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Room temperature rubbing for few-layer two-dimensional thin flakes directly on flexible polymer substrates

by:Top-In     2020-02-10
Several-functional layerslayer two-dimensional (2-D)
Thin sheets on flexible polymers for tensile applications have aroused great interest.
However, most manufacturing methods are \"indirect\" processes that require a step transfer.
In addition, the \"transfer\" previously reported
The free \"method is applicable only to graphene and not to a few others-layer 2-D thin flakes.
Here, a friction-based method of room temperature friction is proposed for the manufacture of several different typeslayer 2-D thin flakes (
Graphene, hexagonal boron nitrogen (h-BN)
Sulfur and molybdenum (MoS2)
And tungsten sulfur (WS2))
On a flexible polymer substrateCommercial 2-
D raw materials (graphite, h-
BN, MoS2 and WS2)
Using layers containing thousands of atoms.
After a few minutes, different typeslayer 2-
D. prepare the sheet directly on the flexible polymer substrate by rubbing the program at room temperature without any transfer steps. These few-layer 2-
The D thin sheet is strongly adhered to the flexible polymer substrate.
This strong adhesion is beneficial for future applications.
PTFEPTFE)
Film is required to assist in the friction steps of sandpaper (Step-1)
PET film is required as a smoothing medium.
PET, PVC and PU films are used as flexible polymer substrates.
The method requires several polished sandpaper.
Commercial graphite series, h-
BN, MoS and WS powder are used as raw materials.
The commercial raw material powder is rubbed between the PTFE film and the polished sandpaper ()
By applying gentle pressure (0. 1u2005MPa)for 20 seconds.
This mild pressure is made of commercial rubber (
Yellow rectangle displayed in
This is fixed on commercial glass blocks.
In addition, this step is used to apply a thin and uniform layer of powder on polished sand paper.
The friction trajectory can be described as \"a revolution without self\"rotation” (
Like the friction trajectory we studied before).
The friction rate is 200 rpm and the friction diameter is 0. 5u2005cm.
After fixing PET film on commercial rubber (
Light gray part on yellow rubber)
, We rub polished sandpaper on PET film by applying soft pressure (0. 04u2005MPa)
At different times (
Different 2-50-300 secondsD raw materials).
This soft pressure is made of commercial rubber (
Yellow rectangle displayed in
Fixed on commercial glass blocks.
The friction trajectory used in this study corresponds to the friction trajectory used in our previous study.
The friction rate here is 200 rpm and the friction diameter is 0. 5u2005cm were used.
After this friction process, the polished sandpaper surface has different degrees of smoothness corresponding to the friction period.
After the polymer film is fixed (
PET or PVC or PU)
On a piece of commercial rubber (
Light gray part on yellow rubber)
, Rub the polymer film with polished sandpaper by applying soft pressure (0. 1u2005MPa)for 40 seconds.
This soft pressure is made of commercial rubber (
Yellow rectangle displayed in
Fixed on commercial glass blocks.
The friction trajectories used in this study are the same as those used in our previous study.
Friction rate of 200 rpm and friction diameter of 0. 5u2005cm were used.
This friction process is used to make samples. After Step-
3. the sample is cleaned in deionized water for 1 minute in the ultrasonic bath. (1)
Bending test: the sample is half bent
Round for 2 seconds.
The process was repeated 1 to 1000 times. (2)
Tape test: before tearing off the tape, paste the commercial tape with a pressure of 1 MPa and press it on a piece of the sample for 30 MPa minutes. (3)
Long-term ultrasonic cleaning test: Put a piece of the sample into an ultrasonic bath containing deionized water and clean it for 1 hour.
Raman spectrum of less-
Graphene layer and a small amount-
The characteristic of Raman spectroscopy of PVC film in layer MoS is (514u2005nm).
A few-thicknesslayer 2-
Test D sheet on PET film with atomic force microscope (AFM).
Size and Distribution of several
The graphene layer on PET film was observed by optical microscope.
Less-formlayer 2-
The field emission scanning electron microscope characterized the morphological changes of the D sheet on the PET film and the surface of polished sandpaper (FSEM).
Square resistance and optical transparency measurement of flexible transparent conductive film (few-
Single layer graphene/PET and a small amount-
Graphene/PU film)
Was taken away by four people.
Probe tester and UV-
Vis luminosity.
This sensor is manufactured by printing a silver soldering plate (4u2005cm × 1. 0u2005cm)onto 4u2005cm × 6. 0u2005cm sized few-
Layer the surface of the graphene/PU film to define the specific shape of the patterned.
The strain factor is calculated by testing the change of resistivity at different strain ratios as a reference. and Ref. .
Surface evolution behavior of sandpaper surface during Steps
3 is studied using the fractal power law equation: where ε is the unit of the side length of the box covered by the boundary and the number of boxes (
Different side length :)
What needs to cover the boundary is the fractal dimension.
In this study, = 1,2, 3,4, 5 is used to calculate by box-Count method.
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