The uniform modification of Ag nanoparticles on the lightweight and strong carbon nanotube sponge (CNTS) three-dimensional conductive support. The flexible Ag/CNTS/PDMS composite material has extremely high electromagnetic shielding performance and adjustable electromagnetic shielding performance, and has high mechanical strength and conductivity. Under the low load of Ag (3%, wt%) and CNTS (4%, wt%), the large EMI-SE of X-band (8-12 GHz) is even greater than 90 dB. In addition, the three-dimensional interconnected pore structure allows electromagnetic waves to be reflected multiple times in the Ag/CNTS hybrid material, which has a strong absorption capacity. By adjusting the Ag deposition parameters and sample thickness, the electromagnetic shielding performance of the sample can be controlled more conveniently. This method successfully avoids the dispersion problem of fillers and is of great significance to the development of high-performance electromagnetic shielding materials.
figure 1. (A) Manufacturing schematic diagram of Ag/SDS-CNTS/Polydimethylsiloxane (PDMS) and Ag/Polydopamine (PDA)-CNTS/PDMS composite materials; (b) Flexible CNTS bends nearly 180 degrees and recovers elastically (C) Carpet-like CNTS with macrostructure.
figure 2. (A) SEM surface image of CNTS prepared; (b) SEM surface image of polydopamine-coated CNTS (PDA-CNTS); (c), (d) (c) low magnification and (d) high magnification plating SEM surface image of PDA-CNTS after silver.
Figure 3. (a) SEM top image of Ag/SDS modified CNTS hybrid reduced by NaBH 4.
(B) SEM cross-sectional image of the CNTS hybrid modified with Ag/SDS reduced by NaBH 4.
(C) SEM top image of Ag/SDS-CNTS after silver plating.
(D) SEM cross-sectional view of Ag/SDS-CNTS after additional silver plating.
(E) Comparison XPS pattern of Ag/CNTS surface and cross section
(F) Comparative XRD patterns of the surface and cross-section of Ag/CNTS and CNTS samples.
Figure 4. (A) Schematic diagram of reflection, transmission and multiple reflection of electromagnetic waves in Ag/CNTS.
(B) The conductivity of Ag/CNTS for different silver plating time.
(C) EMI SE with different thickness of CNTS and Ag/SDS-CNTS/PDMS.
(D) EMI with different thicknesses of Ag/PDA-CNTS/PDMS.
(E) Ag/CNTS/PDMS (modified by SDS and PDA) and CNTS specific EMI SE with a thickness of 0.5 mm in the X-band.
(F) Thickness dependence of absorption SE (SE A), reflection SE (SE R) and total EMI SE (SE total) (Ag/CNTS/PDMS hybrid).
(G)-(h) Time dependence of Ag/SDS-CNTS EMI SE with different silver plating time.
(I) Tensile stress-strain curve of Ag/CNTS/PDMS hybrid.
The CVD method is used to prepare three-dimensional carbon nanotubes with good mechanical properties and electrical conductivity. The hydrophobic carbon nanotubes were pre-modified with SDS and polydopamine. After silver plating, fine and uniform silver nanoparticles are uniformly distributed on the sidewall of PDA-CNTS, and dense and large silver nanoparticles are formed on the SDS-CNTS sample. The electromagnetic interference intensity of the material can also be adjusted by adjusting the material thickness and silver plating time. Compared with pure PDMS materials, the tensile strain of Ag/CNTS/PDMS composite materials is increased by 80%, and the tensile strength is increased by about 300%.
We have four categories of zero-dimensional/one-dimensional/two-dimensional/three-dimensional to provide dozens of product categories and thousands of nanomaterials. The materials include metal nanomaterials and non-metallic nanomaterials, as well as their oxides or carbides. Compound customization, etc., the particle size can be selected from 5 nanometers to 2000 nanometers.
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zzj 2021.3.18