Sensor applications using carbon photonic ball
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Opal has the property of a photonic crystal that selectively reflects only light of a specific wavelength by reinforcing and offsetting visible light by forming a lattice structure with particles of similar size to visible light. Since the inverse opal structure has the same optical characteristics as the opal structure, a material that is difficult to directly form the opal structure is used as a mold to make the Inverse opal structure material into a photo crystal. In this study, emulsified polystyrene particles were used as molds to absorb and carbonize fructose solutions. A polystyrene/carbon Hybrid photonic ball was prepared, and the polystyrene was removed to obtain a carbon photonic ball. Substances made by dehydrating sugars with acid catalysts have abundant carboxyl groups. Due to the presence of these carboxyl groups, they can be deprotonated according to pH to have a surface charge, which gives them the ability to expand and contract in water. It was fused with the properties of photonic crystals and applied as a pH sensor that changes reflective color according to pH.