查看完整版本: Sol-gel Inks Produce Complex Shapes With Nanoscale Features

Sol-gel Inks Produce Complex Shapes With Nanoscale Features

ScienceDaily (Oct. 14, 2007) — New sol-gel inks developed by researchers at the University of Illinois can be printed into patterns to produce three-dimensional structures of metal oxides with nanoscale features.
rm{;X"d [img]http://www.sciencedaily.com/images/2007/10/071011102624.jpg[/img]
Y9Z.{-U|EyFO [i]3D micro-periodic structure. New sol-gel inks developed by researchers at the University of Illinois can be printed into patterns to produce three-dimensional structures of metal oxides with nanoscale features. (Credit: Image courtesy of University of Illinois at Urbana-Champaign)[/i]
o'sp.@H0? $ho e9u*Q
The ability to directly pattern functional oxides at the nanoscale opens a new avenue to functional devices. Potential applications include micro-fuel cells, photonic crystals and gas sensors. 0Yp NH@0W-x

[HU!V J.|/S"f%o The researchers describe the new inks in a paper accepted for publication in the journal Advanced Materials, and featured on its "Advances in Advance" Web site.
3_U&P8_Q.gl 6X5f)e-_%da
PAu"g
"Using this new family of inks, we have produced features as small as 225 nanometers," said co-author Jennifer Lewis, the Thurnauer Professor of Materials Science and Engineering and director of the university's Frederick Seitz Materials Research Laboratory (FSMRL). "Our goal is to get down to 100 nanometer feature sizes."
f(MP6F8?oC7\
I
4r-W]O([!io {r4t7H To create three-dimensional structures, the researchers use a robotic deposition process called direct-write assembly. The concentrated sol-gel ink is dispensed as a filament from a nozzle approximately 1 micron in diameter (about 100 times smaller than a human hair). The ink is dispensed while a computer-controlled micropositioner precisely directs the path. After the pattern for the first layer is complete, the nozzle is raised and another layer is deposited. This process is repeated until the desired shape is produced.
;y p.T}7D#do9V&?+B
Z:Zt"l#Bg"M8^ "We have opened direct ink writing to a new realm of functional materials," said graduate student Eric Duoss, the paper's lead author. "Since we print the desired functionality directly, the need for complicated templating and replicating schemes is eliminated."
'[+w)P dST
jw1N~,EO"Gx,cp]h Unlike previous inks, which require a liquid coagulation reservoir, the newly formulated inks are concentrated enough to rapidly solidify and maintain their shape in air, even as they span gaps in underlying layers. bFxC P(r?1bik

A8l2A \.h)G8ZMe "This gives us the ability to start, stop and reposition the flow of ink repeatedly, providing exquisite control over the deposition process," Duoss said. "For example, we can directly pattern defects in three-dimensional structures for use as photonic crystals." d-Yl*NN_R]*r3f
fv#J.tgz
After the structures have been assembled, they are converted to the desired functional oxide phase by heating at elevated temperature. Titanium dioxide, which possesses high refractive index and interesting electrical properties, is one material the researchers have successfully produced. e2wDr"ad3DW?8J

9O[ {[y(qn7b The researchers' ink design and patterning approach can be readily extended to other materials. "There are a nearly endless variety of materials to choose from," Lewis said. "We envision having a toolbox of inks that can print at the micro- and nanoscale. These inks will be used for heterogeneous integration with other manufacturing techniques to create complex, functional devices composed of many different materials."
%X#{ ^uOE#RO M"o
U ? A*uP{*ke
In addition to Lewis and Duoss, former post-doctoral researcher Mariusz Twardowski is a co-author of the paper.
US'hT5B 0X+g}"?Wl'j
Funding was provided by the U.S. Army Research Office. Part of the work was carried out in the FSMRL Center for Microanalysis of Materials, which is partially supported by the U.S. Department of Energy and the U. of I. PI"J_4P7ms%z2^ L9o
p$|rpa0iz0`
Adapted from materials provided by University of Illinois at Urbana-Champaign.

interesting

挺:) 有意思:hot1

很好，很好:lol

:victory: :victory: :victory: :victory:

:hot1 :hot1 :hot1 :hot1