Detection of polar organic vapours with piezoelectric crystals coated with crown ethers

✍ Scribed by Lu Chia-Jung; Shih Jeng-Shong

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 720 KB
• Volume: 306
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)00676-d

✦ Synopsis

An oscillating piezoelectric crown-ether-coated quartz crystal membrane detector with a computer interface for signal processing was prepared to detect polar organic vapours. The piezoelectric crown ether/quartz membrane detector exhibited high sensitivity with a frequency shift range of lo-340 Hz/(mg/l) for organic gases, a short response time ( < 2.0 min).

good selectivity and good reproducibility for reusage. Several coatings on quartz membrane crystals based on benzo-15crown-5 and cryptand-were made for responses to organic amines, alcohols, ketones, halides, carboxylic acids and sulfides. Benzo-1%crown-5 functioned as a sensitive coating for alcohols, amines and organic sulfides whereas cryptandwas sensitive to amines and carboxylic acids. Steric effects and isomer effects on frequency shifts of the quartz crystal detector based on benzo-15-crown-5

for alcohols and amines were also investigated.