pH Response of Silicon Nanowire Sensors: Impact of Nanowire Width and Gate Oxide

We present a systematic study of the performance of silicon nanowires (SiNWs) with different widths when they are used as ion-sensitive field-effect transistors (ISFETs) in pH-sensing experiments. The SiNW widths ranged from 100 nm to 1 mu m. The SiNW-ISFETs were successfully fabricated from silicon-on-insulator (SOT) wafers with Al2O3 or HfO2 as gate dielectric. All the SiNWs showed a pH Response close to the Nernstian limit of 59.5 mV/pH at 300 K, independent of their width, or the investigated gate dielectric or operating mode. Even nanowires (NWs) in the 100 nm range operated reliably without degradation of their functionality. This result is of importance for a broad research field using SiNW sensors as a candidate for future applications.


Published in:
Sensors And Materials, 25, 8, 567-576
Year:
2013
Publisher:
Tokyo, Myu, Scientific Publishing Division
ISSN:
0914-4935
Keywords:
Laboratories:




 Record created 2014-01-09, last modified 2018-09-13


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