4th EucheMs chemistry congress

Poster Session 2
s1201
chem. Listy 106, s257–s1425 (2012)
Poster session 2 - solid state chemistry
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effeCt of hydroxyL denSity on
CondenSAtion BehAviorS of SeLf-ASSeMBLed
MonoLAyerS And PerforMAnCe of
PentACene-BASe orGAniC thin-fiLM
trAnSiStorS
M. y. Kuo 1 , h. C. tiAo 1
1 National Chi Nan University, Applied Chemistry, Nantou,
Taiwan
A series of self-assembled monolayers (SAMs), comprising
octadecyltrichlorosilane (ODTS), dodecyltrichlorosilane (DDTS),
and hexamethyldisilazane (HMDS), were prepared to examine the
effects of phase states and condensation behaviors of SAMs on
the morphologies and performance of pentacene-based organic
field-effect transistors (OFETs) by means of Fourier Transform
Infrared (FT-IR) spectrometer, atomic force microscope (AFM),
X-ray diffraction (XRD), and semiconductor parameter analyzer.
Experimental results reveal that the treatment of SiO substrates
2
with O plasma (denoted as O -SiO ) and the preparation
2 2 2
temperature of SAMs dramatically influence the morphologies of
SAMs and the performance of corresponding pentacene-based (no
purification) OFETs. When the SAMs were prepared at 30 °C, the
OFET based on ODTS-treated O -SiO substrate had the highest
2 2
hole mobility, reaching as large as 1.15 cm2V-1s-1 , and an on/off
current ratio in excess of 105 ; these values are both much larger
than those of a device based on ODTS-modified SiO substrates
2
without O plasma treatment and O -SiO substrates modified by
2 2 2
ODTS SAMs prepared at other temperatures. OFETs based on
O -SiO substrates that were modified by DDTS and HMDS
2 2
SAMs prepared at 4 °C performed best.
Keywords: Organic field-effect transistors; self-assembled
monolayer; pentacene; O2 plasma; preparing temperature;
4 th EucheMs chemistry congress
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deveLoPMent of wAter-BASed SoL-GeL
CoAtinGS AS AdheSion Pre-treAtMent for
ALuMiniuM SheetS
S. Meyer 1 , u. SChuBert 1
1 Vienna University of Technology, Institute of Materials
Chemistry, Vienna, Austria
Since 2000, as the chromate conversion coatings were
forbidden in the automotive and aircraft sector, much research has
been done to find a follow-up system for corrosion protection of
aluminium. Sol-gel coatings are very promising because the
precursors can be modified easily and the coatings can be tailored
for different requirements.
This work deals with the development of water-based
coatings providing a good pre-treatment for adhesive bonding as
well a good corrosion protection, even after aging under corrosive
conditions.
Based on a coating system which consists of zirconia
nanoparticles embedded in a silica network [1] made of tetraethyl
orthosilicate (TEOS) and glycidoxypropyltrimethoxysilane
(GLYMO), a water-based coating was developed. Furthermore
the replacement of zirconium by titanium was tested. This new
system was varied with regard to the aging time of the sol, ratio
of transition metal precursor and water proportion. The suitability
as adhesion pre-treatment was tested by tensile shear strength
measurements. Additionally, the aging resistance was investigated
by storing the bonded specimens in a salt spray chamber for
480 hours and testing them after this treatment. Morphological
characterization was done by SEM and the composition was
investigated by XPS.
references:
1. M.L. Zheludkevich, R. Serra, M.F. Montemor, I.M. Miranda
Salvado, M.G.S. Ferreira Surface and Coatings Technology
200 (2006) 3084–3094
Keywords: Aluminum; Sol-gel processes; Water chemistry;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc