Graphene-based plastic absorber for total sub-terahertz radiation shielding

Zdrojek, Mariusz; Bomba, Jarosław; Łapińska, Anna; Dużyńska, Anna; Żerańska-Chudek, Klaudia; Suszek, Jarosław; Stobiński, Leszek; Taube, Andrzej; Sypek, Maciej; Judek, Jarosław

doi:10.1039/c8nr02793e

Cited by 51 publications

(32 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the broad terahertz range 0.3-2.1 THz, a linear relation between SWNT loading and SE has been found. In the low frequency range 0.3-0.6 THz, the SE exhibits low F I G U R E 6 Shielding effectiveness of carbon-based composites at 0.5-0.6 THz; a -Macutkevic et al (2012), [30] b -Macutkevic et al (2012), [29] c -Macutkevic et al (2008), [31] d -Zdrojek et al (2018), [38] e -Das et al (2011), [28] f -Seo et al (2008), [27] g -Huang et al(2018), [39] h -Das et al (2012), [33] i -Venkatachalam et al, [40] j -Polley et al [41] values (10 dB) and the transmittance reaches 60%. However, the transmittance dropped almost to zero for frequencies above 2 THz.…”

Section: Carbon-based Polymer Compositesmentioning

confidence: 99%

“…Recently Zdrojek et al. [ 38 ] presented a series of nonconductive PDMS composites containing three different contents of graphene flakes inclusions (0.1, 0.2, and 10 wt.%), fabricated via a simple blend‐mixing method. The samples in form of flat disks, approximately 0.8 mm thick were tested within 0.1–0.8 THz using a custom made THz‐TDS setup.…”

Section: Carbon‐based Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Carbon‐based terahertz absorbers: Materials, applications, and perspectives

et al. 2020

Self Cite

View full text Add to dashboard Cite

Terahertz (THz) waves are nowadays used in a multitude of applications ranging from medicine, telecommunication, security surveillance, to fast sensing and imaging. Along with the most apparent aspects of the potential applications, there is also a flip side of the coin: the effects of unwanted electromagnetic pollution on various elements of the environment. Therefore, an effective shielding of THz radiation, preferably with an appreciable amount of absorption, is one of the milestones for the further development of terahertz technology. This review briefly outlines the main aspects of the area of research in terahertz absorbers, materials used, and their specific applications. Particular attention has been paid to the use of carbon-based materials as terahertz absorbers, needed to fill the gap between the well-known components across absorption coefficient 10-100 cm −1 for a refractive index 3-5. An example of such a class of materials is that of the organic or hybrid organic-inorganic polymers whose pyrolysis in an inert atmosphere gives black materials containing a residual free carbon phase. The carbon phase is a random network of covalent bonds in which carbon atoms are mainly in sp 2 hybridization state. The absorption of THz radiation is strongly dependent on the state of arrangement of C-sp 2 , the amount of carbon, and the graphitic carbon domain size. K E Y W O R D S absorbers, carbon, composites, submillimeter waves, terahertz 1 INTRODUCTION TO TERAHERTZ DOMAIN Terahertz (THz) waves are the electromagnetic (EM) waves covering the frequency gap that lies between microwaves and infrared radiations (Figure 1). The THz domain corresponds to frequencies of 0.3 THz-10 THz, which is equivalent to the wavelengths from 1 mm to 30 µm. [1] This EM This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Section: Carbon-based Polymer Compositesmentioning

confidence: 99%

Section: Carbon‐based Materialsmentioning

confidence: 99%

Carbon‐based terahertz absorbers: Materials, applications, and perspectives

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The specific nanofiller loading was chosen based on our previous works on PDMS composites containing graphene inclusions, where we showed the influence of graphene loading on optical properties of fabricated composites. 10,20 For reference, a sample containing no additives was also fabricated. All composites were fabricated in the form of a flat flexible slab 700 μm ± 20% thick (see Figure 1(b)).…”

Section: Sample Fabricationmentioning

confidence: 99%

Terahertz time domain spectroscopy of graphene and MXene polymer composites

Żerańska-Chudek

Łapińska

Siemion

et al. 2020

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

The rising demand for faster and more efficient electronic devices forces electronics industry to shift toward terahertz frequencies. Therefore there is a growing need for efficient, lightweight, and easy to produce absorbing materials in the terahertz range for electromagnetic interference (EMI) shielding and related applications. This study presents a study on basic optical properties of two types polymer-based composites loaded with two-dimensional structures-graphene and MXene phases (Ti 2 C). In said range, total EMI shielding efficiency (SE) and its components, the absorption coefficient (α), refractive index, and complex dielectric function are investigated. The ratio of SE absorption component to reflection component (SE ABS :SE R) of fabricated composites is equal or higher than 30:1 in over 80% of studied range. The fabricated composites exhibit low (<0.1) loss tangent in studied range. The addition of 1 wt% of graphene increases the composite α over 10-fold in respect to pure polymer-up to 60 cm −1 for frequency higher than 2 THz.

show abstract

“…Compared with shielding materials based on the reflective mechanism, THz absorption materials demand both a very low reflection and transmission, which can eliminate THz radiations in the environment. For example, Zdrojek et al demonstrated a graphene‐based plastic absorber, and more than 99.99% of the electromagnetic energy is shielded via absorption in the sub‐THz range. The porous materials have a better shielding performance for their larger porosity .…”

Section: Introductionmentioning

confidence: 99%

Active Terahertz Shielding and Absorption Based on Graphene Foam Modulated by Electric and Optical Field Excitation

Fan

Cheng

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

Ultralight materials for broadband terahertz (THz) shielding and absorption are promising in practical THz applications. Here, active THz shielding and absorption properties of 3D graphene foam (GF) controlled by both laser pumping and biased electric field are investigated. The GF can be tuned from OFF‐shielding state to ON‐shielding state when the external field excitations are applied, and 10 dB shielding bandwidth expands from 0 to a broad band of 0.2–1.6 THz. Further researches show that the GF always keeps very low THz reflection either with or without external fields, but its absorption characteristics can be remarkably controlled from 13% to 95.4% at 0.3 THz by the power of the external excitations, and its specific average terahertz absorption performance increases from 3.9 × 103 to 1.95 × 104 dB cm3 g−1. This modulation mechanism reveals that the carrier density in GF increases one order of magnitude from 2.6 × 1014 cm−3 to 3.15 × 1015 cm−3. Finally, the tunable THz shielding and absorption characteristics of this GF device are demonstrated by THz transmission imaging, which shows its great potential applications in active THz imaging, radar, and electromagnetic compatibility.

show abstract

Graphene-based plastic absorber for total sub-terahertz radiation shielding

Cited by 51 publications

References 30 publications

Carbon‐based terahertz absorbers: Materials, applications, and perspectives

Carbon‐based terahertz absorbers: Materials, applications, and perspectives

Terahertz time domain spectroscopy of graphene and MXene polymer composites

Active Terahertz Shielding and Absorption Based on Graphene Foam Modulated by Electric and Optical Field Excitation

Contact Info

Product

Resources

About