scholarly journals Nanoimprinted and Anodized Templates for Large-Scale and Low-Cost Nanopatterning

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3430
Author(s):  
David Navas ◽  
David G. Trabada ◽  
Manuel Vázquez
Keyword(s):  
Thin Films ◽  
Broad Spectrum ◽  
Large Scale ◽  
Low Cost ◽  
Electrochemical Process ◽  
Pattern Generation ◽  
Anodic Alumina Templates ◽  
Straight Lines ◽  
Ordered Porous ◽  
Thick Layers

Nanopatterning to fabricate advanced nanostructured materials is a widely employed technology in a broad spectrum of applications going from spintronics and nanoelectronics to nanophotonics. This work reports on an easy route for nanopatterning making use of ordered porous templates with geometries ranging from straight lines to square, triangular or rhombohedral lattices, to be employed for the designed growth of sputtered materials with engineered properties. The procedure is based on large-scale nanoimprinting using patterned low-cost commercial disks, as 1-D grating stamps, followed by a single electrochemical process that allows one to obtain 1-D ordered porous anodic templates. Multiple imprinting steps at different angles enable more complex 2-D patterned templates. Subsequently, sputtering facilitates the growth of ferromagnetic antidot thin films (e.g., from 20 to 100 nm Co thick layers) with designed symmetries. This technique constitutes a non-expensive method for massive mold production and pattern generation avoiding standard lithographical techniques. In addition, it overcomes current challenges of the two-stage electrochemical porous anodic alumina templates: (i) allowing the patterning of large areas with high ordering and/or complex antidot geometries, and (ii) being less-time consuming.

Solution-phase deposition of SnS thin films via thermo-reduction of SnS2

2018 ◽  
Vol 54 (16) ◽  
pp. 1992-1995 ◽  
Author(s):  
Yixin Dong ◽  
Gangri Cai ◽  
Qi Zhang ◽  
Hui Wang ◽  
Zhe Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Solution Phase ◽  
Sns Thin Films

Here, we demonstrate a novel solution-based route for deposition of tin monosulfide (SnS) thin films, which are emerging, non-toxic absorber materials for low-cost and large-scale PV applications, via thermo-reducing Sn(iv) to Sn(ii).

scholarly journals Facile and Novel in-Plane Structured Graphene/TiO2 Nanocomposites for Memory Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
E. M. Shehata ◽  
M. M. Ibrahim ◽  
M. R. Balboul
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Charge Trapping ◽  
Average Crystallite Size ◽  
Rietveld Analysis ◽  
Scale Production ◽  
Simple Strategy ◽  
Large Scale Production ◽  
Memory Applications

Here, we report a simple strategy for the preparation of graphene/TiO2 nanocomposite by UV-assisted incorporation of TiO2 nanosol in graphene oxide (GO) dispersion. The proposed method is facile and of low cost without using any photocatalysts or reducing agents; this can open up a new possibility for green preparation of stable graphene dispersions in large-scale production. X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy (TEM) have been used to characterize carefully the as-prepared composites and to confirm the successful preparation of the nanocomposites. The average crystallite size of TiO2 nanoparticles calculated from XRD pattern using Rietveld analysis is ~35 nm. TEM measurements show the adsorption of TiO2 onto graphene (G) sheets, which prevents the restacking of graphene sheets. Current-voltage and capacitance-voltage measurements were used to investigate the electrical resistive memory properties of GO, GO/TiO2, and G/TiO2 thin films. Observed results show hysteresis behavior due to the charge trapping and detrapping process, indicating that the prepared thin films exhibit an excellent resistance switching memory characteristic for G/TiO2 device.

Growth of Perovskite Nanorods from PbS Quantum Dots

MRS Advances ◽  
2018 ◽  
Vol 3 (32) ◽  
pp. 1843-1848 ◽  
Author(s):  
José Maria C. da Silva Filho ◽  
Francisco C. Marques
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Large Scale ◽  
Low Cost ◽  
Visible Spectrum ◽  
Lead Iodide ◽  
Lead Sulphide ◽  
Flat Film ◽  
Direct Band ◽  
Large Scale Manufacture

ABSTRACTOrganolead iodide perovskites, CH3NH3PbI3, have attracted the attention of researchers around the world due to their optical and electrical properties. Their main characteristics include, direct band-gap (1.4 to 3.0 eV), large absorption coefficient in the visible spectrum, long carrier diffusion length and ambipolar charge transport. Aside that, perovskite thin films can be produced with low cost and are compatible with large-scale manufacture. Perovskite thin films have been synthesized mainly by spin-coating technique and thermal evaporation, which can be executed in one or two steps. Aiming to increase the light absorption, nanostructured perovskite thin films are also under intense study, since the nanostructures can absorb more light than a flat film. Thus, in this work, we reported the synthesis of perovskite (CH3NH3PbI3) nanorods by means of conversion of lead sulphide quantum dots (PbSQD). The perovskite nanorods were grown by exposing the PbSQD to a highly concentrated iodine atmosphere and then dipping the resulting film in methylammonium iodide (CH3NH3I) solution. The first step converts completely the PbSQD into lead iodide (PbI2) nanowires, ≈50 µm long and ≈200 nm diameter, through substitution of sulphur by iodine atoms and subsequent aggregation of the particles. The later step converts the PbI2 nanowires in perovskite nonorods (≈5 µm long and ≈400 nm diameter). The perovskite nanorods present a regular geometry along all its length. A preferential alignment of nanorods to the substrate plane was observed. The preliminary results show that we can control the size of nanorods through exposition time of PbSQD to iodine, which change the size of PbI2 nanowire as well. The conversion process was studied by x-ray diffraction, optical absorption, photoluminescence and scanning electron microscopy.

