scholarly journals Synthesis of High Aspect-Ratio Gold Nanowires with Highly Porous Morphology

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Lucas P. Johnson ◽  
Janis G. Matisons
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Volume Ratio ◽  
Accessible Surface Area ◽  
Gold Nanowires ◽  
Porous Gold ◽  
Sensing Applications ◽  
Accessible Surface ◽  
Porous Morphology ◽  
Highly Porous

Here, we demonstrate the formation of porous gold nanowires with diameters <60 nm by a two-step process involving the successive electrodeposition of silver then gold into the pores of a track-etched polycarbonate filtration membrane, followed by treatment with nitric acid. The resulting nanowires possess a unique, highly porous morphology, which yields a very high accessible surface area to volume ratio compared to solid nanowires of the same dimensions. Combined with the high aspect ratio of these particles (which allows for easy isolation from solution), this makes them eminently suitable for use in catalysis and sensing applications. The formation of such porous gold nanostructures was ascertained to result from the low diffusivity of the silver species within the narrow membrane pores.

scholarly journals ZnO Modified High Aspect Ratio Carbon Electrodes for Hydrogen Sensing Applications

2011 ◽  
Vol 25 ◽  
pp. 1669-1672 ◽  
Author(s):  
Umesh Singh ◽  
Hyun Ae Lee ◽  
Young-Chul Byun ◽  
Amit Kumar ◽  
Sudipta Seal ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Carbon Electrodes ◽  
Hydrogen Sensing ◽  
Sensing Applications

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.

scholarly journals Uniform Fabrication of Moems Arrays Using Dry Thick Resist Films

Proceedings ◽  
2017 ◽  
Vol 1 (4) ◽  
pp. 551
Author(s):  
Thierry Camps ◽  
Sami Abada ◽  
Benjamin Reig ◽  
Jean-Baptiste Doucet ◽  
Rémi Courson ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Laser Beam ◽  
Thermal Behavior ◽  
High Aspect Ratio ◽  
Microfluidic Channel ◽  
Uv Exposure ◽  
Microlens Arrays ◽  
Sensing Applications ◽  
Printing Technique

This study aims at focusing a laser beam at the center of a microfluidic channel for optical bio-sensing applications thanks to the collective integration of tunable microlens arrays on VCSELs devices. High aspect-ratio polymer-based MOEMS are successfully fabricated on small-sized samples using thick dry photoresist films. Such dry films are easier to use and less expensive than standard thick SU-8 and can be efficiently stacked on fragile GaAs samples using a soft-thermal-printing technique. By combining double UV exposure and planar metallization, uniform fabrication of MOEMS arrays is enabled and fabricated devices exhibit reproducible electro-thermal behavior.

scholarly journals Correction: High-aspect-ratio water-dispersed gold nanowires incorporated within gelatin methacrylate hydrogels for constructing cardiac tissues in vitro

2020 ◽  
Author(s):  
Xiao-Pei Li ◽  
Kai-Yun Qu ◽  
Feng Zhang ◽  
Han-Ning Jiang ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Gold Nanowires ◽  
Cardiac Tissues ◽  
Dispersed Gold

Correction for ‘High-aspect-ratio water-dispersed gold nanowires incorporated within gelatin methacrylate hydrogels for constructing cardiac tissues in vitro’ by Xiao-Pei Li et al., J. Mater. Chem. B, 2020, 8, 7213–7224, DOI: 10.1039/D0TB00768D.

High-aspect-ratio water-dispersed gold nanowires incorporated within gelatin methacrylate hydrogels for constructing cardiac tissues in vitro

2020 ◽  
Vol 8 (32) ◽  
pp. 7213-7224 ◽  
Author(s):  
Xiao-Pei Li ◽  
Kai-Yun Qu ◽  
Feng Zhang ◽  
Han-Ning Jiang ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Cardiac Tissue ◽  
Gold Nanowires ◽  
Tissue Formation ◽  
Cardiac Tissues ◽  
Cardiomyocyte Culture ◽  
Dispersed Gold

The prepared high-aspect-ratio water-dispersed gold nanowires are incorporated into GeIMA hydrogels for cardiomyocyte culture and micro-cardiac tissue formation.

scholarly journals Advances on Sensors Based on Carbon Nanotubes

Chemosensors ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 62 ◽  
Author(s):  
Luca Camilli ◽  
Maurizio Passacantando
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Properties ◽  
Carbon Nanotube ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Sensing Applications ◽  
Proper Modification ◽  
Pressure Changes

Carbon nanotubes have been attracting considerable interest among material scientists, physicists, chemists, and engineers for almost 30 years. Owing to their high aspect ratio, coupled with remarkable mechanical, electronic, and thermal properties, carbon nanotubes have found application in diverse fields. In this review, we will cover the work on carbon nanotubes used for sensing applications. In particular, we will see examples where carbon nanotubes act as main players in devices sensing biomolecules, gas, light or pressure changes. Furthermore, we will discuss how to improve the performance of carbon nanotube-based sensors after proper modification.

Growth of High-Aspect-Ratio Gold Nanowires on Silicon by Surfactant-Assisted Galvanic Reductions

Langmuir ◽  
2008 ◽  
Vol 24 (11) ◽  
pp. 5647-5649 ◽  
Author(s):  
Ting-Kai Huang ◽  
Ying-Chieh Chen ◽  
Hsin-Chun Ko ◽  
Hsin-Wei Huang ◽  
Chia-Hsin Wang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Gold Nanowires ◽  
Surfactant Assisted
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