Abstract
Semiconducting carbon nanotubes (CNTs) have been pursued for use in electronic biosensors for decades. Their all-surface molecular structure, sizeable semiconducting bandgap, and solution-phase compatibility make them highly sensitive and versatile options for transducing target bioelectrical signals. However, amid the thousands of reports on CNT-based electronic biosensors, very little attention has been given to identifying (let alone addressing) the impact of leakage current, signal drift, and device-to-device variation. This talk will present recent results focused on tackling these issues with specific emphasis on printed CNT-based biosensors. For instance, a variety of passivation strategies were studied to determine the role of leakage current for CNT transistor-based biosensors (i.e., bioFETs or ion-sensitive FETs), revealing that a bilayer epoxy/high-k dielectric stack was most effective at minimizing unwanted leakage current. The influence of signal drift will also be demonstrated, likely playing a significant role in many previous reports of CNT-based biosensors characterized by sequential concentration spikes. Finally, strategies for addressing device-to-device variation in these biosensors will be discussed, including the motivation for a printed thin-film device rather than a single-CNT configuration. Two things seem certain about this field: 1) the promise of CNT-based biosensors continues to suggest they are worth ongoing pursuit, and 2) there is much work remaining towards achieving a reproducible, reliable electronic biosensing technology from CNTs.
Published Version
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