Tech Briefs Magazine - May 2022 - 39

Graphene Made with Lasers for Wearable Health Devices
Graphene could advance flexible electronics for tactile sensing devices.
The Pennsylvania State University, University Park, PA
G
raphene - hexagonally arranged
carbon atoms in a single layer with
superior pliability and high conductivity
- could impact the development of
future motion detection, tactile sensing,
and health monitoring devices.
Several substances can be converted
into carbon to create graphene through
laser radiation. Called laser-induced
graphene (LIG), the resulting product
can have specific properties determined
by the original material. Samples of polyimide,
a type of plastic, were irradiated
through laser scanning. Researchers varied
the power, scanning speed, number
of passes, and density of scanning lines
to see how different parameters of the
laser processing process create different
nanostructures.
The researchers found that lower
power levels, from 7.2 watts to roughly
9 watts, resulted in the formation of
a porous foam with many ultrafine layers.
This LIG foam exhibited electrical
conductivity and a fair resistance to heat
damage - both properties that are useful
in components of electronic devices.
Increasing the power from approximately
9 watts to 12.6 watts changed the
LIG formation pattern from foam to
bundles of small fibers. These bundles
grew larger in diameter with increased
laser power, while higher power promoted
the web-like growth of a fiber
network. The fibrous structure showed
better electrical conductivity than the
foam. This increased performance,
combined with the fiber's form, could
open possibilities for sensing devices.
As long as the fiber is conductive, it can
be used as a scaffold; subsequent modifications
on the surface could enable
a number of sensors such as a glucose
sensor on the skin or an infection detector
for wounds.
Varying the laser scanning speed,
density, and passes for the LIG formed
at different powers also influenced conductivity
and subsequent performance.
More laser exposure resulted in higher
conductivity but eventually dropped due
to excess carbonization from burning.
TB Specialty Coating Systems Ad 0522.qxp_1/2 Page Island 4/13/22 3:56 PM Page 1
Flexible graphene devices can be made with lasers,
like the wearable pressure sensor shown
here. (Photo: Huanyu Cheng)
Tech Briefs, May 2022
Free Info at http://info.hotims.com/82321-727
39
TB Materials Coatings 0522_1.indd 39
Cov
ToC
4/19/22 8:25 AM
http://info.hotims.com/82321-727 http://info.hotims.com/82321-727 http://info.hotims.com/82321-809

