서강대학교

초록 (요약문)

Detecting of volatile organic compounds (VOCs) either in gas or liquid form has many methods in the current world. In-hale of indoor voc pollutants causes severe health hazards. So detecting the small concentration of voc in gas or liquid form is very eseential. For that choosing a very easy, quick method is necessary. Photonic crystals (PC) colorimetric sensors has upper hand in easy method detection inspired from the nature wildlife species include plants, butterfly, chameleon which has diverse colors. It has structural color and responds on external stimuli that leads to increase of lattice distance which can be visible to naked eye. Based on that phenomenon, to improve the sensitivity PC device composed of cured thin polymers can induce highly responsive upon chemical stimulus due to different polymers has different swelling properties. Colorimetric sensors have advantages over conventional sensors since it performs switchable colors with the changes in their interparrticle distance. Using the same principle, multi-color patterns on PC composed of different types of polymers exhibit different swelling effects upon solvent reaction. Based on that result, hidden codes were fabricated with thin polymers cured on a PC device and further can generate a secrete message. It is only possible to reveal the initial hidden patterns on the PC when it exposes to a specific solvent, which could enable to convey the secret message to the recipient from the sender.