Industrial Technology Research Institute

Chun-Yuan Lee

Chia-Jung Lu

Ping Ping Tsai

A porous poly(2-acryl-amido-2-methyl-propane sulphonic acid)-based humidity sensing element is disclosed which provides improved range of humidity measurement and response time with little or no hysteresis. It includes: (a) a non-conductive substrate which has a pair of electrodes formed thereon; (b) a porous poly(2-acryl-amido-2-methyl-propane sulphonic acid) film formed on said electrodes. The porous poly(2-acryl-amido-2-methyl-propane sulphonic acid) film is formed by first forming a non-porous poly(2-acryl-amido-2-methyl-propane sulphonic acid) film on the electrodes, then subjecting the non-porous poly(2-acryl-amido-2-methyl-propane sulphonic acid) film to a heat treatment at temperatures between about 170&deg; C. and 240&deg; C. such that a porous structure is formed in said poly(2-acryl-amido-2-methyl-propane sulphonic acid) film. The poly(2-acryl-amido-2-methyl-propane sulphonic acid) can be modified by incorporating a cation, such as hydrogen, lithium, potassium, sodium, ammonium, primary, secondary, and tertiary amine ions, and tetra-alkyl ammonium ions.

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Chiang-Fu Hsien, Taiwan

Chun-Yuan Lee