Influence of the thin-film thickness and crystallization temperature on the spherulitic structure of polymer thin films

2010 ◽  
Vol 115 (3) ◽  
pp. 1616-1621 ◽  
Author(s):  
Jieping Liu ◽  
Xiaoping Qiao ◽  
Shuangai He ◽  
Qikun Cao ◽  
Hui Wang
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Film Thickness ◽  
Crystallization Temperature ◽  
Polymer Thin Films ◽  
Thin Film Thickness ◽  
Spherulitic Structure

scholarly journals Current Opportunities and Challenges in Biopolymer Thin Film Analysis—Determination of Film Thickness

2021 ◽  
Vol 3 ◽  
Author(s):  
Stefan Spirk ◽  
Chonnipa Palasingh ◽  
Tiina Nypelö
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Film Thickness ◽  
Polymer Thin Films ◽  
Cellulose Nanofibrils ◽  
Thin Film Thickness ◽  
Thin Film Analysis ◽  
Biopolymer Film ◽  
Analysis Determination

Polymer thin films with thickness below 100 nm are a fascinating class of 2D materials with commercial and research applications in many branches ranging from coatings to photoresists and insulating materials, to mention just a few uses. Biopolymers have extended the scope of polymer thin films with unique materials such as cellulose, cellulose nanocrystals, cellulose nanofibrils with tunable water uptake, crystallinity and optical properties. The key information needed in thin biopolymer film use and research is film thickness. It is often challenging to determine precisely and hence several techniques and their combinations are used. Additional challenges with hydrophilic biopolymers such as cellulose are the presence of humidity and the soft and often heterogenous structure of the films. This minireview summarizes currently used methods and techniques for biopolymer thin film thickness analysis and outlines challenges for accurate and reproducible characterization. Cellulose is chosen as the representative biopolymer.

scholarly journals Precise control of Jeff=12 magnetic properties in Sr2IrO4 epitaxial thin films by variation of strain and thin film thickness

2020 ◽  
Vol 102 (21) ◽  
Author(s):  
Stephan Geprägs ◽  
Björn Erik Skovdal ◽  
Monika Scheufele ◽  
Matthias Opel ◽  
Didier Wermeille ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetic Properties ◽  
Film Thickness ◽  
Epitaxial Thin Films ◽  
Thin Film Thickness ◽  
Precise Control

The effect of thin film thickness on thermal nonlinear optical properties and surface morphology of Cu nanostructure thin films

Optik ◽  
2019 ◽  
Vol 199 ◽  
pp. 163517 ◽  
Author(s):  
Mahsa Etminan ◽  
Nooshin. S. Hosseini ◽  
Narges Ajamgard ◽  
Ataalah Koohian ◽  
Mehdi Ranjbar
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Surface Morphology ◽  
Film Thickness ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Thin Film Thickness

scholarly journals An Analysis of Non-Destructive Methods for Thin Film Thickness Measurement

2019 ◽  
pp. 18-27 ◽  
Author(s):  
A.E. Shupenev ◽  
N.S. Pankova ◽  
I.S. Korshunov ◽  
A.G. Grigoriyants
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Film Thickness ◽  
High Energy ◽  
Thickness Measurement ◽  
Film Deposition ◽  
Thin Film Thickness ◽  
Optimal Method ◽  
Non Destructive ◽  
Destructive Methods

The thickness of thin films determines the films’ unique properties, due to which they are widely used in optics and electronics. To measure the thickness of films in the range of 1 nm — 1 mcm during film deposition or on a finished product, it is important that non-destructive measurement methods should be used. An analysis of the most commonly used non-destructive methods for measuring and controlling the thickness of thin films is performed, with a possibility of in situ control of the technological process as well as for testing of finished products. This work describes theoretical and practical considerations of using reflection high-energy electron diffraction, piezoelectricity, interferometry and gravimetric methods for thin film thickness measurements. The results of the study can be used for selecting an optimal method of obtaining thin films when conducting theoretical and applied research.

Effects of Annealing Treatment on WO3 Thin Films Prepared by DC Reactive Magnetron Sputtering

2014 ◽  
Vol 979 ◽  
pp. 248-250 ◽  
Author(s):  
Thanat Srichaiyaperk ◽  
Kamon Aiempanakit ◽  
Mati Horprathum ◽  
Pitak Eiamchai ◽  
Chanunthorn Chananonnawathorn ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
Film Thickness ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Reactive Magnetron ◽  
Thin Film Thickness ◽  
Dc Reactive Magnetron Sputtering

Tungsten trioxide (WO3) thin films were prepared by a DC reactive magnetron sputtering technique. The thin film fabrication process used tungsten (99.995%) as the sputtering target, the mixture of argon and oxygen as sputtering and reactive gases, and silicon (100) and glass slides as the substrates. The effects of annealing temperature in the range of 200-400°C on physical and optical properties of the WO3 thin films were investigated. The nanostructures and morphologies of these films were characterized by grazing-incident X-ray diffraction (GIXRD) and field-emission scanning electron microscopy (FE-SEM). The optical properties were analyzed by variable-angle spectroscopic ellipsometry (VASE) and spectrophotometer. From the XRD results, the as-deposited and annealed WO3 thin films up to 300°C were all amorphous. Only the WO3 thin film annealed at 400°C exhibited a polycrystalline monoclinic phase. The FE-SEM cross-sections and surface topologies demonstrated nearly identical thin-film thickness and physical grain sizes. The SE analyses showed that the thin films were all homogeneous dense layers with additional surface roughness. With the annealing treatment, the thin film thickness was slightly decreased. The SE physical model was best optimized with the Cauchy optical model. The results showed that the refractive index at 550 nm was increased from 2.17 to 2.23 with the increased annealing temperature. The results from the spectrophotometer confirmed that the optical spectra for the WO3 thin films were decreased. This study demonstrated that, the thin film annealed at 400°C exhibited the slightly lower transparency, which corresponded to the results from the GIXRD and SE analyses.

