Liquid-Mix Synthesis of Oxide Powders and Thin Films Using A Starch-Based Polymer

MRS Proceedings ◽

10.1557/proc-346-109 ◽

1994 ◽

Vol 346 ◽

Author(s):

Lone-Wen F. Tai ◽

Harlan U. Anderson

Keyword(s):

Thin Films ◽

Nitric Acid ◽

Spin Coating ◽

Yttrium Aluminum Garnet ◽

Nitrate Solution ◽

Soluble Starch ◽

Single Step ◽

Water Soluble ◽

Organic Precursor ◽

Oxide Powders

ABSTRACTA commercially available water-soluble starch derivative was used as the sole organic precursor in the Liquid-Mix synthesis of mixed-cation oxide powders and thin films. The acidified polymer (by nitric acid) was able to complex metal ions through the carboxylate ligands. Loosely agglomerated fine powders as well as dense thin films of complex oxides have been prepared using the same type of polymer. Oxide powders of Cr-doped lanthanum aluminate and yttrium aluminum garnet both crystallized in a single step, without forming any intermediate or second phases, when the amorphous resin intermediates were calcined at 650°C and 750°C for 2 hours, respectively. It was demonstrated that nitric acid could effectively reduce the viscosity of the polymer-nitrate solution to make it suitable for spin coating process. Dense thin films of Y(8 mol%)-doped ZrO2 were formed on Si and A12O3 substrates by spin coating the polymeric solution and heating at temperatures below 1000°C.

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Optimization of Transistor Characteristics and Charge Transport in Solution Processed ZnO Thin Films Grown from Zinc Neodecanoate

Electronic Materials Letters ◽

10.1007/s13391-019-00173-4 ◽

2019 ◽

Vol 15 (6) ◽

pp. 702-711 ◽

Cited By ~ 2

Author(s):

Nikhil Tiwale ◽

Satyaprasad P. Senanayak ◽

Juan Rubio-Lara ◽

Yury Alaverdyan ◽

Mark E. Welland

Keyword(s):

Thin Films ◽

Charge Transport ◽

Spin Coating ◽

Annealing Temperature ◽

Deep Level ◽

Low Cost ◽

Theoretical Models ◽

Depletion Region ◽

Single Step ◽

Zno Thin Films

Abstract Solution processing of metal oxide-based semiconductors is an attractive route for low-cost fabrication of thin films devices. ZnO thin films were synthesized from one-step spin coating-pyrolysis technique using zinc neodecanoate precursor. X-ray diffraction (XRD), UV–visible optical transmission spectrometry and photoluminescence spectroscopy suggested conversion to polycrystalline ZnO phase for decomposition temperatures higher than 400 °C. A 15 % precursor concentration was found to produce optimal TFT performance on annealing at 500 °C, due to generation of sufficient charge percolation pathways. The device performance was found to improve upon increasing the annealing temperature and the optimal saturation mobility of 0.1 cm2 V−1 s−1 with ION/IOFF ratio ~ 107 was achieved at 700 °C annealing temperature. The analysis of experimental results based on theoretical models to understand charge transport envisaged that the grain boundary depletion region is major source of deep level traps and their effective removal at increased annealing temperature leads to evolution of transistor performance. Graphic Abstract Single-step spin coating-pyrolysis synthesis of ZnO thin films from non-aqueous precursor zinc neodecanoate has been investigated for transistor applications.

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Synthesis of oxide powders by way of a polymeric steric entrapment precursor route

Journal of Materials Research ◽

10.1557/jmr.1999.0462 ◽

1999 ◽

Vol 14 (8) ◽

pp. 3417-3426 ◽

Cited By ~ 85

Author(s):

My H. Nguyen ◽

Sang-Jin Lee ◽

Waltraud M. Kriven

Keyword(s):

Metal Ion ◽

Yttrium Aluminum Garnet ◽

Mixed Oxides ◽

Experimental Studies ◽

Water Soluble ◽

Infrared Spectrometry ◽

Oxide Powders ◽

Distribution Of Components ◽

Precursor Powders ◽

Metal Ion Chelation

A polymerized organic–inorganic complexion route is introduced for the synthesis of yttrium aluminum garnet, YAG (Y3Al5O12) and cordierite (Mg2Al4Si5O18) powders. Long-chain polymers such as polyvinyl alcohol (–[CH2–CHOH]-n or PVA) or polyethylene glycol (H[O–CH2–CH2]nOH or PEG) were used as the organic carriers for a precursor ceramic gel. Calcined powders were very porous and homogeneous in distribution of components. Experimental studies by differential thermal analysis and thermogravimetric analysis, x-ray diffraction, solid-state nuclear magnetic resonance, and Fourier transform infrared spectrometry indicated that metal-ion chelation is not the primary mechanism for obtaining molecularly homogeneous precursor powders. Water-soluble cations of mixed oxides in the PVA or PEG process were sterically entrapped in the entangled network and resulted in fine and pure, mixed oxide powders.

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Optical Limiting in Chromophore-Doped Gelatin Thin Films

MRS Proceedings ◽

10.1557/proc-374-99 ◽

1994 ◽

Vol 374 ◽

Author(s):

Thomas M. Cooper ◽

Angela L. Campbell ◽

Weijie Su ◽

Keith Obermeier ◽

Karthik Natarajan ◽

...

