Electromagnetic interference shielding in X-band with aero-GaN

Abstract

We investigate the electromagnetic shielding properties of an ultra-porous lightweight nanomaterial named aerogalnite (aero-GaN). Aero-GaN is made up of randomly arranged hollow GaN microtetrapods, which are obtained by direct growth using hydride vapor phase epitaxy of GaN on the sacrificial network of ZnO microtetrapods. A 2 mm thick aero-GaN sample exhibits electromagnetic shielding properties in the X-band similar to solid structures based on metal foams or carbon nanomaterials. Aero-GaN has a weight four to five orders of magnitude lower than the weight of metals.

Highly Porous and Ultra-Lightweight Aero-Ga2O3: Enhancement of Photocatalytic Activity by Noble Metals

“…The sacrificial network of ZnO microtetrapods was prepared by a simple flame transport approach, which is described elsewhere [ 34 ]. So far, new aero-materials such as aerographite [ 35 ], aero-GaN [ 36 , 37 , 38 ], aero-ZnS [ 39 ], aero-BN [ 40 ], and aero-Si [ 41 ] have been realized by templating the ZnO network. For example, the aerographite is produced via the transformation of the sacrificial ZnO microtetrapod network into graphitic microtubes in a one-step chemical vapor deposition (CVD) process with toluene as the carbon source [ 35 ].…”

“…The new aero-Ga 2 O 3 is produced by a two-step process schematically represented in Figure 1 a. Aero-GaN is first obtained by transforming the ZnO microtetrapods into GaN microtubes in a hydride vapor phase epitaxy (HVPE) process using hydrochloride (HCl), metallic gallium (Ga), and ammonia precursors as described in previous reports [ 36 , 37 , 38 ]. Gallium chloride (GaCl) is formed in the source zone, where gaseous HCl interacts with liquid Ga in the first stage of this process, while GaN is formed in the reaction zone via a chemical reaction between the gaseous molecules of GaCl and NH 3 .…”

Aero-Ga2O3 Nanomaterial Electromagnetically Transparent from Microwaves to Terahertz for Internet of Things Applications

“…The freestanding samples were exposed to electromagnetic radiation. The microwave characterization of the aero-Ga 2 O 3 pellets was carried out by means of a VNA (Vector Network Analyzer) connected to a WR90 waveguide-based set-up suitable for measurements in the X-band (i.e., 8.2-12.4 GHz) [13]. A schematics of the waveguide is presented in Figure 1, where a = 22.86 mm and b = 10.16 mm.…”

Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals

“…Its wide bandgap makes it also very promising for applications at the telecommunication wavelength of 1550 nm, for which both the twoand the three-photon absorption cannot take place. Electromagnetic interference shielding in an ultra-broad range of frequencies, distributed Bragg reflectors and UV-light driven fluorescent microengines are among the emergent applications of this compound when engineered in three-dimensional nanoarchitectures [10][11][12][13][14][15].…”