This presentation discusses quantum tunnelling composites (QTC). QTCs are composite materials made of metals and non-conducting binders that can act as pressure sensors. The presentation covers how QTCs work using the quantum mechanical phenomenon of quantum tunnelling, where particles can pass through barriers they normally could not. It then discusses applications of QTCs in touchscreens, robotics, gaming, and power tools. Benefits of QTCs include being contactless switches, pressure sensing materials, and customizable for different requirements. Future prospects discussed include uses in smart fabrics, clothing controls, and operating devices through pressure.

1. DIGITAL ELECTRONICS
Presentation on
QUANTUM TUNNELLING
COMPOSITE(QTC)
Section : C
Supervisor : Rethwan Faiz

2. Presented by
Mahbub Murshed
Fahim Foysal
Imtiaz Ur Rahman Khan
Rifat Hossain Khan
Maksudur Rahman
15-30211-2
15-30231-2
15-29626-2
15-30189-2
15-30195-2

3. Topics
What is QTC?
Working Process of a QTC
QTC applications
Benefits of using QTC
Future prospects

4. What is Quantum Tunnelling
Quantum tunnelling is the quantum
mechanical phenomenon where a particle tunnels
through a barrier that it classically could not
surmount.
Fundamental quantum mechanical concepts are
central to this phenomenon, which makes quantum
tunnelling one of the novel implications of quantum
mechanics

5. What is Composite
An Engineered material made from two or
more constituents with significally different
physical or chemical properties.
What is QTC
Quantum tunnelling composites are composite
materials of metals and non-
conducting elastomeric binder, used as pressure
sensors.

6. History Of QTC
Developed from the study of Radioactivity.
First used to explain alpha decay of heavier
elements in 1928 by George Gamow.
Leo Esaki, Ivar Giaever and Brian
Josephson predicted the tunnelling
of superconducting Cooper pairs, for which they
received the Nobel Prize in Physics in 1973.

7. How does it look
 QTC usually comes in the form of pills or sheet
 QTC pills are magnetic too. Nothing like having some
magnets laying around on the table while you work.

8. Quantum tunneling
composite (QTC)
working process
How does it work?

9. QTC working process
Pressure on QTC pill : QTC Switch :

10. Quantum tunneling
• A QTC in its normal state is a perfect
insulator.
• When compressed it becomes a perfect
conductor
• If only lightly compressed its conductivity is
proportional to the pressure applied.
In normal physics an electron cannot
pass through an insulation barrier . In
Quantum physics theory a wave of
electrons can pass through an
insulator –this is what is happening.

11. Scanning probe microscopy

12. Applications of
Quantum Tunneling
Composite

13. QTC Applications
Smartphone
Touchscreens – QTC is
increasingly being used
in smartphones for
extended functionality,
e.g most popularly in
3D touch for iPhones.

14. QTC Applications
Robotics – Used in
prosthetic limbs to
accurately
determine the
pressure being
applied by the
limbs.

15. QTC Applications
Gaming – QTC is beginning to be used
extensively in game controllers and
computer mice to give greater control.
Electric tools – Used in the handles of
electric tools. Mainly used as a variable
controller and power switches.

16. Benefit of QTC

17. Benefits are-
 OTC material is a contactless switch, ideal for spark free operation.
 It is a pressure sensing material.
 It is so simple to use in electronic and electrical devices.
 It’s rang and sensitivity can be altered.
 It can be customized for customer requirements, applications and
products.
 It can stand in extreme temperature limit.
 Mechanically strong and it has no moving parts to wear out.

18. Future Prospects

19. Future Prospects
Embedded Fabric Control
Smart Tex

20. Operating mirrors doors and windows

21. QTC in Textile
Wearable applications
mp3 player controller
Easy control of device
Pressure controlled
conductive surface
Switching

22. Sources
 http://www.patentlyapple.com/patently-apple/2017/02/apple-patent-reveals-breakthrough-
quantum-tunneling-touch-sensitive-materials-for-iphone-smart-cases-more.html Easy
control of device
 http://www.mechanicalengineeringblog.com/2045-quantum-tunnelling-composite-qtc-a-
pressure-switching-and-sensing-material-technology-electro-mechanics-
components/#.WpGzBmpuaUk Switching
 https://www.peratech.com/what-is-qtc.html
 http://www.mechanicalengineeringblog.com/tag/quantum-tunnelling-composite-
uses/#.WpGyyWpuaUk
 https://en.wikipedia.org/wiki/Quantum_tunnelling_composite
 http://nextgenlog.blogspot.com/2011/08/quantum-tunneling-enables-3d-touch.html

23. Thank You!!!