A two-terminal silicon nanoribbon field-effect pH sensor

摘要

This paper reports on a two-terminal silicon nanoribbon u0002SiNRu0003 field-effect pH sensor operated innelectrolyte. Observed experimentally and confirmed by modeling, the sensor is activated bynself-gating with a gate bias set by the potential difference of the two terminals. The effect of this gatenbias on the SiNR conductance is modulated by the potential drop over the electrical double layernu0002EDLu0003 established on the SiNR surface, similarly to the threshold voltage modulation by EDL in anthree-terminal SiNR field-effect transistor with an independent gate electrode. The potential dropnover EDL is determined by the pH value of the electrolyte. © 2010 American Institute of Physics.nu0004doi:10.1063/1.3532964