Using chemically reduced graphene inks for printed electronics
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Received the Best Poster Award at the Materials Science Department, Cambridge University. Talks about research on using chemically reduced graphene inks for Printed Electronics applications. It addresses the science and business aspects of this emerging material.
![• Thinnest material in the Universe
• 2D array of carbon atoms
• Zero band gap
• Abundant delocalised electrons enable
outstanding conductivity
Using chemically reduced graphene inks for printed electronics
Vishnu Chundi Dr. Di Wei
MPhil student, vtc20@cam.ac.uk Supervisor, Nokia Research Centre
Graphene’s excellent conductivity can
be exploited for printing electronics
Chemically reduce graphite oxide
(GO) to produce graphene ink
Chemical reduction of GO to graphene offers
optimum electronic quality at lowest cost
Simple three step process
• Graphite is oxidized to Graphite oxide
• GO is dispersed in water and separates into
layers of individual graphene oxide sheets
• Reduce using hydrazine to obtain graphene
Benefits of chemical reduction
• Surface tension and viscoelasticity of graphene
ink can be tuned in dispersion
• Low cost/ mass production
method=>commercially practical
Fig.1. Graphene: single layer of sp2 carb0ns [1]
Graphene inks outperform both
organic/metallic inks
• Cheaper and more conductive than silver ink
• Does not form insulating oxide film like Cu
• Very flexible, robust and crease resistant
• Completely non-toxic and strong dispersability
unlike CNT ink
• No need of sintering graphene ink after
printing=>Can be used to print on plastic and
paper substrates
Fig.3. Graphene inks lose very little
conductivity when folded[2]
Fig.2. Handheld Flexo printing unit
Graphene inks are compatible with
current printing technologies
Have been printed with all existing printing
techniques:
• Screen
• Gravure
• Flexographic
• Inkjet
Examples of key applications
RFID tag
on paper
OLED
display
Photovoltaic
cell
Global printed electronic market is
expected to grow rapidly
Full potential of graphene
Graphene’s potential is not restricted to ink alone.
• Substitute for ITO in flexible displays and touch
screens (high transparency)
• Outstanding candidate for electrode material in
supercapacitors (large surface area)
• Can also be used in solar cells, batteries and
composite materials
Future work
Experimental: Optimize graphene inks for
Flexo and Screen printing by surface modification
to get best results on metal foil , plastic substrate
Business: Survey of printing tech companies
from Cambridge to global vendors; Evaluate
technical and economic possibilities for graphene
inks in near future
References
1. Taghioskoui, M. Materials Today. (2009) 12, 34
2. Monie, S. Industrial Specialty Printing. (2010)
3. Das, R. IDTechEx-Printed, Organic & Flexible
Electronics Forecasts.(2010)](https://image.slidesharecdn.com/vishnuchundiposter-150515161035-lva1-app6891/85/Using-chemically-reduced-graphene-inks-for-printed-electronics-1-320.jpg?cb=1431706479)
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Using chemically reduced graphene inks for printed electronics
- 1. • Thinnest material in the Universe • 2D array of carbon atoms • Zero band gap • Abundant delocalised electrons enable outstanding conductivity Using chemically reduced graphene inks for printed electronics Vishnu Chundi Dr. Di Wei MPhil student, vtc20@cam.ac.uk Supervisor, Nokia Research Centre Graphene’s excellent conductivity can be exploited for printing electronics Chemically reduce graphite oxide (GO) to produce graphene ink Chemical reduction of GO to graphene offers optimum electronic quality at lowest cost Simple three step process • Graphite is oxidized to Graphite oxide • GO is dispersed in water and separates into layers of individual graphene oxide sheets • Reduce using hydrazine to obtain graphene Benefits of chemical reduction • Surface tension and viscoelasticity of graphene ink can be tuned in dispersion • Low cost/ mass production method=>commercially practical Fig.1. Graphene: single layer of sp2 carb0ns [1] Graphene inks outperform both organic/metallic inks • Cheaper and more conductive than silver ink • Does not form insulating oxide film like Cu • Very flexible, robust and crease resistant • Completely non-toxic and strong dispersability unlike CNT ink • No need of sintering graphene ink after printing=>Can be used to print on plastic and paper substrates Fig.3. Graphene inks lose very little conductivity when folded[2] Fig.2. Handheld Flexo printing unit Graphene inks are compatible with current printing technologies Have been printed with all existing printing techniques: • Screen • Gravure • Flexographic • Inkjet Examples of key applications RFID tag on paper OLED display Photovoltaic cell Global printed electronic market is expected to grow rapidly Full potential of graphene Graphene’s potential is not restricted to ink alone. • Substitute for ITO in flexible displays and touch screens (high transparency) • Outstanding candidate for electrode material in supercapacitors (large surface area) • Can also be used in solar cells, batteries and composite materials Future work Experimental: Optimize graphene inks for Flexo and Screen printing by surface modification to get best results on metal foil , plastic substrate Business: Survey of printing tech companies from Cambridge to global vendors; Evaluate technical and economic possibilities for graphene inks in near future References 1. Taghioskoui, M. Materials Today. (2009) 12, 34 2. Monie, S. Industrial Specialty Printing. (2010) 3. Das, R. IDTechEx-Printed, Organic & Flexible Electronics Forecasts.(2010)