Scanning electrochemical microscopy
Scanning electrochemical microscopy
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DOI：
10.1021/ac00194a002
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发表时间：
1989-10
影响因子：
7.4
通讯作者：
R. Engstrom;C. Pharr
中科院分区：
文献类型：
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作者：
R. Engstrom;C. Pharr
现代电分析化学依赖于日益复杂的界面设计来提高选择性、灵敏度和适应性。化学修饰、聚合物膜、复合材料和微电极阵列是电极-溶液界面在从微观到原子的维度水平上具有空间异质性的方案的示例。利用光学显微镜、电子显微镜、ESCA、拉曼微探针和扫描隧道显微镜（STM）等技术，这些表面的化学和物理结构现在可以用从微米到原子水平的空间分辨率来表征。然而，这些技术不直接提供关于电化学活性的信息。结构-活性关系的知识可以最终导致电分析装置的优化设计，并提高我们解释复杂电极设计产生的数据的能力。例如，复合电极表面的哪一部分与溶液电化学连通？电化学“热点”是否存在于发生成核等事件的表面上？做一个聚-
Modern electroanalytical chemistry re-lies on increasingly complicated inter-facial designs to achieve improved se-lectivity, sensitivity, and adaptability. Chemical modifications, polymer films, composite materials, and micro-electrode arrays are examples of schemes in which the electrode-solu-tion interface possesses spatial heterogeneity on a dimensional level ranging from the microscopic to the atomic. The chemical and physical structure of such surfaces can now be characterized with spatial resolutions ranging from the micrometer to the atomic levels us-ing techniques such as optical and electron microscopy, ESCA, Raman microprobe, and scanning tunneling micros-f= acus copy (STM). However, these techniques do not directly provide information about electrochemical activity. Knowl-edge of structure-activity relationships could ultimately lead to optimized designs of electroanalytical devices and increase our ability to interpret data generated with complicatedelectrode designs.There are many examples of ques-tions related to thespatial distribution of electrochemical activity. For in-stance, what fraction of a composite electrode surface is in electrochemical communication with thesolution? Are electrochemical “hot spots” present on surfaces where events such as nucleation occur? Do defects existin a poly-