3 research outputs found
Hierarchical Wrinkles with Piezopotential Enhanced Surface Tribopolarity for High-Performance Self-Powered Pressure Sensor
Achieving
both high sensitivity and wide detecting range is significant
for the applications of triboelectric nanogenerator-based self-powered
pressure sensors (TPSs). However, most of the previous designs with
high sensitivity usually struggle in a narrow pressure detection range
(<30 kPa) while expanding the detection range normally sacrifices
the sensitivity. To overcome this well-known obstacle, herein, piezopotential
enhanced triboelectric effect realized by a rationally designed PDMS/ZnO
NWs hierarchical wrinkle structure was exploited to develop a TPS
(PETPS) with both high sensitivity and wide detecting range. In this
PETPS design, the piezopotential derived from the deformation of ZnO
NWs enhances its tribo-charge transferring ability; meanwhile, the
hierarchical structure helps to establish a dynamically self-adjustable
contact area. Benefiting from these advantages, the PETPS simultaneously
achieves high sensitivity (0.26 nC cm–2 kPa–1 from 1 to 25 kPa, and 0.02 nC cm–2 kPa–1 from 25 to 476 kPa), fast response (46 ms),
wide sensing range (1 to 476 kPa), and good stability (over 4000 cycles).
In addition, the output charge density that is independent of the
speed rate of driven force was adopted as the sensing signal of PETPS
to replace the commonly used peak voltage/current values, enabling
it more adaptive to accurately detect pressure variation in real applications
Hierarchical Wrinkles with Piezopotential Enhanced Surface Tribopolarity for High-Performance Self-Powered Pressure Sensor
Achieving
both high sensitivity and wide detecting range is significant
for the applications of triboelectric nanogenerator-based self-powered
pressure sensors (TPSs). However, most of the previous designs with
high sensitivity usually struggle in a narrow pressure detection range
(<30 kPa) while expanding the detection range normally sacrifices
the sensitivity. To overcome this well-known obstacle, herein, piezopotential
enhanced triboelectric effect realized by a rationally designed PDMS/ZnO
NWs hierarchical wrinkle structure was exploited to develop a TPS
(PETPS) with both high sensitivity and wide detecting range. In this
PETPS design, the piezopotential derived from the deformation of ZnO
NWs enhances its tribo-charge transferring ability; meanwhile, the
hierarchical structure helps to establish a dynamically self-adjustable
contact area. Benefiting from these advantages, the PETPS simultaneously
achieves high sensitivity (0.26 nC cm–2 kPa–1 from 1 to 25 kPa, and 0.02 nC cm–2 kPa–1 from 25 to 476 kPa), fast response (46 ms),
wide sensing range (1 to 476 kPa), and good stability (over 4000 cycles).
In addition, the output charge density that is independent of the
speed rate of driven force was adopted as the sensing signal of PETPS
to replace the commonly used peak voltage/current values, enabling
it more adaptive to accurately detect pressure variation in real applications
Self-Powered Microfluidic Transport System Based on Triboelectric Nanogenerator and Electrowetting Technique
Electrowetting
technique is an actuation method for manipulating
position and velocity of fluids in the microchannels. By combining
electrowetting technique and a freestanding mode triboelectric nanogenerator
(TENG), we have designed a self-powered microfluidic transport system.
In this system, a mini vehicle is fabricated by using four droplets
to carry a pallet (6 mm × 8 mm), and it can transport some tiny
object on the track electrodes under the drive of TENG. The motion
of TENG can provide both driving power and control signal for the
mini vehicle. The maximum load for this mini vehicle is 500 mg, and
its highest controllable velocity can reach 1 m/s. Freestanding TENG
has shown excellent capability to manipulate microfluid. Under the
drive of TENG, the minimum volume of the droplet can reach 70–80
nL, while the tiny droplet can freely move on both horizontal and
vertical planes. Finally, another strategy for delivering nanoparticles
to the designated position has also been demonstrated. This proposed
self-powered transport technique may have great applications in the
field of microsolid/liquid manipulators, drug delivery systems, microrobotics,
and human-machine interactions