Surface modification of ZnO on the Zn-polar 0001 face by self-assembled triptycene-based polar molecules along with an increase of electric conductance

2022 ◽  
Author(s):  
Hiroki Shioya ◽  
Naoko Inoue ◽  
Masaro Yoshida ◽  
Yoshihiro IWASA
Keyword(s):  
Surface Modification ◽  
Critical Role ◽  
Polar Molecules ◽  
Hydroxyl Groups ◽  
Oxide Semiconductors ◽  
Assembled Monolayers ◽  
Temperature Dependences ◽  
Order Of Magnitude ◽  
Sheet Conductance ◽  
Self Assembled

Abstract Application of self-assembled monolayers (SAMs) is a representative method of surface modification for tuning material properties. In this study we examine the influence of the surface modification by coating the Zn-polar 0001 surface of ZnO single crystal with a SAM of triptycene-based polar molecules in our own technique and investigated temperature dependences of the sheet conductance of the surface with and without the SAM. The sheet conductance at 70 K with the SAM is increased by an order of magnitude, compared to the case without the SAM. We infer that the additional electrons are introduced at the surface by the polar triptycene molecules, whose electropositive hydroxyl groups are supposed to face toward the Zn-polar surface of ZnO. The present result implies that the molecular orientation of the triptycene SAM plays a critical role on the surface properties of oxide semiconductors.

CHAPTER 2. Additive Manufacturing and Surface Modification of Biomaterials using Self-assembled Monolayers

2014 ◽  
pp. 30-54
Author(s):  
Jayasheelan Vaithilingam ◽  
Ruth D. Goodridge ◽  
Steven D. R. Christie ◽  
Steve Edmondson ◽  
Richard J. M. Hague
Keyword(s):  
Surface Modification ◽  
Additive Manufacturing ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

Extreme Ultraviolet-Induced Surface Modification of Self-Assembled Monolayers of Furoxans

2009 ◽  
Vol 113 (36) ◽  
pp. 16027-16030 ◽  
Author(s):  
Han-Na Hwang ◽  
Jung Sook Kim ◽  
Jung Moo Heo ◽  
Joon Won Park ◽  
Kwang-Jin Hwang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Extreme Ultraviolet ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

The Effect of Ar/H2 Plasma Pretreatments on Porous K=2.0 Dielectrics for Pore Sealing by Self-Assembled Monolayers Deposition

2012 ◽  
Vol 195 ◽  
pp. 146-149 ◽  
Author(s):  
Y. Sun ◽  
J. Swerts ◽  
P. Verdonck ◽  
A. Maheshwari ◽  
J.L. Prado ◽  
...  
Keyword(s):  
Plasma Temperature ◽  
Self Assembled Monolayers ◽  
Hydroxyl Groups ◽  
K Value ◽  
Oh Groups ◽  
Surface Hydroxyl ◽  
Pore Sealing ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Low K

Self-assembled monolayers (SAMs) deposition is being recently explored to help sealing the pores of a k=2.0 material. In order to enable a covalent chemical low-k surface functionalization by SAMs, a hydroxyl groups density as high as 1 to 2.5 OH groups/nm2 is required. This surface modification must be carefully controlled to confine the k below 10%. In this paper, the effects of plasma temperature, time and power on the SAMs deposition and plasma-induced damage are investigated. The main findings are that there is always a trade-off between surface hydroxyl groups density and bulk damage. A thick modified layer allows the SAM molecules to penetrate inside the pores which results in a decreased porosity and an increased k value with respect to correspondent plasma-treated pristine substrates.

scholarly journals Variations in the structure and reactivity of thioester functionalized self-assembled monolayers and their use for controlled surface modification

2012 ◽  
Vol 3 ◽  
pp. 213-220 ◽  
Author(s):  
Inbal Aped ◽  
Yacov Mazuz ◽  
Chaim N Sukenik
Keyword(s):  
Surface Modification ◽  
Structural Diversity ◽  
Self Assembled Monolayers ◽  
Wetting Properties ◽  
Long Term Storage ◽  
Assembled Monolayers ◽  
Important Approach ◽  
Self Assembled ◽  
Term Storage

Thioester-functionalized, siloxane-anchored, self-assembled monolayers provide a powerful tool for controlling the chemical and physical properties of surfaces. The thioester moiety is relatively stable to long-term storage and its structure can be systematically varied so as to provide a well-defined range of reactivity and wetting properties. The oxidation of thioesters with different-chain-length acyl groups allows for very hydrophobic surfaces to be transformed into very hydrophilic, sulfonic acid-bearing, surfaces. Systematic variation in the length of the polymethylene chain has also allowed us to examine how imbedding reaction sites at various depths in a densely packed monolayer changes their reactivity. π-Systems (benzene and thiophene) conjugated to the thioester carbonyl enable the facile creation of photoreactive surfaces that are able to use light of different wavelengths. These elements of structural diversity combine with the utility of the hydrophilic, strongly negatively charged sulfonate-bearing surface to constitute an important approach to systematic surface modification.

scholarly journals Colloidal silicon quantum dots: from preparation to the modification of self-assembled monolayers (SAMs) for bio-applications

2014 ◽  
Vol 43 (8) ◽  
pp. 2680-2700 ◽  
Author(s):  
Xiaoyu Cheng ◽  
Stuart B. Lowe ◽  
Peter J. Reece ◽  
J. Justin Gooding
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Self Assembled Monolayers ◽  
Silicon Quantum Dots ◽  
Recent Advances ◽  
Assembled Monolayers ◽  
Self Assembled

Summarizes recent advances in the preparation, surface modification and bio-applications of silicon quantum dots.

Surface Modification of Self-Assembled Monolayers for Organic Transistors

2013 ◽  
Author(s):  
S. Ito ◽  
S.W. Lee ◽  
T. Yokota ◽  
T. Tokuhara ◽  
H. Klauk ◽  
...  
Keyword(s):  
Surface Modification ◽  
Self Assembled Monolayers ◽  
Organic Transistors ◽  
Assembled Monolayers ◽  
Self Assembled
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