Detection of Subtle Environmental Changes by Structural Colors of Soft Colloidal Nanoparticle Films
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초록
내용
Structural colors of a self-assembled colloidal particles and a thin polymer film have long been studied for engineering stimuli-responsive colorimetric sensors. Because structural color of colloidal structure is determined by various parameters such as refractive index, lattice spacing, and angle of incident light, a flexible-, and soft colloidal structure is promising tools for designing stimuli-responsive colorimetric sensors. Here, I introduce two examples of structural color sensors made of self-assembled colloidal structures that response chemical and physical stimulus. By introducing thin colloidal crystal membrane and high refractive index dopamelanin nanoparticles film, subtle changes of physical and chemical stimulus can be detected, respectively. Such strategy can offer preparation of sensitive, cost-effective and energy-efficient colorimetric sensors that can be applied to miniaturized devices and disposable chemical indicators.