Wide-spectrum optical detector and preparation method thereof

A detector and wide-spectrum light technology, which is applied in the field of wide-spectrum light detectors and its preparation, can solve the problem of insufficient attention to the photothermal effect, low photothermal conversion efficiency, and stable combination of photothermal film and thermistor To achieve the effect of improving the photothermal conversion effect, significant photothermal effect, and simple structure

Active Publication Date: 2021-01-29
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of photothermal effect in light detection has not received enough attention.
On the one hand, the light-to-heat conversion efficiency of existing photothermal films is low. On the other hand, the stable combination of photothermal films and thermistors is also a technical problem.

Method used

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  • Wide-spectrum optical detector and preparation method thereof
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  • Wide-spectrum optical detector and preparation method thereof

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Embodiment 1

[0031] A method for preparing a wide-spectrum photodetector, comprising the following steps:

[0032] (1) Prepare graphene ink: 10wt% reduced graphene oxide, 30wt% organosilicon modified acrylic resin, 5wt% amino resin, 2wt% polyvinylpyrrolidone are dispersed in 53wt% deionized water, and with magnetic stirrer at 2r / s Stirred under the rotating speed of 3 hours;

[0033] (2) Preparation of transparent polymer: mix polydimethylsiloxane and curing agent in a mass ratio of 8:1, stir it with a glass rod to make it fully mixed, and the mixture turns milky white after stirring, wherein There are many small bubbles, after standing for about 30 minutes, the small bubbles disappear, and the mixture becomes a transparent substance;

[0034] (3) Covering graphene thin layer 2: Thermistor 1 is a positive temperature coefficient thermistor with a sensitivity greater than or equal to 3Ω / °C and an operating temperature range of 0 to 200°C. Put thermistor 1 in the graphene ink solution In t...

Embodiment 2

[0038]A method for preparing a wide-spectrum photodetector, comprising the following steps:

[0039] (1) Prepare graphene ink: 20wt% reduced graphene oxide, 40wt% organosilicon modified acrylic resin, 15wt% amino resin, 8wt% polyvinylpyrrolidone are dispersed in 17wt% deionized water, and with magnetic stirrer at 3r / s Stirred under the rotating speed of 3 hours;

[0040] (2) Preparation of transparent polymer: mix polydimethylsiloxane and curing agent in a mass ratio of 15:1, stir it with a glass rod to make it fully mixed, and the mixture turns milky white after stirring, wherein There are many small bubbles, after standing for about 60 minutes, the small bubbles disappear, and the mixture becomes a transparent substance;

[0041] (3) Covering graphene thin layer 2: Thermistor 1 is a negative temperature coefficient thermistor with a sensitivity greater than or equal to 3Ω / °C and an operating temperature range of 0 to 200°C. Put thermistor 1 in the graphene ink solution In ...

Embodiment 3

[0045] A method for preparing a wide-spectrum photodetector, comprising the following steps:

[0046] (1) Prepare graphene ink: 15wt% reduced graphene oxide, 35wt% organosilicon modified acrylic resin, 10wt% amino resin, 4wt% polyvinylpyrrolidone are dispersed in 36wt% deionized water, and with magnetic stirrer at 3r / s Stirred under the rotating speed of 3 hours;

[0047] (2) Preparation of transparent polymer: mix polydimethylsiloxane and curing agent in a mass ratio of 10:1, stir it with a glass rod to make it fully mixed, and the mixture turns milky white after stirring, wherein There are many small bubbles, after standing for about 45 minutes, the small bubbles disappear and the mixture becomes a transparent substance;

[0048] (3) Cover graphene thin layer 2: Thermistor 1 is NTC-MF52AT, the sensitivity is greater than or equal to 3Ω / °C, and the working temperature range is 0-200°C. Put thermistor 1 in the graphene ink solution, Dip about 4 mg of graphene ink, and contro...

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Abstract

The invention discloses a wide-spectrum optical detector and a preparation method thereof, the wide-spectrum optical detector comprises a thermistor, a graphene ink layer and a transparent polymer layer, the surface of the thermistor is coated with the graphene ink layer, and the surface of the graphene ink layer is coated with the transparent polymer layer. The preparation method comprises the following steps: putting the thermistor into the graphene ink solution, coating with graphene ink, controlling the thickness of the graphene ink layer to be 130-330 microns, and naturally drying in airto obtain the graphene ink layer coated thermistor; and putting the thermistor coated with the graphene ink layer into the transparent polymer, coating with the transparent polymer, controlling the thickness of the transparent polymer layer to be 400-550 microns, and naturally drying in the air to obtain the wide-spectrum optical detector. The detector is simple in structure and low in cost, the graphene ink and the transparent medium are easy to prepare, and the photothermal efficiency and the responsivity to illumination of the detector are remarkably improved.

Description

technical field [0001] The invention relates to a photoelectric detector and a preparation method thereof, in particular to a wide-spectrum photodetector and a preparation method thereof. Background technique [0002] Photodetectors have aroused extensive research interest due to their great potential for applications in communication, imaging, spectroscopy, and sensing. Photodetectors can convert optical signals into electrical signals. According to the working mechanism of the device, the detectors can be divided into two categories: thermal detectors and photon detectors. Existing thermal detectors are mainly based on the photothermoelectric effect, which includes photothermal and thermoelectric conversion processes, enabling ultra-broadband detection without cooling units and external biasing. Basic thermoelectric effects include Seebeck, Peltier, Thomson effects, etc. In recent decades, with the discovery of new thermoelectric materials and the development of nanophot...

Claims

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Application Information

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IPC IPC(8): G01J1/42G01J5/20
CPCG01J1/42G01J5/20Y02P70/50
Inventor甘志星熊美玉刘慈慧狄云松
OwnerNANJING NORMAL UNIVERSITY