Shlomo Magdassi
Small Particles, Big Scientific and
Industrial Challenges
מימדקפה והדפסות תלת , ננוחומרים
Nanomaterials: Materials may change their
properties at the Nano-size
Silver/gold nanoparticles
m.p. decreases with
size
1 nanometer = 1 millionth of a millimeter
A hair fiber : about 50,000 nm
Functional Printing and Coatings
with Nanoparticles
Displays
Emi
Transistors
Electronics
Coatings
Conductive inks
Substrates
Materials &Substrates
Solar harvesting
Fuel cell
Printed batteries
Energy
Disposable sensor
Anti-microbial
Tissue regen film
Bio - Tech
Smart packaging
Disposable sensors
Wink and decal
E-Packaging
Solar cells, thermo-solar plants, smart windows, touch-screens,
antennas, medical implants and pills ,sensors, soft robots….
Dispersing nanoparticles within liquids
Paints and Inks
Goal :to deliver functionality beyond color
Example:
Mixing black ceramic nanoparticles in liquid:
Heat resistant black coatings
Application: Thermo-Solar coating for energy
harvesting
With Prof. Mandler
Need: High T resistant Nano-absorbers
Solar paint licensed to Brightsource Energy
Spray coating large metal substrates
Power Production: 377 MW
The largest solar thermal power plant in the world,
140,000 homes served annually in California
Paint formulations are made by
same methods for making
cosmetic products
Patterning requires printing
Inkjet printing of nanoparticles
Ink-Jet Inks for glass based on
ceramic nanoparticles
GlassJet
Initial goal:
protecting the glue for
car-window from sunlight
Pigment = ceramic nanoparticles
Binder = glass nanoparticles
by DipTech
Printing glass and ceramic nanoparticles
Touch screens
Sensors
Light-emitting diodes
PCBs
E paper
Printed Electronics
Every device needs an electrical conductor
Our main objective :conductive inks
Developing materials and technologies
needed to form the electric wiring
Nanomaterials synthesis, ink formulations,
printing and sintering
Inks composed of metal nanoparticles, CNTs
Major Challenges: Achieving high Ag concentration without aggregation
High conductivity
Conductive Silver Inks
100 nm
Size and morphology control
One pot synthesis
Printed Ag NP: No Conductivity at low temp
Metal particles are separated by an insulating organic layer
A major challenge : sintering
Conductivity is obtained only after heating to high temperatures
230 ° C: Nano effect
T
Printing electrical conductors on
solar cells, by silver nanoparticles
Printing front electrodes
Printed plastic electronics ?
a cb
Discovery: Silver nanoparticles can merge at
room temperature , if particles are in close contact
Nature Communications 2014
Metal particles behave as a water droplet !
Silver NP
on Gold NP
Can we induce close packing of
nanoparticles, which would enable
coalescence within printed lines at
low T ?
Important for plastic electronics
Surface tension driven flow:
Pepper on water
Coffee spills : a rim is formed,
composed of coffee particles
Deegan , Nature
“coffee ring effect”
Making Conductive rings by “coffee ring effect”
We took silver NP instead of coffee
Each ring is conductive
Sintering at room temperature !
Making contacts :
Inkjet printing of invisible lines
made of silver rings
C-AFM
2D arrays of silver ringsTransparent Conductive Films
~ 3 um rim width
Each ring is conductive
Why do we need transparent and
conductive patterns ?
Touch screens
Displays
Light-emitting diodes
Solar cells
Smart windows
Smartphones
Connected rings as
ITO replacement for smartphones
Flexible, direct patterning, no etching
Printing IPod touch screen
Smart windows:
changing color/blocking light / IR
Nanoscale 2014
with P.S. Lee, NTU
0.94
0.56
1.00
Conductivity
relative to silver
0.007
0.002
Copper
Aluminum
1.00Silver
Cost
Prices: May 2014
Ag 620 $/Kg
Cu 7 $/Kg
Al 1.9 $/Kg
Other metals ?
Cost
relative to silver
Air
Cu inks: the oxidation challenge
Cu Cu2O & CuO
Copper NPs are unstable in air
Stable copper inks
Chemical Communications, 2015
Advanced Materials and interfaces, 2014
Next Challenge : 3D printed devices ?
What is 3D Printing?
Additive Manufacturing
Layer by Layer Printing
Y
X
Y
X
Z
Main advantages of 3D Printing
1. Bottom-up manufacturing (saving material)
2. Fabrication of complex structures
3. Additive process
Complex structures by 3D printing
(bottom-up)
Wooden bowl fabrication
(top-down)
Main Methods for 3D printing
Selective curing of photo-
sensitive monomer by UV
Selective sintering or binding
of particles in powder
Selective deposition of
melted plastic filaments
Engineering/prototyping
• Models for surgeons
• Tailored hearing-aids
• Customized implants and prosthetics
• Dentures
• Smart pills
Biomedical applications
DLP Printers
FDM Printers
Printing on 3D Structures Polyjet Multi Material
Powder Binding
Active Research Fields
Computer Science Biology
ChemistryBiomedical
Agriculture Physics
Engineering
Pharma
College of Eng.
Art (Bezalel)
3D printing of functional objects
with Prof. Banin
Dispersing QD within the monomers
to yield fluorescent objects
3D electrodes:
Silver NPs within porous structures
Printing in water :
hydrogels for artificial organs
Advanced Materials 2015
with Prof. Cohn
4D printing : moving objects with
time / T / H2O…
BioMedical applications
4D Printing: Moving Objects with Time/Temp
Soft robotics applications
Advanced Materials 2015
with Prof. Cohn
Moving jewelryby Shira Eliazar, Bezalel Academy of Art and Design
Coffee break
Printing coffee ink on coffee,
http://www.coffeeripples.com/
EU: FP6 - SelectNano, FP7 - Lotus, CoWet
Singapore NRF - CREATE
Israel Ministry of Science
Israel Ministry of Economy
HUJI: Yissum
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