Printable Aligned Single-Walled Carbon Nanotube Film with Outstanding Thermal Conductivity and Electromagnetic Interference Shielding Performance

Abstract

Ultrathin, lightweight, and flexible aligned single-walled carbon nanotube (SWCNT) films are fabricated by a facile, environmentally friendly, and scalable printing methodology. The aligned pattern and outstanding intrinsic properties render “metal-like” thermal conductivity of the SWCNT films, as well as excellent mechanical strength, flexibility, and hydrophobicity. Further, the aligned cellular microstructure promotes the electromagnetic interference (EMI) shielding ability of the SWCNTs, leading to excellent shielding effectiveness (SE) of ~ 39 to 90 dB despite a density of only ~ 0.6 g cm−3 at thicknesses of merely 1.5–24 µm, respectively. An ultrahigh thickness-specific SE of 25 693 dB mm−1 and an unprecedented normalized specific SE of 428 222 dB cm2 g−1 are accomplished by the freestanding SWCNT films, significantly surpassing previously reported shielding materials. In addition to an EMI SE greater than 54 dB in an ultra-broadband frequency range of around 400 GHz, the films demonstrate excellent EMI shielding stability and reliability when subjected to mechanical deformation, chemical (acid/alkali/organic solvent) corrosion, and high-/low-temperature environments. The novel printed SWCNT films offer significant potential for practical applications in the aerospace, defense, precision components, and smart wearable electronics industries.

Flower-like 1T/2H-MoS2@α-Fe2O3 with enhanced electromagnetic wave absorption capabilities in the low frequency range

“…It is foreseeable that the increasingly serious problems of electromagnetic interference and pollution will cause a great deal of harm in the near future, which is also an inevitable problem affecting human health. [1][2][3] Therefore, the development of ideal electromagnetic wave absorbers with thin thickness, wide absorption bandwidth, light weight and strong absorption strength is the core of the research to solve the serious impact of electromagnetic interference and pollution. 4 In order to acquire effective and high performance electromagnetic wave absorbing materials, especially in the low frequency range, the composition of materials, engineering of structures, and correct matching of different absorbers in nanostructures can be combined to control these characteristics to significantly improve their performance.…”

Polyoxometalate-immobilized carbon nanotube constructs triggered by host–guest assembly result in excellent electromagnetic interference shielding

“…9 Therefore, researchers have developed nanocomposites by mixing CNTs with graphene, MXene, and cellulose nanofillers to get better electromagnetic interference shielding efficiency. [8][9][10][11][12] The selection of MWCNTs is mainly governed by their excellent electron conductivity resulting from highly delocalized π-conjugated electrons and large surface areas. However, the brittleness and poor mechanical properties of the freestanding CNT paper in the absence of binders, due to the lack of strong interaction, severely constrain its practical application.…”

Bicontinuous, High-Strength, and Multifunctional Chemical-Cross-Linked MXene/Superaligned Carbon Nanotube Film

“…With the upgrading and proliferation of electronics, electromagnetic compatibility and health protection against electromagnetic interference (EMI) or radiation have gained attention. The scalable manufacturing of high-performance EMI shielding materials with low density and thickness, high EMI shielding effectiveness (SE), and good mechanical strength and flexibility is highly demanded. − Compared with conventional metal shields that suffer from high density, unsatisfactory processability, and limited tuning of SE, , carbon nanomaterials, such as carbon nanotube (CNT) and graphene layers, normally present high mechanical strength, good electrical conductivity, low density, large aspect ratio, and good chemical stability, which demonstrate their significant potential for constructing EMI shields. − Particularly, the CNTs exhibit a mass production capability, showing the high potential for practical application. , Nevertheless, in order to prepare efficient EMI shields, the chemically inert CNTs inevitably require complex surface modification to avoid severe agglomeration. Moreover, the generally disordered winding or dispersion of CNTs introduces numerous structure defects and large contact resistance among the tubes, which are adverse to achieving high mechanical strength and conductivity of the CNT macrostructure. , Aligned carbon nanotube (A-CNT) films have improved conductivity and mechanical properties due to the highly ordered parallel-aligned and uniform distribution of CNTs. − For example, aligned CNT films have shown a good load-transfer capability under stress, leading to a high mechanical strength of 2.7–3.0 GPa in comparison to that of unaligned CNT films with a strength of 0.3 GPa .…”