Electric in-situ buckle background method for graphene plasmon reinforcing infrared spectroscopy detection
A plasmon enhancement, infrared spectroscopy technology, applied in color/spectral property measurement, nanotechnology, etc., can solve the problems of limited detection capability, improved repeatability, and narrow enhancement band.
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Embodiment 1
[0049] In this example, CaF 2 As an example of a dielectric layer, the graphene plasmonic device of the present invention is used to perform infrared detection on a polyethylene oxide (PEO) film.
[0050] 1. Conduct electrical tests on the graphene microstructure, measure the transport curve of graphene, and obtain the voltage corresponding to the Dirac point of graphene.
[0051] Measure the Ids-Vg transport curve of graphene, and read the voltage Vg(CNP) corresponding to the Dirac point of graphene. According to this example, with CaF 2 The Ids-Vg transport curve of graphene measured as a dielectric layer, as shown in Figure 5(a), shows a bipolar "V" shape. The gate voltage at 5 V corresponds to the neutral position of graphene charge doping (ie the graphene Dirac point).
[0052] 2. Infrared signal detection is carried out by using the method of subtracting the background in situ.
[0053] a) With the voltage of Vg(CNP) (i.e. 5V) as the detection background, select a ce...
Embodiment 2
[0057] In this example, CaF 2 As an example of a dielectric layer, the graphene plasmonic device of the present invention is used for infrared detection of a single layer of boron nitride (BN).
[0058] 1. Conduct electrical tests on the graphene microstructure, measure the transport curve of graphene, and obtain the voltage corresponding to the Dirac point of graphene.
[0059] Measure the Ids-Vg transport curve of graphene, and read the voltage Vg(CNP) corresponding to the Dirac point of graphene. According to this example, with CaF 2 The Ids-Vg transport curve of graphene measured as a dielectric layer, as shown in Figure 6(a), shows a bipolar "V" shape. The gate voltage at 5 V corresponds to the neutral position of graphene charge doping (ie the graphene Dirac point).
[0060] 2. Infrared signal detection is carried out by using the method of subtracting the background in situ.
[0061] a) With the voltage of Vg(CNP) (i.e. 5V) as the detection background, select a cert...
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