The Effect of Heat Treating on the Microstructure and Mechanical Properties of Cr-Cu-N Nanocomposite Thin Films

2009 ◽  
Vol 79-82 ◽  
pp. 573-576 ◽  
Author(s):  
Jyh Wei Lee ◽  
Zhi Fan Zeng ◽  
Chaur Jeng Wang
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Heating Temperature ◽  
Heat Treating ◽  
Softening Effect ◽  
Compact Structure ◽  
Cross Sectional ◽  
Cu Content ◽  
Nanocomposite Thin Films ◽  
Oxide Particles

The Cr-Cu-N nanocomposite thin films with copper contents ranging from 1.6 to 24.1 at.% were deposited on silicon wafer substrates using a bipolar asymmetry pulsed DC reactive magnetron sputtering system. A dense and compact structure was observed for the thin film containing higher than 10.2 at.% Cu, whereas columnar structures were revealed on the coatings with less than 10.2 at.% Cu. Heat treatments of the as-deposited thin films were held in a vacuum tube furnace at 400, 450 and 500oC for 30 minutes, respectively. It was observed that the copper atoms would diffuse to the surface to form oxide particles on the coating contained higher Cu content after heating higher than 450oC. The quantity and size of the oxide particles increased with increasing heating temperature and Cu content in the thin film. The hardness of coatings increased after heating except #D thin film containing 24.1 at.% Cu, which the softening effect was found after heating at 500oC. A granular and less dense cross-sectional morphology was observed on #D coating after heat treating at 500oC, which was responsible for the lower hardness of thin film.

scholarly journals Optimizing the Properties of La0.8Sr0.2CrO3 Thin Films through Post-Annealing for High-Temperature Sensing

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1802
Author(s):  
Dan Liu ◽  
Peng Shi ◽  
Yantao Liu ◽  
Yijun Zhang ◽  
Bian Tian ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Annealing Temperature ◽  
Rf Sputtering ◽  
Maximum Size ◽  
Cross Sectional ◽  
Post Annealing ◽  
Maximum Conductivity ◽  
Different Temperatures ◽  
Post Annealing Temperature

La0.8Sr0.2CrO3 (0.2LSCO) thin films were prepared via the RF sputtering method to fabricate thin-film thermocouples (TFTCs), and post-annealing processes were employed to optimize their properties to sense high temperatures. The XRD patterns of the 0.2LSCO thin films showed a pure phase, and their crystallinities increased with the post-annealing temperature from 800 °C to 1000 °C, while some impurity phases of Cr2O3 and SrCr2O7 were observed above 1000 °C. The surface images indicated that the grain size increased first and then decreased, and the maximum size was 0.71 μm at 1100 °C. The cross-sectional images showed that the thickness of the 0.2LSCO thin films decreased significantly above 1000 °C, which was mainly due to the evaporation of Sr2+ and Cr3+. At the same time, the maximum conductivity was achieved for the film annealed at 1000 °C, which was 6.25 × 10−2 S/cm. When the thin films post-annealed at different temperatures were coupled with Pt reference electrodes to form TFTCs, the trend of output voltage to first increase and then decrease was observed, and the maximum average Seebeck coefficient of 167.8 µV/°C was obtained for the 0.2LSCO thin film post-annealed at 1100 °C. Through post-annealing optimization, the best post-annealing temperature was 1000 °C, which made the 0.2LSCO thin film more stable to monitor the temperatures of turbine engines for a long period of time.

scholarly journals A tunable volatile organic compound sensor by using PtOx/GQDs/TiO2 nanocomposite thin films at room temperature under visible-light activation

RSC Advances ◽  
2017 ◽  
Vol 7 (63) ◽  
pp. 39859-39868 ◽  
Author(s):  
Shaofeng Shao ◽  
Yunyun Chen ◽  
Shenbei Huang ◽  
Fan Jiang ◽  
Yunfei Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Visible Light ◽  
Gas Sensors ◽  
Room Temperature ◽  
Light Activation ◽  
Nanocomposite Thin Film ◽  
Nanocomposite Thin Films ◽  
Volatile Organic ◽  
Visible Light Activation

Pt/GQDs/TiO2 nanocomposite thin film-based gas sensors show tunable VOC sensing behaviour at room temperature under visible-light activation.

