| 摘要 |
PROBLEM TO BE SOLVED: To provide a humidity sensor that has high safety and has a low possibility of giving toxicity or damage to a human body.SOLUTION: A colloidal particle 1 made of a polymer having a dissociative group on the surface of a particle includes: colloidal particles arranged in a film shape in a state having regularity of a level of causing Bragg diffraction; a polarity medium 4 that fills the clearance between the colloidal particles, volume-expands when the water vapor density in an ambient environment is high, and contracts to cause an equilibrium state when the water vapor density is low; and a surface keeping material 5 for keeping the state in which the polarity medium is filled in the clearance between the colloidal particles.SELECTED DRAWING: Figure 2 |
