摘要
在包裹了聚电解质的碳酸钙微球上原位聚合苯胺,形成导电性良好的聚苯胺-聚电解质-碳酸钙(PAN/(PEs)6/CaCO3)微球。采用扫描电子显微镜研究了聚电解质层对碳酸钙微球形貌的影响,以及苯胺单体加入量对碳酸钙-聚电解质-聚苯胺导电复合材料形貌的影响。并用红外光谱和紫外-可见光谱等进行了结构表征。该复合材料有良好的电催化活性,将其滴涂在玻碳电极上,修饰电极对多巴胺氧化显示了较强的催化能力,与碳酸钙修饰电极相比,其氧化峰电位负移了130mV,平行制作5支修饰电极测定4.0mmol/L多巴胺,相对标准偏差为4.2%。该复合材料制备简单、重现性良好,可以构建测定多巴胺的传感器。线性范围0.5～10.0mmol/L,检测限0.2mmol/L(3S/N)。
Polyaniline（PAN） was in-situ formed around calcium carbonate（CaCO3） microparticles previously stabilized with polyelectrolyte layers（PEs）,generating PAN/（PEs） 6/CaCO3 hybrid microparticles.The effects of PEs and concentration of aniline monomer on the stability and morphology of the hybrid microparticles were studied.The obtained hybrid microparticles were characterized by SEM,FT-IR,UV-Vis,etc.Furthermore,the hybrid microparticles were deposited on glassy carbon electrode,which displayed high electrocatalytical activity toward the oxidation of dopamine（DA）.The oxidized peak potential was negatively shifted with a value of 130 mV,compared with that using pure CaCO3 microparticles.The modified electrode showed good reproducibility,and the relative standard deviation（RSD） was estimated to be about 4.2% in 4.0 mmol/L DA aqueous solution（n =5）.The obtained hybrid microparticles have great potential in construction of biosensors.The linear range was in the range of 0.5~10.0 mmol/L,with the detection limit of 0.2 mmol/L（3 S/N）.
出处
《应用化学》
CAS
CSCD
北大核心
2011年第1期22-26,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20905021
20805011)资助项目
关键词
碳酸钙
聚电解质
聚苯胺
核壳结构
多巴胺
CaCO3
polyelectrolyte
polyaniline
core-shell structure
dopamine
