Transparent and Breathable Temperature/Humidity Sensor using Ion Gel and Elastomer Nanosheet

Abstract

Temperature sensor and humidity sensor, that are transparent, highly breathable and flexible, were fabricated using elastomer nanosheet and ionic liquid gels with different hydrophilicity. Both sensors showed light transmittance of more than 75% in the visible light range and moisture transmittance 2.8 times higher than transepidermal water loss of human skin. The temperature sensor showed a logarithmic response to temperature, with a sensitivity of 3.2∼2.0%/℃, while humidity sensor showed a linear response to humidity, with a sensitivity of 0.9%/percentage of relative humidity.