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Interdigitated nanoelectrodes for nanoparticle detection

机译：用于纳米粒子检测的叉指式纳米电极

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摘要

Experimental results on the electrical detection of metal nanoparticles adsorbed on interdigitated nanoelectrode based devices are presented. By adjusting the gap between these electrodes to the diameter of the nanoparticles, we demonstrate that efficient bridging of the electrodes can take place. This phenomenon leads to a strong modification of the conductance of the device. The capability of the nanoelectrodes to detect single adsorption events electrically is demonstrated and reveals that the sensitivity reaches the individual nanoparticle level. This result is proven by current-voltage measurements at room temperature performed in solution during the adsorption of the nanoparticles and after the deposition process and surface drying. The capability of the devices to perform quantitative measurements is also addressed. Even if individual adsorption events could be detected one by one in solution, current-voltage measurements performed after the deposition and drying show that a correlation between the number of particles immobilized on the sensing area of the devices and the electrical characteristic remains difficult. The current flow is dominated by tunnel transport through the junctions formed between the nanoparticles and the nanoelectrodes and the dispersion of the electrical characteristics of the junctions is a limitation for quantifying the number of nanoparticles involved in the electrical response.
机译：提出了电学检测吸附在指状纳米电极基器件上的金属纳米颗粒的实验结果。通过将这些电极之间的间隙调整为纳米粒子的直径，我们证明了可以发生电极的有效桥接。这种现象导致器件电导的强烈改变。证明了纳米电极电检测单个吸附事件的能力，并揭示了灵敏度达到单个纳米颗粒水平。该结果通过在纳米颗粒吸附期间以及沉积过程和表面干燥之后在溶液中进行的室温下的电流-电压测量来证明。还解决了设备执行定量测量的能力。即使可以在溶液中一一检测出单独的吸附事件，在沉积和干燥后进行的电流-电压测量结果表明，固定在设备传感区域上的颗粒数量与电特性之间的相关性仍然很困难。电流主要通过穿过纳米颗粒和纳米电极之间形成的结的隧道传输来控制，并且结的电特性的分散是用于量化电响应中涉及的纳米颗粒数量的限制。

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