Tech Briefs Magazine - May 2022

Table of Contents for the Digital Edition of Tech Briefs Magazine - May 2022

Tech Briefs Magazine - May 2022 - Intro
Tech Briefs Magazine - May 2022 - Sponsor
Tech Briefs Magazine - May 2022 - Cov1
Tech Briefs Magazine - May 2022 - Cov2
Tech Briefs Magazine - May 2022 - 1
Tech Briefs Magazine - May 2022 - 2
Tech Briefs Magazine - May 2022 - 3
Tech Briefs Magazine - May 2022 - 4
Tech Briefs Magazine - May 2022 - 5
Tech Briefs Magazine - May 2022 - 6
Tech Briefs Magazine - May 2022 - 7
Tech Briefs Magazine - May 2022 - 8
Tech Briefs Magazine - May 2022 - 9
Tech Briefs Magazine - May 2022 - 10
Tech Briefs Magazine - May 2022 - 11
Tech Briefs Magazine - May 2022 - 12
Tech Briefs Magazine - May 2022 - 13
Tech Briefs Magazine - May 2022 - 14
Tech Briefs Magazine - May 2022 - 15
Tech Briefs Magazine - May 2022 - 16
Tech Briefs Magazine - May 2022 - 17
Tech Briefs Magazine - May 2022 - 18
Tech Briefs Magazine - May 2022 - 19
Tech Briefs Magazine - May 2022 - 20
Tech Briefs Magazine - May 2022 - 21
Tech Briefs Magazine - May 2022 - 22
Tech Briefs Magazine - May 2022 - 23
Tech Briefs Magazine - May 2022 - 24
Tech Briefs Magazine - May 2022 - 25
Tech Briefs Magazine - May 2022 - 26
Tech Briefs Magazine - May 2022 - 27
Tech Briefs Magazine - May 2022 - 28
Tech Briefs Magazine - May 2022 - 29
Tech Briefs Magazine - May 2022 - 30
Tech Briefs Magazine - May 2022 - 31
Tech Briefs Magazine - May 2022 - 32
Tech Briefs Magazine - May 2022 - 33
Tech Briefs Magazine - May 2022 - 34
Tech Briefs Magazine - May 2022 - 35
Tech Briefs Magazine - May 2022 - 36
Tech Briefs Magazine - May 2022 - 37
Tech Briefs Magazine - May 2022 - 38
Tech Briefs Magazine - May 2022 - 39
Tech Briefs Magazine - May 2022 - 40
Tech Briefs Magazine - May 2022 - 41
Tech Briefs Magazine - May 2022 - 42
Tech Briefs Magazine - May 2022 - 43
Tech Briefs Magazine - May 2022 - 44
Tech Briefs Magazine - May 2022 - 45
Tech Briefs Magazine - May 2022 - 46
Tech Briefs Magazine - May 2022 - 47
Tech Briefs Magazine - May 2022 - 48
Tech Briefs Magazine - May 2022 - 49
Tech Briefs Magazine - May 2022 - 50
Tech Briefs Magazine - May 2022 - 51
Tech Briefs Magazine - May 2022 - 52
Tech Briefs Magazine - May 2022 - 53
Tech Briefs Magazine - May 2022 - 54
Tech Briefs Magazine - May 2022 - 55
Tech Briefs Magazine - May 2022 - 56
Tech Briefs Magazine - May 2022 - 57
Tech Briefs Magazine - May 2022 - 58
Tech Briefs Magazine - May 2022 - 59
Tech Briefs Magazine - May 2022 - 60
Tech Briefs Magazine - May 2022 - Cov3
Tech Briefs Magazine - May 2022 - Cov4
Tech Briefs Magazine - May 2022 - PIT-Cov1
Tech Briefs Magazine - May 2022 - PIT-Cov2
Tech Briefs Magazine - May 2022 - PIT-1
Tech Briefs Magazine - May 2022 - PIT-2
Tech Briefs Magazine - May 2022 - PIT-3
Tech Briefs Magazine - May 2022 - PIT-4
Tech Briefs Magazine - May 2022 - PIT-5
Tech Briefs Magazine - May 2022 - PIT-6
Tech Briefs Magazine - May 2022 - PIT-7
Tech Briefs Magazine - May 2022 - PIT-8
Tech Briefs Magazine - May 2022 - PIT-9
Tech Briefs Magazine - May 2022 - PIT-10
Tech Briefs Magazine - May 2022 - PIT-11
Tech Briefs Magazine - May 2022 - PIT-12
Tech Briefs Magazine - May 2022 - PIT-13
Tech Briefs Magazine - May 2022 - PIT-14
Tech Briefs Magazine - May 2022 - PIT-15
Tech Briefs Magazine - May 2022 - PIT-16
Tech Briefs Magazine - May 2022 - PIT-17
Tech Briefs Magazine - May 2022 - PIT-18
Tech Briefs Magazine - May 2022 - PIT-19
Tech Briefs Magazine - May 2022 - PIT-20
Tech Briefs Magazine - May 2022 - PIT-21
Tech Briefs Magazine - May 2022 - PIT-22
Tech Briefs Magazine - May 2022 - PIT-23
Tech Briefs Magazine - May 2022 - PIT-24
Tech Briefs Magazine - May 2022 - PIT-25
Tech Briefs Magazine - May 2022 - PIT-26
Tech Briefs Magazine - May 2022 - PIT-27
Tech Briefs Magazine - May 2022 - PIT-28
Tech Briefs Magazine - May 2022 - PIT-Cov3
Tech Briefs Magazine - May 2022 - PIT-Cov4
Tech Briefs Magazine - May 2022 - BET-Cov1a
Tech Briefs Magazine - May 2022 - BET-Cov1b
Tech Briefs Magazine - May 2022 - BET-Cov1
Tech Briefs Magazine - May 2022 - BET-Cov2
Tech Briefs Magazine - May 2022 - BET-1
Tech Briefs Magazine - May 2022 - BET-2
Tech Briefs Magazine - May 2022 - BET-3
Tech Briefs Magazine - May 2022 - BET-4
Tech Briefs Magazine - May 2022 - BET-5
Tech Briefs Magazine - May 2022 - BET-6
Tech Briefs Magazine - May 2022 - BET-7
Tech Briefs Magazine - May 2022 - BET-8
Tech Briefs Magazine - May 2022 - BET-9
Tech Briefs Magazine - May 2022 - BET-10
Tech Briefs Magazine - May 2022 - BET-11
Tech Briefs Magazine - May 2022 - BET-12
Tech Briefs Magazine - May 2022 - BET-13
Tech Briefs Magazine - May 2022 - BET-14
Tech Briefs Magazine - May 2022 - BET-15
Tech Briefs Magazine - May 2022 - BET-16
Tech Briefs Magazine - May 2022 - BET-17
Tech Briefs Magazine - May 2022 - BET-18
Tech Briefs Magazine - May 2022 - BET-19
Tech Briefs Magazine - May 2022 - BET-20
Tech Briefs Magazine - May 2022 - BET-21
Tech Briefs Magazine - May 2022 - BET-22
Tech Briefs Magazine - May 2022 - BET-23
Tech Briefs Magazine - May 2022 - BET-24
Tech Briefs Magazine - May 2022 - BET-25
Tech Briefs Magazine - May 2022 - BET-26
Tech Briefs Magazine - May 2022 - BET-27
Tech Briefs Magazine - May 2022 - BET-Cov3
https://www.nxtbook.com/smg/techbriefs/22TB08
https://www.nxtbook.com/smg/techbriefs/22TB07
https://www.nxtbook.com/smg/techbriefs/22TB06
https://www.nxtbook.com/smg/techbriefs/22TB05-P
https://www.nxtbook.com/smg/techbriefs/22TB05-D
https://www.nxtbook.com/smg/techbriefs/22TB04
https://www.nxtbook.com/smg/techbriefs/22TB03
https://www.nxtbook.com/smg/techbriefs/22TB02
https://www.nxtbook.com/smg/techbriefs/22TB01
https://www.nxtbook.com/smg/techbriefs/21TB12
https://www.nxtbook.com/smg/techbriefs/21TB11
https://www.nxtbook.com/smg/techbriefs/21TB10
https://www.nxtbook.com/smg/techbriefs/21TB09
https://www.nxtbook.com/smg/techbriefs/21TB08
https://www.nxtbook.com/smg/techbriefs/21TB07
https://www.nxtbook.com/smg/techbriefs/21TB06
https://www.nxtbook.com/smg/techbriefs/21TB05
https://www.nxtbook.com/smg/techbriefs/21TB04
https://www.nxtbook.com/smg/techbriefs/21BT03
https://www.nxtbook.com/smg/techbriefs/21TB02
https://www.nxtbookmedia.com