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Gold nanorod/silver/titanium dioxide core-shell nanocomposite structure and preparation method thereof

A gold nanorod and nanocomposite technology, which is applied in the field of gold nanorod/silver/titanium dioxide core-shell nanocomposite structure and its preparation, can solve the problem that the thickness of silver and titanium dioxide shells is not easy to control, etc.

Active Publication Date: 2021-04-13
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing gold nanorod / silver / titanium dioxide core-shell nanostructure preparation technology basically adopts the method of layer-by-layer coating, the thickness of the silver and titanium dioxide shells is not easy to control, the generally prepared titanium dioxide shell thickness is relatively thin, and is a solid structure

Method used

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  • Gold nanorod/silver/titanium dioxide core-shell nanocomposite structure and preparation method thereof
  • Gold nanorod/silver/titanium dioxide core-shell nanocomposite structure and preparation method thereof
  • Gold nanorod/silver/titanium dioxide core-shell nanocomposite structure and preparation method thereof

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preparation example Construction

[0020] (1) Preparation of gold nanorods / mesoporous titanium dioxide: You can refer to the existing technology, for example: first, prepare gold nanorods by seed growth method, take 1-10mL of hexadecyl trimethyl bromide prepared by seed method Ammonium (CTAB) stabilized gold nanorods were centrifuged twice at 5000-10000 rpm for 5-20 min each time. Remove the supernatant, add 0.1-1mL deionized water to the centrifuged solid to disperse, and obtain a volume-concentrated gold nanorod colloidal solution; take 5-75 μL of the concentrated gold nanorod colloidal aqueous solution, add 40-400 μL water to disperse, Then add 2-20μL of cetyltrimethylammonium bromide aqueous solution with a concentration of 0.01mol / L, 1-20μL of an aqueous sodium hydroxide solution with a concentration of 0.01-0.1mol / L and 3-300μL of a 0.01mol / L aqueous solution with a concentration of 0.01mol / L. The ethanol solution of bis(acetylacetonato)diisopropyl titanate (TDAA) of L, the reaction system keeps shaking o...

Embodiment

[0024] 1) Preparation of gold nanorods / mesoporous titanium dioxide: The preparation of gold nanorods / mesoporous titanium dioxide samples can refer to the prior art. First, the seed growth method can be used to prepare gold nanorods. Take 10 mL of 16 Gold nanorods stabilized with alkyltrimethylammonium bromide (CTAB) were centrifuged twice at 8000 rpm for 20 min each. Remove the supernatant, add 1 mL of ionic water to the centrifuged solid to obtain a concentrated gold nanorod colloidal aqueous solution; take 75 μL of the concentrated gold nanorod colloidal aqueous solution, add 400 μL of water to disperse, and then add 20 μL of 0.01 mol / L of cetyltrimethylammonium bromide aqueous solution, 2 μL of 0.1mol / L sodium hydroxide aqueous solution and 100 μL of 0.01mol / L bis(acetylacetonate) diisopropyl titanate Ethanol solution, the reaction system keeps shaking or magnetically stirred during the addition process, react at room temperature for about 2 hours, and obtain a colloidal s...

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Abstract

The invention discloses a gold nanorod / silver / titanium dioxide core-shell nanocomposite structure and a preparation method thereof. A colloidal solution of a certain volume of gold nanorod / mesoporous titanium dioxide core-shell nanostructure is taken and washed with a centrifuge for 1-6 time; then add an equal volume of cetyltrimethylammonium chloride aqueous solution to disperse the centrifuged precipitate, and ultrasonically treat it; add silver nitrate solution and ascorbic acid solution successively to the colloidal solution after ultrasonic treatment, and then The reaction system is placed in a 40-90°C water bath to react, and the gold nanorod / silver / mesoporous titanium dioxide core-shell nanocomposite material is obtained. The present invention is based on the gold nanorod / mesoporous titanium dioxide core-shell nanocomposite structure, uses the mesopores in the titanium dioxide shell as ion channels, and coats a layer of silver nanoshell with controllable thickness on the surface of the gold nanorod. Gold nanorod / silver / titanium dioxide materials have potential applications in the early diagnosis and treatment of major diseases such as cancer.

Description

technical field [0001] The invention relates to the technical field of gold nanorod composite materials, in particular to a gold nanorod / silver / titanium dioxide core-shell nanocomposite structure and a preparation method thereof. Background technique [0002] The photocatalytic technology of nanomaterials based on noble metal plasma enhancement is one of the hotspots in the field of nanomaterials. Titanium dioxide has become one of the most commonly used photocatalytic materials due to its good photocatalytic activity, good stability and low toxicity. Nanostructured titanium dioxide has better photocatalytic performance than bulk materials, and the photocatalytic performance of titanium dioxide nanostructures can be further improved by using the plasmonic enhancement effect of noble metal nanomaterials. The study found that under the same conditions, the gold nanorod / titanium dioxide core-shell nanostructure (Au NR / TiO 2 ) photocatalytic activity is weaker than gold nanorod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B82Y40/00
CPCB82Y40/00B22F1/07B22F1/17
Inventor 赵军伟安俊超倪卫海王利剑徐鹏宇留伟亮
Owner LUOYANG INST OF SCI & TECH