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Method for synthesizing noble metal superfine nanowire water phase and establishing noble metal nanopore membrane by self-precipitation thereof

A precious metal, ultra-fine nano technology, applied in the fields of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of non-construction of precious metal nanoporous films, limitations, etc., to achieve wide applicability, time saving, low cost. cost effect

Inactive Publication Date: 2013-05-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conditions such as the strong acid used for dealloying, the organic solvent or plasma in the process of removing the stencil, and the aging time of more than ten days limit the promotion of the above method.
Although the solution precipitation method has the advantages of convenient operation and easy thickness control, it has been widely used to obtain metal oxide, halide and hydroxide thin films, but so far this method has not been used to construct noble metal nanoporous membranes.

Method used

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  • Method for synthesizing noble metal superfine nanowire water phase and establishing noble metal nanopore membrane by self-precipitation thereof
  • Method for synthesizing noble metal superfine nanowire water phase and establishing noble metal nanopore membrane by self-precipitation thereof
  • Method for synthesizing noble metal superfine nanowire water phase and establishing noble metal nanopore membrane by self-precipitation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1: Synthesis of Gold Ultrafine Nanowires

[0076] Using TX-114 as stabilizer and structure control agent, KBH 4 as reducing agent. 0.05mmol HAuCl 4 and 25mg of TX-114 were dissolved in 47ml of Millipore ultrapure water and added to a sealed 50ml conical flask. After stirring at 1000rpm in an ice bath for five minutes, 3ml of 100mM KBH was rapidly injected into the solution with a syringe. 4 The solution was stirred for 10 seconds, and the color of the solution changed from bright yellow to brown, and finally red to dark gray. After the reaction is completed, add 25 mg of TX-114 to the solution, mix well, centrifuge at 1500 rpm for 10 minutes at 60°C, discard the supernatant, and redisperse the lower cloud point phase in Millipore ultrapure water to reconstitute the corresponding precious metals. Nanowire aqueous solution / dispersion. It was observed by transmission electron microscope (TEM, H-7500, Hitachi) and high-resolution transmission electron microscope...

Embodiment 2

[0077] Example 2: Synthesis of Pt ultrafine nanowires

[0078] Using TX-114 as stabilizer and structure control agent, KBH 4 as reducing agent. 0.05mmolH 2 PtCl 6 and 25mg TX-114 were dissolved in 48ml Millipore ultrapure water and added to a sealed 50ml Erlenmeyer flask. After stirring for five minutes at 1000rpm in an ice bath, 2ml of 100mM KBH was rapidly injected into the solution with a syringe. 4 solution and continue stirring for 10 seconds. After the reaction is completed, add 25mg TX-114 to the solution, mix well, centrifuge at 1500rpm for 10 minutes at 60°C, discard the supernatant, and redisperse the lower cloud point phase in Millipore ultrapure water to obtain a solution / dispersion again. liquid. It was observed by transmission electron microscope (TEM, H-7500, Hitachi) and high-resolution transmission electron microscope (HRTEM, JEM-2100F, JEOL) and processed with image plus software, and its diameter was 2.04±0.36nm. (like figure 2 , the left picture is ...

Embodiment 3

[0079] Example 3: Synthesis of Pd Ultrafine Nanowires

[0080] Using TX-114 as stabilizer and structure control agent, KBH 4 as reducing agent. 0.05mmolPd(NO 3 ) 2and 25mg of TX-114 were dissolved in 49ml of Millipore ultrapure water and added to a sealed 50ml conical flask. After stirring for five minutes at 1000rpm in an ice bath, 1ml of 100mM KBH was rapidly injected into the solution with a syringe. 4 solution and continue stirring for 10 seconds. After the reaction is completed, add 25mg TX-114 to the solution, mix well, centrifuge at 1500rpm for 10 minutes at 60°C, discard the supernatant, and redisperse the lower cloud point phase in Millipore ultrapure water to obtain the solution / dispersion again. . It was observed by transmission electron microscope (TEM, H-7500, Hitachi) and high-resolution transmission electron microscope (HRTEM, JEM-2100F, JEOL) and processed with image plus software, and its diameter was 2.48±0.42nm. (like image 3 , the left picture is th...

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Abstract

Methods for synthesizing noble metal (Au, Pd, Pt) nanowires and organizing noble metal nanoporous films by self-sedimentation are provided. The methods comprise the following steps: the non-ionic surfactant of 0.05% (W / V) is added into the noble metal precursor (HAuCl4, H2PtCl6, Pd(NO3)2) solution with a concentration of 1mmol-L-1 which is then stirred and mixed. KBH4(or NaBH4) is added by 6 times, 4 times and 2 times the amount of the metal precursor for HAuCl4, H2PtCl6 and Pd(NO3)2 respectively, after the mixture has been stirred for 5-10 minutes in an ice-colded aqueous solution. The metal precursor in the mixture is reduced completely to synthesize the said metal ultrathin (=3nm) mesh nanowires under vigorous stirring. By further adding the non-ionic surfactant of 0.05% (W / V) into the synthesized nanowires dispersion solution, mixing uniformly and centrifuging at 600C for 10 minutes, the nanometer material can be separated and purified. The corresponding noble metal nanoporous films can be acquired by adding NaCl till 5mM ( the extra adding of NaCl is not necessary for the Au nanowire) into the synthesized nanowires aqueous dispersion solution and placing the solution still for 12 hours.

Description

technical field [0001] The invention relates to a method for synthesizing precious metal ultrafine nanowires in water and constructing nanoporous films of precious metals by self-settling of ultrafine metal nanowires, in particular to a method for constructing nanowires and nanoporous films suitable for the field of catalysis Background technique [0002] The morphology-controllable synthesis of various nanostructures is currently a research hotspot in the field of materials science, and the great potential of nanocatalysts in chemical production, pollution control, and energy conversion facilitates this nano craze. It is generally believed that the catalytic performance of nanomaterials strongly depends on the size and morphology of the nanocatalysts. Precious metal ultrafine nanowires have attracted much attention as catalysts because of their unique quantum confinement / small size benefit-related physicochemical properties and outstanding catalytic properties. For example...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B82B3/00
CPCB22F9/24B82B3/00C30B29/60B22F1/0025C30B7/14C30B29/02B22F1/0547
Inventor 刘景富刘睿于素娟江桂斌
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI