Third Day Poster Session, 17 June 2010 - NanoTR-VI

P
Poster Session, Thursday, June 17
Theme F686 - N1123
Microwave-Assisted Deposition of Microwire Patterns of Metal Nanoparticles
1
UUursoy OlgunUP P*
1
PDepartment of Chemistry, Sakarya University, Sakarya 54187, Turkey
Abstract-Nanoparticles were self-assembled as organized microwire patterns on various substrates due to the stick-slip motion of the contact
line during the microwave evaporation of solvent. The colloid solutions of 0.03% (w/v) nanoaluminum in 10% (v/v) poly(dimethylsiloxane)-
acetone were used to self-assemble the microwire patterns of Al on glass substrates, which were dipped into the solution and held against the
wall. Also, the colloids of 0.001% (w/v) nanosilver prepared in acetone solution of 33.3% (v/v) chloroform, 16.6% (v/v)
poly(dimethylsiloxane) and 0.3% (v/v) Tween-20 were utilized for the deposition of the microwire patterns under the microwave heating at
51-55 °C. The rapid self-assembly process was demonstrated under the microwave and the width of microwires was about 1-20 m depending
on the concentration of the nanoparticles. Processing of particles to produce surface patterns and their thin films will be presented.
The microwave-assisted self-organization of colloidal
particles in confining aqueous droplets was reported for the
preparation of photonic band gap materials [1]. The
microwave-assisted synthesis and the in-situ self-assembly of
coaxial Ag/C nanocables have been studied [2]. Although the
microwave synthesis of metal nanoparticles has been studied
in the literature, the microwave processing of the colloids of
metal nanoparticles has not been investigated in detail. The
evaporation induced self-assembly of zeolite patterns was
reported at room temperature recently [3].
Here, the deposition of aluminum and silver microwires was
directed by the evaporation-induced self-assembly of
nanoparticles under the microwave heating [4]. Compared to
the conventional heating, the microwave radiation had many
advantages, such as very short time heating, homogeneous
energy transfer to the liquid and reduced bubble formation in
solution. The formation of microwire patterns was due to the
stick-slip dynamics of the contact line on the surface of the
substrates. By using the microwave energy, the rapid selfassembly
of the microwires from the metal nanoparticles was
achieved within a few minutes for the first time.
The contact line deposition of nanoparticles has been studied
by several groups to prepare micropatterns of various
materials. In this study, the effects of using microwave heating
were explored for the first time to accelerate the particle
deposition process. As shown in Figure 1, the role of
microwave during the stick-slip motion of contact line was
Figure 2: The images of nanoaluminum and nanosilver
microwire patterns deposited on glass substrates at 55 C under
microwave heating [4].
20 °C without heating, at 40 °C with conventional heating and
at 55 °C with microwave heating. As demonstrated in Figure
2, the microwire patterns produced using the microwave
heating are very different for nano Al and Ag particles [4].
In summary, it was demonstrated that the colloidal selfassembly
of particles under microwave is an efficient method
to produce micropatterns of nanoparticles. The microwire
deposition process presented in this study is relatively simple
compare to the previous patterning techniques. The use of
photoresist layer, micropatterned mask, monolayer coating
and molded patterns is not required. As a result of these
findings, it was concluded that the colloids of aluminum and
silver nanoparticles are suitable for the rapid self-assembly of
the microwire patterns under the microwave heating.
*Corresponding author: HTuolgun@sakarya.edu.trT
Figure 1. The mechanism of microwire deposition demonstrated by
the stick-slip dynamics of the contact line [4].
investigated using the colloids of nano Al and Ag particles.
The colloid solutions of 0.03%(w/v) nanoaluminum
containing 10%(v/v) PDMS were placed in glass vials and the
deposition of microwires on the wall surface was carried out at
[1] S.H. Kim, S.Y. Lee, G.R. Yi, D.J. Pine, S.M. Yang, J. Am. Chem.
Soc. 128, 10897, (2006).
[2] J.C. Yu, X.L. Hu, L.B. Quan, L.Z. Zhang, Chem. Commun. 21,
2704, (2005).
[3] U. Olgun, V. Sevinç, Powder Tech. 183, 207, (2008).
[4] U.Olgun. ACS Appl. Mater. Interfaces. 2(1), 28, (2010).
6th Nanoscience and Nanotechnology Conference, zmir, 2010 653