Near Room-Temperature Synthesis of Vertical Graphene Nanowalls on Dielectrics

Abstract

Vertical graphene nanowalls (VGNs) with excellent heat-transfer properties are promising to be applied in the thermal management of electronic devices. However, high growth temperature makes VGNs unable to be directly prepared on semiconductors and polymers, which limits the practical application of VGNs. In this work, the near room-temperature growth of VGNs was realized by utilizing the hot filament chemical vapor deposition method. Catalytic tantalum (Ta) filaments promote the decomposition of acetylene at ∼1600 °C. Density functional theory calculations proved that C2H* was the main active carbon cluster during VGN growth. The restricted diffusion of C2H* clusters induced the vertical growth of graphene nanoflakes on various substrates below 150 °C. The direct growth of VGNs successfully realized the excellent interfacial contact, and the thermal contact resistance could reach 3.39 × 10–9 m2·K·W–1. The temperature of electronic chips had a 6.7 °C reduction by utilizing directly prepared VGNs instead of thermal conductive tape as thermal-interface materials, indicating the great potential of VGNs to be directly prepared on electronic devices for thermal management.

Controllable Fabrication of Vertical Graphene with Tunable Growth Nature by Remote Plasma-Enhanced Chemical Vapor Deposition

“…Fast growth of pure VG can be achieved by optimizing the growth parameters such as temperature, dosage of mixed gas, and power of plasma generator. It is worth to note that other factors such as chamber pressure, the distance between the plasma source and the substrate are also important for the fabrication of VG because these parameters are closely related with the distribution of the plasma field. – These parameters are preoptimized for the experiments reported in this work.…”

Advancements in Plasma-Enhanced Chemical Vapor Deposition for Producing Vertical Graphene Nanowalls

“…This demonstrates the potential of VG arrays in heat dissipation technologies. Subsequently, Wang et al [ 37 ] revolutionized VG growth by realizing near room-temperature VGN growth using catalytic Ta filaments through HF-CVD. The ability to grow VGNs directly on substrates below 150 °C offers exceptional interfacial contact, reducing the electronic chip temperatures by 6.7 °C compared to conventional thermal conductive tape.…”

“…In regard to VGNWS applications, we have selected the most recent advances in the most interesting areas today, such as, photocatalysis [ 17 , 18 ], electrocatalyst for highly efficient hydrogen evolution reaction (HER) [ 19 , 20 , 21 ], rechargeable battery technology [ 22 , 23 , 24 ], supercapacitor technology [ 7 , 25 , 26 , 27 , 28 , 29 , 30 ], hydrovoltaic power generation [ 31 ], solar energy conversion [ 32 , 33 , 34 , 35 ], efficient thermal interfaces [ 36 , 37 , 38 , 39 ], field emission [ 40 ], IR detectors [ 41 ], and gas sensing [ 5 , 42 , 43 ].…”

High Refractive Index Carbonized Polymer Dots Acting as Light Scattering Units in Nanocomposites for Full‐Screen Light Guide Plate

“…Carbonized polymer dots (CPDs) is one type of 0D nanocarbon elementary materials that has gained significant attention in various fields, including catalysis, [ 8 ] sensing, [ 9 ] anticounterfeiting, [ 10 ] optoelectronic devices, [ 11 ] and biomedicine. [ 12 ] This is due to their diverse precursor materials, simple preparation process, abundant surface/edge sites, tunable photoluminescence, excellent and stable optical performance, and ease of chemical modification.…”