Grantee Research Project Results
The Silicon Olfactory Bulb: A Neuromorphic Approach to Molecular Sensing with Chemoreceptive Neuron MOS Transistors (CnMOS)
EPA Grant Number: R830902Title: The Silicon Olfactory Bulb: A Neuromorphic Approach to Molecular Sensing with Chemoreceptive Neuron MOS Transistors (CnMOS)
Investigators: Kan, Edwin C. , Minch, Bradley A.
Current Investigators: Kan, Edwin C.
Institution: Cornell University
EPA Project Officer: Hahn, Intaek
Project Period: May 1, 2003 through April 30, 2006
Project Amount: $354,000
RFA: Environmental Futures Research in Nanoscale Science Engineering and Technology (2002) RFA Text | Recipients Lists
Research Category: Safer Chemicals , Nanotechnology
Objective:
An ideal microsensor for autonomously monitoring chemical and molecular environmental
hazards in both water and air should simultaneously have a high sensitivity,
a high selectivity, a large dynamic range, a low manufacturing cost, simple
calibration/reset protocols, a long lifetime, field reconfigurability, and low
power consumption. These requirements arise from considering the rapid deployment
and autonomous operation of a microsensor network monitoring a large area. We
have developed a Si-based neuron MOS transistor with a novel extended floating-gate
structure that permits molecular/chemical sensing. Our sensor, called a chemoreceptive
neuron MOS (CMOS) transistor, is expected to simultaneously meet all of
these requirements, and can be fabricated by minor modification or simple postprocessing
of conventional CMOS integrated circuits. The modular structure and fabrication
of this new device permits us to use CMOS devices optimized for high sensitivity
and large dynamic range and affords us complete flexibility in the design and
composition of the molecular/ chemoreceptive sites. The performance of our new
sensor is expected to be vastly superior to that of existing chemical microsensors,
such as the ion-sensitive FET (ISFET) and the CHEMFET, in nearly every important
respect resulting from the internal transistor gain and much better isolation
between the electronics and microfluidics.
Approach:
We have already established the preliminary process flow and testing of CMOS
transistors with generic molecular receptive areas for vapor and liquid sensing
(e.g., water, acetone, etc.). Our preliminary measurements have validated most
of our assumptions on the performance of these devices. In the three-year proposed
effort, we will fabricate prototype arrays of these novel microsensors with
various molecular/chemoreceptive surface coatings and characterize their sensitivities.
Surface adsorption kinetics will be studied to facilitate fast and reliable
coating selection. We will start with polymer coatings that have been used in
vapor and liquid sensors through volume expansion monitoring. We will gather
a new table of target agents and coatings from C
MOS
reading to achieve selectivity. We will also develop a micropower neuromorphic
electronic interface for such sensor arrays whose structure and function is
based on what is known about the olfactory and gustatory sensory systems of
animals. This interface, called the silicon olfactory bulb, will provide
a distilled set of informative features that can be used by a recognition system
to perform analysis and risk assessment.
Expected Results:
We expect to be able to develop a complete system, including both a sensor array and the silicon olfactory bulb, that can be fully integrated, perhaps on a single chip, and that will dissipate only a few hundred microwatts of power in total. Such devices could be manufactured in large numbers very inexpensively and deployed rapidly as environmental sensors, running autonomously for long periods of time on either solar power or miniature chemical batteries.
Publications and Presentations:
Publications have been submitted on this project: View all 23 publications for this projectJournal Articles:
Journal Articles have been submitted on this project: View all 6 journal articles for this projectSupplemental Keywords:
nanotechnology, neuron MOSFET, molecular and chemical sensors, electrochemistry, physics, engineering, water, air, monitoring, and measurement methods., RFA, Scientific Discipline, Air, Ecosystem Protection/Environmental Exposure & Risk, Sustainable Industry/Business, Chemical Engineering, Environmental Chemistry, Monitoring/Modeling, Analytical Chemistry, Environmental Monitoring, New/Innovative technologies, Chemistry and Materials Science, Engineering, Chemistry, & Physics, Environmental Engineering, environmental measurement, microsensors, air pollution control, nanotechnology, chemoreceptive neuron transistors, air pollution, environmental contaminants, chemoreceptive neuron transitors, aerosol analyzers, silicon olfactory bulbProgress and Final Reports:
The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.