Carboxymethyl Cellulose-Based Organogel for Anticounterfeiting via Synergistic Optoelectronic Dual-Signal Encoding

Rapid IT advances render traditional single-signal encryption inadequate for complex anticounterfeiting demands. In this work, we developed a CMCNa-based organic gel (CMCNa₁/(EuW₁₀)_0.07/LiCl_0.1) with synergistic optoelectronic signals, using EuW₁₀ as the fluorescence source and CMCNa as the matrix, synthesized via one-pot thermal polymerization at 55 °C for 4 h and low-temperature treatment at 4 °C for 1 h. The organic gel demonstrates outstanding mechanical properties (tensile strength of 0.78 MPa and fracture elongation of 1282%), excellent fluorescence tunability, high transparency (>80%), ionic conductivity (2.3 mS cm^–1), and significant strain sensitivity (GF = 5.86). HCl/FeCl₃-modulated fluorescence enables UV-specific encrypted information that can be erased with KOH/EDTA for recyclable rewriting. Integrating fluorescence, strain sensing, and Morse code enhances security via dual optoelectronic signals, advancing high-performance anticounterfeiting and digital security.