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The development of a nanocomposite conductive ink for fabrication of inkjet-printed biosensor and applications

ink, biosensor, nanocomposite, analytic electrochemistry
by

Simon Nussbaumer

on 3 September 2013

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Transcript of The development of a nanocomposite conductive ink for fabrication of inkjet-printed biosensor and applications

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Low cost
Inkjet printing
Physical properties of fluid
Requirements for printability
The development of a nanocomposite conductive ink
for fabrication of inkjet-printed biosensor and applications

Simon Nussbaumer EPFL
Summary
Theory
Inkjet printing
Ink requirement
Graphene
Results
Filtration
Viscosity
Surface tension
Z
Accurate amount of material deposition
waste efficient
big surface patterning
Domain of application
Conducting Polymers
Polymer light emiting diode (PLED)
3D ceramic printing
Sol-Gel Materials
Structural Polymers
Organic Transistors
Nanoparticles
Metals
Nucleic Acid and Protein Arrays
Key technology in functional material deposition
Viscosity :
Surface tension :
Density :
Radius of nozzle :
Average velocity :
Adimensional numbers
Printable range
Dimatix requirements
Viscosity: 10-12 centipoise
Surface Tension: 28-42 dynes/cm
High boiling point >100°C
Density>1
Filtration: 0.2 um
Results
Filtration
Solution:
cross flow filtration, prevention of gel layer at the filter surface
Viscosity
Temperature dependance
Thickening agent
Newtonian vs Non Newtonian
Surface tension
Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force.
Gelling effect of Polyaniline :
Negative effects of thickening agents:
Hard to remove after printing
Decrease conductivity
Destabilize suspension
Tendency to aggregation and clogging
Z
Path forward
Printing parameters
Biosensor application
Graphene
2D building block for sp2 carbon allotropesHigh interest in research Excellent electrical, mechanical,
and thermal propertiesLow costHigh conductivity
Use:
nanomechanical systems,thin-film transistors, transparent or conductivecomposites, electrodes, andphotonics
Path forward
Printing parameters
Biosensor application
Variables
Temperature (cartridge & substrate)
Waveform
Cleaning cycle
Drop spacing
Multiple layers
Voltage
Frequency
Distance between nozzles and substrate
Drying temperature & time
Observables
Stability
Resolution
Surface
Coffee ring effect
Total antioxydant measurement
Observables
Conductivity
Sensivity
Selectivity
Reproducibility
Other coating method
Thank you for your attention!
Questions ?
Jetting
Ink from cartridge to nozzle
-gravitational forces
-pressure wave (piezo)
-voltage & frequency
-waveform
- vary size and speed of
jetting
Full transcript