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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.


SEM images (a)–(c) and corresponding optical images (d)–(f) of three kinds of silver microelectrodes integrated with a microfluidic device. (a), (d) Interdigital electrode, (b), (e) two-electrode system, and (c), (f) MEA.
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Figure 5: SEM images (a)–(c) and corresponding optical images (d)–(f) of three kinds of silver microelectrodes integrated with a microfluidic device. (a), (d) Interdigital electrode, (b), (e) two-electrode system, and (c), (f) MEA.

Mentions: To demonstrate the capability of integrating such silver micropatterns with given microdevices, three kinds of microelectrodes were successfully integrated within a microfluidic chip by FsLDW-induced controllable assembly of Ag NPs (figure 5). As typical examples, a pair of interdigital electrodes, and a ring-circle working-counter electrode have been patterned. Note that both the two electrodes are widely used in electroanalysis for current/impedance detection; FsLDW-induced controllable assembly of Ag NPs may find broad application in highly sensitive electroanalysis, especially for bioelectricity signal collection. In this case, microelectrode arrays (MEAs), whose sizes were similar to cells, have been fabricated, as shown in figures 5(c) and (f). Independent electrodes in MEAs could be utilized to collect potential signals transferring in organisms, or collect signals at different points from the same cells.


Controllable assembly of silver nanoparticles induced by femtosecond laser direct writing
SEM images (a)–(c) and corresponding optical images (d)–(f) of three kinds of silver microelectrodes integrated with a microfluidic device. (a), (d) Interdigital electrode, (b), (e) two-electrode system, and (c), (f) MEA.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: SEM images (a)–(c) and corresponding optical images (d)–(f) of three kinds of silver microelectrodes integrated with a microfluidic device. (a), (d) Interdigital electrode, (b), (e) two-electrode system, and (c), (f) MEA.
Mentions: To demonstrate the capability of integrating such silver micropatterns with given microdevices, three kinds of microelectrodes were successfully integrated within a microfluidic chip by FsLDW-induced controllable assembly of Ag NPs (figure 5). As typical examples, a pair of interdigital electrodes, and a ring-circle working-counter electrode have been patterned. Note that both the two electrodes are widely used in electroanalysis for current/impedance detection; FsLDW-induced controllable assembly of Ag NPs may find broad application in highly sensitive electroanalysis, especially for bioelectricity signal collection. In this case, microelectrode arrays (MEAs), whose sizes were similar to cells, have been fabricated, as shown in figures 5(c) and (f). Independent electrodes in MEAs could be utilized to collect potential signals transferring in organisms, or collect signals at different points from the same cells.

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.