Semi-transparent, flexible, and electrically conductive silicon mesh by capillarity-driven welding of vapor-liquid-solid-grown nanowires over large areas

Celano, Thomas A.; Kim, Seokhyoung; Hill, David J. T.; Cahoon, James F.

doi:10.1007/s12274-020-2742-8

Cited by 4 publications

(5 citation statements)

References 42 publications

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“…The vapor-phase functionalization we employed in this work was chosen over solution-based methods 37 because capillary forces would collapse the NWs. 49 As shown in Figure 1D, periodic focused ion beam (FIB) cross sectioning of a core/shell NW was performed, and the SEM images confirm the uniformity and conformality of the Au shell.…”

Section: Resultsmentioning

confidence: 99%

“…We purposefully avoided conventional metallic adhesion layers such as Cr to avoid additional metals that may impact the plasmon resonances of the Au shell. The vapor-phase functionalization we employed in this work was chosen over solution-based methods because capillary forces would collapse the NWs . As shown in Figure D, periodic focused ion beam (FIB) cross sectioning of a core/shell NW was performed, and the SEM images confirm the uniformity and conformality of the Au shell.…”

Section: Results and Discussionmentioning

confidence: 99%

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Epitaxially Grown Silicon Nanowires with a Gold Molecular Adhesion Layer for Core/Shell Structures with Compact Mie and Plasmon Resonances

Murphey,

Park,

Kim

et al. 2023

ACS Nano

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Noble-metal plasmonic nanostructures have attracted much attention because they can support deep-subwavelength optical resonances, yet their performance tends to be limited by high Ohmic absorption losses. In comparison, high-index dielectric materials can support low-loss optical resonances but do not tend to yield the same subwavelength optical confinement. Here, we combine these two approaches and examine the dielectric-plasmonic resonances in dielectric/metal core/shell nanowires. Si nanowires were grown epitaxially from (111) substrates, and direct deposition of Au on these structures by physical vapor deposition yielded nonconformal Au islands. However, by introduction of a molecular adhesion layer prior to deposition, cylindrical Si/Au core/shell nanostructures with conformal metal shells were successfully fabricated. Examining these structures as optical cavities using both optical simulations and experimental extinction measurements, we found that the structures support Mie resonances with quality factors enhanced up to ∼30 times compared with pure dielectric structures and plasmon resonances with optical confinement enhanced up to ∼5 times compared with pure metallic structures. Interestingly, extinction spectra of both Mie and plasmon resonances yield Fano line shapes, whose manifestation can be attributed to the combination of high quality factor resonances, Mie-plasmon coupling, and phase delay of the background optical field. This work demonstrates a bottom-up synthetic method for the production of freestanding, cylindrically symmetric semiconductor/metal core/shell nanowires that enables the efficient trapping of light on deep-subwavelength length scales for varied applications in photonics and optoelectronics.

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Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Epitaxially Grown Silicon Nanowires with a Gold Molecular Adhesion Layer for Core/Shell Structures with Compact Mie and Plasmon Resonances

Murphey,

Park,

Kim

et al. 2023

ACS Nano

Self Cite

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“…[175][176][177][178] The capillary force induced cold welding is a simple and high effective method of fabricating large area metal NNWs and 2D composite materials that deserves to be introduced here. [179][180][181][182][183][184][185][186][187][188][189][190][191][192] Figure 14d shows schematic diagram of the capillary force induced cold welding of MXexe and Ag NNW film. [189] The SEM image reveals that the MXexe and Ag NNW after capillary induced treatment was closely welded together tightly (Figure 14e).…”

Section: Applications Of Mechanical-assited Nanoweldingmentioning

confidence: 99%

“…In addition to low‐temperature heat‐assisted nanowelding, mechanical‐assisted nanowelding is also a common method for constructing metal NNW flexible transparent electrodes and nanoelectronic devices. [ 173–197 ] The large‐scale integration of 2D and metal NWs with low junction resistance is a substantial challenge in the development of high‐performance functional devices. Thus, roll‐to‐roll cold welding was proposed and used to self‐integrate copercolated 2D GO nanoplatelets and Ag NWs, as shown in Figure a.…”

Section: Nanowelding In the Construction And Self‐healing Of Integrat...mentioning

confidence: 99%

Nanowelding in Whole‐Lifetime Bottom‐Up Manufacturing: From Assembly to Service

Kang

Rao

et al. 2021

Small Methods

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“…During synthesis, a metal‐based nanocluster catalyst such as a gold primer is frequently used to define the diameter of the nanowires and trigger the VLS reaction. [ 9b,18 ] After the silicon nanowires start to grow, both the metal‐based nanocluster catalyst and the as‐grown silicon are exposed to the reactive chemical vapor in the chamber. The axial growth of the silicon nanowire relies on the decomposition of the vapor with the catalyst, whereas the shell growth occurs via the vapor decomposition over the silicon nanowire core.…”

Section: Synthesis Assembly and Properties Of Nanowires For Biointerf...mentioning

confidence: 99%

Semiconductor Nanowire‐Based Cellular and Subcellular Interfaces

Shi

Sun

Liang

et al. 2021

Adv Funct Materials

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The highly intricate structures of biological systems make the precise probing of biological behaviors at the cellular‐level particularly difficult. As an advanced toolset capable of exploring diverse biointerfaces, high‐aspect‐ratio nanowires stand out with their unique mechanical, optical, and electrical properties. Specifically, semiconductor nanowires show much promise in their tunability and feasibility for synthesis and fabrication. Thus far, semiconductor nanowires have shown favorable results in deciphering biological communications and translating this cellular language through the nanowire‐based biointerfaces. In this perspective, the synthesis and fabrication methods for different kinds of nanowires and nanowire‐based structures are first surveyed. Next, several cellular‐level nanowire‐enabled applications in biophysical dynamics probing, physiological or biochemical sensing, and biological activity modulation are highlighted. Then, the progress of functionalized nanowires in drug delivery and bioenergy production is reviewed. Finally, the current limitations of nanowires and an outlook into the next generation of nanowire‐based devices at the biointerfaces are concluded.

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Semi-transparent, flexible, and electrically conductive silicon mesh by capillarity-driven welding of vapor-liquid-solid-grown nanowires over large areas

Cited by 4 publications

References 42 publications

Epitaxially Grown Silicon Nanowires with a Gold Molecular Adhesion Layer for Core/Shell Structures with Compact Mie and Plasmon Resonances

Epitaxially Grown Silicon Nanowires with a Gold Molecular Adhesion Layer for Core/Shell Structures with Compact Mie and Plasmon Resonances

Nanowelding in Whole‐Lifetime Bottom‐Up Manufacturing: From Assembly to Service

Semiconductor Nanowire‐Based Cellular and Subcellular Interfaces

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