Ammonia gas-sensing characteristics of fluorescence-based poly(2-(acetoacetoxy)ethyl methacrylate) thin films.
Novel fluorescent poly(2-(acetoacetoxy)ethyl methacrylate)(PAAEMA) latexes have been synthesized by miniemulsion polymerization employing a polymeric costabilizer. Nanoscale aggregates of macromolecules bearing β-dicarbonyl are formed in the prepared latex particles. Ammonia and the β-dicarbonyl aggregates assemble a supramolecular complex, which exhibits strong visible fluorescence under UV light. The formation of the complex is confirmed by the characteristic absorption peak located at about 275 nm in UV-Vis spectra. The absorption spectrum has been found to be applicable for ammonia detection. Atomic Force Microscopy (AFM) studies of surface morphology reveal that gas-sensing properties of the PAAEMA thin films involve the reversible absorption and desorption of ammonia. PAAEMA thin films are sensitive to ammonia gas and have a short response time of 80s when exposed to 54 ppm of ammonia gas concentration.
Environmental Engineering Program, School of Engineering, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Jing
J
He
Tong-Yi
TY
Zhang
Guohua
G
Chen
D000641:Ammonia / Q000032:analysis*; D005453:Fluorescence; D005740:Gases / Q000032:analysis; D008567:Membranes, Artificial; D015394:Molecular Structure; D011109:Polymethacrylic Acids / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties
D005740:Gases; D008567:Membranes, Artificial; D011109:Polymethacrylic Acids; C535266:poly(2-(acetoacetoxy)ethyl methacrylate); D000641:Ammonia