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Femtosecond laser rapid fabrication of large-area rose-like micropatterns on freestanding flexible graphene films.

Shi X, Li X, Jiang L, Qu L, Zhao Y, Ran P, Wang Q, Cao Q, Ma T, Lu Y - Sci Rep (2015)

Bottom Line: This unique hierarchical layering structure of graphene films provides great possibilities for generation of tensile stress during femtosecond laser ablation to roll up the nanoflakes, which contributes to the formation of microflowers.More importantly, this technique enables fabrication of the large-area patterned surfaces at centimeter scales in a simple and efficient way.This study not only presents new insights of ultrafast laser processing of novel graphene-based materials but also shows great promise of designing new materials combined with ultrafast laser surface patterning for future applications in functional coatings, sensors, actuators and microfluidics.

View Article: PubMed Central - PubMed

Affiliation: Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China.

ABSTRACT
We developed a simple, scalable and high-throughput method for fabrication of large-area three-dimensional rose-like microflowers with controlled size, shape and density on graphene films by femtosecond laser micromachining. The novel biomimetic microflower that composed of numerous turnup graphene nanoflakes can be fabricated by only a single femtosecond laser pulse, which is efficient enough for large-area patterning. The graphene films were composed of layer-by-layer graphene nanosheets separated by nanogaps (~10-50 nm), and graphene monolayers with an interlayer spacing of ~0.37 nm constituted each of the graphene nanosheets. This unique hierarchical layering structure of graphene films provides great possibilities for generation of tensile stress during femtosecond laser ablation to roll up the nanoflakes, which contributes to the formation of microflowers. By a simple scanning technique, patterned surfaces with controllable densities of flower patterns were obtained, which can exhibit adhesive superhydrophobicity. More importantly, this technique enables fabrication of the large-area patterned surfaces at centimeter scales in a simple and efficient way. This study not only presents new insights of ultrafast laser processing of novel graphene-based materials but also shows great promise of designing new materials combined with ultrafast laser surface patterning for future applications in functional coatings, sensors, actuators and microfluidics.

No MeSH data available.


Related in: MedlinePlus

Morphology and structure of graphene film.(a) Low-, (b) middle-, and (c) high-resolution TEM cross-sectional images of the graphene film, which were obtained under a 300 keV electron beam. The arrows in (b) indicate the nanogaps of ~10–50 nm. The inset in (c) shows an image of the highest resolution. (d) SEM image of the fracture edge of the graphene film. (e) Schematic drawing of the structure of the graphene film.
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f2: Morphology and structure of graphene film.(a) Low-, (b) middle-, and (c) high-resolution TEM cross-sectional images of the graphene film, which were obtained under a 300 keV electron beam. The arrows in (b) indicate the nanogaps of ~10–50 nm. The inset in (c) shows an image of the highest resolution. (d) SEM image of the fracture edge of the graphene film. (e) Schematic drawing of the structure of the graphene film.

Mentions: The characteristic structure of the as-prepared graphene film was investigated by TEM and SEM, as shown in Fig. 2. Under the lowest magnification (Fig. 2a), it can be seen that the graphene film has a thickness of ~12 μm with front and back free surfaces. For a higher magnification (Fig. 2b), the nanogaps (indicated by the arrows) of ~10–50 nm among the graphene nanosheets can be clearly observed. With the highest magnification, well-stacked graphene monolayers can be observed in Fig. 2c, showing an interlayer spacing of ~0.37 nm, larger than that of typical graphite. Figure 2d shows SEM image of the fracture edge of the graphene film. According to the results of characterizations, the unique structure of the graphene film is schematically shown in Fig. 2e. The graphene film exhibits both nanoscale and sub-nanoscale structures. The nanoscale structure consists of graphene nanosheets, which are separated by randomly distributed nanogaps of ~10–50 nm. Each graphene nanosheet is composed of well-stacked graphene monolayers with an average interlayer spacing of ~0.37 nm. The aforementioned structure of graphene film presumably has significant effects on the subsequent fs laser ablation process (see details in the Discussion).


