Monitoring sun exposure with a portable paper sensor

May 25, 2016, American Chemical Society

Summer is around the corner—time for cookouts and sunbathing. But too much sun can result in sunburn, which is the main cause of skin cancer. Because the time it takes to get burned depends on many factors, it is not easy to tell when to seek shade. To help people stay safe, researchers report in ACS Sensors the development of a paper-based sensor for monitoring sun exposure given different skin tones and sunscreen levels.

Most currently available UV require high-tech gadgets to operate, such as smartphones or wearable devices. Recently, single-use, disposable sunburn sensors have come onto the market. However, some of these sensors use substances that are potentially harmful to people or the environment. Others are only good for specific skin tones. Thus, J. Justin Gooding and colleagues set out to create a disposable sunburn sensor that is inexpensive, is composed entirely of safe and benign materials and can be easily calibrated to take into account different skin tones and SPFs of sunscreens that are applied on the skin.

The group created a sun-exposure sensor by inkjet printing titanium dioxide, a nontoxic and inexpensive compound, and a food dye on paper. When enough UV radiation hits the sensor, causes the dye to change color, warning people to get out of the sun or apply more sunscreen. To adjust the sensor for various skin tones and sunscreen use, the group added UV neutral density filters that can speed up or slow down the discoloration time of the sensor.

Explore further: Some sun protection behaviors up with history of NMSC

More information: Parisa S. Khiabani et al. Paper-Based Sensor for Monitoring Sun Exposure, ACS Sensors (2016). DOI: 10.1021/acssensors.6b00244

An easy to use and easy to fabricate sun exposure sensor was prepared via the inkjet printing of titanium dioxide (TiO2), polyvinylpyrrolidone (PVP), and food dye on paper. The sun exposure sensor works by employing titanium dioxide (TiO2) as a photocatalyst to degrade the food dyes resulting in gradual discoloration of this film. The PVP serves as a binder to allow film formation. The discoloration can be observed by the naked eye or quantitatively monitored using UV–vis reflectance spectra. Finally, discoloration of the films was calibrated to match UV exposure time of different skin types, by using different UV neutral density filters with the ability to transmit between 1.5% and 70% of the irradiant UV light from the sources to the photoactive film.

Related Stories

Some sun protection behaviors up with history of NMSC

May 23, 2016

(HealthDay)—Individuals with previous nonmelanoma skin cancer (NMSC) are more likely to engage in certain sun protection behaviors than those without previous NMSC, according to a study published online May 16 in the Journal ...

Tips for staying safe in the sun

May 26, 2014

(HealthDay)—The Memorial Day weekend marks the unofficial start of summer, and that means it's time to remind you about sun safety to reduce your risk of skin cancer.

Screening the sun: We still need to cover up, researchers say

November 20, 2012

(Medical Xpress)—Covering up and staying out of the sun for prolonged periods of time, especially in the middle of the day, is still the best way to protect ourselves from damaging ultraviolet (UV) radiation, claims a University ...

Recommended for you


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.