Fabrication of Highly Conductive Silver-Coated Aluminum Microspheres Based on Poly(catechol/polyamine) Surface Modification

Abstract

A novel and cost-effective method for the fabrication of highly conductive Al/Ag core-shell structured microspheres was proposed and investigated. The oxidative co-deposition of catechol and polyamine was firstly performed to modify the surface of the aluminum microsphere. Then, a two-step electroless plating was conducted to fabricate the Al/Ag microspheres. During the first step of the electroless plating process, the surface of the aluminum microsphere was deposited with silver nanoparticle seeds using n-octylamine and ethylene glycol. Then, during the second step of the electroless plating process, silver particles grew evenly to form a compact silver shell on the surface of aluminum via a silver mirror reaction. According to the scanning electron microscope and energy dispersive X-ray results, a compact and continuous silver layer was successfully generated on the surface of the aluminum. The valence of the sliver on the surface of the aluminum was confirmed to be zero, based on the X-ray photoelectron spectrometer and X-ray diffractometer analyses. As a result, the as-prepared Al/Ag microspheres exhibited a high conductivity of 10,000 S/cm. The Al/Ag/MVQ composite demonstrated low electrical resistivity of 0.0039 Ω·cm and great electromagnetic interference shielding effectiveness at more than 70 dB against the X-band, and this result suggests that the as-prepared composite is a promising conductive and electromagnetic shielding material.

Superwetting Polypropylene Nonwoven Fabrics Modified by a Catechol-Based Biomimetic Strategy for Oil/Water Separation

“…In codeposition processes, silane coupling agents, including KH560, 29 KH570, 31 or A171, 31 were also used to promote the formation of hydrophilic coatings with cross-linked structures. The hydrophilic coating was used as a secondary reaction platform for chemical plating 32,33 and the grafting reaction. 32,34 Yang et al 35 further proposed the concept of "split-andadjust", splitting dopamine into CA and amino groups.…”

Improving the Thermal Conductivity of Natural Rubber Composites by Poly(catechol/polyamine) and Silane Surface Modification of Silicon Carbide

“…However, the high cost of PDA limits its industrial-sale production. Fortunately, the poly­(catechol/polyamine) (PCPA) with a similar structure to PDA can not only protect the surface characteristics of inorganic particles from damage but also serve as a ″molecular bridge″ for subsequent covalent modifications. , Moreover, the 3-thio-propylethoxy-bis­(trisyl-pentamethoxy)-silane (Si747) has attracted much attention recently due to the high chemical reactivity of the thiol groups and the silanol groups generated during hydrolysis. , …”

Preparation of silver‐coated thermally expandable microspheres and their application in antistatic polyacrylate foam materials

“…Traditionally, a common approach to preparing antistatic composite materials involves introducing antistatic agents 16 or conductive fillers 17–23 into a polymer matrix. It is widely recognized that metallic silver offers high conductivity, and chemical silver coating has the advantages of simplicity in operation, no restrictions on substrate materials, and uniform coating 24 . Du et al, 25 prepared a T‐ZnOw@Ag/PP composite by modifying silver nanoparticles on tetrapod‐like ZnO whiskers, which were surface modified by 3‐(trimethoxysilyl) propyl methacrylate to enhance compatibility with PP matrix.…”

“…It is widely recognized that metallic silver offers high conductivity, and chemical silver coating has the advantages of simplicity in operation, no restrictions on substrate materials, and uniform coating. 24 Du et al, 25 prepared a T-ZnOw@Ag/PP composite by modifying silver nanoparticles on tetrapod-like ZnO whiskers, which were surface modified by 3-(trimethoxysilyl) propyl methacrylate to enhance compatibility with PP matrix. The three-dimensional filler constructed more effective conductive pathways in the matrix, and the resistivity of PP was reduced by 7 orders of magnitude.…”