This document discusses flexible ferroelectret nano generators (FENG) as an alternative energy source. It describes FENG as a thin film device that generates power when folded by utilizing ferroelectric properties. The document outlines the need for renewable energy sources, introduces different types of nano generators including piezoelectric and triboelectric types, and describes the fabrication, functions, applications and conclusions regarding FENG as a promising mechanical energy harvesting technology.

1. Presented by,
s.Gobiga rani,
Electronics and communication engineering,
SBM college of engineering and technology,
Dindigul.

2. Contents:
 Need for alternative energy sources
 Nano generators
 Types of Nano generators
 What is FENG?
 Fabrication of FENG
 Functions of FENG
 Upcoming devices based on FENG
 Applications
 Conclusion

3. Need for alternative energy
sources:
 We mostly depend on Coal, Oil and natural
gas for our energy needs.
 Fossil fuel are non renewable.
 CO₂ released causes global warming.
 Damages water system.
 Renewable power installed capacity is 28%.
 Non renewable power installed capacity is
72%.
 Contribution from natural gas, oil and hydro
plants has decreased in last four years (2012-
2016).

4. Nano generators:
 Small electronic chip.
 Uses mechanical movements/thermal
energy to generate electricity.
 Made up of piezoelectric ceramic material
and silicon.
 As the name implies, it is extremely small
in size.
 Generators is about 2 mm in diameter.

5. Types of Nano generators:
 Piezo electric Nano generator
 Tribo electric Nano generator
 Pyro electric Nano generator

6. What is FENG?
 FENG is a Nanogenerator, it is a
thin film like a flexible device that
when folded, creates the power
 Project Lead and Associate
Professor of Electrical and
Computer Engineering Nelson
Sepulveda research team at
Michigan state university found
this FENG
 By utilizing repeated non-
strenuous tapping and pressing
movements, the research team
was able to successfully operate
a 20 LED light bank, LCD display
and soft keyboard all without a
battery
FENG-Ferro Electret Nano Generator

7. Fabrication of FENG:
 PPFE(Polypropylene Ferro electret)
plays an important role in the fabrication
of FENG
 Polypropylene (PP) foams are good
thermal insulators with a
high mechanical strength-to-weight ratio

8.  PPFE film fabricated with a
nominal thickness of 80 μm
and Piezo electric coefficient
d33∼400 pC/N serve as a
insulator
 Two thin silver films
sputtered on the both sides
of the PPFE act as a
electrodes
 Copper wires are fixed on
the electrodes by using
conductive paint and copper
tape providing electrical
terminals that allows the
external circuitry connection
to the FENG

9. Functions of FENG:
 PP film containing tiny foreign inorganic
particles
 When it experiences stretching in two
perpendicular directions ,the inorganic
particles serve as a stress concentrator
resulting in lens shaped voids
 During this process ,high pressure NO2
or CO2 diffuse into the film which is full
of voids.

10.  Subsequently ,the external
gas pressure is suddenly
released, resulting in
dramatically swell of those
voids in PP film.
 polarization will takes place
at there.
 The change of dipole
moments is capable of
driving the electrons from
the electrode with negative
charge to the electrode with
+ve charge ,generating a
difference in potential
between the electrodes
 That is flow of charge from
one electrode to another
 Hence, the internal pressure
with in the voids becomes
equal to the external pressure

11. Upcoming devices based on
FENG:
 Researchers
used Nano
generators to allow
touchscreens to
generate power using
the force of a standard
swipe, which might
add the human hand
to the list of renewable
resources utilized in
the Fourth Industrial
Revolution.

12.  The researchers
used the FENG to
successfully operate
an LCD touch
screen, an array of
20 LED lights, and a
flexible keyboard, all
without using a
battery; merely
touching the screen
was enough to give
it power.

13.  By Using FENG at
the shoes ,it
produces more
power which is not
affected the
environment and it
does not produce
any hindrance to the
human health

14. Applications:

15. Conclusion:
 In summary, FENG is a new type of energy
harvesting method that takes advantage of
ferroelectric phenomenon
 Based on PPFE, the fabrication of lightweight,
flexible, foldable, and biocompatible thin film
FENG which is able to be power source for
commercial electronics is possible
 Advantages such as lightweight, flexible,
foldable, biocompatible, scalable, and low cost
and robustness could make FENG a promising
and alternative method in the field of
mechanical energy harvesting for various of
autonomous electronics.