passivation of carbon nanotube chips for biosensing applications n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Passivation of Carbon Nanotube Chips for Biosensing Applications PowerPoint Presentation
Download Presentation
Passivation of Carbon Nanotube Chips for Biosensing Applications

Loading in 2 Seconds...

play fullscreen
1 / 15

Passivation of Carbon Nanotube Chips for Biosensing Applications - PowerPoint PPT Presentation


  • 67 Views
  • Uploaded on

Passivation of Carbon Nanotube Chips for Biosensing Applications. By: Vince Nguyen Faculty Mentor: Dr. Phillip Collins Lab Mentor: Dr. Jaan Mannik. IMSURE PROGRAM. What is Passivation?. According to www.dictionary.com

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Passivation of Carbon Nanotube Chips for Biosensing Applications' - merrill-bean


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
passivation of carbon nanotube chips for biosensing applications

Passivation of Carbon Nanotube Chips for Biosensing Applications

By: Vince Nguyen

Faculty Mentor: Dr. Phillip Collins

Lab Mentor: Dr. Jaan Mannik

IMSURE PROGRAM

what is passivation
What is Passivation?

According to www.dictionary.com

-To treat or coat (a metal) in order to reduce the chemical reactivity of its surface.

-To coat (a semiconductor) with an oxide layer to protect against contamination and increase electrical stability.

Why Research Passivating CNTS Chips?

  • Contribute knowledge to understand more about nanoelectronics.
  • Gain experience in a more technical laboratory work by working with others.
  • Future contribution to biochemistry, chemistry, and physics.
introduction to carbon nanotubes cnts
Introduction to Carbon Nanotubes (CNTS)
  • Extremely small tubes.
  • A few nanometers wide.
  • Length >>>>>> Width.
  • Cylindrical carbon molecules with properties that is potentially useful.
  • sp2 bonds; stronger than sp3 bonds in diamond.
  • All atoms are on the surface of single-walled nanotubes.

www.abb.com/global/ abbzh/abbzh254.nsf/0/1474d...

http://www.nano-lab.com/image5.html

www.fujixerox.co.jp/.../ inbt/m_electronics/

big picture of current research
Big Picture of Current Research
  • Minimize the amount of electrochemical reactions to accurately do electrical measurements on CNTS chips.
  • Detect if biomolecules actually bind to CNTS in electrolyte solutions.
  • Current scientific/medical companies successfully create H2(g) sensor using CNTS for patients with breathing problem; they are considering of creating CO2(g) sensor as well.
how do biomolecules bind to cnts
How do Biomolecules Bind to CNTS

www.jcnabity.com/ nanotube.htm

pubs.acs.org/cen/topstory/ 7919/7919notw9.html

experimental methods
Experimental Methods

Silicon oxide device (clean and uncovered)

Silicon oxide device (covered with polymer)

Remove of exposed area using mixed solvents

Scanning electron microscope (SEM)

sem s contribution to research
SEM’s Contribution to Research
  • Allow successful creations of big windows.
  • Allow verification of big windows to see if they are successfully removed (observation).
  • Work with NORAN System SIX to allow successful creations of line windows.
  • Allow verification of line windows to see if they are successfully removed (observation).
  • Spot size mode in SEM is the command that contribute a lot to line window’s creations.
limitations of our sem
Limitations of Our SEM
  • Higher magnification causes polymer’s exposed area to burn.
  • Scan 1 mode’s scanning box can’t be minimize for smaller window’s creations.
  • Measurement of beam current is quite complex.
  • SEM system does not have a built-in command to automatically scan the area of interest on silicon oxide chips at an exact amount of time that we want.
  • Using SEM to do passivation requires quick and fast hand movement to minimize the amount of exposure of beam current on unwanted area.
results
Results

Device III

M = X 2500

ss = 25

t = 2.5 minutes

Length = 13.92 microns

Width = .64 micron

N = 15, t = 4 seconds

M = X 2500

ss = 3

n = 1.1 points/micron

M = Magnification

ss = Spotsize

AcV = Accelerating Voltage = 10 kV (Constant)

N = # of points per scan

t = total time per scan

WD = working distance = 10 mm (Constant)

n = points scan per unit length

continue
Continue…

Device 2

Device 4

ss = 4, M = X 3000

N = 40, t = 11 seconds

Length = 28.67 microns

Width = 1.33 microns

ss = 1

M = X 3000

n ranges from 1.1 to 1.4 points per micron in length

verification of results
Verification of Results

Before Passivation

After Passivation

Device I

continue1
Continue…

Before Passivation

After Passivation

Device III

future research
Future Research
  • May explain why strange dots exist when creating line windows.
  • May create even smaller windows if measured interference is found to be unacceptable.
acknowledgements
Acknowledgements

I would like to thank…

My Mentor: Dr. Phillip Collins

My Lab Mentor: Dr. Jaan Mannik

Researchers in Lab: Brett Goldsmith,

Dr. Yuwei Fan, Alex Kane, and Derek

Kingrey

IM-MURE Program

UC Irvine

Coordinator: Said Shokair