Keyword(s):

Thin Films ◽

Aqueous Solution ◽

Optical Absorption ◽

Spin Coating ◽

Copper Phthalocyanine ◽

Optical Power ◽

Water Soluble ◽

Optical Absorption Spectroscopy ◽

Spectroscopy Optical ◽

Optical Power Limiting

AbstractTo develop optical power limiting thin films prepared from water-soluble materials, we have prepared chromophore-doped gelatin thin films. Thin films of gelatin were prepared by spin coating followed by annealing. We also prepared thin films doped with the water-soluble chromophore copper phthalocyanine sodium tetrasulfonate. The films were characterized by film profilometry and optical absorption spectroscopy. Optical power limiting measurements of these films, as well as comparisons with aqueous solution and gels were performed.

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Molarity Effect on the Structural Properties of Nano-MgO Thin Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.403-408.1168 ◽

2011 ◽

Vol 403-408 ◽

pp. 1168-1172 ◽

Cited By ~ 2

Author(s):

Zulkefle Habibah ◽

Ismail Lyly Nyl ◽

Raudah Abu Bakar ◽

Mohamad Rusop Mahmood

Keyword(s):

Thin Films ◽

Particle Size ◽

Nitric Acid ◽

Porous Structure ◽

Structural Properties ◽

Spin Coating ◽

Glass Substrate ◽

Sol Gel ◽

Molar Concentration ◽

Acetate Tetrahydrate

Nano-MgO thin films were grown on the cleaned glass substrate via sol-gel spin coating techniques using magnesium acetate tetrahydrate, ethanol and nitric acid. For the thin films deposition, the solutions were prepared at six different molar concentrations (0.1M, 0.2M, 0.4M, 0.6M, 0.8M and 1M). The thickness and roughness of nano-MgO films was found to be increased with an increase of molar concentration. The increment in particle size and agglomerated particles were observed from FESEM (JEOL JSM-J600F) images as the molar concentration increased from 0.1M to 1.0M. The results showed 0.4M nano-MgO films have the best properties for example it has a uniform film, non-porous structure and has nanometer dimension size which around 42.8nm.

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STRUCTURAL, OPTICAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF NANOCRYSTALLINE TiO2 THIN FILMS DEPOSITED BY SOL-GEL SPIN COATING

i-manager s Journal on Material Science ◽

10.26634/jms.7.1.15719 ◽

2019 ◽

Vol 7 (1) ◽

pp. 28

Author(s):

KOMARAIAH DURGAM ◽

RADHA EPPA ◽

REDDY M. V. RAMANA ◽

KUMAR J. SIVA ◽

R. SAYANNA ◽

...

Keyword(s):

Thin Films ◽

Optical Properties ◽

Photocatalytic Activity ◽

Spin Coating ◽

Sol Gel ◽

Tio2 Thin Films ◽

Nanocrystalline Tio2

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Sol-gel growth of Ni doped CdS on glass substrates: effect of spin coating speed and dopant concentration

Nanoscience &Nanotechnology-Asia ◽

10.2174/2210681210999200423120817 ◽

2020 ◽

Vol 10 ◽

Author(s):

Atefeh Nazari Setayesh ◽

Hassan Sedghi

Keyword(s):

Thin Films ◽

Optical Properties ◽

Spin Coating ◽

Optical Band Gap ◽

Dopant Concentration ◽

Rotation Speed ◽

Sol Gel ◽

Band Gap Energy ◽

Gap Energy ◽

Glass Substrates

Background: In this work, CdS thin films were synthesized by sol-gel method (spin coating technique) on glass substrates to investigate the optical behavior of the film. Methods: Different substrate spin coating speeds of 2400, 3000, 3600 rpm and different Ni dopant concentrations of 0 wt.%, 2.5 wt.%, 5 wt.%) were investigated. The optical properties of thin films such as refraction index, extinction coefficient, dielectric constant and optical band gap energy of the layers were discussed using spectroscopic ellipsometry method in the wavelength range of 300 to 900 nm. Results: It can be deduced that substrate rotation speed and dopant concentration has influenced the optical properties of thin films. By decreasing rotation speed of the substrate which results in films with more thicknesses, more optical interferences were appeared in the results. Conclusion: The samples doped with Ni comparing to pure ones have had more optical band gap energy.

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An advancement in the synthesis of unique soft magnetic CoCuFeNiZn high entropy alloy thin films

Scientific Reports ◽

10.1038/s41598-021-87786-8 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Chokkakula L. P. Pavithra ◽

Reddy Kunda Siri Kiran Janardhana ◽

Kolan Madhav Reddy ◽

Chandrasekhar Murapaka ◽

Joydip Joardar ◽

...

Keyword(s):

Thin Films ◽

Saturation Magnetization ◽

Functional Materials ◽

Single Step ◽

High Entropy Alloy ◽

High Saturation Magnetization ◽

Soft Magnetic ◽

High Entropy ◽

High Saturation ◽

Electrochemical Approach

AbstractDiscovery of advanced soft-magnetic high entropy alloy (HEA) thin films are highly pursued to obtain unidentified functional materials. The figure of merit in current nanocrystalline HEA thin films relies in integration of a simple single-step electrochemical approach with a complex HEA system containing multiple elements with dissimilar crystal structures and large variation of melting points. A new family of Cobalt–Copper–Iron–Nickel–Zinc (Co–Cu–Fe–Ni–Zn) HEA thin films are prepared through pulse electrodeposition in aqueous medium, hosts nanocrystalline features in the range of ~ 5–20 nm having FCC and BCC dual phases. The fabricated Co–Cu–Fe–Ni–Zn HEA thin films exhibited high saturation magnetization value of ~ 82 emu/g, relatively low coercivity value of 19.5 Oe and remanent magnetization of 1.17%. Irrespective of the alloying of diamagnetic Zn and Cu with ferromagnetic Fe, Co, Ni elements, the HEA thin film has resulted in relatively high saturation magnetization which can provide useful insights for its potential unexplored applications.

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