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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) TEM image of the as-obtained Ag NPs. The inset is the particle size distribution of the Ag NPs. (b) SAED pattern of the Ag NPs. (c) HRTEM image of a single Ag NP, (200) planes of the Ag NP with a d spacing of 0.2 nm could be observed.
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Figure 1: (a) TEM image of the as-obtained Ag NPs. The inset is the particle size distribution of the Ag NPs. (b) SAED pattern of the Ag NPs. (c) HRTEM image of a single Ag NP, (200) planes of the Ag NP with a d spacing of 0.2 nm could be observed.

Mentions: In this work, malate-capped Ag NPs were used for the FsLDW fabrication. To evaluate the quality of the Ag NP suspension, the obtained Ag NPs were characterized by TEM. As shown in figure 1, the Ag NPs are uniform in size and their average diameter is 2.5 nm (inset of figure 1(a)). Figure 1(b) shows a selected area electron diffraction (SAED) pattern of the Ag NPs, indicating their crystalline structures. This was further confirmed by the high-resolution transmission electron microscopy (HRTEM) image (figure 1(c)), in which the (200) planes of Ag NPs with a spacing of 0.20 nm could be clearly observed.


Controllable assembly of silver nanoparticles induced by femtosecond laser direct writing
(a) TEM image of the as-obtained Ag NPs. The inset is the particle size distribution of the Ag NPs. (b) SAED pattern of the Ag NPs. (c) HRTEM image of a single Ag NP, (200) planes of the Ag NP with a d spacing of 0.2 nm could be observed.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: (a) TEM image of the as-obtained Ag NPs. The inset is the particle size distribution of the Ag NPs. (b) SAED pattern of the Ag NPs. (c) HRTEM image of a single Ag NP, (200) planes of the Ag NP with a d spacing of 0.2 nm could be observed.
Mentions: In this work, malate-capped Ag NPs were used for the FsLDW fabrication. To evaluate the quality of the Ag NP suspension, the obtained Ag NPs were characterized by TEM. As shown in figure 1, the Ag NPs are uniform in size and their average diameter is 2.5 nm (inset of figure 1(a)). Figure 1(b) shows a selected area electron diffraction (SAED) pattern of the Ag NPs, indicating their crystalline structures. This was further confirmed by the high-resolution transmission electron microscopy (HRTEM) image (figure 1(c)), in which the (200) planes of Ag NPs with a spacing of 0.20 nm could be clearly observed.

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.