Determination of Thickness and Optical Properties of Tantalum Oxide Thin Films by Spectroscopic Ellipsometry

2014 ◽  
Vol 979 ◽  
pp. 244-247 ◽  
Author(s):  
Chanunthorn Chananonnawathorn ◽  
Narathon Khemasiri ◽  
Thanat Srichaiyaperk ◽  
Benjarong Samransuksamer ◽  
Mati Horprathum ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Film Thickness ◽  
Physical Model ◽  
Spectroscopic Ellipsometry ◽  
Dispersion Model ◽  
Tantalum Oxide ◽  
Physical Models ◽  
Thin Film Thickness

Tantalum oxide (Ta2O5) thin films were prepared, at different deposition time, by a DC reactive magnetron sputtering. During the deposition, a high-quality tantalum target was sputtered under argon and oxygen ambience on to silicon (100) and glass substrates. The prepared thin films were systematically characterized for both physical and optical properties based on spectroscopic ellipsometry (SE), and consequently confirmed by several methods. With the SE physical models, we could determine the thin film thickness as well as their inhomogeneity. The films thickness results were directly confirmed by field-emission scanning electron microscopy (FE-SEM) used to observe cross-sections, and surface profiler used to measure the physical thickness of the films. With the SE optical models, we applied both the Cauchy and Tauc-Lorentz dispersions in order to obtain the optical constants, to be directly compared with those from the Swanepoel method (SM). Our result showed that from the SE analyses, the SE physical model was obtained as the multi-layer configurations. The obtained Ta2O5 thin film thickness was closely related with the measured result from the FE-SEM cross-sectional micrographs and the surface profiler. For the optical characteristic, the double layer physical model was best optimized with the Tauc Lorentz dispersion model for the most accurate results. In comparison, the SM technique also demonstrated a capability to determine both the film thickness and its refractive index only from some samples. Therefore, this study proved that the SE technique successfully and accurately determine both the physical and optical properties of the Ta2O5 thin films.

scholarly journals Dynamics and Structure Formation of Confined Polymer Thin Films Supported on Solid Substrates

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1621
Author(s):  
Mujib Ur Rahman ◽  
Yonghao Xi ◽  
Haipeng Li ◽  
Fei Chen ◽  
Dongjie Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Film Thickness ◽  
Effective Viscosity ◽  
Polymer Thin Films ◽  
Polymer Substrate ◽  
Native Oxide Layer ◽  
Si Substrates ◽  
Substrate Interaction ◽  
Residual Film

The stability/instability behavior of polystyrene (PS) films with tunable thickness ranging from higher as-cast to lower residual made on Si substrates with and without native oxide layer was studied in this paper. For further extraction of residual PS thin film (hresi) and to investigate the polymer–substrate interaction, Guiselin’s method was used by decomposing the polymer thin films in different solvents. The solvents for removing loosely adsorbed chains and extracting the strongly adsorbed irreversible chains were selected based on their relative desorption energy difference with polymer. The PS thin films rinsed in chloroform with higher polarity than that of toluene showed a higher decrease in the residual film thickness but exhibited earlier growth of holes and dewetting in the film. The un-annealed samples with a higher oxide film thickness showed a higher decrease in the PS residual film thickness. The effective viscosity of PS thin films spin-coated on H-Si substrates increased because of more resistance to flow dynamics due to the stronger polymer–substrate interaction as compared to that of Si-SiOx substrates. By decreasing the film thickness, the overall effective mobility of the film increased and led to the decrease in the effective viscosity, with matching results of the film morphology from atomic force microscopy (AFM). The polymer film maintained low viscosity until a certain period of time, whereupon further annealing occurred, and the formation of holes in the film grew, which ultimately dewetted the film. The residual film decrement, growth of holes in the film, and dewetting of the polymer-confined thin film showed dependence on the effective viscosity, the strength of solvent used, and various involved interactions on the surface of substrates.

Structural, Optical and Electrical Properties of Multiple Layers Nano-Structured Zinc Oxide Thin Film

2015 ◽  
Vol 1109 ◽  
pp. 401-404
Author(s):  
I. Saurdi ◽  
Mohamad Hafiz Mamat ◽  
M.F. Malik ◽  
A. Ishak ◽  
Mohamad Rusop
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Film Thickness ◽  
Visible Region ◽  
Oxide Thin Film ◽  
Zno Thin Films ◽  
Zno Thin Film ◽  
Thin Film Thickness ◽  
Glass Substrates ◽  
Average Transmittance

The nanoStructured ZnO thin films were prepared by Spin coating technique on glass substrates at various layers. The structural and optical properties were characterized by field emission scanning electron microscopy (FESEM) and UV-Vis-NIR respectively. The surface morphology reveals that the nanostructured ZnO thin films become densely packed as the thickness increased. The average particles size of ZnO thin film estimated from FESEM images at different layers of 1, 3, 5, 7, 9 were 20nm, 28nm, 36nm, 39nm and 56nm, respectively. The surface roughness of thin films was increase as the thin film thickness increases. The results show all films are transparent in the visible region (400-800 nm) with average transmittance above 85 %. Meanwhile, the optical band gap was decrease as the film thickness increases. The conductivity of ZnO thin film slightly improved as the thickness increased as measured through two probes 1-V measurement system.

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