Resonant-cantilever as micro-instrument to extract activation-energy (Ea) of molecule adsorption for kinetics modeling of gas sensing materials

In this work, resonant microcantilever sensor is firstly used for real-time record of gas uptake on sensing material to extract the key kinetic parameter of activation energy (E_a), which characterizes molecule adsorbing rate. With the extracted parameter of E_a, the important gas sensing performance of response speed can be quantitatively evaluated with theory of molecule sorption kinetics and optimally designed based on modeling guidance. With the developed new method, two CO₂ sensing materials of mono-amine and dual-amine modified mesoporous-silica nanoparticles are examined respectively.