Method for manufacturing metal oxide nano-wire/noble metal nanocrystalline composite material

A noble metal nanocrystal and composite material technology is applied in the field of manufacturing metal oxide nanowires/precious metal nanocrystal composite materials, which can solve the problems of harsh conditions, difficulty in manufacturing composite materials, and difficulty in controlling the uniformity of noble metals.

Inactive Publication Date: 2010-06-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the manufacture of this type of composite material is more difficult
It is mainly reflected in the following points: it is difficult to uniformly load noble metal nanocrystals on the surface of nanowires, the amount of noble metal nanocrystals loaded on the surface of nanowires is difficult to control, and there is no force between nanowires and noble metal nanocrystals. Stable metal oxide nanowire / noble metal nanocrystal composites are difficult
Although existing literature reports that metal oxide / noble metal nanocrystal composites can be produced by wet chemical methods or vapor deposition methods, the uniform distribution of noble metal nanocrystals obtained by wet chemical methods on the surface of metal oxides is not high (Journal of Materials Chemistry, 2008, Vol.18, pp.965-969); and the equipment required by the vapor deposition method is more complicated, the conditions are more harsh, and more importantly, the uniformity of the noble metal deposited on the surface of the metal oxide nanomaterial is difficult to control (Nano Letters, 2005, Vol.5, pp.667-673; Applied Physics Letters, 2007, Vol.91, pp.053111)

Method used

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  • Method for manufacturing metal oxide nano-wire/noble metal nanocrystalline composite material

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Experimental program
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Effect test

Embodiment 1

[0013] Example 1: Oxide nanowires are WO 3 Nanowires, noble metal nanocrystals are Au nanocrystals.

[0014] WO 3 For the preparation method of nanowires, please refer to the literature - Chemical Physics Letters, 2003, Vol.377, pp.317-321.

[0015] The preparation method of Au nanocrystals is as follows: 0.01 g of chloroauric acid (HAuCl 4 ·4H 2 O) Dissolve in 100 mL of deionized water, heat to boiling, add 2 mL of 1% trisodium citrate (Na 3 C 6 H 5 O 7 ·2H 2 O) aqueous solution; continue to heat and boil for 15min; after cooling to room temperature, restore to the original volume with distilled water. The obtained solution was centrifuged and washed with deionized water to obtain Au nanocrystals.

[0016] After ultrasonically dispersing 0.1 mg of Au nanocrystals in 5 mL of deionized water for 10-50 min, it was evenly added dropwise to 30 mL of 2-MEPA ethanol solution with a concentration of 1 mmol / L, stirred overnight for reaction, and centrifuged in a 3000 r / min hi...

Embodiment 2

[0018] Example 2: The oxide nanowires are SnO 2 Nanowires, noble metal nanocrystals are Pt nanocrystals.

[0019] SnO 2 The preparation method of nanowires can be found in the literature - Nanotechnology, 2008, Vol.19, pp.185705 (8pp).

[0020] The preparation method of Pt nanocrystals is as follows: 0.08g of polyvinylpyrrolidone (PVP) is dissolved in 7mL of ethylene glycol (EG), then the above solution is transferred into a 50mL three-neck flask, the temperature is raised to 160°C, the temperature is maintained for 10min, and the solution is rapidly added to a 50mL three-neck flask. It adds 1mL 80mmol / L of chloroplatinic acid (H 2 PtCl 6 ·6H 2 O), stop the reaction when the solution turns black. The obtained solution was centrifuged and washed with acetone to obtain Pt nanocrystals.

[0021] After ultrasonically dispersing 0.14 mg of Pt nanocrystals in 5 mL of ethanol for 10-50 min, it was evenly added dropwise to 30 mL of 2-MEPA ethanol solution with a concentration of...

Embodiment 3

[0023] Embodiment 3: The oxide nanowires are ZnO nanowires, and the noble metal nanocrystals are Pd nanocrystals.

[0024] For the preparation method of ZnO nanowires, please refer to the literature - Materials Chemistry and Physics, 2007, Vol.106, pp.58-62.

[0025] For the preparation method of Pd nanocrystals, please refer to the literature—Journal of the American Chemical Society, 2005, Vol.127, pp.7332-7333.

[0026] After ultrasonically dispersing 0.12mg Pd nanocrystals in 5mL of ethanol for 10-50min, it was evenly added dropwise to 30mL of 2-MEPA ethanol solution with a concentration of 1.5mmol / L, stirred overnight for reaction, and centrifuged in a 3000r / min high-speed centrifuge. , and washed with deionized water to prepare phosphoric acid-functionalized Pd nanocrystals.

[0027] The phosphoric acid-functionalized Pd nanocrystals were dispersed in 10 mL of ethanol, 60 mg of ZnO nanowires were added to it, after ultrasonic dispersion, the reaction was stirred overnigh...

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Abstract

The invention relates to a method for manufacturing a metal oxide nano-wire / noble metal nanocrystalline composite material. The method comprises the following steps: uniformly dispersing noble metal nanocrystalline in a solvent, dripping the solvent in ethanol solution of 2-mercaptoethylphosphoric acid for reaction overnight so as to obtain solution of phosphoric acid functionalized noble metal nanocrystalline; adding metal oxide nano-wires into the solution of phosphoric acid functionalized noble metal nanocrystal for reaction overnight, filtering the solution, and washing the solution with ethanol and deionized water to obtain the metal oxide nano-wire / noble metal nanocrystal composite material. The method adopts the 2-mercaptoethylphosphoric acid (2-MEPA) as a bonder to ensure that the noble metal nanocrystalline and the metal oxide nano-wires can be bonded through a functional organic group, and regulates and controls light characteristic, electrical characteristic, catalytic characteristic and sensitivity characteristic of the metal oxide nano-wire / noble metal nanocrystalline composite material by regulating the size of the noble metal nanocrystalline and dispersed state thereof on the surface of the metal oxide nano-wires.

Description

technical field [0001] The invention relates to a manufacturing method of a metal oxide nanowire / precious metal nanocrystal composite material, and belongs to the field of functional nanomaterial manufacturing. technical background [0002] Metal oxide nanowires / precious metal nanocrystal composites are a class of advanced functionalized nanomaterials, which can be widely used as high-performance catalytic materials, sensitive materials, biological materials, and energy materials. This type of composite material is based on metal oxide nanowires, and a certain number of noble metal nanocrystals are loaded on its surface through a special chemical self-assembly method. This type of composite material mainly changes the forbidden band width of the original nanowire system by introducing a certain amount of noble metal nanocrystals into the metal oxide nanowire system, so that the physical, chemical and biological properties of the system are changed. peculiar changes, so it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B1/00B82B3/00
Inventor 张源向群徐甲强许鹏程
Owner SHANGHAI UNIV
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