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 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 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.

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.

Fabrication and Characterization of High Aspect Ratio Conducting Polymer Fibers

2009 ◽  
Vol 1240 ◽  
Author(s):  
Miguel A. Saez ◽  
Lauren Montemayor ◽  
Priam Vasudevan Pillai ◽  
Ian W Hunter
Keyword(s):  
Aspect Ratio ◽  
Cross Sections ◽  
High Aspect Ratio ◽  
Strain Sensing ◽  
Free Standing ◽  
3 Dimensional ◽  
Smart Fabrics ◽  
Sensing Applications ◽  
Glassy Carbon Crucible

AbstractElectroactive conducting polymers are currently studied for use in smart textiles that incorporate sensing, actuation, control, and data transmission. The development of intelligent garments that integrate these various functionalities over wide areas (i.e. the human body) requires the production of long, highly conductive, and mechanically robust fibers. This study focuses on the electrical, mechanical and electrochemical characterization of high aspect ratio polypyrrole fibers produced using a novel, custom-built fiber slicing instrument. In order to ensure high conductivity and mechanical robustness, the fibers are sliced from tetra-ethylammonium hexafluorophosphate-doped polypyrrole thin films electrodeposited onto a glassy carbon crucible. The computer-controlled, four-axis slicing instrument precisely cuts the film into thin, long fibers by running a sharp blade over the crucible in a continuous helical pattern. This versatile fabrication process has been used to produce free-standing fibers with square cross-sections of 2 μm × 3 μm, 20 μm × 20 μm, and 100 μm × 20 μm with lengths of 15 mm, 460 mm, and 1,200 mm, respectively. An electrochemical dynamic mechanical analyzer built in-house for nano- and microfiber testing was used to perform stress-strain and conductivity measurements in air. The fibers were found to, on average, have an elastic modulus of 1.7 GPa, yield strength of 37 MPa, ultimate tensile strength of 80 MPa, elongation at break of 49%, and an electrical conductivity of 12,700 S/m. SEM micrographs show that the fibers are free of defects and have cleanly cut edges. Preliminary measurements of the fibers’ strain-resistance relationship have resulted in gage factors suitable for strain sensing applications. Initial tests of the actuation performance of fibers in neat 1-butyl-3-methylimidazolium hexaflourophosphate have shown promising results. These monofilament fibers may be spun into yarns or braided into 2- and 3-dimensional structures for use as actuators, sensors, antennae, and electrical interconnects in smart fabrics.

scholarly journals Advances on Sensors Based on Carbon Nanotubes

2018 ◽  
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.

scholarly journals Combining sonicated cold development and pulsed electrodeposition for high aspect ratio sub-10 nm gap gold dimers for sensing applications in the visible spectrum

Nanoscale ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 5221-5228 ◽  
Author(s):  
Aaron D. Mueller ◽  
Landobasa Y. M. Tobing ◽  
Dao Hua Zhang
Keyword(s):  
High Resolution ◽  
Aspect Ratio ◽  
Electrochemical Deposition ◽  
High Aspect Ratio ◽  
Visible Spectrum ◽  
Deposition Technique ◽  
Sensing Applications ◽  
Pulsed Electrodeposition

We demonstrate a high resolution electrochemical deposition technique to realize dimers with high aspect ratio nanometric gaps suitable for sensing.

scholarly journals Hybrid Photonic Crystal-Surface Plasmon Polariton Waveguiding System for On-Chip Sensing Applications

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 864
Author(s):  
Reyhaneh Jannesari ◽  
Banafsheh Abasahl ◽  
Thomas Grille ◽  
Bernhard Jakoby
Keyword(s):  
Photonic Crystal ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Large Scale ◽  
Crystal Surface ◽  
Field Enhancement ◽  
Strong Light ◽  
Sensing Applications ◽  
Photonic Sensors ◽  
On Chip

In this paper, a hybrid optical guiding system based on low group velocity offered by photonic crystal (PhC) waveguides and vertical confinement as well as high field enhancement of. Surface lasmon polaritons (SPP) is proposed. We show that for efficient sensing, conventional two-dimensional PhC waveguides with finite height require a high aspect ratio in the order of 30 in order to efficiently confine the guiding mode. The fabrication of devices with such a high aspect ratio is considered too challenging and inefficient for mass production. By combining a PhC waveguide and SPPs, the proposed system efficiently confines the optical mode vertically while benefiting from the lateral confinement enabled by PhC structures. As a result, the required aspect ratio drops to about 4 making the fabrication in large scale feasible. This design provides strong light-matter interaction within small dimensions, which is beneficial for miniaturizing on-chip photonic sensors.

High Aspect Ratio Plasmonic Nanostructures for Sensing Applications

ACS Nano ◽  
2011 ◽  
Vol 5 (8) ◽  
pp. 6374-6382 ◽  
Author(s):  
Birgit Päivänranta ◽  
Hannes Merbold ◽  
Reto Giannini ◽  
Luca Büchi ◽  
Sergey Gorelick ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Plasmonic Nanostructures ◽  
Sensing Applications
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