular signature is not exactly from the junction alone or the momentum resolved imaging is not carried out.…”

mentioning

confidence: 99%

Momentum‐Resolved Surface Enhanced Raman Scattering from a Nanowire–Nanoparticle Junction Cavity

Vasista

Chaubey

Gosztola

et al. 2019

Advanced Optical Materials

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Herein experimental evidence of directional surface enhanced Raman scattering from molecules situated inside a single nanowire–nanoparticle junction cavity is reported. The emission is confined to a narrow range of wavevectors perpendicular to the axis of the cavity. In addition to this, the molecules excite multiple guided modes of the nanowire which are imaged using leakage radiation Fourier microscopy. The emission wavevectors are further characterized as a function of output polarization. The excited guided modes of the wire show interesting polarization signatures. All the results are corroborated using finite element method based numerical simulations. Essentially, an important connection between gap‐cavity enhanced Raman scattering and its directionality of emission is provided. The results may be of relevance in understanding the cavity electrodynamics at the nanoscale and molecular coupling to extremely small gaps between a 1D and a 0D plasmonic nanostructure.

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