Submerged Sensors to Control Wearable Electronics
August 18, 2021 | ACN NewswireEstimated reading time: 1 minute

Flexible and waterproof sensors that could unlock new applications for wearable electronics have been developed by scientists in Korea. Published in the journal Science and Technology of Advanced Materials, the study shows how the pressure sensor can control a phone, to take photos and play music, even when the sensor is fully immersed in water.
The technology could transform the use of wearable electronics in healthcare, smart textiles and for specific applications including scuba diving equipment, say the study researchers, who are based at Soongsil University in Seoul.
"Flexible electronics will usher in a whole new world of wearable technologies to monitor our health and lifestyles," says Jooyong Kim, a materials scientist who led the research. "But until now, many of these applications have been held back because the pressure sensors they rely on could not handle being exposed to water. We have changed that."
To demonstrate the power of the new technology, the researchers incorporated one of the sensors into a flexible face mask. Sensitive enough to detect the movement of air inside the mask, the sensor could track and report the rate of breathing of a wearer in real-time.
The sensor converts tiny movements caused by change in pressure and electrical resistance into electronic signals. Like many similar flexible electronic devices, the design of the circuit was hand-drawn onto a conducting material with a marker-pen, which acts to shield the circuitry when the rest of the material was etched away. This is cheaper than traditional methods.
The researchers then mounted the finger-print sized circuit onto a blend of wet tissue paper and carbon nanotubes, which works to detect changes in pressure. They then covered the layered sensor device with a strip of tape, to make it waterproof.
The device can track both the magnitude and location of pressure applied to it. Using machine learning technology to process the signals, the researchers found the sensors could feel and report applied pressures in the lab with up to 94% accuracy. And by connecting the sensor to a wi-fi network, the researchers could press it underwater to control phone functions, including double touch, triple touch, short touch, and long touch patterns.
"We expect the readily-available materials, easy fabrication techniques, and machine learning algorithms we have demonstrated in this journal article will bring significant contributions to the development of hand-drawn sensors in the future," says Kim.
Testimonial
"In a year when every marketing dollar mattered, I chose to keep I-Connect007 in our 2025 plan. Their commitment to high-quality, insightful content aligns with Koh Young’s values and helps readers navigate a changing industry. "
Brent Fischthal - Koh YoungSuggested Items
Fresh PCB Concepts: Designing for Success at the Rigid-flex Transition Area
08/28/2025 | Team NCAB -- Column: Fresh PCB ConceptsRigid-flex PCBs come in all shapes and sizes. Manufacturers typically use fire-retardant, grade 4 (FR-4) materials in the rigid section and flexible polyimide materials in the flex region. Because of the small size, some rigid-flex PCBs, like those for hearing aid devices, are among the most challenging to manufacture. However, regardless of its size, we should not neglect the transition area between the rigid and flexible material.
Global Flexible PCB Output Expected to Surpass $20 Billion by 2025, with AI Glasses Emerging as a New Growth Driver
08/25/2025 | TPCAThe Taiwan Printed Circuit Association (TPCA) and the Industrial Technology Research Institute (ITRI) released the "2025 Global Flexible PCB Industry Outlook" in August.
Nano Silver Inks Market Forecast Report 2025-2030
08/20/2025 | Globe NewswireThe Nano Silver Inks Market is expected to grow from USD 427.415 million in 2025 to USD 836.160 million in 2030, at a CAGR of 14.36%.
Flexible Circuit Technologies to Host Free Flex Heater Webinar
08/18/2025 | Flexible Circuit TechnologiesGlobal Supplier of flexible circuits, flex design services, and assembly/box-build services, Flexible Circuit Technology will host their latest webinar, "Thermal Precision Meets Flexibility: The Technology Behind Heater Circuits" on Tuesday, August 26th, 2025 at 11 AM EDT.
Trouble in Your Tank: Metallizing Flexible Circuit Materials—Mitigating Deposit Stress
08/04/2025 | Michael Carano -- Column: Trouble in Your TankMetallizing materials, such as polyimide used for flexible circuitry and high-reliability multilayer printed wiring boards, provide a significant challenge for process engineers. Conventional electroless copper systems often require pre-treatments with hazardous chemicals or have a small process window to achieve uniform coverage without blistering. It all boils down to enhancing the adhesion of the thin film of electroless copper to these smooth surfaces.