PhD researcher Ebtsam Alenezy holds a prototype of the light-activated hydrogen sensor, which can deliver ultra-precise results at room temperature
Inspired by the surface of butterfly wings, researchers have developed a light-activated hydrogen sensor that produces ultra-precise results at room temperature.
The technology can detect hydrogen leaks well before they pose safety risks and can measure tiny amounts of the gas on people’s breath, for diagnosing gut disorders.
Commercial hydrogen sensors only work at temperatures of 150C or higher, but the prototype developed by researchers at RMIT University is powered by light instead of heat.
The sensor, based on bumpy microstructures that imitate the surface of butterfly wings, is detailed in a new study published in the journal ACS Sensors.
Co-lead researcher Dr Ylias Sabri said the prototype was scalable, cost-effective and offered a total package of features that could not be matched by any hydrogen sensor currently on the market.
“Some sensors can measure tiny amounts, others can detect larger concentrations; they all need a lot of heat to work,” Sabri said.
“Our hydrogen sensor can do it all – it’s sensitive, selective, works at room temperature and can detect across a full range of levels.”
The sensor can detect hydrogen at concentrations from as little as 10 parts per million molecules (for medical diagnoses) to 40,000 parts per million (the level where the gas becomes potentially explosive).
Co-lead researcher Dr Ahmad Kandjani said the broad detection range made it ideal for both medical use and boosting safety in the emerging hydrogen economy.
“Hydrogen has potential to be the fuel of the future but we know safety fears could affect public confidence in this renewable energy source,” he said.
“By delivering precise and reliable sensing technology that can detect the tiniest of leaks, well before they become dangerous, we hope to contribute to advancing a hydrogen economy that can transform energy supplies around the world.”
Butterfly bumps: How the sensor works
The innovative core of the new sensor is made up of tiny spheres known as photonic or colloidal crystals.
These hollow shapes, similar to the miniscule bumps found on the surface of butterfly wings, are highly ordered structures that are ultra-efficient at absorbing light.
That efficiency means the new sensor can draw all the energy it needs to operate from a beam of light, rather than from heat.
PhD researcher and first author Ebtsam Alenezy said the room-temperature sensor was safer and cheaper to run, compared to commercial hydrogen sensors that typically operate at 150C to 400C.
“The photonic crystals enable our sensor to be activated by light and they also provide the structural consistency that’s critical for reliable gas sensing,” she said.
“Having a consistent structure, consistent fabrication quality and consistent results are vital – and that’s what nature has delivered for us through these bioinspired shapes.
“The well-developed fabrication process for photonic crystals also means our technology is easily scalable to industrial levels, as hundreds of sensors could be rapidly produced at once.”
To make the sensor, an electronic chip is first covered with a thin layer of photonic crystals and then with a titanium palladium composite.
When hydrogen interacts with the chip, the gas is converted into water. This process creates an electronic current and by measuring the magnitude of the current, the sensor can tell precisely how much hydrogen is present.
Unlike many commercial sensors that struggle in the presence of nitrogen oxide, the new technology is highly selective so it can accurately isolate hydrogen from other gases.
Medical applications
With elevated levels of hydrogen known to be connected to gastrointestinal disorders, the technology has strong potential for use in medical diagnosis and monitoring.
Currently, the standard diagnostic approach is through breath samples, which are sent to labs for processing.
Sabri said the new chip could be integrated into a hand-held device to deliver instant results.
“With gut conditions, the difference between healthy levels of hydrogen and unhealthy levels is miniscule – just 10 parts per million – but our sensor can accurately measure such tiny differences,” he said.
A provisional patent application has been filed for the technology and the research team hopes to collaborate with manufacturers of hydrogen sensors, fuel cells, batteries or medical diagnostic companies to commercialise the sensor.
The new study is the culmination of over two decades investigation into gas sensing by researchers in RMIT’s Centre for Advanced Materials and Industrial Chemistry (CAMIC), led by Distinguished Professor Suresh Bhargava.
Bhargava said Ebtsam Alenezy, an international PhD student who came to RMIT from Saudi Arabia’s Al Jouf University in 2017, had set a high benchmark with her research.
“As an innovator delivering industry-relevant and groundbreaking work, and as the mother of young children who has been juggling her outstanding research with her caring commitments during these challenging times, Ebtsam is an inspirational role model for aspiring scientists,” he said.
“She has been an important contributor to the cross-disciplinary CAMIC team that is jointly led by Dr Samuel Ippolito and Dr Ylias Sabri – a group that’s continuously producing amazing results, at the forefront of nanotechnology.”
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
Hydrogen sensor
- Brief Introduction to the Main Application Fields of Sensors
Sensors convert external signals into electrical signals and are used to monitor environmental parameters, detect the presence and position of objects, measure chemical composition and concentration, ...
- "Sentinel plants" could save crops via stress sensors in leaves
Specially tagged "sentinel plants" could soon provide an early warning of crop problems such as insect damage or bacterial infection. These plants would utilize two "glowing" sensors that react to ...
- Hydrogen Detection Market Size Rising to US$ 800 million by 2034
The hydrogen detection market is anticipated to experience significant growth in the upcoming years. The market recorded a valuation of US$ 240.3 million in 2023, and it is estimated to reach US$ ...
- Sensors that detect plant stress could revolutionize farming
The team is working on integrating the plant sensors into diagnostic systems that could not only detect stress but also initiate responses.
- MIT and Singapore Researchers Unveil Plant Sensors for Real-Time Stress Detection, Boosting Crop Protection
MIT and SMART have created sensors to detect real-time stress in plants by monitoring key signaling molecules.
Go deeper with Google Headlines on:
Hydrogen sensor
[google_news title=”” keyword=”hydrogen sensor” num_posts=”5″ blurb_length=”0″ show_thumb=”left”]
Go deeper with Bing News on:
Hydrogen sensor powered by light
- 6 Best Green Hydrogen Stocks and ETFs to Watch
Fuel cells essentially perform the reverse operation to convert hydrogen into electricity to power vehicles or the grid. "As electricity demand rapidly increases due to penetration of electric ...
- "Sentinel plants" could save crops via stress sensors in leaves
Specially tagged "sentinel plants" could soon provide an early warning of crop problems such as insect damage or bacterial infection. These plants would utilize two "glowing" sensors that react to ...
- Battery-powered big rigs could haul the future of trucking
Switching to electric or hydrogen-powered vehicles could make a huge impact ... officer at FirstElement Fuel. “In 2036 every light duty vehicle sold and every truck sold in California has ...
- Plant sensors could act as an early warning system for farmers
light, or attack from insects or bacteria. The sensors detect two signaling molecules that plants use to coordinate their response to stress: hydrogen peroxide and salicylic acid (a molecule ...
- Meet the boffins and buccaneers drilling for hydrogen
Governments are throwing subsidies at efforts to make hydrogen fuel. America’s Inflation Reduction Act offers lavish support for producing it cleanly from fossil fuels (which involves the clunky ...
Go deeper with Google Headlines on:
Hydrogen sensor powered by light
[google_news title=”” keyword=”hydrogen sensor powered by light” num_posts=”5″ blurb_length=”0″ show_thumb=”left”]