Preparation method and application of a multipole localized surface plasmon resonance absorber
A plasmon resonance and localized surface technology, applied in the field of photothermal conversion of nano-absorbers, can solve the problems of difficult improvement of light absorption characteristics and limited absorption spectrum coverage, and achieve excellent comprehensive photothermal performance and broaden the range of light absorption , The effect of improving the light absorption characteristics
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Embodiment 1
[0052] Example 1: Preparation of α-Fe 2 O 3 Nanoparticles (hematite nanorice)
[0053] Configured with 20mM FeCl 3 Aqueous solution 100ml, add pH buffer KH 2 PO 4 Make the KH in the reaction solution 2 PO 4 The concentration of the solution was 400 μM, and the reaction solution was stirred evenly and reacted at 100±2°C for 72h. After the reaction was completed, the product was isolated by centrifugation, washed three times with deionized water, and then washed with absolute ethanol for 1-2 times. The washed samples were dried in an oven, α-Fe 2 O 3 The nanometer grain powder is sealed and stored. α-Fe 2 O 3 Scanning Electron Microscopy (SEM) images of nanoparticles are shown in figure 1 (a,b) and image 3 (a-c), α-Fe 2 O 3 The reaction can be scaled up 3-4 times during nanoparticle preparation.
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 Nanometer grains have strong stability, acid and alkali resistance, temperature resistance and reduction resistance. The long-term storage stability is that the powder (or dispersion) can be stored for more than 16 months. ) diagram 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 are grown on nanoparticles, combining the excellent localized surface plasmon resonance properties of Ag nanostructured materials with α-Fe 2 O 3 Nanoparticle compounding to produce absorbers with broad absorption properties. During the preparation of multipole localized surface plasmon resonance absorbers, α-Fe 2 O 3 Nanoparticle-loaded silver nanocrystal growth points and shell epitaxial growth need to be carried out in weakly acidic and stro...
Embodiment 3
[0057] Example 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 The nanometer rice powder was dispersed in 60ml deionized water, stirred evenly, and added 60ml, 0.15M SnCl 2 , stir well and add 600 μl of concentrated hydrochloric acid. Stir quickly for 5-10min, and then slowly stir for 30min to make α-Fe 2 O 3 Sufficient adsorption of sensitizer SnCl on the surface of nanometer particles 2 Sn in 2+ . The reaction solution was centrifuged, washed 3-5 times with deionized water, and then dispersed in 60 ml of deionized water to obtain α-Fe 2 O 3 -Sn 2+ solution.
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