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Preparation method and application of multi-pole sub-local area surface plasma resonance absorber

A technology of plasmon resonance and localized surface, which is applied in the field of light-to-heat conversion of nano-absorbers, can solve the problems of difficult improvement of light absorption characteristics and limited coverage of absorption spectrum, and achieve the effect of strong stability

Active Publication Date: 2020-06-12
王海龙
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] To improve the photothermal conversion performance, the key is to improve the light absorption characteristics of the absorber, including the absorption intensity and the absorption range of the absorption spectrum. This is the best way to improve the photothermal conversion performance from the source, but the light absorption characteristics of a single absorber are very different. Difficult to improve
Since the absorption spectrum of a single-structure LSPR absorber is usually one or several isolated absorption peaks, the coverage of the absorption spectrum is limited. For the regulation of the light absorption characteristics of the localized surface plasmon resonance absorber, the main control of the absorber is currently Absorption peak position, although the absorption peak position of the LSPR absorber can be adjusted in a wide range from the ultraviolet-visible-near-infrared light region, there is no effective and feasible method to broaden the absorption spectrum range of a single absorber

Method used

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  • Preparation method and application of multi-pole sub-local area surface plasma resonance absorber
  • Preparation method and application of multi-pole sub-local area surface plasma resonance absorber
  • Preparation method and application of multi-pole sub-local area surface plasma resonance absorber

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Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1: Preparation of α-Fe 2 o 3 Nanoparticles (hematite nanorice)

[0053] Configure 20mM FeCl 3 Aqueous solution 100ml, add pH buffer KH 2 PO 4 KH in the reaction solution 2 PO 4 The concentration is 400 μM, and the reaction solution is stirred evenly and then reacted at 100±2° C. for 72 hours. After the reaction is completed, the product is separated by centrifugation, washed 3 times with deionized water, and then washed 1-2 times with absolute ethanol. The washed samples were dried in an oven, α-Fe 2 o 3 The nanometer grain powder is sealed and preserved. α-Fe 2 o 3 Scanning electron microscope (SEM) images of nanoparticles see figure 1 (a,b) and image 3 (a-c), α-Fe 2 o 3 The reaction can be expanded by 3-4 times during the preparation of nanoparticles.

Embodiment 2

[0054] Example 2: α-Fe 2 o 3 Stability, acid and alkali resistance, temperature resistance and reduction resistance of nanoparticles

[0055] α-Fe 2 o 3 Nano rice particles have strong stability, acid and alkali resistance, temperature resistance and reduction resistance. The long-term storage stability is as follows: its powder (or dispersion) can be stored for more than 16 months, and its scanning electron microscope (SEM ) figure is basically unchanged, see figure 1 (c,d). The present invention uses α-Fe 2 o 3 Nanoparticles as the matrix, in α-Fe 2 o 3 Ag nanostructures were grown on nanoparticles, and the excellent localized surface plasmon resonance characteristics of Ag nanostructure materials combined with α-Fe 2 o 3 Nanoparticles are compounded to prepare absorbers with broad absorption characteristics. During the preparation of multipole localized surface plasmon resonance absorbers, α-Fe 2 o 3 Nanoparticle-loaded silver nanocrystal growth points and shel...

Embodiment 3

[0057] Embodiment 3: Preparation of α-Fe 2 o 3 -Sn 2+

[0058] α-Fe 2 o 3 -Sn 2+ Preparation, take 0.6g α-Fe 2 o 3 Disperse nanometer rice powder in 60ml deionized water, stir evenly, add 60ml, 0.15M SnCl 2 , Stir well and add 600 μl concentrated hydrochloric acid. Stir rapidly for 5-10min, then stir slowly for 30min to make α-Fe 2 o 3 Sufficient adsorption of sensitizer SnCl on the surface of nanoparticles 2 Sn in 2+ . The reaction solution was centrifuged, washed with deionized water for 3-5 times, and then dispersed in 60ml deionized water to obtain α-Fe 2 o 3 -Sn 2+ solution.

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Abstract

The invention discloses a preparation method and application of a multi-pole sub-local area surface plasma resonance absorber. By improving the preparation method of a core shell, the light absorbingcharacteristic of the single nano absorber is improved through a nano composite core shell structure material, and the obtained single multi-pole sub-local area surface plasma resonance absorber has four plasma resonance absorbing peaks within the range of 200-1,300 nm, the absorbing spectrum of the absorber is broadened, the problem that the light absorbing characteristic of the single absorber is difficult to improve is solved, a new method for improving the light absorbing characteristic of the single absorber is created, and a feasible strategy is provided for how to improve the light absorbing characteristic of the single absorber; meanwhile, the comprehensive photothermal performance of the multi-pole sub-local surface plasma resonance absorber is excellent, the sunlight with low energy density can be efficiently captured, high-temperature overheating and photothermal steam can be rapidly and efficiently generated, and the problem that it is difficult to generate high-temperature, fast and efficient photothermal steam at the same time by the photothermal conversion is solved.

Description

Technical field: [0001] The invention relates to the technical field of light-to-heat conversion of nano absorbers, in particular to a preparation method and application of a multi-pole localized surface plasmon resonance absorber. Background technique: [0002] At present, the Localized Surface Plasmon Resonance (LSPR) of noble metal nanostructure materials has a strong field enhancement effect. The energy is transferred to the surrounding medium in a very short time, and the hot spot acts as a heat source to drive the rapid vaporization phase transition of the surrounding medium, which can convert electromagnetic energy into thermal energy in a very short time (100ps to 10ns). At the same time, the light-to-heat conversion of the LSPR absorber only heats the medium around the hot spot, which has a strong locality, so the LSPR absorber can generate high-temperature photothermal vapor. Although the absorption spectrum of the LSPR absorber can be adjusted in a wide range and...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B22F1/00C01G49/06B82Y40/00B82Y30/00
CPCB22F9/24C01G49/06B82Y30/00B82Y40/00C01P2004/03C01P2004/61B22F1/0553B22F1/07B22F1/054B22F1/17Y02P20/10
Inventor 王海龙刘曼
Owner 王海龙
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