| Title: | Control of the Intrinsic Sensor Response to Volatile Organic Compounds with Fringing Electric Fields |
| Author(s): | Henning A; Swaminathan N; Vaknin Y; Jurca T; Shimanovich K; Shalev G; Rosenwaks Y; |
| Address: | "Department of Physical Electronics, School of Electrical Engineering, Tel-Aviv University , Ramat-Aviv 69978, Israel" |
| DOI: | 10.1021/acssensors.7b00754 |
| ISSN/ISBN: | 2379-3694 (Electronic) 2379-3694 (Linking) |
| Abstract: | "The ability to control surface-analyte interaction allows tailoring chemical sensor sensitivity to specific target molecules. By adjusting the bias of the shallow p-n junctions in the electrostatically formed nanowire (EFN) chemical sensor, a multiple gate transistor with an exposed top dielectric layer allows tuning of the fringing electric field strength (from 0.5 x 10(7) to 2.5 x 10(7) V/m) above the EFN surface. Herein, we report that the magnitude and distribution of this fringing electric field correlate with the intrinsic sensor response to volatile organic compounds. The local variations of the surface electric field influence the analyte-surface interaction affecting the work function of the sensor surface, assessed by Kelvin probe force microscopy on the nanometer scale. We show that the sensitivity to fixed vapor analyte concentrations can be nullified and even reversed by varying the fringing field strength, and demonstrate selectivity between ethanol and n-butylamine at room temperature using a single transistor without any extrinsic chemical modification of the exposed SiO(2) surface. The results imply an electric-field-controlled analyte reaction with a dielectric surface extremely compelling for sensitivity and selectivity enhancement in chemical sensors" |
| Keywords: | "Butylamines/analysis Ethanol/analysis Nanowires Sensitivity and Specificity Silicon Dioxide *Static Electricity Transistors, Electronic Volatile Organic Compounds/*analysis chemical sensor fringing electric field intrinsic sensor response kelvin probe for;" |
| Notes: | "MedlineHenning, Alex Swaminathan, Nandhini Vaknin, Yonathan Jurca, Titel Shimanovich, Klimentiy Shalev, Gil Rosenwaks, Yossi eng Research Support, Non-U.S. Gov't 2017/12/27 ACS Sens. 2018 Jan 26; 3(1):128-134. doi: 10.1021/acssensors.7b00754. Epub 2018 Jan 11" |
