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Fabrication

About: Fabrication is a research topic. Over the lifetime, 20475 publications have been published within this topic receiving 235676 citations.


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30 Jun 1997
TL;DR: In this paper, the formation of nanocrystalline Si (nc-Si) in SiH4 plasma using a pulsed-H2 gas supply by very-high-frequency (VHF; 144 MHz) excitation was investigated.
Abstract: We have investigated the formation of nanocrystalline Si (nc-Si) in SiH4 plasma using a pulsed-H2 gas supply by very-high-frequency (VHF; 144 MHz) excitation. Nanocrystalline Si is formed in the gas phase of a SiH4 plasma cell by the coalescence of radicals. The particle size of nc-Si is determined by the growth time of nc-Si in the plasma cell. Supplying H2 into SiH4 plasma enhances nucleation of nc-Si. When the H2 gas supply is turned off, nucleated nc-Si particles grow larger in SiH4 plasma. In the next cycle of H2 gas supply, nc-Si particles grown in the previous cycle are pushed out of the cell into the deposition chamber. Using this method, fabrication of nc-Si with a diameter around 8 nm and a narrow spread (±1 nm) of particle size was realized.

110 citations

Journal ArticleDOI
TL;DR: In this paper, high-aspect ratio wires were found to form spontaneously at the air/water interface at the nano-level in the form of a 1-part-1 lattice.
Abstract: Arrays of high-aspect ratio “wires”, assembled from organically functionalized silver nanocrystals, were found to form spontaneously at the air/water interface. For all cases, the wires were 1 part...

110 citations

Journal ArticleDOI
TL;DR: In this article, a low-cost, large-scale method of fabricating biomimetic dry adhesives is presented. And the results indicate that the cap diameters relative to post diameters for mushroom-shaped fibers dominate the adhesion properties.
Abstract: We present a low-cost, large-scale method of fabricating biomimetic dry adhesives. This process is useful because it uses all photosensitive polymers with minimum fabrication costs or complexity to produce molds for silicone-based dry adhesives. A thick-film lift-off process is used to define molds using AZ 9260 photoresist, with a slow acting, deep UV sensitive material, PMGI, used as both an adhesion promoter for the AZ 9260 photoresist and as an undercutting material to produce mushroom-shaped fibers. The benefits to this process are ease of fabrication, wide range of potential layer thicknesses, no special surface treatment requirements to demold silicone adhesives and easy stripping of the full mold if process failure does occur. Sylgard® 184 silicone is used to cast full sheets of biomimetic dry adhesives off 4" diameter wafers, and different fiber geometries are tested for normal adhesion properties. Additionally, failure modes of the adhesive during fabrication are noted and strategies for avoiding these failures are discussed. We use this fabrication method to produce different fiber geometries with varying cap diameters and test them for normal adhesion strengths. The results indicate that the cap diameters relative to post diameters for mushroom-shaped fibers dominate the adhesion properties.

109 citations

Journal ArticleDOI
TL;DR: In this article, a review illustrates the fabrication of different kinds of micro-pillar array structures by ink-jet printing process and reveals how the main characteristics of the micropillar array structure strongly depend on the conditions of fabrication (configuration of the deposit, driving parameters of the printing head, delay between two successive layers, etc) and on the formulation of the ceramic suspensions.
Abstract: This review illustrates the fabrication of different kinds of micro-pillar array structures by ink-jet printing process So the fabrication of 1–3 piezoelectric composites and photocatalytic devices by deposition, respectively of PZT and TiO2 suspensions will be mainly reported First, different investigations were carried out to adjust the ceramic suspensions to be compatible with ink-jet printing process Afterwards, this study reveals how the main characteristics of the micro-pillar array structures (morphology, definition, compacity, etc) strongly depend on the conditions of fabrication (configuration of the deposit, driving parameters of the printing head, delay between two successive layers, etc) and on the formulation of the ceramic suspensions (ceramic loading, nature and content of binder and surfactant, etc) Finally, sintered PZT and TiO2 micro-pillar structures were achieved with a very good definition (around 40 μm) The study of the functional properties of the corresponding structures is in progress

109 citations

Journal ArticleDOI
TL;DR: It is shown that polymer optical fibers provide a very flexible route towards THz wave guiding and crucial incentives include the large variety of the low-cost and relatively low absorption loss polymers, the facile fiber preform fabrication by molding, drilling, stacking and extrusion, and finally, the simple fabrication through fiber drawing at low forming temperatures.
Abstract: We outline the most recent technological advancements in the design, fabrication and characterization of polymer microstructured optical fibers (MOFs) for applications in the terahertz waveband. Focusing on specific experimental demonstrations, we show that polymer optical fibers provide a very flexible route towards THz wave guiding. Crucial incentives include the large variety of the low-cost and relatively low absorption loss polymers, the facile fiber preform fabrication by molding, drilling, stacking and extrusion, and finally, the simple fabrication through fiber drawing at low forming temperatures.

109 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20235,291
202210,627
2021845
2020805
2019944