BERKELEY SENSOR & ACTUATOR CENTER
UC BERKELEY UC DAVIS
User: Guest |  Site Map |  My BSAC Profile
HOME  PROJECTS  THRUSTS  PUBLICATIONS  ABOUT BSAC  DIRECTORY  ALUMNI  FOR BSAC RESEARCHERS  EVENTS CALENDAR  SECURE LOGIN
Table of all Projects
     
 

BPN507: Ultra-low Voltage Field Ionization of Gases in Vacuum and Atmospheric Pressure Based on Semiconductor Nanotips

Project ID BPN507
Website
Start Date Tue 2009-Feb-24 10:52:35
Last Updated Thu 2011-Feb-03 00:13:24
Abstract This project aims to develop highly sensitive, real-time and low voltage gas ionization sensors. We have successfully fabricated and characterized branched silicon nanowhiskers with extremely sharp tips. Arrays of these sharp tips are used because of their small tip radii and high aspect ratio which allow for high electric fields at low voltages. When the device is biased, the nanowires are at the highest potential and the collector (anode) is at the lowest potential, at this stage the electrons in the outer shell of the gas atoms (molecules) tunnel out due to the large geometrical field enhancement at the tip of these nanostructures. This tunneling effect is a quantum-mechanical process which occurs when a strong electric field is applied. The magnitude of electric field required to ionize these gases is still several hundred million volts per centimeter. Our nanostructures however allow for sub-10 volts ionization of various gaseous pecies which can be used for real-time detection of gasses. This also allows us to design low-power discharge devices such as miniaturized gas ionization sensors and mass spectrometers. The project entails fabrication of high aspect ratio field-intensifying nanostructures, and then tailoring these nanostructures to enable field-ionization of gas molecules at sub-10 volts. The sensor are characterized in a custom-made vacuum chamber with several gas inlets and electrical feedthroughs.
Status Continuing
Funding Source
IAB Research Area NanoTechnology: Materials, Processes & Devices
Researcher(s) Jackie Jinyong Oh, Avinash Nayak
Advisor(s) M. Saif Islam
Detailed Information
Secure Access

Private Abstract
Research Report
Poster
Summary Slide PDF | VIDEO
Can’t view video click here
Active Feedback (or Request for Response)

 

  • Copyright Notification: All papers downloaded from this site are © University of California or the publisher, all rights reserved. Contact the BSAC Webmaster for permission related to copyrighted materials.
  • Links on these pages to commercial sites do not represent endorsements by UC or its affiliates.
  • Privacy Policy
  • Contact Us

   webmaster@bsac.eecs.berkeley.edu
  User logged in as: Guest
  User Idle since: July 24, 2017, 1:34 am