Electrochemical layer by layer growth and characterization of copper sulfur thin films on Ag(111)

2011 ◽  
Vol 58 ◽  
pp. 599-605 ◽  
Author(s):  
M. Innocenti ◽  
I. Bencistà ◽  
S. Bellandi ◽  
C. Bianchini ◽  
F. Di Benedetto ◽  
...  
Keyword(s):  
Thin Films ◽  
Layer Growth ◽  
Layer By Layer

Ordered Thin Films of Perylenetetracarboxylicdianhydride-bisimide and bis-(N-alkyl)-Quinacridone Dyes

2000 ◽  
Vol 620 ◽  
Author(s):  
Andrew Back ◽  
Dana Alloway ◽  
Derck Schlettwein ◽  
Brook Schilling ◽  
J.-F. Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Alkali Halides ◽  
Layer Growth ◽  
Ex Situ ◽  
Layer By Layer ◽  
Molecular Plane ◽  
Layered Growth ◽  
Tapping Mode Afm

ABSTRACTWe review here the recent characterization of vacuum deposited monolayer and multilayer thin films of two different perylenetetracarboxylic-dianydride-bisimides (Cn-PTCDI; n =4,5), quinacridone, and two new bis-(N-alkyl)-quinacridone dyes (DIQA and DEHQA) on single crystal alkali halides using a combination of in situ luminescence spectroscopies and ex situ tapping mode AFM. Flat lying monolayer structures are indicated for PTCDA on the (100) faces of NaCl, KCl and KBr, for C4-PTCDI on KCl, for C5-PTCDI on both KCl and KBr and for DIQA on both KCl and KBr. Coherent thin films, exhibiting layer-by-layer growth can be achieved for PTCDA on all substrates, for C4-PTCDI on KCl and for DIQA on both KBr and KCl. Both C4-PTCDI and DIQA appear to fulfill the requirements for dyes which exhibit layered growth with the molecular plane inclined at steep angles to the surface normal.

scholarly journals Modeling the Layer-by-Layer Growth of HKUST-1 Metal-Organic Framework Thin Films

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1631
Author(s):  
Qiang Zhang ◽  
Yohanes Pramudya ◽  
Wolfgang Wenzel ◽  
Christof Wöll
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Deposition Rate ◽  
Layer Growth ◽  
Coarse Grained ◽  
Structural Defects ◽  
Effect Of Temperature ◽  
Layer By Layer ◽  
Reactant Concentration ◽  
Metal Organic

Metal organic frameworks have emerged as an important new class of materials with many applications, such as sensing, gas separation, drug delivery. In many cases, their performance is limited by structural defects, including vacancies and domain boundaries. In the case of MOF thin films, surface roughness can also have a pronounced influence on MOF-based device properties. Presently, there is little systematic knowledge about optimal growth conditions with regard to optimal morphologies for specific applications. In this work, we simulate the layer-by-layer (LbL) growth of the HKUST-1 MOF as a function of temperature and reactant concentration using a coarse-grained model that permits detailed insights into the growth mechanism. This model helps to understand the morphological features of HKUST-1 grown under different conditions and can be used to predict and optimize the temperature for the purpose of controlling the crystal quality and yield. It was found that reactant concentration affects the mass deposition rate, while its effect on the crystallinity of the generated HKUST-1 film is less pronounced. In addition, the effect of temperature on the surface roughness of the film can be divided into three regimes. Temperatures in the range from 10 to 129 °C allow better control of surface roughness and film thickness, while film growth in the range of 129 to 182 °C is characterized by a lower mass deposition rate per cycle and rougher surfaces. Finally, for T larger than 182 °C, the film grows slower, but in a smooth fashion. Furthermore, the potential effect of temperature on the crystallinity of LbL-grown HKUST-1 was quantified. To obtain high crystallinity, the operating temperature should preferably not exceed 57 °C, with an optimum around 28 °C, which agrees with experimental observations.

Direct Layer-by-Layer Growth of Crystalline Ag-TCNQ Thin Films on Functionalized Au Substrate: How Critical Is the pH of Ag(I) Solution?

