Preparation method of silver/graphene composite films and application of preparation method in ultraviolet detectors

A technology of ultraviolet detector and composite film, which is applied in the direction of using electric radiation detectors for photometry, ultraviolet measurement, and devices for coating liquid on the surface, etc. Improved agglomeration, enabling large-scale batch production, short response and recovery times

Active Publication Date: 2017-01-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At present, the modification of graphene with silver nanoparticles is usually completed by one-step reduction of graphene oxide and silver composite solution with hydrazine hydrate. However, during the reduction process, silver ions will nucleate and crystallize with itself as the center, leading to the aggregation of silver nanoparticles and affecting the composite solution. Film properties

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  • Preparation method of silver/graphene composite films and application of preparation method in ultraviolet detectors
  • Preparation method of silver/graphene composite films and application of preparation method in ultraviolet detectors
  • Preparation method of silver/graphene composite films and application of preparation method in ultraviolet detectors

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Embodiment

[0034] The sources of raw materials in the examples are: graphene oxide (>99wt%) and hydrazine hydrate (>98wt%) were purchased from Nanjing Pioneer Technology Company, and silver nitrate and sodium citrate powder were purchased from Aladdin Biochemical Technology Company.

[0035] A preparation method of graphene-silver nanoparticle composite film, comprising the following steps:

[0036] Step 1: At room temperature, weigh 30mg of graphene oxide (>99wt%) and grind it into powder, mix it with 1mL of hydrazine hydrate (>98wt%), add 100mL of deionized water, and sonicate for 1h until there are no obvious particles to obtain uniform graphene oxide Dispersions;

[0037] Step 2: The graphene oxide dispersion obtained in step 1 was stirred and reacted in an oil bath at 100°C for 24 hours to complete the first in-situ reduction;

[0038] Step 3: At room temperature, weigh 45 mg of silver nitrate powder and 1 mg of sodium citrate, add 20 mL of deionized water, and ultrasonically mix u...

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Abstract

The invention discloses a preparation method of silver / graphene composite films and an application of the preparation method in ultraviolet detectors and belongs to the technical field of functional materials. The graphene / silver nanoparticle composite films are prepared through two-step in-site reduction on graphene oxide and silver salt through hydrazine hydrate and sodium citrate, silver ion takes a graphene sheet as nuclear crystallization as compared with a single-step reduction method and is more evenly modified on the graphene, and the problem about agglomeration of silever nanoparticles is effectively improved. A graphene / silver nanoparticle composite solution is prepared through two-step in-situ reduction on the graphene oxide and silver nitrate through the hydrazine hydrate and the sodium citrate and is coated on a silicon substrate to be dried to form the films, and finally a sputtering gold electrode serves as a top electrode to complete the ultraviolet detectors; the ultraviolet detectors based on the graphene / silver nanoparticle composite films are high in light current and short in response and recovery time.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for preparing a composite thin film by modifying graphene with silver nanoparticles, and the application of the composite thin film in an ultraviolet detector. Background technique [0002] Graphene is a kind of sp with honeycomb structure 2 Hybrid two-dimensional materials have excellent mechanical, optical, electrical, thermal and other properties. At present, the methods for preparing graphene mainly include mechanical exfoliation method, vapor phase deposition method and reduced graphene oxide method. The unique nanostructure of graphene provides convenience for its modification to form graphene derivatives. In recent years, the modification of graphene with specific functional materials to improve the performance of devices has attracted widespread attention of researchers. The reduced graphene oxide method can effectively realize the modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B05D1/00G01J1/42B82Y40/00
CPCB05D1/005B22F9/24B82Y40/00G01J1/429
Inventor 林媛姚光张虎林
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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