After the Graphene Hype: Why New Materials Run Hot Before They Mature

While writing the diamond thermal-management industry report, I kept seeing a familiar kind of announcement: another local diamond project had landed, or another company had reached a new heat-spreader size.

After enough of these, I began to ask whether the sector was becoming overheated. That question brought me back to graphene.

Graphene had almost every attribute expected of a star material: strength, electrical and thermal conductivity, extreme thinness and flexibility. It could be assigned a role in transistors, displays, batteries, composites, coatings, sensors and biomedicine. Many of today’s diamond narratives have a similar breadth.

Yet revisiting graphene’s last two decades makes one point clear: describing the story only as a bubble that burst captures only half of it.

From laboratory star to capacity boom

Andre Geim and Konstantin Novoselov isolated single-layer graphene by mechanical exfoliation in 2004 and received the 2010 Nobel Prize in Physics for their graphene experiments.

Graphene then moved rapidly from physics into industrial policy and investment. China became especially active. Public figures cited by academician Zhongfan Liu indicate that China accounts for more than 70% of graphene-related patents and a similarly high share of papers. Earlier research-intelligence work had already placed China among the global leaders in publications and patents by 2016.

Government and capital followed. The UK earmarked £50 million for a graphene commercialization hub in 2011. The EU later launched the ten-year, €1 billion Graphene Flagship. China developed numerous graphene parks, industrial bases and production projects.

Capacity was real, not merely rhetorical. Public figures cited by Liu put China’s 2022 graphene-powder capacity at approximately 22,000–25,000 tonnes with utilization of about 7%. Film capacity was reported at roughly 5.4 million square metres with utilization near 0.23%.

The contrast is striking: globally prominent papers, patents and capacity on one side, and extremely low utilization on the other.

The gap is the long journey from a laboratory sample to a scalable product and then to a commodity that customers repeatedly accept.

The question is not whether it can be used, but why it must be used

Graphene can be used in flexible displays, batteries, thermal products, coatings and sensors. Many such statements are technically defensible.

But “can be used” and “must be used” are entirely different propositions.

A new material does not create a large market because a presentation lists many applications. It succeeds when it is clearly better than an incumbent in a real use case, and when that advantage is large enough to offset cost, processing, qualification and supply-chain switching.

Single-material performance is not system performance. Once graphene enters a product, it faces scale-up, layer-count consistency, dispersion, transfer, contact resistance, matrix compatibility, standards and cost. Its competitors are not theoretical limits in another paper; they are mature copper, aluminium, graphite, carbon black, ITO and silicon solutions.

Diamond thermal management faces the same test. High conductivity matters, but it does not automatically become an order. Customers buy a device, a package and a reliable system, not a number on a material datasheet.

The downturn did not erase everything

Low utilization makes the graphene boom easy to describe as overbuilding. That is still only half the picture.

A 2015 review estimated actual global graphene output at no more than roughly 120 tonnes. By 2019, a Nature Nanotechnology review said annual graphene-flake production capability had reached thousands of tonnes.

Capacity did not mean demand had caught up. It did show that scale-manufacturing capability had been built.

The Graphene Flagship also left more than factories. The European programme assembled a large academic-industrial ecosystem, trained researchers, supported spin-outs, attracted financing and moved multiple products toward market. Those outcomes fell short of the early idea that graphene would change everything, but they were not nothing.

The more durable legacy includes better production equipment, deeper engineering experience, clearer material classification, improved test methods, a larger skilled workforce and lower experimentation costs for downstream companies.

This makes the history more nuanced: many optimistic forecasts failed, but the investment cycle helped turn an expensive, scarce laboratory material into an industrial family that can be produced at scale.

One caveat is essential. Nominal capacity is not effective supply capability. Products sold as “graphene” vary greatly in layer count, lateral size, defects and purity. A large capacity figure does not become industrial infrastructure if quality is irreproducible and specifications cannot be compared.

That warning matters directly to diamond.

