Fundraising FoxAltered Carbon
Bristol, GB · 1 known investors
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Altered Carbon builds a chemical-sensing platform based on proprietary graphene nanomaterials that lets machines detect and interpret airborne chemical signals at ultra-low power. The technology serves applications across the built environment, healthcare, food and agriculture, security and defence, industrial infrastructure, and robotics/autonomous systems.
Founders & leadership
SO
Sam OnwugbenuCPO & FounderSam Onwugbenu has a background in robotics engineering and applied AI. As CPO and founder of Altered Carbon, he leads product development and strategy for the company's chemical-sensing platform based on graphene nanomaterials.
FB
Frazer BarnesCTO & FounderFrazer Barnes is co-founder and CTO of Altered Carbon, where he leads scientific and engineering efforts in developing ultra-low-power chemical sensors based on graphene and other nanomaterials. He works across materials science, electrochemistry, electronics, and embedded systems to create edge-deployable sensors for gas-sensing applications in autonomous systems, robotics, and infrastructure monitoring.
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George HawkinsCEOGeorge Hawkins is CEO of Altered Carbon, which develops graphene-based chemical sensing platforms for applications in buildings, infrastructure, healthcare, and industrial environments. He has held technology leadership and applied research roles and leads teams across materials science, electrochemistry, and embedded systems.
Board
Investors · 1
Companies House · registry record
View on Companies House ↗Confirmation statement overdue
- Registered name
- ALTERED CARBON LIMITED
- Company number
- 11362774
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 May 2018
- Registered office
- Henleaze Business Centre, Harbury Road, Bristol, Avon, BS9 4PN
- Nature of business (SIC)
- 71122 — Engineering related scientific and technical consulting activities71129 — Other engineering activities
- Accounts
- last made up to 31 Dec 2025 · next due 30 Sept 2027
- Confirmation statement
- last made up to 30 Mar 2025 · next due 13 Apr 2026
Current officers · 6
- Frazer John Stephen Barnes — director, appointed 1 Jan 2021
- Dominic John Keen — director, appointed 31 Jul 2022
- Sam Onwugbenu — director, appointed 28 Sept 2018
- Ali Rohafza — director, appointed 28 Sept 2018
- Dobromir Petkov Todorov — director, appointed 30 Sept 2025
- Amygdala Ltd — corporate director, appointed 30 Sept 2025
Source: Companies House public register · retrieved 16 Aug 2026. Contains public sector information licensed under the Open Government Licence v3.0.
Frequently asked questions
- What does Altered Carbon do?
- Altered Carbon builds a chemical-sensing platform based on proprietary graphene nanomaterials that lets machines detect and interpret airborne chemical signals at ultra-low power. The technology serves applications across the built environment, healthcare, food and agriculture, security and defence, industrial infrastructure, and robotics/autonomous systems.
- Who founded Altered Carbon?
- Altered Carbon was founded by Sam Onwugbenu, Frazer Barnes.
- Who are Altered Carbon's investors?
- Altered Carbon's investors include Oxford Investment Opportunity Network (OION).
- Where is Altered Carbon headquartered?
- Altered Carbon is headquartered in Bristol, GB.