Dual-Network Poly(vinyl alcohol)/Sodium Alginate Hydrogel Photonic Crystals Films for Visual Sensing
Poly(vinyl alcohol) (PVA)/sodium alginate (SA) dual-network hydrogels were prepared via the freeze–thaw method. Tensile testing, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and fiber-optic spectroscopy were employed for material characterization, and multiple metal ions were screen...