scholarly journals ZnO/CdS Bilayer used for Electrode in Photovoltaic Device

2011 ◽  
Vol 21 (4) ◽  
pp. 379
Author(s):  
Dang Tran Chien ◽  
Pham Duy Long ◽  
Pham Van Hoi
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Photovoltaic Cell ◽  
Bilayer Film ◽  
X Ray Diffraction ◽  
Strong Adhesion ◽  
Cds Thin Films ◽  
Evaporation Technique

In this article we present the fabrication and characterization of the nanoporous ZnO and/or ZnO/CdS thin films onto indium doped-tin oxide (ITO) substrates, based on the thermal evaporation technique followed by thermal treatment. The preparation method was relatively simple and low-cost for large scale uniform coating to produce clean, dense and strong adhesion to substrate thin films. The nanostructured ZnO and ZnO/CdS thin films were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM). The nanostructured ZnO/CdS bilayer film was used in a photo-electrochemical (PEC) cell as a working electrode and a Pt net as a counter electrode. The results show that the photovoltaic cell with nanostructured ZnO/CdS bilayer film electrode has significantly improved photoelectric capability in comparison with that of ZnO electrode.

Microstructural Characterization of Thin Films TiO2 Deposited Inside a Tubing by Spray Pyrolysis

2001 ◽  
Vol 7 (S2) ◽  
pp. 412-413
Author(s):  
M. Miki-Yoshida ◽  
F. Paraguay D ◽  
W. Antunez
Keyword(s):  
Thin Films ◽  
Titanium Dioxide ◽  
Spray Pyrolysis ◽  
Organic Contaminants ◽  
Large Scale ◽  
Low Cost ◽  
Microstructural Characterization ◽  
White Pigment ◽  
Titanium Dioxide Films ◽  
Coated Materials

The traditional application of titanium dioxide was as a white pigment; later, it was discovered their photocatalytic properties as an anode for the photo-oxidation of water. Furthermore, titanium dioxide films are now widely used in catalysis and photocatalysis because of low cost and other advantageous properties. For example, they have been used for decomposition of organic contaminants in air and water. Moreover, recent studies have reported bactericidal and detoxification effects of TiO2 thin films . It has been shown that TiO2- coated materials possess deodorizing, antibacterial, and self-cleaning functions under weak ultraviolet light. Titanium dioxide films can be prepared by many deposition techniques. One of them is the spray pyrolysis (SP) technique which is a low cost, simple to manipulate, and applicable to large-scale areas (final). Photocatalytic TiO2-covered tubing can be used to decompose organic contaminants and/or to sterilize microbial cells in air or water flows , using solar panel reactors or indoor panels irradiated with UV radiation.

scholarly journals Low-Cost Nanostructured Thin Films as Covert Laser Readable Security Tags for Large-Scale Productions Tracking

Applied Nano ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 319-329
Author(s):  
Laurent Gravier ◽  
Yves Salvadé ◽  
Damien Pidoux ◽  
Julien Maritz ◽  
Marco Laratta
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Scale Production ◽  
Light Emitting ◽  
Nanostructured Thin Films ◽  
Self Organized ◽  
Large Scale Production ◽  
Speckle Patterns ◽  
Promising Solution

We report here the feasibility study of anti-counterfeiting low-cost nanostructured flexible security tags for the tracking of large-scale fabrication products, such as pharmaceuticals or original equipment manufacturers. The fabrication process makes use of the mature nanotechnology called Template Synthesis to shape thin track-etched polymer film into covert laser readable tags, combining random self-organized structures with organized patterns. Techniques are developed to drastically limit the number of fabrication steps and keep fabrication costs low, while opening to numerous adjustment parameters. A dedicated, simple optical setup is presented, to capture speckle images of such tags lightened up by light emitting diodes or laser beams. Speckle images are analyzed in terms of encoding parameters, found here quite numerous to ensure a large coding range of large-scale production batches. We particularly highlight ultra-dark areas in speckle images, where nanowire structures completely inhibit speckle patterns. This unique, high-contrast optical feature addresses these low-cost nanostructured thin films to provide a very promising solution for large-scale security tags.

scholarly journals Inkjet-Printed CdTe Quantum Dots-Polyurethane Acrylate Thin Films

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Lei Du ◽  
Zhejun Liu ◽  
Suhua Jiang
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Water Content ◽  
Large Scale ◽  
Low Cost ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Flexible Displays ◽  
Uv Curable ◽  
Polyurethane Acrylate

We demonstrated the inkjet-printed CdTe quantum dots-polyurethane acrylate thin films and their potential application in the display devices. The water soluble CdTe QDs were synthesized through the wet chemistry and the emission wavelengths can be freely tuned during the preparation process. Combining with the UV curable resin polyurethane acrylate, the QDs inks were prepared and the influence of diluent and water content on the performance of resultant films was studied. The tensile stress of the films cured from the QDs inks with diluent increased from 10.6 MPa to 27.5 MPa and the low water content led to uniform polymer matrix. Furthermore, the existence of diluent and low water content would all improve the fluorescence stability of the thin films. Finally, the thin films can be deposited on different substrates and well controlled to meet the RGB color standard, which will pave the way to a simple, low-cost, large-scale, and highly reliable method for the application of flexible displays.

