
– A joint research team from POSTECH and KAIST develops self-powering, color-changing humidity sensors
– Applicable to various fields including smart windows, health care and safety management
Smart windows that automatically change colors depending on the intensity of sunlight are gaining attention as they can reduce energy bills by blocking off sun’s visible rays during summer. But what about windows that change colors depending on the humidity outside during the monsoon season or on hot days of summer? Recently, a Korean research team has developed the source technology for smart windows that change colors according to the amount of moisture, without needing electricity.
The joint research team comprised of Professor Junsuk Rho of departments of mechanical and chemical engineering, Jaehyuck Jang and Aizhan Ismukhanova of chemical engineering department at POSTECH, and Professor Inkyu Park of KAIST’s department of mechanical engineering. Together, they successfully developed a variable color filter using a metal-hydrogel-metal resonator structure using chitosan-based hydrogel, and combined it with solar cells to make a self-powering humidity sensor. These research findings were published as a cover story in the latest edition of Advanced Optical Materials, a journal specializing in nanoscience and optics.
Sensors using light are already widely used in our daily lives in measuring the ECG, air quality, or distance. The basic principle is to use light to detect changes in the surroundings and to convert them into digital signals.
Fabri-Pero interference is one of the resonance phenomena that can be applied in optical sensors and can be materialized in the form of multilayer thin films of metal-dielectric-metal. It is known that the resonance wavelength of transmitted light can be controlled according to the thickness and refractive index of the dielectric layer. However, the existing metal-dielectric-metal resonators had a big disadvantage in not being able to control the wavelengths of transmitted light once they are manufactured, making it difficult to use them in variable sensors.
The research team found that when the chitosan hydrogel is made into the metal-hydrogel-metal structure, the resonance wavelength of light transmitted changes in real time depending on the humidity of the environment. This is because the chitosan hydrogel repeats expansion and contraction as the humidity changes around it.
Using this mechanism, the team developed a humidity sensor that can convert light’s energy into electricity by combining a solar battery with a water variable wavelength filter made of metal-hydrogel-metal structured metamterial that changes resonance wavelength depending on the external humidity.
The design principle is to overlap the filter’s resonance wavelength with the wavelength where the absorption of the solar cells changes rapidly. This filter is designed to change the amount of light absorption of solar cells depending on the amount of moisture, and to lead to electric changes that ultimately detect the surrounding humidity.
Unlike the conventional optical humidity sensors, these newly developed ones work regardless of the type of light, whether it be natural, LED or indoor. Also, not only does it function without external power, but it can also predict humidity according to the filter’s color.
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
Self-powering color-changing humidity sensors
- Your Complete Guide To Building a Twin Registry, According to Someone Who’s Having Twins
With the Well+Good SHOP, our editors put their years of know-how to work in order to pick products (from skin care to self ... has sensor-free breathing monitoring so you can make sure your little one ...
- Paper Keyboard Is Self-Powered
But engineers at Purdue have printed a self-powered Bluetooth keyboard on an ordinary sheet of paper. You can see videos of the keyboards at work below. The keyboards work by coating paper with a ...
- The 7 Best Home Weather Stations of 2023 for a Personalized Local Forecast
A home weather station can be a great purchase for many people—including gardeners and avid trail runners or families with kids who never want to wear their boots–or even those whose question of the ...
- Humidity Sensor Shootout
If you want to measure humidity (and temperature ... electron microscope to figure out what’s going on. The other sensors were fine, with the HTU21D and SHT71 being standouts for their ultra ...
- 15 Best Color Changing Nail Polishes
Why pick one polish shade when you can have color changing nail polish ... Like most of Essie’s polishes, this one is self-leveling so you’re less likely to see brushstrokes which is always ...
Go deeper with Google Headlines on:
Self-powering color-changing humidity sensors
[google_news title=”” keyword=”self-powering color-changing humidity sensors” num_posts=”5″ blurb_length=”0″ show_thumb=”left”]
Go deeper with Bing News on:
Smart windows
- TP-Link’s Tapo brand adds a hub to its smart home offerings
The Tapo H100 Smart Hub with Chime works with Tapo contact and motion sensors. It’s cheap, but it's not the brains for a full smart home system.
- Biden’s Smart Immigration Idea
The Welcome Corps allows Americans to sponsor groups of vetted migrants seeking asylum and help newcomers settle in their communities.
- Smart Windows Materials Market Size and Forecast till 2030
The "Smart Windows Materials Market" Study Describes how the technology industry is evolving and how major and ...
- Hey, Siri: Hackers Can Control Smart Devices Using Inaudible Sounds
Ultrasound Inaudible Trojan" (NUIT), allows an attacker to exploit smartphones and smart speakers over the Internet, using sounds undetectable by humans.
- Global Smart Windows Market (Recent Report) 2023 is Anticipated to Grow at a CAGR During 2028
Global Smart Windows Market research report offers a detailed analysis of valuable insight into the market state and ...
Go deeper with Google Headlines on:
Smart windows
[google_news title=”” keyword=”smart windows” num_posts=”5″ blurb_length=”0″ show_thumb=”left”]