flexible heat-flow sensing sheets based on the longitudinal spin seebeck effect using one-dimensional spin-current conducting films - flexible plastic sheet
Flow sensing is expected to become an important part of intelligent thermal management in the future.
Usually, thermoelectric (TE)
The conversion technology based on the Seebeck effect has been used to measure the heat flow by converting the flow into voltage.
However, for the ubiquitous heat
Flow visualization with extremely low thermal resistance, thin and flexible sensors are highly needed.
Recently, another TE effect, the longitudinal spin Seebeck effect (LSSE)
, Has aroused great interest, as LSSE may provide favorable functions for TE applications such as simple thin
Structure of thin film devices.
Here we show an LSSE-
Flexible TE-based plates especially suitable for heating
Flow sensing applications.
This TE table contains a ni0. 2Zn0. 3Fe2.
5oo4 film formed on flexible plastic sheet using spray-
The coating method known as "iron plating.
The experimental results show that iron
Plated film with cylindrical crystal structure arranged perpendicular to the film plane is a unique film
Three dimensional spin
Current conductor suitable for bending LSSE-based sensors.
This newly developed thin TE sheet can be attached to a heat source of different shapes without hindering the inherent heat flow, paving the way for a multi-functional heat source
Traffic measurement and management.
In order to prepare NiZnFeO film for TE sheet by ferrite plating method, we first installed 25-μm-
On the thick pi substrate on the rotating stage, then spray the aqueous solution (
And an oxidation agent (NaNOu2009+u2009CHCOONH)
As shown, from the two nozzles placed above the stage.
This setup enables us to grow ferrite body films by alternating adsorption and oxidation of component materials (
Including Fe, Ni and Zn).
During this process, the temperature of the stage is maintained at about 90 °c.
The thickness of the NiZnFeO film is controlled by the time period of the formation process.
Analysis of the composition of ferrite film by inductive coupled plasma (ICPS).
The Pt film was deposited on the top of the NiZnFeO film by a magnetic sputtering system.
Prior to the sputtering process, the sample was exposed to an ar plasma of 10 s to clean the surface of the NiZnFeO.
To evaluate TE conversion of heat flow to voltage, cut the sample into 8 × 4-
Mm pieces using cutter.
To study heatflow-
Sensing Properties of LSSE-
Based on TE tablets, we use two commercial 4x4-
Mm Peltier module.
These two Peltier modules are attached to the top and bottom of the TE sheet, enabling us to heat one side of the TE sheet and cool the other side of the TE sheet.
The temperature difference applied in this way leads to the heat flow through the TE sheet. Because the in-
The plane thermal conductivity in our thin TE sheet is very small, and we can assume that the direction of the heat flow is almost perpendicular to the TE sheet.
While driving the heat flow, we simultaneously monitored the exact value of penetrating TE sheets using commercial filmsplate-shaped heat-flow sensor.
The sensor is placed between the upper Peltier module and the TE sheet, in direct contact with the Pt film of the TE sheet.
With this setup, we can assume that the heat flow is the same on the TE sheet and on the sensor.
The resulting TE voltage is measured with a digital multimeter.
Evaluation of bending LSSE-
As shown, we used a pair of oxides-
Curved coated aluminum block (
In the experiment, the TE sheet is clipped by a bump block with a certain bending curvature.
To study bending
Curvature related, we have prepared several pairs of such blocks with different surface curvature, where the lateral dimensions of the block are fixed to 20 × 20mm. The heat-flow-
The sensing properties of the curved TE sheet are evaluated in the same way as described above.
The heat flow is driven by two Peltier modules, which are connected to the top and bottom of the block pair of the clip.
Commercial 20x20-mm heat-
The flux sensor is also used to monitor the heat flow level through the TE sheet.