Optical control
Elect Nano develops low-reflectance optical coatings that combine nanocarbon absorption, engineered surface morphology, and application-ready coating chemistry for optical, aerospace, defense, and instrumentation environments.
Why low reflectance matters
Low-reflectance coatings suppress stray light, reduce glare, improve sensor contrast, manage internal reflections, and stabilize optical measurements. Performance depends on wavelength-specific absorption, scattering, film thickness, roughness, and air/coating/substrate interface reflection, not visual blackness alone.
Optical black surfaces should be evaluated by wavelength-dependent reflectance, with BRDF preferred when reflectance must be measured as a function of light incidence angle.
Total hemispherical reflectance also matters because stray-light-sensitive systems care about diffuse scatter.
Specular reflection is the mirror-like component that creates bright glints and reduces contrast inside optical assemblies.
Surface texture, binder selection, and application quality influence gloss.
Low reflectance comes from absorbing domains plus morphology that increases photon path length before light escapes.
Film thickness, roughness, and interface reflection all shift the measured response.
A practical optical black coating has to keep its surface structure, adhesion, cleanliness, and optical signature through use.
Durability is optical stability as well as mechanical attachment.
Interactive BRDF ray-tracing model
Adjust the goniometer angle, surface topography, and absorption probability under atmospheric white light to compare mirror-like return against diffuse scatter.
Pigment limits
Traditional black coatings often rely on micron-scale carbon black, graphite, inorganic pigments, organic pigments, or mixed pigment packages. They can make a surface visually black while still leaving measurable wavelength-dependent reflectance, glare, gloss, or nonuniform scatter.
Micron Pigment Coating
LEO durability
For optical hardware, durability is not only whether the coating stays attached. The surface must keep reflectance low, resist sloughing and dusting, avoid contaminating nearby optics, maintain adhesion after thermal cycling, avoid excessive outgassing, and keep a stable optical signature.
LEO exposure screening
In Elect Nano screening data, Quantum Dusk™ is shown maintaining low reflectance through a 5-year equivalent simulated low Earth orbit atomic oxygen exposure window. An anonymized competitive ceramic coating in the same comparison shows increasing reflectance and coating failure before the end of the exposure sequence.
Detailed AO dose, coupon construction, and test method should be reviewed before treating screening data as formal qualification evidence.
In low Earth orbit, atomic oxygen can impact exposed surfaces at orbital velocities and erode many hydrocarbon polymers and carbon-containing materials.
UV exposure, vacuum, contamination, and outgassing can change binder chemistry, surface cleanliness, and optical signature over time.
Repeated expansion mismatch can stress coating adhesion, create pinholes, or change surface roughness on real flight hardware.
Optical coatings must resist sloughing, dusting, and particle shedding so nearby optics and sensors stay clean.
Benchmark comparison
Vertically aligned CNT forests can produce extremely low reflectance through deep multi-bounce photon trapping, but the practical coating choice also depends on application process, substrate, handling, shedding risk, rework path, and qualification environment.
| Evaluation row | Traditional Pigment Coating | CVD CNT Forest | Elect Nano Nanocarbon Coating |
|---|---|---|---|
| Optical absorption | Moderate to high visual absorption, often with measurable scatter or gloss. | Benchmark ultra-black behavior from deep aligned CNT geometry. | Low-reflectance coating platforms with nanocarbon or refractory-nanoparticle absorption. |
| Application practicality | Sprayable or brushable with broad shop familiarity. | Vacuum/CVD process path with significant tooling constraints. | Water-based coating formats with HVLP spray, brush, oven cure, or ambient dry routes from current datasheets. |
| Coatable geometries | Good access to larger or complex parts when application controls are adequate. | Often limited by chamber size, line-of-sight, and process compatibility. | Designed for metals, plastics, ceramics, composites, coupons, baffles, housings, and optical structures. |
| Substrate compatibility | Binder-dependent and often easy to adapt. | Substrate temperature and catalyst compatibility can limit finished assemblies. | Substrate prep, thickness, adhesion, and cure path can be reviewed around the application. |
| Durability | Can trade optical loading against adhesion, flexibility, and processability. | Tall nanostructures can be fragile without additional protection. | Datasheets report 5H gouge hardness, 4B adhesion, and >200 C degradation temperature for current coating platforms. |
| Sloughing or shedding | Depends on binder wetting, pigment loading, cure, and handling. | Loose CNT material can create contamination risk in sensitive assemblies. | Quantum Dusk™ TDS positions the coating for sloughing resistance; application-specific cleanliness still needs qualification. |
| Space-environment suitability | Organic binders and pigments usually need specific space-environment qualification. | High optical performance, but practical survival depends on architecture and protection strategy. | Quantum Dusk™ is positioned for AO, UV, and thermal cycling resistance; Carbon Clad™ is not positioned as primary for AO-critical exposure. |
| Cost and scalability | Generally low cost and scalable. | High-cost processing and limited large-part scalability. | Coating route intended to bridge low reflectance with practical application and sample-review processes. |
| Rework or repair | Often reworkable by sanding, masking, and recoating. | Repair can be difficult without returning to specialized process equipment. | Coating application route creates a clearer path for trial coupons, masking, recoat studies, and process iteration. |
Performance data
The chart uses the measured 350-850 nm range from Elect Nano reflectance data. Competitive traces are excluded because comparable measured data was not included in the reviewed material.