2020 ◽  
Vol 11 (24) ◽  
pp. 10548-10551
Author(s):  
Aswani Sathish Lathika ◽  
Shammi Rana ◽  
Anupam Prasoon ◽  
Pooja Sindhu ◽  
Debashree Roy ◽  
...  
Keyword(s):  
Thin Films ◽  
Layer Growth ◽  
Layer By Layer

Fabrication of [Cu2(bdc)2(bpy)]n thin films using coordination modulation-assisted layer-by-layer growth

CrystEngComm ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 1546-1552 ◽  
Author(s):  
Ruhollah Khajavian ◽  
Kamal Ghani
Keyword(s):  
Thin Films ◽  
Layer Growth ◽  
Modulation Method ◽  
Layer By Layer

We take the advantage of the layer-by-layer process to adapt it to the coordination modulation method to fabricate highly oriented [Cu2(bdc)2(bpy)]n films.

Layer-by-Layer Growth Control of Metal–Organic Framework Thin Films Assembled on Polymer Films

2020 ◽  
Vol 12 (45) ◽  
pp. 50784-50792
Author(s):  
Hiroaki Ohara ◽  
Shunsuke Yamamoto ◽  
Daiki Kuzuhara ◽  
Tomoyuki Koganezawa ◽  
Hidetoshi Oikawa ◽  
...  
Keyword(s):  
Thin Films ◽  
Polymer Films ◽  
Metal Organic Framework ◽  
Growth Control ◽  
Layer Growth ◽  
Layer By Layer ◽  
Metal Organic ◽  
Organic Framework

Atomic Layer and Unit-Cell Layer Growth of (Ca,Sr)CuO2 and Bi2Sr2Can-1CunO2n+4 Thin Films by Laser Molecular Bean Epitaxy

1991 ◽  
Vol 222 ◽  
Author(s):  
Masaki Kanai ◽  
Tomoji Kawai ◽  
Takuya Matsumoto ◽  
Shichio Kawai
Keyword(s):  
Thin Films ◽  
Diffraction Pattern ◽  
Cell Layer ◽  
Atomic Layer ◽  
High Energy ◽  
Layer Growth ◽  
Unit Cell ◽  
Layer By Layer ◽  
Diffraction Intensity

ABSTRACTThin films of (Ca,Sr)CuO2 and Bi2Sr2Can-1CunO2n+4 are formed by laser molecular beam epitaxy with in-situ reflection high energy electron diffraction observation. The diffraction pattern shows that these materials are formed with layer-by-layer growth. The change of the diffraction intensity as well as the analysis of the total diffraction pattern makes It possible to control the grown of the atomic layer or the unit-cell layer.

scholarly journals Electrostatic Design of Polar Metal–Organic Framework Thin Films

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2420
Author(s):  
Giulia Nascimbeni ◽  
Christof Wöll ◽  
Egbert Zojer
Keyword(s):  
Thin Films ◽  
Electrostatic Potential ◽  
Energy Gap ◽  
Dipole Moments ◽  
Metal Organic Framework ◽  
Solid Substrate ◽  
Layer Growth ◽  
Layer By Layer ◽  
Metal Organic ◽  
Linker Molecules

In recent years, optical and electronic properties of metal–organic frameworks (MOFs) have increasingly shifted into the focus of interest of the scientific community. Here, we discuss a strategy for conveniently tuning these properties through electrostatic design. More specifically, based on quantum-mechanical simulations, we suggest an approach for creating a gradient of the electrostatic potential within a MOF thin film, exploiting collective electrostatic effects. With a suitable orientation of polar apical linkers, the resulting non-centrosymmetric packing results in an energy staircase of the frontier electronic states reminiscent of the situation in a pin-photodiode. The observed one dimensional gradient of the electrostatic potential causes a closure of the global energy gap and also shifts core-level energies by an amount equaling the size of the original band gap. The realization of such assemblies could be based on so-called pillared layer MOFs fabricated in an oriented fashion on a solid substrate employing layer by layer growth techniques. In this context, the simulations provide guidelines regarding the design of the polar apical linker molecules that would allow the realization of MOF thin films with the (vast majority of the) molecular dipole moments pointing in the same direction.

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