负载金纳米粒子的聚苯乙烯/聚丙烯酸微球的合成及pH响应性能  

Synthesis of the Supported Au Polystyrene/poly( acrylic acid) Composite Microspheres and Their pH Regulated Performance

作　　者：滕小波 张春霞 张颖[1] 

机构地区：[1]应用表面与胶体化学教育部重点实验室,陕西师范大学化学化工学院,西安710062

出　　处：《高等学校化学学报》2016年第8期1509-1520,共12页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21173141);陕西省工业攻关项目(批准号:2011K08-14);教育部长江学者和创新团队发展计划(批准号:IRT-14R33)资助~~

摘　　要：以两步聚合法合成的聚苯乙烯(PS)/聚丙烯酸(PAA)核-壳结构复合微凝胶为载体,硼氢化钠为还原剂,柠檬酸钠为稳定剂,通过原位控制性还原获得pH敏感性微凝胶负载纳米金粒子的PS/PAA-Au复合材料.研究发现,不同酸碱条件时,复合微凝胶壳层高分子链的溶胀/收缩变化,不仅可以调节纳米金粒子的表面等离子吸收,还可以调节反应底物的扩散传质,即借助载体微环境的变化来调控纳米金光学性能和催化性能,从而实现复合纳米金材料的pH调控性.The core-shell polystyrene（ PS）/poly（ acrylic acid）（ PAA） composite microgels with p H sensitivity were synthesized via two-step polymerization method. Au nanoparticles were supported onto p H sensitivity composite microgels via in situ reduction of chloroauric acid（ HAuCl_4） using NaBH_4 as reduction agent and sodium citrate as stabilizer. The results demonstrated that the plasmonic coupling of gold nanoparticles could be regulated,and the diffusion of reactive substrates availably controlled,due to the shrinkage and swelling performance of the shell chains under the different acid and alkali conditions. The optical property and catalytic activity of Au NPs could be regulated by changing the micro-environment of composite microgels.Therefore,the performance of composite materials could be realized the p H-controllable.

关 键 词：高分子微凝胶 PH敏感性 纳米金 表面等离子共振 载体催化剂 

分 类 号：O648[理学—物理化学]