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Gold nano material adopting porous tubular hollow structure and preparation method of gold nano material

A technology of tubular structure and gold nano, which is applied in the field of gold nano material with porous tubular hollow structure and its preparation. Achieve the effect of poor repeatability, convenient operation and low cost

Inactive Publication Date: 2015-09-02
苏州冷石纳米材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the optical properties of these existing gold nanomaterials are not very adjustable whether they have a shell-core structure or a cage structure, and the cage structure only has discontinuous pores and the porosity is not high. Said that the specific surface area is not large enough
Retrieval shows that there is no report on the preparation method of gold nanomaterials with porous tubular hollow structure obtained by depositing gold with different thicknesses on its surface by using silver nanowires as templates, alloying them by annealing, and then corroding.

Method used

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  • Gold nano material adopting porous tubular hollow structure and preparation method of gold nano material
  • Gold nano material adopting porous tubular hollow structure and preparation method of gold nano material
  • Gold nano material adopting porous tubular hollow structure and preparation method of gold nano material

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Experimental program
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Embodiment 1

[0031] Preparation of silver nanowires: Add 10 milliliters of anhydrous ethylene glycol into a 50 milliliter three-neck flask, heat the oil bath to 155°C and keep the temperature constant for 1 hour, then mix the prepared 0.1 mol / liter silver nitrate ethylene glycol solution and 0.15 mol / liter Each 6 ml of polyvinylpyrrolidone ethylene glycol solution was added dropwise to the above-mentioned three-necked bottle at a rate of 0.45 ml / min at the same time, and then kept at the temperature for 1 hour after dripping, and then centrifuged to obtain a diameter of 80-110 nanometers and a length of 1-20 microns. of silver nanowires.

[0032]Preparation of gold nanomaterials with porous tubular hollow structure: disperse the obtained silver nanowires in 0.1 mol / liter cetyltrimethylammonium bromide aqueous solution, then add 0.04 mol / liter ascorbic acid aqueous solution as reducing agent, at 500 rpm Stir evenly at a stirring speed of 1 / min, then add 2 ml of 1 mmol / L chloroauric acid aqu...

Embodiment 2

[0033] Embodiment 2: Similar to the process of Example 1, but when preparing the gold nanomaterial of porous tubular hollow structure, the consumption of 1 mmol / liter of chloroauric acid aqueous solution is reduced to 1 milliliter, and the stirring reaction time is reduced to 15 minutes, and obtains Gold-silver composite core-shell nanostructure with thin shell. After washing with methanol and ultra-pure water, place it in 1 ml of concentrated nitric acid for corrosion reaction for about 15 minutes, then centrifuge to obtain a gold nanomaterial with a porous tubular hollow structure with relatively obvious pores. figure 2 It is a transmission electron microscope image of a gold nanomaterial with a porous tubular hollow structure, by figure 2 It can be seen that the pore distribution is already obvious, but because the amount of chloroauric acid is less, the tube wall is thinner.

Embodiment 3

[0034] Embodiment 3: Similar to the process of Example 1, but when preparing the gold nanomaterial of porous tubular hollow structure, the consumption of 1 mmol / L aqueous auric acid chloride solution was reduced to 0.5 milliliters, and the stirring reaction time was shortened to 10 minutes to obtain Gold-silver composite core-shell nanostructure with relatively thinner gold shell. Corroded with 1 ml of concentrated nitric acid and centrifuged to obtain a porous tubular hollow structure gold nanomaterial with large porosity and pore diameter. image 3 It is a transmission electron microscope image of a gold nanomaterial with a porous tubular hollow structure, by image 3 It can be seen that the walls are thinner and the pores are larger.

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Abstract

The invention discloses a gold nano material adopting a porous tubular hollow structure and a preparation method of the gold nano material. The gold nano material is a tubular structure with cavities inside, a plurality of holes are formed in the surface of the gold nano material, the inner diameter of each hole is 50-500 nanometers, the thickness of a tube wall of each hole is 1-50 nanometers, and the length of each hole is 1-20 micrometers; the diameter of each hole in the tube wall is 1-50 nanometers, the thickness of the hole wall is 1-50 nanometers, and the hole in the wall is a two-dimensional or three-dimensional hole. According to the method, firstly, a silver nanowire is prepared with a polyol process to serve as a template, then, a silver-gold composite core-shell nano structure is obtained through reaction and washed with ultrapure water to be dispersed in water, a product is annealed at certain temperature, and a gold-silver alloy is obtained; the alloy is placed in concentrated nitric acid to be corroded for a period of time and is separated finally, and the gold nano material which is similar to macroscopic porous gold in shape and adopts the hollow tubular structure is obtained. According to the method, the process is simple and easy to operate, the repeatability is good, the cost is low, and the obtained gold nano material can be used for the field of chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, optical information storage, drug targeting carriers, photo-thermal therapy of cancer cells and the like.

Description

technical field [0001] The invention relates to a nanomaterial with a porous tubular hollow structure and a preparation method thereof, in particular to a nanomaterial that can be used in chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, optical information storage, drug targeting carriers, cancer cell photothermal A gold nanomaterial with a porous tubular hollow structure with adjustable pore size, porosity, and wall thickness and a controllable size and a preparation method thereof. Background technique [0002] Since the late 1980s, Japanese scientist Haruta et al. found that gold nanoparticles loaded on metal oxides or activated carbon had good catalytic activity (Masataka Haruta, Tetsuhiko Kobayashi "Method for the production of ultra-fine gold particles immobilized on a metal oxide" US Patent, 4,839,327, June 13, 1989), gold has been extensively studied as a catalyst. Gold nanomaterials are receiving strong attention in the material scien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B82Y40/00B22F9/24
Inventor 丁轶
Owner 苏州冷石纳米材料科技有限公司
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