Reversible potentiometric oxygen sensors based on polymeric and metallic film electrodes.
Reversible potentiometric oxygen sensors based on polymeric and metallic film electrodes.
复制标题
基于聚合物和金属膜电极的可逆电位氧传感器。
DOI：
10.1021/ac00041a008
复制
发表时间：
1992
影响因子：
7.4
通讯作者：
Meyerhoff,ME
中科院分区：
文献类型：
--
作者：
Yim,HS;Meyerhoff,ME
各种材料和传感器配置，表现出可逆的电位响应，在室温下的氧分压在中性pH值的溶液进行检查。在一种布置中，铂电极涂覆有掺杂有钴（II）四乙烯五胺络合物的增塑聚（氯乙烯）膜。对于这样的传感器，电位氧响应归因于源自下面的铂电极表面的混合电位以及Co（11）-四烯掺杂膜的氧化还原电位的变化，因为络合物可逆地结合氧。由于铂表面的响应是由Co（II）-tetren/PVC膜的存在下延长。或者，电化学沉积在铂上和/或溅射或气相沉积在单晶硅衬底上的金属铜薄膜可用于可逆氧传感。这种铜膜传感器的长期可逆性和电位稳定性可通过以下方式得到增强（最多1个月）：通过工作电极施加外部非极化阴极电流，防止在表面形成氧化亚铜，或者专门使用具有[100]优选晶体结构的溅射铜膜（通过X射线衍射测定）。氧气是化学传感的一个非常重要的目标，因为它的存在控制着环境、体内和许多工业过程中的各种过程。现有的氧传感器可以大致分为两类：（a）电化学和（B）光学。电化学类型包括经典的克拉克式电流/极谱装置、* 1电流传感器2和仅在高温下工作的固态电解质（例如，氧化钙/钇掺杂氧化锆）电位传感器3。较新的光纤氧传感器通常是平衡装置，其基于可逆结合氧的分子的吸光度的变化或基于氧猝灭各种芳香族物质（包括蒽和芘衍生物、卟啉等）的荧光或磷光的能力。4
Various materials and sensor configurations that exhibit reversible potentiometric responses to the partial pressure of oxygen at room temperature In neutral pH solution are examined. In one arrangement, platinum electrodes are coated with plasticized poly (vlnyl chloride) films doped with a cobalt (II) tetraethylene pentamlne complex. For such sensors, potentiometric oxygen response Is attributed to a mixed potential originating from the underlying platinum electrode surface as well as a change In redox potential of the Co (11)-tetren-doped film as the complex binds oxygen reversibly. The response due to the platinum surface Is prolonged by the presence of the Co (II)-tetren/PVC film. Alternately, thin films of metallic copper, electrochemIcally deposited on platinum and/or sputtered or vapor deposited on a single crystal silicon substrate, may be used for reversible oxygen sensing. The long-term reversibility and potentiometric stability of such copper film-based sensors Is enhanced (up to 1 month) by preventing the formation of cuprous oxide on the surfaces via the application of an external nonpolar-izing cathodic current through the working electrode or by specifically using sputtered copper filmsthat have [100] preferred crystal structures as determined by X-ray diffraction. The implications of these findings In relation to fabricating analytically useful potentiometric oxygen sensors are discussed.Oxygen gas is a very important target forchemical sensing because its presence controls various processes in theenvironment, in vivo, and in numerous industrial processes. Existing oxygen sensors can be grouped broadly into two categories;(a) electrochemical and (b) optical. The elec-trochemical type include classical Clark style amperometric/polarographic devices,* 1 galvanic sensors, 2 and solid-state electrolyte (eg, calcia/yttrium-doped zirconia) potentiometric sensors3 that operate only at high temperatures. Newer optical fiber oxygen sensors are generally equilibrium devices that are based on changes in the absorbance of molecules that bind oxygen reversibly or on the ability of oxygen to quench the fluorescence or phosphorescence of a wide variety of aromatic species (including anthracene and pyrene de-rivatives, porphyrins, etc.). 4