Biotemplate Synthesis of Ag Nanoparticles and Nanowires

2004 ◽  
Vol 818 ◽  
Author(s):  
S. Behrens ◽  
E. Unger ◽  
J. Wu ◽  
W. Habicht ◽  
E. Dinjus
Keyword(s):  
Aspect Ratio ◽  
Chemical Reaction ◽  
High Aspect Ratio ◽  
Ag Nanoparticles ◽  
Protein Structures ◽  
Tubular Structure ◽  
Metal Nanostructures ◽  
Protein Assemblies ◽  
Ag Nanowires

AbstractWe address the template-directed deposition of metals on microtubule supports for generating metal nanostructures with different morphologies. Microtubules are highly ordered protein assemblies of tubular structure with a high aspect ratio. In this approach, the biostructure serves as a functionalised scaffold where the metal is generated in situ and shaped into a nanostructure with its morphology complementary to that of the biotemplate. When the biotemplate is coupled to an appropriate chemical reaction, different Ag / protein structures are produced, ranging from microtubules densely covered by small Ag nanoparticles to continuous Ag nanowires.

Mixed polyvinyl pyrrolidone hydrogel-mediated synthesis of high-quality Ag nanowires for high-performance transparent conductors

2020 ◽  
Vol 8 (40) ◽  
pp. 21062-21069
Author(s):  
Mei Han ◽  
Yongjie Ge ◽  
Jianfang Liu ◽  
Zhongzhong Cao ◽  
Moxia Li ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Ag Nanoparticles ◽  
High Performance ◽  
Reduction Method ◽  
Transparent Conductors ◽  
Polyvinyl Pyrrolidone ◽  
High Quality ◽  
Capping Layer ◽  
Ag Nanowires

A novel mixed PVP hydrogel-mediated polyol reduction method was developed for the synthesis of high-quality Ag nanowires with negligible Ag nanoparticles produced, high aspect ratio (exceeding 1200), and a thin (∼1 nm) capping layer.

Laser in-situ synthesis of high aspect ratio TiB fiber bundle reinforced titanium matrix composite coating

2019 ◽  
Vol 115 ◽  
pp. 364-373 ◽  
Author(s):  
Yinghua Lin ◽  
Changchun Jiang ◽  
Zhenheng Lin ◽  
Qingtang Chen ◽  
Yongping Lei ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Composite Coating ◽  
Matrix Composite ◽  
High Aspect Ratio ◽  
Fiber Bundle ◽  
In Situ Synthesis ◽  
Titanium Matrix ◽  
Titanium Matrix Composite

scholarly journals Far-field midinfrared superresolution imaging and spectroscopy of single high aspect ratio gold nanowires

2020 ◽  
Vol 117 (5) ◽  
pp. 2288-2293 ◽  
Author(s):  
Kyle Aleshire ◽  
Ilia M. Pavlovetc ◽  
Robyn Collette ◽  
Xiang-Tian Kong ◽  
Philip D. Rack ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Optical Measurement ◽  
Near Field ◽  
Metal Nanostructures ◽  
Gold Nanowires ◽  
Far Field ◽  
Ambient Conditions ◽  
Fabry Perot ◽  
Imaging And Spectroscopy

Limited approaches exist for imaging and recording spectra of individual nanostructures in the midinfrared region. Here we use infrared photothermal heterodyne imaging (IR-PHI) to interrogate single, high aspect ratio Au nanowires (NWs). Spectra recorded between 2,800 and 4,000 cm−1 for 2.5–3.9-μm-long NWs reveal a series of resonances due to the Fabry–Pérot modes of the NWs. Crucially, IR-PHI images show structure that reflects the spatial distribution of the NW absorption, and allow the resonances to be assigned to the m = 3 and m = 4 Fabry–Pérot modes. This far-field optical measurement has been used to image the mode structure of plasmon resonances in metal nanostructures, and is made possible by the superresolution capabilities of IR-PHI. The linewidths in the NW spectra range from 35 to 75 meV and, in several cases, are significantly below the limiting values predicted by the bulk Au Drude damping parameter. These linewidths imply long dephasing times, and are attributed to reduction in both radiation damping and resistive heating effects in the NWs. Compared to previous imaging studies of NW Fabry–Pérot modes using electron microscopy or near-field optical scanning techniques, IR-PHI experiments are performed under ambient conditions, enabling detailed studies of how the environment affects mid-IR plasmons.

Solidification Processing Routes to High Aspect Ratio Reinforcements in γ-TiAl

1990 ◽  
Vol 194 ◽  
Author(s):  
J. J. Valencia ◽  
J. P. A. Löfvander ◽  
J. Rösler ◽  
C. G. Levi ◽  
R. Mehrabian
Keyword(s):  
Solid Solution ◽  
Aspect Ratio ◽  
Creep Strength ◽  
High Aspect Ratio ◽  
Anisotropic Growth ◽  
Solidification Processing ◽  
Aspect Ratios ◽  
The Matrix ◽  
Solute Strengthening

AbstractAdditions of ∼5%B1 and ∼9%Ta to binary γ-TiAl result in the formation of a monoboride isomorphous with TiB but containing Ta in solid solution. This boride exhibits strongly anisotropic growth from the melt, producing rod-like primary phases which are of potential interest for creep strengthening of the γ matrix. Fibrous borides with aspect ratios larger than ∼20 and volume fractions of ∼0.12 have been produced in arc-melted Ti-48AI-9Ta-4.3B alloys. Creep testing at 1255 K indicates that these “in-situ” composites have much higher creep strength than γ-TiAl, but the contribution of the reinforcements is relatively small compared with the solute-strengthening of the matrix.

