A next-generation carbon-based materials platform based on sp²–sp³ atomic-scale interface engineering
All-carbon composites are a strategic technology asset for ToSpike. By using nanodiamond surface graphitization as an active bonding medium, we achieve atomic-scale chemical bonding between diamond (sp³) and carbon matrices (sp²). This platform fundamentally addresses the interfacial thermal resistance bottleneck of conventional heterogeneous composites, delivering 500–1200+ W/m·K ultra-fast thermal conductivity while enabling extreme lightweighting and thermal stability. The technology will serve as the physical foundation for next-generation AI computing, optical modules, and new energy thermal management.
As semiconductor power density enters the kilowatt era, thermal management has become a hard constraint on compute and energy efficiency. Conventional materials face the following physical limits:
Traditional diamond/metal composites rely on mechanical embedding. Strong phonon scattering at heterogeneous interfaces limits phonon transport efficiency to only 40%–60%, so effective thermal conductivity falls far short of theoretical values.
Metal heat-spreader substrates and silicon/SiC chips have large differences in thermal expansion. Under rapid thermal cycling, interfacial stress readily causes delamination or die cracking.
Existing materials struggle to balance extreme thermal conductivity, low density (lightweighting), and electrochemical activity, limiting use in solid-state batteries and extreme environments.
ToSpike abandons conventional physical mixing and adopts a “carbon–carbon welding” chemical reconstruction paradigm:
Under precisely controlled heat treatment in vacuum/inert atmosphere, controlled phase transformation on sp³ diamond surfaces yields a tunable-thickness nanoscale sp² graphitized active shell. This layer preserves the ultra-high stiffness and thermal conductivity of the diamond core while providing open carbon orbitals for bonding.
During GPa-level high-pressure sintering or high-temperature densification, the graphitized shell undergoes atomic-scale rearrangement with carbon networks (graphene/CNT/carbon fiber). These C–C covalent bridges form phonon “highways” and eliminate interfacial barriers.
| Metric | Diamond–copper (Cu-based) | Diamond–SiC (SiC-based) | ToSpike all-carbon system |
|---|---|---|---|
| Interfacial bonding | Physical wetting (weak) | Reactive sintering (brittle) | Atomic covalent (strong & tough) |
| Phonon transport efficiency | 40%–60% | 60%–75% | > 90% (homogeneous coupling) |
| Thermal conductivity (TC) | 450–600 W/m·K | 500–700 W/m·K | 600–1200+ W/m·K |
| Density (g/cm³) | ~6 (very heavy) | ~3.2 (medium) | ~2.2–2.5 (very light) |
| CTE match (ppm/K) | 10–15 (mismatch) | 3–5 (good) | 1.5–4.0 (tunable) |
Control ~10 nm graphitization layers and reserve active sites for sp³–sp² conversion.
For rigid heat sinks or flexible pads, precisely blend sp² materials (graphene/fiber).
Rapid quench and ultra-high pressure lock metastable structures for maximum densification.
Including laser non-discrete cutting for stress relief and functional porosity for battery applications.
ToSpike has built a five-patent core matrix around this technology to secure competitive moats across verticals:
For optical modules and AI chips: addresses silicone bleed and interfacial failure with >100 W/m·K-class in-plane conduction.
Diamond’s ultra-high Young’s modulus physically suppresses Li dendrites for near-zero-expansion anodes and longer cycle life.
Carbon-based 3D electrodes from diamond by-product streams for refractory wastewater: ~10× lifetime, no hazardous waste.
GPa-level metastable structures lock internal stress for ambient superconductivity exploration and extreme piezoresistive sensing.