Graphene Encapsulated Al Particles for Improvement of Thermal Conductivity in Composites

Abstract

Graphene reinforced aluminum matrix composites (GRAMCs) with improved thermal conductivity were prepared via a pH-controlled self-assembly process that involved adjusting the concentration of dispersed graphene oxide (GO) solutions. Uniform dispersion was achieved using GO coating on the aluminum (Al) surfaces. Graphene encapsulated Al powders (Al/GO) were sintered through spark plasma sintering (SPS) to prepare bulk composites, these were then analyzed to determine the thermal and mechanical properties. The density of the Al/GO composites was determined to be 99% or more compared to the theoretical density of pure Al. The Vicker’s hardness and thermal conductivity increased by about 47% and 15% more than the pristine Al bulks. These processes can improve properties of the thermal interface between GO and Al, enabling uniform coating without a crosslinking agent. An Al/GO composite, fabricated through the pH-controlled self-assembly process, should be useful for various applications requiring to high thermal conductivity.

SiC Nanowires Bridged Graphene Aerogels with a Vertically Aligned Structure for Highly Thermal Conductive Epoxy Resin Composites and Their Mechanism

“…The XPS survey spectra of HGA-5 are exhibited in Figure d, and the four main peaks belong to Si2p, Si2s, C1s, and O1s, respectively. Figure e is the deconvolution of the C1s peaks, and it shows peaks at 283.09, 284.10, 284.87, 285.74, 286.49, and 290.02 eV, corresponding to C–Si, sp 2 bonding, sp 3 bonding, C–O, CO, and plasmon loss features. − Figure f is the deconvolution of the Si2p peaks, and the peak at 100.99 eV corresponds to Si–C, which was in agreement with the deconvolution of the C1s peaks. The peak at 103.06 eV corresponding to Si–O indicates that a small amount of the silicon powder was oxidized by the trace oxygen in the Ar atmosphere.…”

Photochemical Optimization of a Silver Nanoprism/Graphene Oxide Nanocomposite’s Antibacterial Properties

“…The C 1s spectrum (Figure b) exhibits five main components related to the graphene oxide and silver oxide composition as detailed in Table . The most prominent components correspond to the surface structure of graphene oxide sp 2 and sp 3 sites at 284.6 and 285.2 eV, respectively. ,, The well-known GO structure is characterized by the presence of oxygen sites forming C–O and CO bonds as it is evinced here at 286.1 and 287.6 eV. , In addition to these binding environments, we also have the presence of a unique peak at 288.6 eV attributed to carboxylates COO– that bind to the surface Ag atoms accepting electron charge density from the metal. This brings the first evidence about the improved formation of S-NPs on GO as explained in the schematic Figure .…”

“…The most prominent components correspond to the surface structure of graphene oxide sp 2 and sp 3 sites at 284.6 and 285.2 eV, respectively. 33 , 42 , 43 The well-known GO structure is characterized by the presence of oxygen sites forming C–O and C=O bonds as it is evinced here at 286.1 and 287.6 eV. 33 , 43 In addition to these binding environments, we also have the presence of a unique peak at 288.6 eV attributed to carboxylates COO– that bind to the surface Ag atoms accepting electron charge density from the metal.…”

“… 33 , 42 , 43 The well-known GO structure is characterized by the presence of oxygen sites forming C–O and C=O bonds as it is evinced here at 286.1 and 287.6 eV. 33 , 43 In addition to these binding environments, we also have the presence of a unique peak at 288.6 eV attributed to carboxylates COO– that bind to the surface Ag atoms accepting electron charge density from the metal. This brings the first evidence about the improved formation of S-NPs on GO as explained in the schematic Figure 1 .…”

Electrochemical Deposition of Reduced Graphene Oxide Decorated with Silver and Nickel Oxide Nanoparticles for Quantification of Ascorbic Acid in Bottled Fruit Juice and Vitamin C Tablet

“…Figure 6a depicts the XPS narrow scan of Ag 3d and peaks at 374.18, 372.67, 371.97, 368.19, 366.67, and 365.94 eV are due to Ag + and Ag 0 states, respectively indicating that the presence of both Ag + and Ag 0 states in the NiAg/rGO electrocatalyst/nano-sensor. 34 35 Figure 6c shows nickel which exhibits 2P 3/2 that consists of the main peak at ∼853 eV, shoulder peak at ∼855 eV, and shake up satellite peak at ∼861 eV. Similarly, 2P 1/2 displays two peaks at ∼872 eV and ∼879 eV, corresponding to the main peak and the satellite peak respectively.…”