Ceramic Thin Films on Organic Self-Assembled Monolayers: Synthesis and the Mechanism of Formation

1999 ◽  
Vol 599 ◽  
Author(s):  
U. Sampathkumaran ◽  
S. Supothina ◽  
R. Wang ◽  
M. R. De Guire
Keyword(s):  
Thin Films ◽  
Film Formation ◽  
Single Crystal Silicon ◽  
Surface Preparation ◽  
Inorganic Materials ◽  
Self Assembled Monolayers ◽  
Crystal Silicon ◽  
Ceramic Thin Films ◽  
Assembled Monolayers ◽  
Self Assembled

AbstractIn recent years, several research groups have pursued biomimetic or bio-inspired techniques for the synthesis of ceramic thin films from aqueous solutions at low temperatures. The substrates range from inorganic materials (metals, glass, single-crystal silicon) without special surface preparation, to functionalized organic surfaces such as self-assembled organic monolayers (SAMs). Our results on the deposition of tin (IV) oxide (SnO2, cassiterite) and hydroxyapatite (Ca10(PO4)6(OH)2) thin films on SAMs will be reviewed. The former system forms films via assembly of nano-scale particles on the substrate, while the latter system appears to form films via heterogeneous nucleation. In both cases, the role of the substrate in film formation is discussed.

Deposition of Nanocrystalline Tin (IV) Oxide Films on Organic Self-Assembled Monolayers

1999 ◽  
Vol 576 ◽  
Author(s):  
S. Supothina ◽  
M. R. De Guire ◽  
T. P. Niesen ◽  
J. Bill ◽  
F. Aldinger ◽  
...  
Keyword(s):  
Single Crystal Silicon ◽  
Self Assembled Monolayers ◽  
Crystal Silicon ◽  
Deposition Chamber ◽  
Transmission Electron ◽  
Static Solutions ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Nanocrystalline Thin Films

ABSTRACTNanocrystalline thin films of tin (IV) oxide (cassiterite) have been deposited from aqueous solutions of tin (IV) chloride and hydrochloric acid at 80°C. Substrates were {100} single-crystal silicon wafers, with and without silanol-anchored, sulfonate-terminated organic self-assembled monolayers (SAMs). Using flowing solutions, films with thicknesses of up to 1 μtm have been grown, whereas the thickness of the films from static solutions is limited to about 80 nm. The films were characterized using transmission electron microscopy and Rutherford backscattering spectroscopy. The role of the flow rate and configuration of the deposition chamber is discussed.

Preparation and Tribological Property of Novel Self-Assembled Composite Films on Silicon

2014 ◽  
Vol 936 ◽  
pp. 1066-1070
Author(s):  
Shu Hua Teng ◽  
He Pan
Keyword(s):  
Composite Films ◽  
Single Crystal Silicon ◽  
Self Assembled Monolayers ◽  
Optimal Time ◽  
Silicon Substrates ◽  
Crystal Silicon ◽  
Wear Life ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Aldehyde Groups

Self-assembled composite films of APTES-GA-APTES were successfully prepared on single-crystal silicon substrates through the cross-linking reaction between glutaraldehyde (GA) and two layers of 3-aminopropyltriethoxysilane (APTES). The optimal time to deposit the GA layer on the APTES monolayer was 3 h, during which most amino groups of APTES reacted with the aldehyde groups of GA to form smooth and uniform APTES-GA composite films. The further deposition of another APTES layer led to the generation of three-layer APTES-GA-APTES composite films. Compared to the APTES self-assembled monolayers, the three-layer films displayed a similar surface morphology but a reduced friction coefficient from 0.23 to 0.15 and an extended wear life from 50 s to 820 s due to the introduction of GA.

Synthesis and characterization of TiO2 thin films on organic self-assembled monolayers: Part I. Film formation from aqueous solutions

1995 ◽  
Vol 10 (3) ◽  
pp. 692-698 ◽  
Author(s):  
H. Shin ◽  
R.J. Collins ◽  
M.R. De Guire ◽  
A.H. Heuer ◽  
C.N. Sukenik
Keyword(s):  
Thin Films ◽  
Aqueous Solutions ◽  
Structural Integrity ◽  
Film Formation ◽  
Self Assembled Monolayers ◽  
Tio2 Thin Films ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Hydrolysis Of

Self-assembled monolayers (SAMs) bearing sulfonate (-SO3H) surface functional groups, on single-crystal Si wafers, were used as substrates for the deposition of TiO2 thin films from aqueous solutions. Polycrystalline TiO2 thin films over 50 nm thick formed in 2 h by hydrolysis of TiCl4 in aqueous HCI solutions at 80 °C. The films were pore-free, showed excellent adherence and uniformity, and consisted of anatase crystallites 2–4 nm in diameter. Annealing at temperatures up to 600 °C caused coarsening of the anatase grains, but no loss of adherence or structural integrity.

Self-assembled Monolayers Preparation and Characterization of BiFeO3 Thin Films

2009 ◽  
Vol 25 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Guo-Qiang TAN ◽  
Hai-Yang BO ◽  
Hong-Yan MIAO ◽  
Ao XIA ◽  
Zhong-Liang HE
Keyword(s):  
Thin Films ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

Nanoporous Thin Films Formed from Photocleavable Diblock Copolymers on Gold Substrates Modified with Thiolate Self-Assembled Monolayers

Langmuir ◽  
2020 ◽  
Vol 36 (31) ◽  
pp. 9259-9268 ◽  
Author(s):  
Takashi Ito ◽  
Herman Coceancigh ◽  
Yi Yi ◽  
Jay N. Sharma ◽  
Fred C. Parks ◽  
...  
Keyword(s):  
Thin Films ◽  
Diblock Copolymers ◽  
Self Assembled Monolayers ◽  
Gold Substrates ◽  
Assembled Monolayers ◽  
Self Assembled

Formation and stability of porphyrin and phthalocyanine self-assembled monolayers on ZnO surfaces

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1264-1271 ◽  
Author(s):  
Hanna Hakola ◽  
Essi Sariola-Leikas ◽  
Paavo Jäntti ◽  
Thomas Mokus ◽  
Kati Stranius ◽  
...  
Keyword(s):  
Thin Films ◽  
Zno Nanorods ◽  
Self Assembled Monolayers ◽  
Layer Formation ◽  
Zno Film ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Anchoring Groups ◽  
The Stability ◽  
Phosphate Groups

Formation of self-assembled monolayers (SAMs) of three porphyrin and one phthalocyanine derivatives on thin ZnO film was studied by monitoring absorption spectra of the samples. The compounds were equipped with carboxylic or phosphate groups to bind to the surface. The SAM formation was found to be fast. The layer was formed in less than 15 min for all studied porphyrins, and 30 min was sufficient to form phthalocyanine layer. For porphyrins with different anchor groups the SAM formation was too fast to see any difference between the anchoring groups. The stability of SAMs was tested then by immersing the samples into neat solvents. Upon immersion the SAMs were gradually losing the absorbance for all the compounds with degradation trends being in line with p[Formula: see text] values of the binding groups of the same type. However, even for the weakest binding group the SAM was relatively stable after a few tens of minutes of washing, which was sufficient to remove physisorbed compounds but the SAM was essentially not destroyed. Comparison of SAMs on thin films with SAMs on ZnO nanorods and TiO2 nanoparticle films indicated the same fast layer formation but relatively weaker SAMs stability, showing 20–40% faster absorption losses during the washing.

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