| 초록 |
2,5-dihydroxyterephthalic acid (DHT), a blue emissive solid, is protonated with a strong base to form a yellow emissive organic salt having potassium ions (DHT-K) as counter ions. Because fluorescence depends on whether the hydrogens in the hydroxyl groups of the compound have deprotonated or not, the fluorescence was changed in response to acid and basic gases. Herein, DHA-K coated with PVA on a glass slide was prepared and used as a solid state sensor for HCl and NH3 gas detection. The PVA film-based sensor was protonated by HCl gas, the maximum emission wavelength shifted from 537 nm to 465 nm, and when the NH3 gas was alternately exposed, it returned to its original wavelength. In addition, fluorescence changes occur repeatedly when exposed to HCl and NH3 gases alternatively. Therefore PVA film-based sensor can be used as reusable sensor for HCl and NH3 gases. |
