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Water-mediated electrochemical nano-writing on thin ceria films

机译：氧化铈薄膜上水介导的电化学纳米书写

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摘要

Bias dependent mechanisms of irreversible cathodic and anodic processes on a pure CeO_2 film are studied using modified atomic force microscopy (AFM). For a moderate positive bias applied to the AFM tip an irreversible electrochemical reduction reaction is found, associated with significant local volume expansion. By changing the experimental conditions we are able to deduce the possible role of water in this process. Simultaneous detection of tip height and current allows the onset of conductivity and the electrochemical charge transfer process to be separated, further elucidating the reaction mechanism. The standard anodic/cathodic behavior is recovered in the high bias regime, where a sizable transport current flows between the tip and the film. These studies give insight into the mechanisms of the tip-induced electrochemical reactions as mediated by electronic currents, and into the role of water in these processes, as well as providing a different approach for electrochemical nanowriting.
机译：使用改进的原子力显微镜（AFM）研究了纯CeO_2薄膜上不可逆的阴极和阳极过程的偏倚机理。对于施加到AFM尖端的适度正偏压，发现发生不可逆的电化学还原反应，并伴有明显的局部体积膨胀。通过更改实验条件，我们可以推断出水在此过程中的可能作用。尖端高度和电流的同时检测可以将电导率的开始和电化学电荷转移过程分开，从而进一步阐明反应机理。在高偏压状态下恢复了标准的阳极/阴极性能，在此状态下，尖端和薄膜之间流过大量的传输电流。这些研究深入了解了由电流介导的尖端诱导的电化学反应的机理，以及水在这些过程中的作用，并为电化学纳米书写提供了另一种方法。

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