Fast grown self-assembled polythiophene/graphene oxide nanocomposite thin films at air–liquid interface with high mobility used in polymer thin film transistors

2018 ◽  
Vol 6 (37) ◽  
pp. 9981-9989 ◽  
Author(s):  
Nikhil Nikhil ◽  
Rajiv K. Pandey ◽  
Praveen Kumar Sahu ◽  
Manish Kumar Singh ◽  
Rajiv Prakash
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Thin Film Transistors ◽  
High Performance ◽  
Electronic Device ◽  
High Mobility ◽  
Practical Application ◽  
Polymer Thin Film ◽  
Nanocomposite Thin Films ◽  
Air Liquid Interface

Successful practical application of a polymer or its nanocomposite depends on the ability to produce a high performance electronic device at a significantly lesser cost and time than those needed to manufacture conventional devices.

ISOTHERMS AND MORPHOLOGY OF NANOCOMPOSITE THIN FILMS DEPOSITED USING MODIFIED LANGMUIR-SCHAEFER TECHNIQUE

2016 ◽  
Vol 78 (5-10) ◽  
Author(s):  
S. Malik ◽  
Fatin Hana Naning ◽  
Azyuni Aziz
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Stearic Acid ◽  
Surface Pressure ◽  
Polymer Nanocomposite ◽  
Cdse Nanoparticles ◽  
Large Area ◽  
Nanocomposite Thin Films ◽  
Exposure Technique

Various techniques have been used to prepare polymer nanocomposite thin films that involve tedious work and consume considerable amount of materials and time. In this study, nanocomposite thin films of poly (3-hexylthiophene -2, 5-diyl) (P3HT), stearic acid and CdSe nanoparticles were fabricated by a stamping method which is a modification of Langmuir Schaefer technique. The CdSe nanoparticles were then grown in-situ between subsequent layers of thin film by gas exposure technique. Their surface-pressure (-A) isotherms and morphology were investigated. The surface-pressure isotherms revealed that, impurities in water subphase affect the profile of Langmuir monolayer. Stearic acid was found to be more dominant as compared to P3HT. The modified Langmuir Schaefer technique produced fairly smooth, large area nanocomposite thin films as shown by the AFM images. A prominent advantage of this procedure is that it requires only small amount of materials.

Study of the growth mechanism of highly in-plane aligned α-axis YBa2Cu3O7−x thin films on LaSrGaO4 substrate by high resolution electron microscopy

1996 ◽  
Vol 11 (12) ◽  
pp. 2951-2954 ◽  
Author(s):  
J. G. Wen ◽  
S. Mahajan ◽  
H. Ohtsuka ◽  
T. Morishita ◽  
N. Koshizuka
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Cross Sectional ◽  
Plan View ◽  
Oriented Film ◽  
Resolution Electron ◽  
Average Size

Highly in-plane aligned α-axis YBa2Cu3O7−x thin films deposited on (100) LaSrGaO4 substrates by a self-template method were studied by high-resolution electron microscopy along three orthogonal 〈100〉 axes of the substrate. Plan-view images confirm that the majority of the film preferentially aligns across the entire substrate except for very few misaligned domains with average size 10 nm2. Cross-sectional images along the [100] orientation of YBa2Cu3O7−x reveal that in-plane aligned α-axis YBa2Cu3O7−x is grown on a template layer dominated by c-axis oriented film. This strongly suggests that the in-plane alignment of α-axis YBa2Cu3O7−x thin films on (100) LaSrGaO4 substrates is governed by the different stresses along the b and c axes of the substrate. Cross-sectional images along [001] of the YBa2Cu3O7—x thin film reveal that the 90° domains easily nucleate in the region between α-axis YBa2Cu3O7—x and the YBa4Cu3Ox phase. Cracks along the (001) plane of YBa2Cu3O7−x are found to be due to the large mismatch between the c parameters of the thin film and substrate.

Effect of TiO2 Nanofiller on Nanocomposited PMMA/TiO2 Thin Film

2012 ◽  
Vol 576 ◽  
pp. 417-420 ◽  
Author(s):  
N.N. Hafizah ◽  
Ismail Lyly Nyl ◽  
M.Z. Musa ◽  
Mohamad Rusop Mahmood
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Spin Coating ◽  
Weight Percentage ◽  
Force Microscopy ◽  
Atomic Force ◽  
Nanocomposite Thin Films ◽  
Scanning Electron

In this study, PMMA/TiO2 nanocomposite thin films were prepared by using sonication spin coating technique. The PMMA and TiO2 solution were mixed together and sonicated for 1h to confirm the homogeneity of the sample. The thin films obtained were then measured using atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM) and Fourier transform infrared (FTIR). FESEM micrograph reveals that the uniformity increases with the increase of TiO2 weight percentage.