Production of nanopowders from physical vapor deposited films on nonmetallic substrates by conjunctional freezing-assisted ultrasonic extraction method

2018 ◽  
Vol 232 (4) ◽  
pp. 135-140 ◽  
Author(s):  
Oday A Hammadi
Keyword(s):  
Thin Films ◽  
Physical Vapor Deposition ◽  
Large Scale ◽  
Silicon Oxide ◽  
Low Cost ◽  
Glass Substrates ◽  
Iron Aluminum ◽  
Nickel Cobaltite ◽  
Nickel Copper ◽  
A New Technique

A new technique to extract nanoscale powders from thin films deposited by a physical vapor deposition method on nonmetallic substrates is proposed. Powders were extracted from films of different materials, such as silicon, nickel, copper, iron, aluminum and cobalt, and compounds, such as aluminum nitride, aluminum oxide, copper oxide, iron oxide, nickel cobaltite, nickel ferrite, nickel oxide, silicon carbide, silicon nitride and silicon oxide. These thin films were deposited on glass substrates by magnetron sputtering, pulsed-laser deposition, spray pyrolysis or thermal evaporation, and the particle sizes of the extracted powders were comparable to those of film samples. This technique is fast, low cost, reliable, highly clean and appropriate for large-scale samples.

Structural and Optical Properties of ZnO Nanorods Thin Films by Solution-Growth Method

2011 ◽  
Vol 225-226 ◽  
pp. 597-600 ◽  
Author(s):  
Chu Chi Ting ◽  
Sie Ping Chang
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Zno Nanorods ◽  
Solution Growth ◽  
Growth Technique ◽  
Glass Substrates ◽  
Growth Method ◽  
Vertically Aligned ◽  
Solution Growth Technique

Highly c-axis-oriented ZnO nanorods thin films were obtained on silica glass substrates by a simple solution-growth technique. The most compact and vertically-aligned ZnO nanorods thin film with the thickness of ~800 nm and average hexagonal grain size of ~200 nm exhibits the average visible transmittance 85%, refractive index 1.74, and packing density 0.84. As we demonstrate here, the solution-growth technique was used to produce high-quality and dense ZnO nanorods thin films, and is an easily controlled, low-temperature, low-cost, and large-scale process for the fabrication of optical-grade thin films.

Nanoscale Gd-Doped CeO2 Buffer Layer for a High Performance Solid Oxide Fuel Cell

2011 ◽  
Vol 8 (4) ◽  
Author(s):  
Cornelia Endler-Schuck ◽  
André Weber ◽  
Ellen Ivers-Tiffée ◽  
Uwe Guntow ◽  
Johannes Ernst ◽  
...  
Keyword(s):  
Thin Films ◽  
Buffer Layer ◽  
High Performance ◽  
Large Scale ◽  
State Of The Art ◽  
Low Cost ◽  
Buffer Layers ◽  
Chemical Homogeneity ◽  
Ohmic Resistance ◽  
Screen Printed

Gd 2 O 3 -doped ceria (GCO) is irreplaceable as interface/buffer layer between a mixed conducting cathode such as La0.58Sr0.4Co0.2Fe0.8O3-δ (LSCF) and an 8 mol %Y2O3 stabilized ZrO2 (8YSZ) thin film electrolyte. To meet the demands of high performance, indispensable characteristics of this interface (LSCF/GCO/8YSZ) are (i) no reaction of GCO with LSCF or YSZ and (ii) a GCO layer that is defect-free (closed porosity, no cracks). It is well known that state-of-the-art screen printed and sintered GCO buffer layers are imperfect and ultimately reduce the overall performance. This study concentrates on the evaluation of nanoscaled GCO thin films integrated into anode supported cells (ASC). GCO thin films were deposited on 8YSZ electrolyte by a low temperature metal organic deposition (MOD) process. MOD is preferable because it is a versatile technique for large scale and low cost fabrication for various material compositions. The authors investigated the influence of preparation parameters with respect to chemical homogeneity and film quality (pores, cracks) of GCO thin films with a constant film thickness between 50 nm and 100 nm. Electrochemical performance of anode supported cells employing MOD derived GCO thin films will be presented in terms of ohmic resistance (ASRΩ) and will be evaluated in contrast to screen printed and sintered GCO thick films. Nanoscale MOD derived thin films with low processing temperatures and dense film qualities were vastly superior to state-of-the-art GCO and beneficial to the overall cell performance.

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