Led by the University of Surrey, a team of researchers from the Netherlands Forensic Institute (NL), the National Physical Laboratory (UK), King’s College London (UK) and Sheffield Hallam University (UK), used different types of an analytical chemistry technique known as mass spectrometry t ... more
Pretty as a peacock: The gemstone for the next generation of smart sensors
Method represents a simple, inexpensive and scalable approach to produce multi-functional graphene infused synthetic opals
Scientists have taken inspiration from the biomimicry of butterfly wings and peacock feathers to develop an innovative opal-like material that could be the cornerstone of next generation smart sensors.
An international team of scientists, led by the Universities of Surrey and Sussex, has developed colour-changing, flexible photonic crystals that could be used to develop sensors that warn when an earthquake might strike next.
The wearable, robust and low-cost sensors can respond sensitively to light, temperature, strain or other physical and chemical stimuli making them an extremely promising option for cost-effective smart visual sensing applications in a range of sectors including healthcare and food safety.
In a study published by the journal Advanced Functional Materials, researchers outline a method to produce photonic crystals containing a minuscule amount of graphene resulting in a wide range of desirable qualities with outputs directly observable by the naked eye.
Intensely green under natural light, the extremely versatile sensors change colour to blue when stretched or turn transparent after being heated.
Dr. Izabela Jurewicz, Lecturer in Soft Matter Physics at the University of Surrey's Faculty of Engineering and Physical Sciences, said "This work provides the first experimental demonstration of mechanically robust yet soft, free-standing and flexible, polymer-based opals containing solution-exfoliated pristine graphene. While these crystals are beautiful to look at, we're also very excited about the huge impact they could make to people's lives."
Alan Dalton, Professor Of Experimental Physics at the University of Sussex's School of Mathematical and Physical Sciences, said: ""Our research here has taken inspiration from the amazing biomimicry abilities in butterfly wings, peacock feathers and beetle shells where the colour comes from structure and not from pigments. Whereas nature has developed these materials over millions of years we are slowly catching up in a much shorter period."
Among their many potential applications are:
- Time-temperature indicators (TTI) for intelligent packaging - The sensors are able to give a visual indication if perishables, such as food or pharmaceuticals, have experienced undesirable time-temperature histories. The crystals are extremely sensitive to even a small rise in temperature between 20 and 100 degrees C.
- Finger print analysis - Their pressure-responsive shape-memory characteristics are attractive for biometric and anti-counterfeiting applications. Pressing the crystals with a bare finger can reveal fingerprints with high precision showing well-defined ridges from the skin.
- Bio-sensing - The photonic crystals can be used as tissue scaffolds for understanding human biology and disease. If functionalised with biomolecules could act as highly sensitive point-of-care testing devices for respiratory viruses offering inexpensive, reliable, user-friendly biosensing systems.
- Bio/health monitoring - The sensors mechanochromic response allows for their application as body sensors which could help improve technique in sports players.
- Healthcare safety - Scientists suggest the sensors could be used in a wrist band which changes colour to indicate to patients if their healthcare practitioner has washed their hands before entering an examination room.
The research draws on the Materials Physics Group's (University of Sussex) expertise in the liquid processing of two-dimensional nanomaterials, Soft Matter Group's (University of Surrey) experience in polymer colloids and combines it with expertise at the Advanced Technology Institute in optical modelling of complex materials. Both universities are working with the Sussex-based company Advanced Materials Development (AMD) Ltd to commercialise the technology.
Joseph Keddie, Professor of Soft Matter Physics at the University of Surrey, said: "Polymer particles are used to manufacture everyday objects such as inks and paints. In this research, we were able finely distribute graphene at distances comparable to the wavelengths of visible light and showed how adding tiny amounts of the two-dimensional wonder-material leads to emerging new capabilities."
John Lee, CEO of Advanced Materials Development (AMD) Ltd, said: "Given the versatility of these crystals, this method represents a simple, inexpensive and scalable approach to produce multi-functional graphene infused synthetic opals and opens up exciting applications for novel nanomaterial-based photonics. We are very excited to be able to bring it to market in near future."
- material developments
- smart sensors
- photonic crystals
In collaboration with the Argonne National Laboratory, Dr. Marcus Newton of the Advanced Technology Institute at the University of Surrey and Professor Ian Robinson of the London Centre for Nanotechnology have for the first time mapped strain in three-dimensions in a single nanoscale object ... more
Researchers at the University of Surrey have shown for the first time that knowing the structure of the surface layer of a multi-layer carbon nanotube is not enough to predict its electronic properties. The contribution of inner layers is crucial, and this has serious implications when it p ... more
- 1A new, highly sensitive chemical sensor uses protein nanowires
- 2New COVID-19 test quickly and accurately detects viral RNA
- 3Researcher Develops One Minute Coronavirus Test
- 4Diagnostic biosensor quickly detects SARS-CoV-2 from nasopharyngeal swabs
- 5The Higgs boson and superconductivity
- 6A new biosensor for the COVID-19 virus
- 7A Glimpse into Real-Time Methanol Synthesis
- 8Single-cell RNA seq method developed to accurately quantify cell-specific drug effects in pancreatic islets
- 9Start-up Raises 16.3 million Euros to Prepare Market Launch of its SARS-CoV-2 Rapid Testing System
- 10Sartorius closes acquisition of selected assets of Danaher Life Sciences
- Pretty as a peacock: The gemstone for the next generation of smart sensors
- Print your own laboratory-grade microscope for US$18
- Mologic awarded c.£1 million by UK government to develop rapid diagnostic test for COVID-19
- 'Tickling' an atom to investigate the behavior of materials
- Applied Photophysics board appoints Tim Flanagan as CEO