Thin-film synthesis and microstructure characterization of the poly(vinyl alcohol) matrix with functionalized carbon nanotubes

2007 ◽  
Vol 22 (7) ◽  
pp. 1872-1878 ◽  
Author(s):  
Xiaoling He ◽  
Song Xu ◽  
Andrey V. Sklyarov ◽  
Steven Hardcastle
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Carbon Nanotubes ◽  
Ethylene Glycol ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Poly Ethylene Glycol ◽  
Nanocomposite Thin Films ◽  
Poly Ethylene

We report on the synthesis and surface characterization of thin-film nanocomposites using functionalized single-walled carbon nanotubes (CNTs) with a diamine-terminated oligomeric poly(ethylene glycol) [poly(ethylene glycol) bis (3-aminopropyl)-terminated 1500]. The functionalized CNT samples are soluble in highly polar solvents. Their common solubility allows for the intimate mixing of the functionalized nanotubes with the matrix polymer–poly(vinyl alcohol) by dip coating and wet casting to form nanocomposite thin films. We demonstrate the alignment of the CNT bundles in the thin films that are formed without the external field forces. We present our results and discuss alignment reorientations from the characterizations of the nanocomposite thin films by using a Raman spectrometer, scanning electron microscopy, and atomic force microscopy.

Extraction of Elastic Modulus and Hardness of the Soft Metallic Films on Hard Substrates by Nanoindentation

2007 ◽  
Vol 561-565 ◽  
pp. 2005-2008
Author(s):  
X.Y. Zhou ◽  
Hai Rong Wang ◽  
Zhuang De Jiang ◽  
Rui Xia Yu
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Elastic Modulus ◽  
Contact Stiffness ◽  
Cross Sectional ◽  
Simple Method ◽  
Sem Image ◽  
Sputter Deposited ◽  
Film Substrate ◽  
Hard Substrates

A simple method to extract the intrinsic mechanical properties of the soft metallic thin films on hard substrates by nanoindenation is presented. Utilizing the geometry relationship of residual impressions obtained by the SEM image and the cross-sectional profile, the pile up error in elastic modulus determination of soft thin films by the Oliver and Pharr analysis is first corrected. Knowledge of the ‘true’ elastic modulus, the ‘true’ hardness of thin film is then extracted from the measured contact stiffness data for an elastically homogeneous film-substrate system. The present method is applied for a 504 nm Au thin film sputter deposited on the glass substrate and the results show that the ‘true’ elastic modulus and hardness of Au film are 80 GPa and 1.3 GPa, which are in agreement well with the literatures.

Surface Morphologies of PVDF-TrFE/MgO Nanocomposite Thin Films and its Effect on the Ferroelectric Properties

2015 ◽  
Vol 1134 ◽  
pp. 6-11 ◽  
Author(s):  
Mohamad Hafiz Mohd Wahid ◽  
Rozana Mohd Dahan ◽  
Siti Zaleha Sa'ad ◽  
Adillah Nurashikin Arshad ◽  
Muhamad Naiman Sarip ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Magnesium Oxide ◽  
Ferroelectric Properties ◽  
Filler Loading ◽  
Nanocomposite Thin Film ◽  
Nanocomposite Thin Films ◽  
Surface Morphologies

The enhancement of ferroelectric and dielectric properties of PVDF-TrFE by incorporating various percentages of Magnesium Oxide (1 – 7%) for spin coated nanocomposite thin film was demonstrated. Observations showed uniform distribution and low agglomeration of MgO in the PVDF-TrFE nanocomposite thin film, especially for 3% MgO. Additionally, the 3% MgO incorporated into PVDF-TrFE had generated the highest Pr (88 mC/m2) and dielectric constant (13.6) in comparison other percentage compositions. However, the addition of more than 3% MgO filler loading caused a reduction in the ferroelectric and dielectric properties of the nanocomposite thin films.

Vertically Aligned Nanocomposite Thin Films as a Cathode/Electrolyte Interface Layer for Thin-Film Solid Oxide Fuel Cells

2009 ◽  
Vol 19 (24) ◽  
pp. 3868-3873 ◽  
Author(s):  
Jongsik Yoon ◽  
Sungmee Cho ◽  
Jung-Hyun Kim ◽  
JoonHwan Lee ◽  
Zhenxing Bi ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Interface Layer ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Electrolyte Interface ◽  
Nanocomposite Thin Films ◽  
Vertically Aligned
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