A review on heterogeneous photocatalysis for environmental remediation: From semiconductors to modification strategies

With the innovation of microelectronics technology, the heat dissipation problem inside the device will face a severe test. In this work, cellulose aerogel (CA) with highly enhanced thermal conductivity (TC) in vertical planes was successfully obtained by constructing a vertically aligned silicon carbide nanowires (SiC NWs)/boron nitride (BN) network via the ice template-assisted strategy. The unique network structure of SiC NWs connected to BN ensures that the TC of the composite in the vertical direction reaches 2.21 W m-1 K-1 at a low hybrid filler loading of 16.69 wt%, which was increased by 890% compared to pure epoxy (EP). In addition, relying on unique porous network structure of CA, EP-based composite also showed higher TC than other comparative samples in the horizontal direction. Meanwhile, the composite exhibits good electrically insulating with a volume electrical resistivity about 2.35 × 1011 Ω cm and displays excellent electromagnetic wave absorption performance with a minimum reflection loss of - 21.5 dB and a wide effective absorption bandwidth (< - 10 dB) from 8.8 to 11.6 GHz. Therefore, this work provides a new strategy for manufacturing polymer-based composites with excellent multifunctional performances in microelectronic packaging applications. 

https://link.springer.com/content/pdf/10.1007/s40820-022-00863-z.pdf

Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose Aerogel Networks Enhanced Thermal Conductivity and Electromagnetic Absorbing of Epoxy Composites

Electromagnetic absorption materials: current progress and new frontiers

Environment Tolerant Conductive Nanocomposite Organohydrogels as Flexible Strain Sensors and Power Sources for Sustainable Electronics

/pdf/vertically-aligned-silicon-carbide-nanowires-boron-nitride-3c47jkzj.pdf

Recent Progress in Essential Functions of Soft Electronic Skin

Core-shell structured polyaniline (PANI) nanocomposites with tunable magnetoresistance (MR) were obtained through the facial surface-initiated polymerization method with assistance of zero-, one-, and two-dimensional nanocarbons (carbon black, carbon fiber, carbon tube, and graphene). The improved dielectric properties and typical semiconducting behavior were observed in the PANI nanocomposites. And the quasi 3D electron conduction mechanism was observed in all the samples through Mott variable range hopping model, indicating that dimension of the nanocarbons does not affect the charge transport mechanism. Meanwhile, positive MR was observed in all the samples, and the MR value can be controlled by nanocarbons. When nanocarbon loading is 10.0 wt%, MR of graphene/PANI, carbon fiber/PANI, carbon black/PANI, and carbon tube/PANI were 15.6%, 14.7%, 9.5%, and 1.5%, respectively. The positive MR phenomenon was analyzed by the wave functional shrinkage model. The magnetic field and nanocarbons’ effects on the localization length, density of state at the Fermi level, average hopping length, and hopping energy were systematically studied. This work provides the guideline for the fabrication of tunable magnetic sensor or information storage device. Tunable magnetoresistance was reported in the polyaniline nanocomposites with zero-, one-, and two-dimensional nanocarbons as fillers.

Tunable magnetoresistance of core-shell structured polyaniline nanocomposites with 0-, 1-, and 2-dimensional nanocarbons

Biodegradable poly(lactic acid) nanocomposites reinforced and toughened by carbon nanotubes/clay hybrids

Considering the complex actual environments and fields, the effective integration of multiple functions into one material is greatly and urgently required but still faces enormous challenges. Herein, an aerogel-based electromagnetic wave (EMW) absorber with the functions of piezoresistive sensing, infrared stealth, thermal insulation, and Joule heating was developed. Biomass bacterial cellulose (BC) and GO work as the carbon resource and reinforcing filler, respectively, obtaining a resilient (80% compression strain) and lightweight (7.81 mg cm−3) BC-derived C/thermal reduced GO (rGO) aerogel with the unidirectional cellular structure via the unidirectional freeze-drying and pyrolysis techniques. Remarkably, the prepared aerogel displayed the typical rGO loading and compression strain-dependent EMW absorption performance, and a significant improvement in the EMW absorption capacity with a minimum reflection loss (RLmin) of −46.11 dB and maximum effective absorption bandwidth (EABmax) of 9.12 GHz at the thickness of 2.70 mm was achieved for C/rGO-10 (10 wt% rGO loading) when a 70% compression strain was applied compared to that in the natural state. Moreover, the aerogel also presented other attractive features, including stable, durable, and fast responsive piezoresistive sensing performances, effective thermal infrared stealth, and thermal insulating properties, and exceptional adjustable Joule heating performance. This study paves the way for developing high-performance EMW absorption materials with multiple functions to meet various applications.

Gang Song

Papers

Recent Progress in Essential Functions of Soft Electronic Skin

Tunable magnetoresistance of core-shell structured polyaniline nanocomposites with 0-, 1-, and 2-dimensional nanocarbons

Biodegradable poly(lactic acid) nanocomposites reinforced and toughened by carbon nanotubes/clay hybrids

A resilient and lightweight bacterial cellulose-derived C/rGO aerogel-based electromagnetic wave absorber integrated with multiple functions

Metal organic framework-derived C-doped ZnO/TiO2 nanocomposite catalysts for enhanced photodegradation of Rhodamine B.