scholarly journals Artificial Synapses Based on Atomic/Molecular Layer Deposited Bilayer-Structured Memristive Thin Films

2021 ◽  
Author(s):  
Chang Liu ◽  
Lin Zhu ◽  
Lai-Guo Wang ◽  
Ai-Dong Li
Keyword(s):  
Current Model ◽  
Molecular Layer ◽  
Atomic Layer ◽  
Spike Timing ◽  
Bipolar Resistive Switching ◽  
Molecular Layer Deposition ◽  
Synaptic Functions ◽  
Layer Deposition ◽  
Resistive Switching Characteristic

This chapter deals with several kinds of ultrathin bilayer-structured memristors, such as Pt/Al2O3/HfO2/TiN, Pt/HfO2/HfOx/TiN, Pt/TiO2/Ti-based maleic acid (Ti-MA)/TaN, among which the asymmetric memristive functional layers were designed and prepared by atomic layer deposition (ALD) or molecular layer deposition (MLD) technique. These bilayer memristors exhibit a typical bipolar resistive switching characteristic, in accord with the space charge limited current model. Some important biologic synaptic functions have been achieved, including nonlinear transmission characteristics, spike-timing-dependent plasticity, short−/long-term plasticity, paired-pulse facilitation, and conditioned reflex. The mechanism of bilayer memristive device has been proposed based on oxygen vacancies migration/diffusion model. Above all the ultrathin bilayer memristors fabricated by low temperature ALD/MLD are one competitive candidate for neuromorphic simulation and flexible electronic applications.

scholarly journals Photoactive Thin-Film Structures of Curcumin, TiO2 and ZnO

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3214
Author(s):  
Anish Philip ◽  
Ramin Ghiyasi ◽  
Maarit Karppinen
Keyword(s):  
Thin Film ◽  
Molecular Layer ◽  
Wavelength Region ◽  
Atomic Layer ◽  
Biologically Active ◽  
Molecular Layer Deposition ◽  
New Horizons ◽  
Layer Deposition ◽  
Layer Structures ◽  
Novel Applications

Curcumin is known as a biologically active compound and a possible antimicrobial agent. Here, we combine it with TiO2 and ZnO semiconductors, known for their photocatalytic properties, with an eye towards synergistic photo-harvesting and/or antimicrobial effects. We deposit different nanoscale multi-layer structures of curcumin, TiO2 and ZnO, by combining the solution-based spin-coating (S-C) technique and the gas-phase atomic layer deposition (ALD) and molecular layer deposition (MLD) thin-film techniques. As one of the highlights, we demonstrate for these multi-layer structures a red-shift in the absorbance maximum and an expansion of the absorbance edge as far as the longest visible wavelength region, which activates them for the visible light harvesting. The novel fabrication approaches introduced here should be compatible with, e.g., textile substrates, opening up new horizons for novel applications such as new types of protective masks with thin conformal antimicrobial coatings.

scholarly journals Molecular Layer Deposition of Crosslinked Polymeric Lithicone for Superior Lithium Metal Anodes

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xiangbo Meng ◽  
Kah Chun Lau ◽  
Hua Zhou ◽  
Sujan Kumar Ghosh ◽  
Mourad Benamara ◽  
...  
Keyword(s):  
Molecular Layer ◽  
Solid Electrolyte Interphase ◽  
Lithium Metal ◽  
Molecular Layer Deposition ◽  
Lithium Metal Batteries ◽  
Layer Deposition ◽  
Lithium Metal Anodes ◽  
First Time ◽  
Metal Anodes

In this work, we for the first time developed a novel lithium-containing crosslinked polymeric material, a lithicone that enables excellent protection effects over lithium (Li) metal anodes. This new lithicone was synthesized via an accurately controllable molecular layer deposition (MLD) process, in which lithium tert-butoxide (LTB) and glycerol (GL) were used as precursors. The resultant LiGL lithicone was analyzed using a suite of characterizations. Furthermore, we found that the LiGL thichicone could serve as an exceptional polymeric protection film over Li metal anodes. Our experimental data revealed that the Li electrodes coated by this LiGL lithicone can achieve a superior cycling stability, accounting for an extremely long cyclability of >13,600 Li-stripping/plating cycles and having no failures so far in Li/Li symmetric cells at a current density of 5 mA/cm2 and an areal capacity of 1 mAh/cm2. We found that, with a sufficient protection by this LiGL coating, Li electrodes could realize long-term stable cyclability with little formation of Li dendrites and solid electrolyte interphase. This novel LiGL represents a facile and effective solution to the existing issues of Li anodes and potentially paves a technically feasible route for lithium metal batteries.

