Ionogel Sensor for Reproducible Detection of Trace Methamphetamine Analogues

• • Achieves a theoretical detection limit of 317 ppt for MPEA vapor at room temperature, enabling sub-ppb trace detection critical for early interception of illicit substances. • • Exhibits over 72.6% visible-light transmittance, allowing fully transparent and flexible sensor integration on poly(ethylene naphthalate) substrates for concealed deployment. • • Demonstrates reproducible sensing via non-covalent interactions, with high selectivity and consistency across repeated cycles, essential for reliable field use. • • Maintains stable performance under mechanical bending, confirming mechanical robustness for wearable or conformal applications in dynamic environments.