Scanning Bipolar Electrochemical Microscopy

被引:25
|
作者
Essmann, Vera [1 ]
Santos, Carla Santana [1 ,2 ]
Tarnev, Tsvetan [1 ]
Bertotti, Mauro [2 ]
Schuhmann, Wolfgang [1 ]
机构
[1] Ruhr Univ Bochum, Analyt Chem Ctr Elect Sci CES, Univ Str 150, D-44780 Bochum, Germany
[2] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Av Prof Lineu Prestes, BR-74805513 Sao Paulo, Brazil
基金
巴西圣保罗研究基金会;
关键词
ELECTROCHEMILUMINESCENCE SENSING PLATFORM; MICROELECTRODE ARRAYS; VESICULAR EXOCYTOSIS; SYSTEM; SIZE; FABRICATION; ELECTRODES; SECRETION; RELEASE; OBJECTS;
D O I
10.1021/acs.analchem.8b00928
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Electrochemical techniques offer high temporal resolution for studying the dynamics of electroactive species at samples of interest. To monitor fastest concentration changes, a micro- or nanoelectrode is accurately positioned in the vicinity of a sample surface. Using a microelectrode array, it is even possible to investigate several sites simultaneously and to obtain an instantaneous image of local dynamics. However, the spatial resolution is limited by the minimal electrode size required in order to contact the electrodes. To provide a remedy, we introduce the concept of scanning bipolar electrochemical microscopy and the corresponding experimental system. This technique allows precise positioning of a wireless scanning bipolar electrode to convert spatially heterogeneous concentrations of the analyte of interest into an electrochemiluminescence map of the sample reactivity. After elucidating the working principle by recording bipolar line and array scans, a bipolar electrode array is positioned at the site of interest to record an electrochemical image of the localized release of analyte molecules.
引用
收藏
页码:6267 / 6274
页数:8
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