scholarly journals Biocompatible organic–inorganic hybrid materials based on nucleobases and titanium developed by molecular layer deposition

2019 ◽  
Vol 10 ◽  
pp. 399-411 ◽  
Author(s):  
Leva Momtazi ◽  
Henrik H Sønsteby ◽  
Ola Nilsen
Keyword(s):  
Photoelectron Spectroscopy ◽  
Molecular Layer ◽  
Atomic Layer ◽  
Amorphous Structure ◽  
Index Of Refraction ◽  
Molecular Layer Deposition ◽  
Inorganic Hybrid ◽  
X Ray ◽  
Layer Deposition ◽  
Hybrid Character

We have constructed thin films of organic–inorganic hybrid character by combining titanium tetra-isopropoxide (TTIP) and the nucleobases thymine, uracil or adenine using the molecular layer deposition (MLD) approach. Such materials have potential as bioactive coatings, and the bioactivity of these films is described in our recent work [Momtazi, L.; Dartt, D. A.; Nilsen, O.; Eidet, J. R. J. Biomed. Mater. Res., Part A 2018, 106, 3090–3098. doi:10.1002/jbm.a.36499]. The growth was followed by in situ quartz crystal microbalance (QCM) measurements and all systems exhibited atomic layer deposition (ALD) type of growth. The adenine system has an ALD temperature window between 250 and 300 °C, while an overall reduction in growth rate with increasing temperature was observed for the uracil and thymine systems. The bonding modes of the films have been further characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction, confirming the hybrid nature of the as-deposited films with an amorphous structure where partial inclusion of the TTIP molecule occurs during growth. The films are highly hydrophilic, while the nucleobases do leach in water providing an amorphous structure mainly of TiO2 with reduced density and index of refraction.

scholarly journals Organic and inorganic–organic thin film structures by molecular layer deposition: A review

2014 ◽  
Vol 5 ◽  
pp. 1104-1136 ◽  
Author(s):  
Pia Sundberg ◽  
Maarit Karppinen
Keyword(s):  
Thin Films ◽  
Hybrid Materials ◽  
Molecular Layer ◽  
Three Dimensional ◽  
Atomic Layer ◽  
Great Promise ◽  
Organic Thin Film ◽  
Molecular Layer Deposition ◽  
Composition Control ◽  
Layer Deposition

The possibility to deposit purely organic and hybrid inorganic–organic materials in a way parallel to the state-of-the-art gas-phase deposition method of inorganic thin films, i.e., atomic layer deposition (ALD), is currently experiencing a strongly growing interest. Like ALD in case of the inorganics, the emerging molecular layer deposition (MLD) technique for organic constituents can be employed to fabricate high-quality thin films and coatings with thickness and composition control on the molecular scale, even on complex three-dimensional structures. Moreover, by combining the two techniques, ALD and MLD, fundamentally new types of inorganic–organic hybrid materials can be produced. In this review article, we first describe the basic concepts regarding the MLD and ALD/MLD processes, followed by a comprehensive review of the various precursors and precursor pairs so far employed in these processes. Finally, we discuss the first proof-of-concept experiments in which the newly developed MLD and ALD/MLD processes are exploited to fabricate novel multilayer and nanostructure architectures by combining different inorganic, organic and hybrid material layers into on-demand designed mixtures, superlattices and nanolaminates, and employing new innovative nanotemplates or post-deposition treatments to, e.g., selectively decompose parts of the structure. Such layer-engineered and/or nanostructured hybrid materials with exciting combinations of functional properties hold great promise for high-end technological applications.

scholarly journals Low-temperature atomic layer deposition of Al2O3/alucone nanolaminates for OLED encapsulation

RSC Advances ◽  
2019 ◽  
Vol 9 (36) ◽  
pp. 20884-20891 ◽  
Author(s):  
Guixiong Chen ◽  
Yalian Weng ◽  
Fan Sun ◽  
Xiongtu Zhou ◽  
Chaoxing Wu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Atomic Layer Deposition ◽  
Molecular Layer ◽  
Atomic Layer ◽  
Barrier Properties ◽  
Organic Light Emitting Diodes ◽  
Molecular Layer Deposition ◽  
Light Emitting ◽  
Organic Light ◽  
Layer Deposition

Al2O3/alucone laminates were fabricated by atomic layer deposition (ALD) and molecular layer deposition (MLD), showing good barrier properties. These laminates were found to prolong the lifetime of organic light-emitting diodes (OLEDs) evidently.

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