Method for preparing controllable noble metal nanoparticles through femtosecond laser regulation and control electric replacement reaction

A nanoparticle and femtosecond laser technology, applied in the field of laser chemistry, can solve the problems of complex operation process and general controllability, and achieve the effects of strong chemical reduction, excellent Raman detection performance, and high processing efficiency

Pending Publication Date: 2021-08-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
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  • Application Information

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Problems solved by technology

[0006] In order to solve the existing problems of complex operation procedures, most of which require masks and relatively general controllability in the preparation of controllable noble metal nanoparticles by controlling the deposition site of the electrodisplacement reaction, the femtosecond laser regulated electrodisplacement reaction preparation disclosed in the present invention The technical problem to be solved by the method of controllable noble metal nanoparticles is: to provide a method for controlling the deposition site of the electro-displacement reaction, so as to realize the simple and efficient preparation of large-area noble metal nanoparticles with controllable deposition sites. The size and distribution density improve its application performance

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  • Method for preparing controllable noble metal nanoparticles through femtosecond laser regulation and control electric replacement reaction
  • Method for preparing controllable noble metal nanoparticles through femtosecond laser regulation and control electric replacement reaction
  • Method for preparing controllable noble metal nanoparticles through femtosecond laser regulation and control electric replacement reaction

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Embodiment 1

[0031] The specific steps of preparing platinum nanoparticles with controllable deposition sites by using femtosecond laser regulated electrodisplacement reaction are as follows:

[0032] (1) Fix the single crystal silicon wafer with crystal orientation after cleaning and drying on the high-precision six-dimensional processing translation table;

[0033] (2) The Gaussian laser output by the femtosecond laser passes through a cylindrical mirror with a focal length of 50mm, shaping the Gaussian distributed laser into a linearly distributed laser, and focusing it on the single crystal silicon fixed on the six-dimensional linkage electronic control platform Above, the laser processing parameters were adjusted to a pre-focus spot diameter of 5 mm, a pulse energy of 60 μJ, and a laser scanning speed of 2000 μm / s. A single scribing scan can form a large-area uniform modified micro-nano structure. The same process was carried out three times to obtain three samples after laser pretr...

Embodiment 2

[0036] The specific steps of preparing gold nanoparticles with controllable deposition sites by using femtosecond laser to regulate the electrodisplacement reaction are as follows:

[0037] (1) Fix the single crystal silicon wafer with crystal orientation after cleaning and drying on the high-precision six-dimensional processing translation table;

[0038] (2) The Gaussian laser output by the femtosecond laser passes through a cylindrical mirror with a focal length of 50mm, shaping the Gaussian distributed laser into a linearly distributed laser, and focusing it on the single crystal silicon fixed on the six-dimensional linkage electronic control platform Above, the laser processing parameters were adjusted to a pre-focus spot diameter of 5 mm, a pulse energy of 60 μJ, and a laser scanning speed of 2000 μm / s. A single scribing scan can form a large-area uniform modified micro-nano structure. The same process was carried out three times to obtain three samples after laser pre...

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Abstract

The invention discloses a method for preparing controllable noble metal nanoparticles through femtosecond laser regulation and control electric replacement reaction, and belongs to the field of laser chemistry. The implementation method comprises the following steps that 1, the local free electron density on the surface of monocrystalline silicon is regulated and controlled through cylindrical mirror spatial light-shaped femtosecond laser, periodic amorphous state transformation is generated, and a large-area uniform modified micro-nano structure is efficiently formed; and 2, noble metal ions is reduced by performing galvanic replacement reactions, single crystal silicon and the amorphous silicon which are adjacent can form a positive and negative electrode structure similar to a primary battery, and due to the fact that the amorphous silicon formed through laser induction contains a large number of dangling bonds, the chemical reducibility of the amorphous silicon is higher, the amorphous silicon as a negative electrode loses electrons in the electric replacement reaction, electrons are transferred to the surface of monocrystalline silicon serving as a positive electrode,noble metal nanoparticles are only selectively deposited in an area which is not modified by laser, the large-area precious metal nanoparticles with controllable deposition sites are simply, conveniently and efficiently prepared, and the application performance of the nanoparticles is improved by regulating and controlling the size and distribution density of the nanoparticles.

Description

technical field [0001] The invention relates to a method for preparing controllable noble metal nanoparticles by femtosecond laser-regulated electric displacement reaction, and belongs to the field of laser chemistry. Background technique [0002] Due to their unique physicochemical properties, noble metal nanoparticles have a wide range of applications in the fields of catalysis, surface-enhanced Raman scattering, and superhydrophobicity. For example, platinum is currently considered to be the best single-metal catalyst for oxygen reduction due to its special d-band vacancy; gold is often used for the preparation of SERS detection due to its excellent localized surface plasmon resonance performance and chemical stability base. It is worth noting that whether noble metal nanoparticles can be prepared in a large-area and controllable manner has a great impact on their applications, such as the control of their deposition site, size, and morphology. [0003] At present, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/42C23C18/18B82Y40/00
CPCB82Y40/00C23C18/1612C23C18/1868C23C18/42
Inventor 姜澜李梓豪胡洁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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