基于聚丙烯酸-石墨烯复合材料的pH敏感型传感界面构建  

Construction of pH-Responsive sensing interface by using poly (acrylic acid) modified graphene nanosheets

作　　者：张立[1] 谭飞[1] 邱建丁[1] 

机构地区：[1]南昌大学化学系,南昌330031

出　　处：《分析试验室》2013年第11期4-8,共5页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(20865003;21105044);江西省自然科学基金(20114BAB213013)资助

摘　　要：选用还原石墨烯(rGO)和丙烯酸(AA)作为初始反应物,以(NH4)2S2O8为引发剂,通过活性自由基聚合制备聚丙烯酸-石墨烯复合材料(PAA-g-rGO),将其修饰于电极表面后构建了pH敏感型响应性界面。通过红外光谱、扫描电子显微镜等实验表征了PAA-g-rGO复合材料的结构及形貌。采用循环伏安法和交流阻抗法对响应性界面的导电性能、稳定性以及对pH响应的重现性进行了研究。构建的响应性界面具有良好的导电性,对pH有良好的响应性,可通过pH的改变实现K3Fe(CN)6以及肌红蛋白在响应性界面电化学行为的智能调控,且具有良好的重现性、可逆性和稳定性,表明这种pH敏感型响应性界面在酸度测定、新型生物传感器和生物执行器等领域具有良好的应用前景。The composite materials which were responsive to pH have been synthesized by modified graphene nanosheets （rGO） surface with poly （acrylic acid） （PAA）, a pH-sensitive polymer, with the method of in situ living free radical polymerization. The morphologies and electrochemistry of the composite materials were investigated by using scanning electron microscopy and electrochemical techniques including electrochemical impedance spectroscopy and cyclic voltammetry. Results demonstrated the composite materials had the good stability and excellent electric conductivity due to the introduction of graphene and the electrochemical properties of composite materials could be intelligently and reversible switched by varying pH.

关 键 词：活性自由基聚合 石墨烯 聚丙烯酸 智能材料 

分 类 号：O657.1[理学—分析化学]