13.4.16

You are invited to attend a lecture

By

Alex Henning

Ph.D. student of Professor Yossi Rosenwaks

Electrical Engineering, Physical Electronics Department

Tel Aviv University

Electrostatically-formed Nanowire based Gas Sensor

To date, there is no gas sensing technology that can be directly incorporated into mobile electronic devices. A miniature sensing platform is required that is sufficiently stable as well as highly sensitive and selective to gaseous analytes, and compatible with standard semiconductor technology. A sensing technology based on a planar multiple gate field-effect transistor, the electrostatically-formed nanowire (EFN) based device, was recently introduced by our group for protein detection in liquid. This EFN device is compatible with CMOS technology.

In this talk, we demonstrate the EFN device as a sensor for volatile organic compounds (VOCs) of concentrations down to several parts per million. We show that analyte detection can be controlled with the fringing electric field strength at the sensor surface by adjusting the voltages applied to the surrounding gates. In this way, the sensor response can be tuned and selectivity enhanced. Furthermore, we show by atomic force microscopy based techniques and I-V characteristics that The EFN shape and position can be controlled with the bias applied on the two junction gates and the back gate.

Wednesday, 13 April 2016, at 16:00

Room 206, Wolfson Mechanical Engineering Building