Femtosecond laser rapid fabrication of large-area rose-like micropatterns on freestanding flexible graphene films.

Shi X, Li X, Jiang L, Qu L, Zhao Y, Ran P, Wang Q, Cao Q, Ma T, Lu Y - Sci Rep (2015)

Morphology and structure of graphene film.(a) Low-, (b) middle-, and (c) high-resolution TEM cross-sectional images of the graphene film, which were obtained under a 300 keV electron beam. The arrows in (b) indicate the nanogaps of ~10–50 nm. The inset in (c) shows an image of the highest resolution. (d) SEM image of the fracture edge of the graphene film. (e) Schematic drawing of the structure of the graphene film.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663466&req=5

f2: Morphology and structure of graphene film.(a) Low-, (b) middle-, and (c) high-resolution TEM cross-sectional images of the graphene film, which were obtained under a 300 keV electron beam. The arrows in (b) indicate the nanogaps of ~10–50 nm. The inset in (c) shows an image of the highest resolution. (d) SEM image of the fracture edge of the graphene film. (e) Schematic drawing of the structure of the graphene film.
Mentions: The characteristic structure of the as-prepared graphene film was investigated by TEM and SEM, as shown in Fig. 2. Under the lowest magnification (Fig. 2a), it can be seen that the graphene film has a thickness of ~12 μm with front and back free surfaces. For a higher magnification (Fig. 2b), the nanogaps (indicated by the arrows) of ~10–50 nm among the graphene nanosheets can be clearly observed. With the highest magnification, well-stacked graphene monolayers can be observed in Fig. 2c, showing an interlayer spacing of ~0.37 nm, larger than that of typical graphite. Figure 2d shows SEM image of the fracture edge of the graphene film. According to the results of characterizations, the unique structure of the graphene film is schematically shown in Fig. 2e. The graphene film exhibits both nanoscale and sub-nanoscale structures. The nanoscale structure consists of graphene nanosheets, which are separated by randomly distributed nanogaps of ~10–50 nm. Each graphene nanosheet is composed of well-stacked graphene monolayers with an average interlayer spacing of ~0.37 nm. The aforementioned structure of graphene film presumably has significant effects on the subsequent fs laser ablation process (see details in the Discussion).

Bottom Line: This unique hierarchical layering structure of graphene films provides great possibilities for generation of tensile stress during femtosecond laser ablation to roll up the nanoflakes, which contributes to the formation of microflowers.More importantly, this technique enables fabrication of the large-area patterned surfaces at centimeter scales in a simple and efficient way.This study not only presents new insights of ultrafast laser processing of novel graphene-based materials but also shows great promise of designing new materials combined with ultrafast laser surface patterning for future applications in functional coatings, sensors, actuators and microfluidics.

View Article: PubMed Central - PubMed

Affiliation: Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, PR China.

ABSTRACT
We developed a simple, scalable and high-throughput method for fabrication of large-area three-dimensional rose-like microflowers with controlled size, shape and density on graphene films by femtosecond laser micromachining. The novel biomimetic microflower that composed of numerous turnup graphene nanoflakes can be fabricated by only a single femtosecond laser pulse, which is efficient enough for large-area patterning. The graphene films were composed of layer-by-layer graphene nanosheets separated by nanogaps (~10-50 nm), and graphene monolayers with an interlayer spacing of ~0.37 nm constituted each of the graphene nanosheets. This unique hierarchical layering structure of graphene films provides great possibilities for generation of tensile stress during femtosecond laser ablation to roll up the nanoflakes, which contributes to the formation of microflowers. By a simple scanning technique, patterned surfaces with controllable densities of flower patterns were obtained, which can exhibit adhesive superhydrophobicity. More importantly, this technique enables fabrication of the large-area patterned surfaces at centimeter scales in a simple and efficient way. This study not only presents new insights of ultrafast laser processing of novel graphene-based materials but also shows great promise of designing new materials combined with ultrafast laser surface patterning for future applications in functional coatings, sensors, actuators and microfluidics.

No MeSH data available.


Related in: MedlinePlus