UV-Vis reflectance
Carbon Clad™: 1.28-1.64% over 350-850 nm; Quantum Dusk™: 2.97-4.84% over 350-850 nm. Datasheet hemispherical reflectance values use a different measurement context than the UV-Vis traces.
Reflectance values and wavelength ranges are based on Elect Nano UV-Vis reflectance data. Competitive materials are anonymized.
Coating morphology
The SEM image shows the rough, porous coating surface at 20,000X magnification with a 200 nm scale bar. These nanoscale features help to scatter and trap light, thereby maximizing absorption across a wide range of angles and lighting conditions.
20,000X
SEM magnification
200 nm
visible scale bar
Rough surface
light-trapping texture
Surface architecture
Coating morphology
A textured coating surface creates the physical architecture behind low-glare optical behavior.
Optical pathway
Texture for light trapping
Rough surface features increase the number of internal loss paths before light escapes the coating.
Absorber network
Nanostructured carbon domains
Distributed nanocarbon-rich regions support broadband optical absorption without relying on coarse pigment loading alone.
Elect Nano platforms
Carbon Clad™ and Quantum Dusk™ share practical coating-process attributes but are positioned for different environmental requirements. The values below come from current datasheets and UV-Vis reflectance data.
Ultra-black dCNT coating
Water-based discrete carbon nanotube coating for low-reflectance optical control, sensor housings, baffles, scientific instruments, electronics hardware, terrestrial instruments, and aerospace hardware.
Best positioned for terrestrial, aerospace, high-orbit, or other non-AO-critical use cases unless additional qualification is supplied.
Hemispherical reflectance
2.3%
ASTM E1331, TDS V1.0
UV-Vis reflectance range
1.28-1.64%
350-850 nm
Solids content
12.6%
ASTM D2369, TDS V1.0
Recommended dry thickness
40 um
20-60 um range, TDS V1.0
Gouge hardness / adhesion
5H / 4B
ASTM D3363 / ASTM D3359
Space-oriented optical black coating
Predominantly water-based inorganic refractory nanoparticle coating with silicate binder for metals, plastics, and ceramics in optical and space environments.
Best positioned when AO erosion, UV exposure, thermal cycling, and contamination control are central design constraints.
Hemispherical reflectance
2.3%
ASTM E1331, TDS V1.0
UV-Vis reflectance range
2.97-4.84%
350-850 nm
Weight percent solids
8.0%
ASTM D2369, TDS V1.0
Recommended dry thickness
40 um
20-60 um range, TDS V1.0
Gouge hardness / adhesion
5H / 4B
ASTM D3363 / ASTM D3359
Application fit
These application areas are starting points for a technical review. Final selection should be based on substrate, masking, geometry, optical wavelength range, cleanliness, handling, environment, and qualification method.
stray light suppression
optical baffles and internal instrument surfaces
satellite optical components
star trackers, sensors, and imaging hardware
detector housings
laser and photonics hardware
aerospace and defense optical systems
calibration targets and low-reflectance surfaces
scientific instruments and machine vision fixtures
Material sample review
Share the wavelength range, substrate, geometry, use environment, and cleanliness constraints. Elect Nano can help define a coupon or coated-part evaluation path.