Fabrication and characterization of a hydroquinone-functionalized polypyrrole thin-film pH sensor
Fabrication and characterization of a hydroquinone-functionalized polypyrrole thin-film pH sensor
复制标题
DOI：
10.1021/cm9506114
复制
发表时间：
1996-11-01
影响因子：
8.6
通讯作者：
Pigram, PJ
中科院分区：
文献类型：
--
作者：
AquinoBinag, CN;Kumar, N;Pigram, PJ
研究了以二甲氧基苯基和二羟基苯基为官能团在s位衍生的聚吡咯（PPy）的理化性质及其对pH值的响应。在碳酸丙烯酯电解质溶液中，用高氯酸盐掺杂对单体进行了电化学聚合。所得薄膜的电位特性显示出46.0 mV pH(-1)（25℃）的亚能氏响应；检出限为1 × 10(-10) mol dm(-1)；电位漂移+/-1.9 mV，迟滞系数低，斜率= +/-1.9 mV pH（-1）。x射线光电子能谱（XPS）显示，与聚吡啶相比，功能化聚吡啶的碳Is和氯2p光电子峰宽度减小，表明存在β -碳取代基。飞行时间二次正离子质谱在m/z值为107和109处出现峰，表明在功能化PPy的最外层膜表面存在对苯二酚类物质。功能化单体的结构经核磁共振和核磁共振确证。循环伏安法（CV）显示了结合到PPy重复单元中的对苯二酚功能的预期电化学响应，功能化聚吡咯为将电活性物质、导电支撑和机械支撑集成在一起的pH传感器装置提供了潜力。
The physical and chemical properties of polypyrrole (PPy) derivatized at the S-position with dimethoxybenzyl and dihydroxybenzyl functionalities via a novel high-yield pathway were evaluated for pH response. The monomers were electrochemically polymerized with perchlorate dopant in a propylene carbonate electrolyte solution. The potentiometric characteristics of the resulting films show a sub-Nernstian response of 46.0 mV pH(-1) (25 degrees C); a detection limit of 1 x 10(-10) mol dm(-1); potential drift of +/-1.9 mV and a low hysteresis with aslope = +/-1.9 mV pH(-1). X-ray photoelectron spectroscopy (XPS) shows a reduction in the carbon Is and chlorine 2p photoelectron peaks widths for functionalized PPy in comparison with the PPy indicating presence of beta-carbon substituents. Time-of-flight secondary positive ion mass spectra showed peaks at m/z values of 107 and 109, indicating the presence of hydroquinone species at the outermost film surface of the functionalized PPy. The structure of the functionalized monomers was confirmed by C-13 and H-1 NMR. Cyclic voltammetry (CV) showed the expected electrochemical response of the hydroquinone functionality incorporated into the PPy repeat unit, Functionalized polypyrrole offers potential for pH sensor devices with the electroactive species, conductive support, and mechanical support in an integrated form.