Line peak separation method for graphene plasmon-enhanced infrared spectroscopy detection

A technology of plasmon enhancement and spectral line peaking, applied in the field of infrared light detection, can solve the problems of lack of universal significance for trace molecule detection, narrow enhancement band, and improved repeatability

Active Publication Date: 2018-10-30
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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Problems solved by technology

However, at present, this technology has the defects of very narrow enhanced band, greatly limited detection capability, and poor repeatability, and it does not have the universal significance of trace molecular detection.

Method used

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  • Line peak separation method for graphene plasmon-enhanced infrared spectroscopy detection
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  • Line peak separation method for graphene plasmon-enhanced infrared spectroscopy detection

Examples

Experimental program
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Embodiment

[0045] 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.

[0046] 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.

[0047] 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).

[0048] 2. Separating the peaks of the infrared detection spectrum by adjusting the gate voltage.

[0049] a) Take the voltage of Vg(CNP) (i.e. 5V) as the detection background, select a certain point o...

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Abstract

The invention provides a spectral-line peak-value separation method employing graphene plasmons-enhanced infrared spectroscopy detection. The method comprises (1) preparing an infrared enhancing and detection device for a graphene plasmons component; 2) putting a to-be-detected object on graphene microstructure; 3) performing electrical test on the graphene microstructure, concretely, measuring the Ids-Vg transportation curve of graphene, and reading the voltage Vg(CNP) corresponding to the Dirac point of graphene; 4) separating the infrared detection spectral-line peak value by adjusting the grid voltage, and concretely comprising the following steps: a) acquiring the extinction spectrum T (CNP) under the voltage Vg (CNP) corresponding to the Dirac point of graphene, and taking as a background; b) after background acquisition is finished, adjusting the grid voltage Vg to the grid voltage Vg to deviate from the voltage corresponding to the Dirac point of graphene, then acquiring signals of the sample under different voltages, then acquiring the extinction spectrum T (EF) again, and gradually increasing the step length of Vg, so as to enable a peak covered in an intrinsic signal to emerge.

Description

technical field [0001] The invention relates to the technical field of infrared light detection, in particular to a spectral line peak separation method for graphene plasmon enhanced infrared spectrum detection. Background technique [0002] Infrared radiation contains rich objective information, and its detection has attracted much attention. Infrared detectors have covered short-wave, medium-wave and long-wave ranges, and have been widely used in military and civilian fields. Its detection principle is to use the photoelectric conversion performance of the material to convert the photon signal of infrared radiation into an electronic signal, and combine it with an external circuit to achieve the goal of detecting infrared light signals. [0003] Graphene is a two-dimensional crystal composed of a single layer of carbon atoms, and the thickness of a single layer of graphite is about 0.35nm. Currently, graphite with less than ten layers is regarded as graphene. With excel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3563
CPCG01N21/35
Inventor 戴庆胡海胡德波白冰刘瑞娜杨晓霞
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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