Structural study on PVA assisted self-assembled 3D hierarchical iron (hydr)oxides

CrystEngComm ◽  
2018 ◽  
Vol 20 (15) ◽  
pp. 2093-2101 ◽  
Author(s):  
Yan Kong ◽  
Yuan Zhuang ◽  
Jianwei Yu ◽  
Zhiyong Han ◽  
Baoyou Shi
Keyword(s):  
Metal Oxides ◽  
Structural Study ◽  
Formation Process ◽  
Great Influence ◽  
Hydroxyl Groups ◽  
Self Assembled

Polymers with hydroxyl groups may have great influence on the formation process of metal oxides due to complexation.

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.

scholarly journals Polyoxometalates as chemically and structurally versatile components in self-assembled materials

2022 ◽  
Author(s):  
Chris Ritchie ◽  
Georgina Kate Such ◽  
Manjiri Choudhari ◽  
Yanting Gao
Keyword(s):  
Metal Oxides ◽  
Structural Motifs ◽  
Self Assembled ◽  
Composition Structure

Polyoxometalates (POMs) are anionic molecular metal oxides with expansive diversity in terms of their composition, structure, nuclearity and charge. Within this vast collection of compounds are dominant structural motifs (POM...

Structural Study of Dialkyl Sulfide Self-Assembled Monolayers on Au(111)

2002 ◽  
Vol 377 (1) ◽  
pp. 165-168 ◽  
Author(s):  
Jaegeun Noh ◽  
Fumio Nakamura ◽  
Jinyeol Kim ◽  
Haiwon Lee ◽  
Masahiko Hara
Keyword(s):  
Structural Study ◽  
Self Assembled Monolayers ◽  
Dialkyl Sulfide ◽  
Assembled Monolayers ◽  
Self Assembled

Structural study of self-assembled Co nanoparticles

2003 ◽  
Vol 94 (12) ◽  
pp. 7743 ◽  
Author(s):  
Y. Chushkin ◽  
M. Ulmeanu ◽  
S. Luby ◽  
E. Majkova ◽  
I. Kostic ◽  
...  
Keyword(s):  
Structural Study ◽  
Self Assembled ◽  
Co Nanoparticles

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.

H2 formation on Mg-rich amorphous silicates

2019 ◽  
Vol 15 (S350) ◽  
pp. 109-113
Author(s):  
Vito Mennella ◽  
Tushar Suhasaria
Keyword(s):  
Experimental Study ◽  
Infrared Spectroscopy ◽  
Formation Process ◽  
Hydroxyl Groups ◽  
Hydrogen Atoms ◽  
Photodissociation Regions ◽  
H2 Formation

AbstractWe present the results of an experimental study on the interaction of D atoms with Mg-rich amorphous silicates. The effects of D irradiation have been analyzed by infrared spectroscopy. The results indicate that HD forms by abstraction of hydrogen atoms chemisorbed in the hydroxyl groups of silicate grains. The formation process occurs for grain and atom temperatures relevant to photodissociation regions.

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