Environmental Engineering Program, School of Engineering, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, China.
J Colloid Interface Sci. 2012 May 1;373(1):94-101. doi: 10.1016/j.jcis.2011.11.074. Epub 2011 Dec 6.
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.
新型荧光聚（2-（乙酰乙酰氧基）乙基甲基丙烯酸酯）（PAAEMA）乳胶通过 miniemulsion 聚合采用聚合物助稳定剂合成。在制备的乳胶颗粒中形成了带有β-二羰基的大分子的纳米级聚集体。氨和β-二羰基聚集体组装成超分子配合物，在紫外光下显示出强烈的可见荧光。通过位于紫外-可见光谱中约 275nm 的特征吸收峰证实了配合物的形成。吸收光谱适用于氨检测。表面形态的原子力显微镜（AFM）研究表明，PAAEMA 薄膜的气体传感性能涉及氨的可逆吸收和解吸。PAAEMA 薄膜对氨气敏感，当暴露于 54ppm 的氨气浓度时，响应时间短至 80s。