A useful, limited reading of Carlota Perez

To think about whether diamond is overheating, I revisited Carlota Perez’s Technological Revolutions and Financial Capital.

Perez examines system-wide revolutions such as railways, electrification, automobiles and information technology. Graphene is one material and cannot simply be mapped onto her full framework. But one mechanism is useful.

After a technological breakthrough, people see future potential first. Finance invests early, companies expand early and local governments build early. Investment often moves faster than real demand matures. When the gap between expectations and reality becomes visible, projects fail, firms exit and the industry adjusts.

That investment wave does more than raise valuations. It can build equipment, production lines and supply chains while training engineers, accumulating process knowledge and lowering manufacturing barriers. Capital may overestimate when profits will arrive while still creating foundations for industrialization a decade later.

The qualification matters: not all overinvestment is useful. Duplicative low-level facilities, customerless lines and projects created mainly to obtain policy resources may end as sunk cost. What matters is whether spending becomes reusable capability.

The decisive question is therefore:

After the boom, are we left with empty plants, or with lower manufacturing costs, more stable processes, clearer standards, stronger supply chains and real customers?

Those are two very different forms of overheating.

Looking again at diamond thermal management

The parallels are visible. Diamond combines high thermal conductivity, electrical insulation, a wide bandgap and high breakdown field. Its expanding application list includes diamond-metal composites, heat spreaders, laser heat sinks, GaN-on-diamond, microchannels, advanced packaging and three-dimensional integration.

It is tempting to move directly from strong properties to a large market.

In the diamond thermal-management report, however, I traced six layers of evidence: papers, patents, corporate positioning, projects and capacity, customer validation, and financial realization. They do not show a market expanding uniformly.

Evidence is densest near research and supply. Public evidence becomes thinner as the analysis approaches customer orders and revenue. That front-loaded pattern resembles graphene’s earlier industrialization phase.

Diamond is not a simple replay of graphene.

First, diamond is not a wholly new material industry. HPHT diamond already has a mature base, while CVD diamond has accumulated experience in tools, optics and windows. Thermal management is partly a migration of established capabilities into new markets.

Second, some demand is not invented by material suppliers. High-power GaN devices, micro-hotspots, near-junction cooling and advanced-packaging bottlenecks are real problems that require solutions with or without diamond.

Third, the constraints extend beyond cost. Thermal boundary resistance, metallization and bonding, batch consistency, device-process compatibility, reliability and customer qualification can each determine adoption.

More MPCVD systems and cheaper plates therefore do not guarantee that the market will automatically accelerate.

Watch what survives, not merely how hot the market looks

“Is this industry overheated?” is not the most useful question. Better questions are:

• Has material performance become system performance?
• Why must the customer use this material?
• Is the strongest evidence in papers, patents and capacity, or in customer spending?
• Which reusable capabilities is the current investment cycle building?
• What will remain when attention fades?

For diamond thermal management, the last question is especially important. Even if some projects and expectations fail, the current cycle could leave better MPCVD equipment, larger and more consistent diamond material, stronger metallization and bonding, more standardized thermal testing, and semiconductor and packaging customers that understand diamond better.

Those would be meaningful industrial assets.

If all that remains is nominal capacity, underused equipment and unqualified samples, scale would simply reproduce the least useful part of the graphene boom.

I therefore do not take a growing project count as proof that a mass market has arrived. Nor do I treat signs of overheating as proof that the investment cycle has no value.

The real task is to distinguish expectations from emerging capability, repetitive construction from infrastructure for the next stage, and technical attention from customer and financial evidence.

An advanced-material industry is not ultimately judged by how many people believed in it at peak excitement. It is judged by what remains after the excitement passes.

Sources and scope note

The 2022 Chinese graphene-powder capacity appears in public materials as both approximately 22,000 and 25,000 tonnes, so this article uses a range. Reported utilization of roughly 7%, and film capacity of about 5.4 million square metres with utilization near 0.23%, are relatively consistent across the cited public discussions, but their definitions are not equivalent to an audited industry census. Market-size estimates vary materially by product scope and are not used as a core argument here.