Multifunctional Material Structures Based on Laser-Etched Carbon Nanotube Arrays

Emplit, Aline; Tooten, Ester; Xhurdebise, Victor; Huynen, Isabelle

doi:10.3390/mi5030756

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…The used laser is a Q-Switch picosecond laser assembled by Oxford Lasers Ltd. [40], powered with laser source fabricated by Coherent, Inc, operating in the ultraviolet (UV) range at 355 nm wavelength. Its use was previously illustrated for the micromachining of carbonated nanostructures [41]. This “pico-second” corresponds to the order of magnitude of the duration of the laser pulses and is therefore not directly related to their frequency.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Microwave Devices Based on Magnetic Nanowires Using a Laser-Assisted Process

2019

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This paper compares two laser-assisted processes developed by the authors for the fabrication of microwave devices based on nanowire arrays loaded inside porous alumina templates. Pros and cons of each process are discussed in terms of accuracy, reproducibility and ease of fabrication. A comparison with lithography technique is also provided. The efficiency of the laser-assisted process is demonstrated through the realization of substrate integrated waveguide (SIW) based devices. A Nanowired SIW line is firstly presented. It operates between 8.5 and 17 GHz, corresponding to the first and second cut-off frequency of the waveguide, respectively. Next, a Nanowired SIW isolator is demonstrated. It shows a nonreciprocal isolation of 12 dB (corresponding to 4.4 dB/cm), observed in absence of a DC magnetic field, and achieved through an adequate positioning of ferromagnetic nanowires inside the waveguide cavity.

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Section: Methodsmentioning

confidence: 99%

Fabrication of Microwave Devices Based on Magnetic Nanowires Using a Laser-Assisted Process

2019

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“…The Gradient Model has also been implemented to deduce the sheet resistance so as to finally give a corrected definition of the conductive loss designated by

α_{c}^{GM}

. The classical definition 35 of conductive loss α c . without any modification due to roughness is also drawn as a reference.…”

Section: Parametric Analysismentioning

confidence: 99%

Design of substrate integrated waveguides based on nanowires: Numerical guidelines

Kerckhoven

Piraux

Huynen

2021

Int J Numerical Modelling

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A thorough study of the parameters influencing the operation of devices based on nanowired alumina substrate is presented. The basic structures are realized by growing metallic nanowires inside alumina porous substrate. The control of the areas wherein growth occurs allows building of various microwave devices supported on the filled template. The performances of these devices depend on the material parameters and topology/geometry in presence. These devices have the particularity to combine nanoscale, through the use of nanowires, and millimeter scale that is characteristic of microwave devices and their associated operating wavelength. The gap between the two‐scale ranges implies that analytical models and numerical simulation tools have to be combined to modelize and design performant microwave devices, such as Nanowired Substrate Integrated Waveguides (NSIWs) devices that are the subject of the paper. A deep parametric analysis of the properties and operation of the basic NSIW is presented and is followed by the illustration of two designs: a simple NSIW line, and an EBG NSIW filter.

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“…Patterned growth of CNTs on the scale of tenths of micrometers has been successfully reported on silica [ 12 – 14 ], silicon substrates [ 15 ], and also on predeposited catalyst [ 16 – 18 ]. On the other hand, the patterning of predeposited catalyst at the nanoscale, which would enable uniform, vertically aligned SWNT forest growth on various shapes of nanosize structures, is still challenging and is yet to be achieved [ 17 , 19 – 21 ]. High-quality CNT structures with various shapes were achieved by utilizing different fabrication methods.…”

Section: Introductionmentioning

confidence: 99%

“…Standard lithography methods, like photolithography [ 16 , 22 ], electron beam lithography (EBL) [ 23 ], or soft-lithography [ 24 ] enabled the growth of fine CNT patterns. A laser machining method was used for the fabrication of one-dimensional grating patterns [ 25 ], while a laser etching method was utilized to obtain microstructures of CNT brushes [ 21 ]. Moreover, the patterned growth of CNTs was also achieved using anodic aluminum oxide (AAO) templates [ 26 ] and inkjet printing of the catalyst [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

FIB Secondary Etching Method for Fabrication of Fine CNT Forest Metamaterials

2017

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Anisotropic materials, like carbon nanotubes (CNTs), are the perfect substitutes to overcome the limitations of conventional metamaterials; however, the successful fabrication of CNT forest metamaterial structures is still very challenging. In this study, a new method utilizing a focused ion beam (FIB) with additional secondary etching is presented, which can obtain uniform and fine patterning of CNT forest nanostructures for metamaterials and ranging in sizes from hundreds of nanometers to several micrometers. The influence of the FIB processing parameters on the morphology of the catalyst surface and the growth of the CNT forest was investigated, including the removal of redeposited material, decreasing the average surface roughness (from 0.45 to 0.15 nm), and a decrease in the thickness of the Fe catalyst. The results showed that the combination of FIB patterning and secondary etching enabled the growth of highly aligned, high-density CNT forest metamaterials. The improvement in the quality of single-walled CNTs (SWNTs), defined by the very high G/D peak ratio intensity of 10.47, demonstrated successful fine patterning of CNT forest for the first time. With a FIB patterning depth of 10 nm and a secondary etching of 0.5 nm, a minimum size of 150 nm of CNT forest metamaterials was achieved. The development of the FIB secondary etching method enabled for the first time, the fabrication of SWNT forest metamaterials for the optical and infrared regime, for future applications, e.g., in superlenses, antennas, or thermal metamaterials. Electronic supplementary materialThe online version of this article (doi:10.1007/s40820-017-0145-5) contains supplementary material, which is available to authorized users.

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Multifunctional Material Structures Based on Laser-Etched Carbon Nanotube Arrays

Cited by 6 publications

References 11 publications

Fabrication of Microwave Devices Based on Magnetic Nanowires Using a Laser-Assisted Process

Fabrication of Microwave Devices Based on Magnetic Nanowires Using a Laser-Assisted Process

Design of substrate integrated waveguides based on nanowires: Numerical guidelines

FIB Secondary Etching Method for Fabrication of Fine CNT Forest Metamaterials

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