Electrochemical redox cycling in a new nanogap sensor: Design and simulation

•A new geometry for a nanogap sensor is introduced.•Finite element analysis is employed to yield straightforward device design rules.•The performance of the nanogap device in microfluidic channel is evaluated.

We propose a new geometry for nanogap electrochemical sensing devices. These devices consist of two closely spaced side-by-side electrodes which work under redox cycling conditions. Using finite element simulations, we investigate the effects of different geometric parameters on the redox cycling signal amplification to gain insight into the electrochemical sensing performance of the device design. This will allow optimizing the sensor performance of devices to be fabricated in the future.