Method for preparing nano-porous gold film through treating graphene as template

Abstract

The invention belongs to the technical field of meso-porous materials, and concretely relates to a method for preparing a large-area uniform nano-porous gold film through treating graphene as a template. A gold nanoparticle / graphene composite material film adopted as a raw material can be obtained through a heating reaction in water through a one-step process, the template graphene is removed through adopting two annealing modes comprising direct calcining in air at 600-800DEG C or heating in nitrogen to 600-800DEG C and instant exposure to air, and the nano-porous gold film material having the characteristics of large area, uniformity and different microstructures can be prepared. The poriness of the nano-porous gold film can be adjusted through adjusting the proportions of the two components in the gold nanoparticle / graphene composite material film. Compared with traditional methods for preparing nano-porous gold films through treating colloidal particles as a template or through an alloy removal process, the method provided by the invention has the advantages of simple operation process, mild preparation conditions, nontoxic and environmentally-friendly reagents, and effective control of the morphology of the nano-porous structure, so the method has a wide application prospect.

Description

technical field

[0001] The invention belongs to the technical field of mesoporous materials, and in particular relates to a method for preparing a large-area uniform nanoporous gold film using graphene as a template. Background technique

[0002] Porous metal materials are a new class of functional materials, which not only have the excellent electrical conductivity, thermal conductivity, catalytic and ductility properties of metal substances, but also have the characteristics of high specific surface area, low density and high specific strength of nanostructured materials (such as aerogels) . Owing to their rich surface chemistry, porous metal materials are widely used in catalysis, electrocatalysis, sensors, supercapacitors, and optics and biology. At present, the most commonly used methods for preparing porous metal materials include dealloying, ablation, template, sol-gel self-assembly, electrochemical etching, and laser ablation. Among them, the template method is a v...

Examples

Embodiment 1

[0023] Sonicate chloroauric acid trihydrate (0.6, 1.6, 2.5 or 6.5 mmol / L), graphene oxide (0.1 mg / mL) and sodium citrate (10 mg / mL) in water for 2 min to disperse evenly; the mixture put in 100 o Stirring and heating reaction in C oil bath for 24 h to prepare gold nanoparticles / graphene composites (gold:graphene mass ratios were 1:1.3, 1:3.1, 1:5.0 and 1:6.3); After cooling, pour off the supernatant as much as possible, then centrifuge and wash the product three times at 5000 rpm until the supernatant is colorless, and the washing solvent is deionized water; redisperse the product in deionized water at a concentration of 0.1 mg / mL (with graphite olefin is the reference concentration); take 20 mL of the product dispersion, vacuum filter and wash with deionized water, the filter membrane is a mixed cellulose ester membrane with a pore size of 0.2 microns; dry the wet membrane in air for 1-2 days , the black composite film can be peeled off by itself; take about 10 mg of the com...

Embodiment 2

[0026] Sonicate chloroauric acid trihydrate (0.6, 1.6, 2.5 or 6.5 mmol / L), graphene oxide (0.1 mg / mL) and sodium citrate (10 mg / mL) in water for 2 min to disperse evenly; the mixture put in 100 o Stirring and heating reaction in C oil bath for 24 h to prepare gold nanoparticles / graphene composites (gold:graphene mass ratios were 1:1.3, 1:3.1, 1:5.0 and 1:6.3); After cooling, pour off the supernatant as much as possible, then centrifuge and wash the product three times at 5000 rpm until the supernatant is colorless, and the washing solvent is deionized water; redisperse the product in deionized water at a concentration of 0.1 mg / mL (with graphite olefin is the reference concentration); take 20 mL of the product dispersion, vacuum filter and wash with deionized water, the filter membrane is a mixed cellulose ester membrane with a pore size of 0.2 microns; dry the wet membrane in air for 1-2 days , the black composite film can be peeled off by itself; about 10 mg of the composit...

technical field

[0001] The invention belongs to the technical field of mesoporous materials, and in particular relates to a method for preparing a large-area uniform nanoporous gold film using graphene as a template. Background technique

[0002] Porous metal materials are a new class of functional materials, which not only have the excellent electrical conductivity, thermal conductivity, catalytic and ductility properties of metal substances, but also have the characteristics of high specific surface area, low density and high specific strength of nanostructured materials (such as aerogels) . Owing to their rich surface chemistry, porous metal materials are widely used in catalysis, electrocatalysis, sensors, supercapacitors, and optics and biology. At present, the most commonly used methods for preparing porous metal materials include dealloying, ablation, template, sol-gel self-assembly, electrochemical etching, and laser ablation. Among them, the template method is a v...

Examples

Embodiment 1

[0023] Sonicate chloroauric acid trihydrate (0.6, 1.6, 2.5 or 6.5 mmol / L), graphene oxide (0.1 mg / mL) and sodium citrate (10 mg / mL) in water for 2 min to disperse evenly; the mixture put in 100 o Stirring and heating reaction in C oil bath for 24 h to prepare gold nanoparticles / graphene composites (gold:graphene mass ratios were 1:1.3, 1:3.1, 1:5.0 and 1:6.3); After cooling, pour off the supernatant as much as possible, then centrifuge and wash the product three times at 5000 rpm until the supernatant is colorless, and the washing solvent is deionized water; redisperse the product in deionized water at a concentration of 0.1 mg / mL (with graphite olefin is the reference concentration); take 20 mL of the product dispersion, vacuum filter and wash with deionized water, the filter membrane is a mixed cellulose ester membrane with a pore size of 0.2 microns; dry the wet membrane in air for 1-2 days , the black composite film can be peeled off by itself; take about 10 mg of the com...

Embodiment 2

[0026] Sonicate chloroauric acid trihydrate (0.6, 1.6, 2.5 or 6.5 mmol / L), graphene oxide (0.1 mg / mL) and sodium citrate (10 mg / mL) in water for 2 min to disperse evenly; the mixture put in 100 o Stirring and heating reaction in C oil bath for 24 h to prepare gold nanoparticles / graphene composites (gold:graphene mass ratios were 1:1.3, 1:3.1, 1:5.0 and 1:6.3); After cooling, pour off the supernatant as much as possible, then centrifuge and wash the product three times at 5000 rpm until the supernatant is colorless, and the washing solvent is deionized water; redisperse the product in deionized water at a concentration of 0.1 mg / mL (with graphite olefin is the reference concentration); take 20 mL of the product dispersion, vacuum filter and wash with deionized water, the filter membrane is a mixed cellulose ester membrane with a pore size of 0.2 microns; dry the wet membrane in air for 1-2 days , the black composite film can be peeled off by itself; about 10 mg of the composit...

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