Synthesis and Photoelectrocatalytic Property of Two-Nonmetal-Codoped TiO2 Nanotube Arrays with High Aspect Ratio

2011 ◽  
Vol 412 ◽  
pp. 219-222 ◽  
Author(s):  
Hai Da Liao ◽  
Wei Ping Zhang ◽  
Xiao Ming Sun ◽  
Liang Shi ◽  
Ming Feng Qin
Keyword(s):  
Methyl Orange ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Mixed Crystal ◽  
Nanotube Arrays ◽  
Xenon Lamp ◽  
Metallic Elements ◽  
Nanotube Array ◽  
Natural Lighting

Electrolyte containing F–was employed to conduct two-step anodic oxidation. Through adjustment of the composition of electrolyte, TiO2nanotube array with high aspect ratio was grown in situ on Ti matrix, and meanwhile the binary doping with non-metallic elements, namely, F and S, was achieved. Using FSEM, XRD and EDS, the characterization on the topography, structure and doped elements of TiO2nanotubes were performed. Taking methyl orange as the target degradation substance and using xenon lamp to simulate natural lighting, the comparison between the doped non-high-aspect-ratio nanotube and the doped high-aspect-ratio nanotube was made to investigate the related photoelectrocatalytic property. The results showed that the photoelectrocatalytic property of doped nanotube with high aspect ratio was significantly superior to that with non-high aspect ratio. The mixed crystal ratio of anatase and rutile obtained after calcination for 2h at 500°C enabled higher photoelectrocatalytic activity of TiO2nanotube array.

A parametric study on synthesis of Ag nanowires with high aspect ratio

2017 ◽  
Vol 28 (17) ◽  
pp. 12415-12424 ◽  
Author(s):  
Cheng-Tang Pan ◽  
Tsung-Lin Yang ◽  
Kun-Hao Hung ◽  
Shin-Pon Ju
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Parametric Study ◽  
Ag Nanowires

High-Rate Etching of Mn-Zn Ferrite by Laser-Induced Chemical Reaction in CC12F2 Atmosphere

1990 ◽  
Vol 201 ◽  
Author(s):  
Y. F. Lu ◽  
M. Takai ◽  
S. Nagatomo ◽  
S. Namba
Keyword(s):  
Aspect Ratio ◽  
Chemical Reaction ◽  
High Aspect Ratio ◽  
Dwell Time ◽  
Gas Pressure ◽  
High Rate ◽  
Aspect Ratios ◽  
Zn Ferrite ◽  
Order Of Magnitude ◽  
Ion Laser

AbstractMaskless dry etching of Mn-Zn ferrite in dich1orodif1uoromethane (CC12F2) by Ar+-ion laser (514.5 nm-line) irradiation has been investigated to obtain high etching rates and aspect-ratios of etched grooves. The etching reaction was found to be thermochemical and caused by Cl radicals thermally decomposed from CCl2F2 gas. High etching rates of up to 360 μm/s, which is about one order of magnitude higher than that in a CCl4 gas and even higher than that in a H3PO4 solution, have been achieved. A high aspect-ratio of up to 12 was obtained. Definite gas pressure and dwell time are necessary to fabricate a smooth groove.

scholarly journals Microfabrication of High-Aspect Ratio KNN Lead-Free Piezoceramic Pillar Arrays by Aqueous Gelcasting

Ceramics ◽  
2020 ◽  
Vol 3 (3) ◽  
pp. 287-296
Author(s):  
Cailing Wu ◽  
Benke Li ◽  
Xiaofeng Wang ◽  
Feng Ji ◽  
Dou Zhang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Lead Free ◽  
Solid Loading ◽  
High Mechanical Strength ◽  
Pillar Array ◽  
Novel Approach ◽  
Pillar Arrays ◽  
Gelcasting Process

The present paper reported a novel approach for the fabrication of a high-aspect ratio (K, Na)NbO3 (KNN) piezoelectric micropillar array via epoxy gelcasting, which involves the in situ consolidation of aqueous KNN suspensions with added hydantoin epoxy resin on a polydimethylsiloxane (PDMS) soft micromold. KNN suspensions with solid loadings of up to 45.0 vol.% have rheological behavior, which was suitable for the gelcasting process. The uniform green KNN bodies derived from the optimized suspension of 42.0 vol.% solid loading and 15.0 wt.% resin had exceptionally high mechanical strength (9.14 MPa), which was responsible for the integrity of the piezoceramic micropattern structure. The square-shaped KNN piezoelectric pillar array with lateral dimensions of up to 5 μm and an aspect ratio of up to five was successfully fabricated.

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