Facile Synthesis of Sn/Reduced Graphene Oxide Composites With Tunable Dielectric Performance Toward Enhanced Microwave Absorption

Abstract

Electromagnetic (EM) wave absorbing materials are strongly desired for the reason that EM pollution has become a serious problem with the rapid development of modern technology, which brings harm to the environment and human health. Herein, nanocomposites of Sn/reduced graphene oxide (Sn/rGO) as a novel type of EM absorbing materials were synthesized via a facile and efficient strategy. Nanoscale SnO 2 microspheres were synthesized by sol-gel method, and the Sn/rGO composites were obtained after hydrothermal process with GO. Samples with different Sn content were fabricated (rGO:Sn = 30:1, 20:1, 10:1, mass ratio), and their EM wave absorption performance were analyzed. By changing the mass ratio of Sn and rGO, dielectric constant of the composites can be adjusted, and better impedance matching can be achieved. The unique capacitive structure and conductive network enable the material to have strong dielectric loss and excellent absorption performance. This research offers a new route for designing and fabricating high-frequency EM wave absorbing materials.

γ-Ray-Assisted Synthesis of a Pt–Sn Bimetallic Composite Loaded on Graphene–Graphitic Carbon Nitride Hybrid: A Cocktail Electrocatalyst for the Methanol Oxidation Reaction

“…Such an interaction of the Sn with r-GO has been well-studied for its possible applications in the lithium-ion battery . Also, the favorable Sn with GCN interaction via Sn–N bonding may influence the overall higher activity of Pt–Sn/rGO-GCN combination. , On the contrary, in the case of Pt/GO-GCN, the current density is degraded from 1514 to 1350 mA/mg Pt at the 100th cycle. Here, the degradation again attributed to the poisoning of the Pt surface due to the scarcity of the −OH group.…”

Construction of a Cu–Sn Heterojunction Interface Derived from a Schottky Junction in Cu@Sn/rGO Composites as a Highly Efficient Dielectric Microwave Absorber

“…First, a chemical plating bath was prepared, which was described in the previous article. 39 Second, the prepared SnO 2 (according to our previous work 40 ) was added into the above chemical plating solution and stirred continuously for 0.5, 1, and 2 h, respectively. Then, the mixture was filtered, washed, and dried.…”

“…Fabrication of Cu@Sn/rGO Composites. A GO dispersed solution, the prepared nanoscale Cu@SnO 2 microspheres, and 1 mL of KH-550 were mixed in 50 mL of deionized water for 2 h (mass ratio of GO/Cu@SnO 2 = 20:1, which has the best impedance matching in the composites according to our previous work 40 ). Then, it was treated by the hydrothermal method at 180 °C for 12 h. After freeze drying, the powder was sintered at 800 °C for 2 h (Ar atmosphere).…”