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Controllable assembly of silver nanoparticles induced by femtosecond laser direct writing

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ABSTRACT

We report controllable assembly of silver nanoparticles (Ag NPs) for patterning of silver microstructures. The assembly is induced by femtosecond laser direct writing (FsLDW). A tightly focused femtosecond laser beam is capable of trapping and driving Ag NPs to form desired micropatterns with a high resolution of ∼190 nm. Taking advantage of the ‘direct writing’ feature, three microelectrodes have been integrated with a microfluidic chip; two silver-based microdevices including a microheater and a catalytic reactor have been fabricated inside a microfluidic channel for chip functionalization. The FsLDW-induced programmable assembly of Ag NPs may open up a new way to the designable patterning of silver microstructures toward flexible fabrication and integration of functional devices.

No MeSH data available.


(a) SEM image of a silver word (MICRO) fabricated by FsLDW-induced controllable assembly of Ag NPs. (b) SEM image of the letter R. (c) AFM image of the silver word (MICRO). (d) Height profile measured along the white line shown in (c).
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Figure 4: (a) SEM image of a silver word (MICRO) fabricated by FsLDW-induced controllable assembly of Ag NPs. (b) SEM image of the letter R. (c) AFM image of the silver word (MICRO). (d) Height profile measured along the white line shown in (c).

Mentions: To illustrate its full potential in flexible patterning, a word (MICRO) was successfully fabricated through FsLDW of Ag NPs. Figures 4(a) and (b) show SEM images of the MICRO pattern and the letter ‘R’, respectively. The average line width of these letters is measured to be ∼2 μm. To get further insight into the surface morphology of these letters, they were characterized by AFM. As shown in figure 4(c), MICRO could be clearly indentified from the image, in good agreement with the SEM image (figure 4(a)). The profile of the micropattern was also measured along a white line in figure 4(c). The micropattern is about 50 nm in thickness. Notably, the surface of the micropattern is very rough; its surface roughness (Rq) is measured to be about 11 nm. The rough surface could be attributed to the close packing of silver particles. Considering the rough surface, silver electrodes fabricated using this method may find some applications in electroanalysis.


Controllable assembly of silver nanoparticles induced by femtosecond laser direct writing
(a) SEM image of a silver word (MICRO) fabricated by FsLDW-induced controllable assembly of Ag NPs. (b) SEM image of the letter R. (c) AFM image of the silver word (MICRO). (d) Height profile measured along the white line shown in (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC5036472&req=5

Figure 4: (a) SEM image of a silver word (MICRO) fabricated by FsLDW-induced controllable assembly of Ag NPs. (b) SEM image of the letter R. (c) AFM image of the silver word (MICRO). (d) Height profile measured along the white line shown in (c).
Mentions: To illustrate its full potential in flexible patterning, a word (MICRO) was successfully fabricated through FsLDW of Ag NPs. Figures 4(a) and (b) show SEM images of the MICRO pattern and the letter ‘R’, respectively. The average line width of these letters is measured to be ∼2 μm. To get further insight into the surface morphology of these letters, they were characterized by AFM. As shown in figure 4(c), MICRO could be clearly indentified from the image, in good agreement with the SEM image (figure 4(a)). The profile of the micropattern was also measured along a white line in figure 4(c). The micropattern is about 50 nm in thickness. Notably, the surface of the micropattern is very rough; its surface roughness (Rq) is measured to be about 11 nm. The rough surface could be attributed to the close packing of silver particles. Considering the rough surface, silver electrodes fabricated using this method may find some applications in electroanalysis.

View Article: PubMed Central - PubMed

ABSTRACT

We report controllable assembly of silver nanoparticles (Ag NPs) for patterning of silver microstructures. The assembly is induced by femtosecond laser direct writing (FsLDW). A tightly focused femtosecond laser beam is capable of trapping and driving Ag NPs to form desired micropatterns with a high resolution of ∼190 nm. Taking advantage of the ‘direct writing’ feature, three microelectrodes have been integrated with a microfluidic chip; two silver-based microdevices including a microheater and a catalytic reactor have been fabricated inside a microfluidic channel for chip functionalization. The FsLDW-induced programmable assembly of Ag NPs may open up a new way to the designable patterning of silver microstructures toward flexible fabrication and integration of functional devices.

No MeSH data available.