scholarly journals Electrochemistry and Rapid Electrochromism Control of MoO3/V2O5 Hybrid Nanobilayers

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2475 ◽  
Author(s):  
Chung-Chieh Chang ◽  
Po-Wei Chi ◽  
Prem Chandan ◽  
Chung-Kwei Lin
Keyword(s):  
Spin Coating ◽  
Monoclinic Phase ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Electrochromic Devices ◽  
X Ray ◽  
Visible Transmittance ◽  
Good Crystallinity ◽  
Electrochromic Cell ◽  
Scanning Electron

MoO3/V2O5 hybrid nanobilayers are successfully prepared by the sol–gel method with a spin- coating technique followed by heat -treatment at 350 °C in order to achieve a good crystallinity. The composition, morphology, and microstructure of the nanobilayers are characterized by a scanning electron microscope (SEM) and X-ray diffractometer (XRD) that revealed the a grain size of around 20–30 nm, and belonging to the monoclinic phase. The samples show good reversibility in the cyclic voltammetry studies and exhibit an excellent response to the visible transmittance. The electrochromic (EC) window displayed an optical transmittance changes (ΔT) of 22.65% and 31.4% at 550 and 700 nm, respectively, with the rapid response time of about 8.2 s for coloration and 6.3 s for bleaching. The advantages, such as large optical transmittance changes, rapid electrochromism control speed, and excellent cycle durability, demonstrated in the electrochromic cell proves the potential application of MoO3/V2O5 hybrid nanobilayers in electrochromic devices.

A Study on (K, Na) NbO3 Thin Films with Optimized Layer: Effect on Physical and Electrical Properties

2016 ◽  
Vol 694 ◽  
pp. 120-124 ◽  
Author(s):  
Nurul Azuwa Azmi ◽  
Umar Al Amani Azlan ◽  
Maziati Akmal Mohd Hatta ◽  
Mohd Asyadi' Azam Mohd Abid ◽  
Mohd Warikh Ab Rashid
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Sol Gel ◽  
Inhomogeneous Distribution ◽  
X Ray ◽  
Number Of Layers ◽  
Layer Deposition ◽  
Layer Effect ◽  
Gel Technique ◽  
Scanning Electron

(K, Na)NbO3 (KNN) thin films were prepared by sol-gel technique. Spin coating deposition and rapid thermal annealing (RTP) process were applied to produce the KNN thin films. The films obtained demonstrated that highly crystallographic orientation was produced at five layer deposition with increase (preferred orientation) peak at (1 1 1). The thickness of five layers thin films observed by field emission scanning electron microscopy (FE-SEM) was determined to be ~200nm. However, the inhomogeneous distribution of KNN particles was detected in KNN thin films. The distribution of KNN elements was confirmed by energy-dispersive X-ray (EDX) spectra. Improvement was observed in resistivity (2.71-7.81x106 Ω.cm) and dielectric loss (0.35%-0.21%) following the increasing number of layers.

Influence of Spinning Speed on the Properties of Sol-Gel Spin Coated ZnO Films

2014 ◽  
Vol 970 ◽  
pp. 115-119 ◽  
Author(s):  
Zi Neng Ng ◽  
Kah Yoong Chan ◽  
Sharul Ashikin Kamaruddin ◽  
Sahdan Mohd Zainizan
Keyword(s):  
Spin Coating ◽  
Sol Gel ◽  
Optical Transmittance ◽  
Thickness Measurement ◽  
Zno Films ◽  
Surface Scanning ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Spinning Speed

In this work, ZnO films were fabricated by sol-gel spin coating technique. Different spinning speeds of 1000 to 6000 revolutions per minute (RPM) were used in order to study the changes on the properties of the ZnO films. The characterizations were conducted using surface profilometer for thickness measurement, atomic force microscopy (AFM) for surface scanning, X-ray diffractometer (XRD) for structural analysis, and ultraviolet-visible (UV-VIS) spectrophotometer for optical transmittance. The influence of spinning speed and the mechanisms which affect the growth of the ZnO films will be revealed.

Enhanced Electrochromic Performance of Sol-Gel Derived WO3 Thin Films Assisted by Electrospun PVA Nanofibers

2012 ◽  
Vol 528 ◽  
pp. 249-253
Author(s):  
K. Paipitak ◽  
J. Rattanarak ◽  
D. Pakdeeyingyong ◽  
W. Techitdheera ◽  
S. Porntheeraphat ◽  
...  
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Emission Spectroscopy ◽  
Tungsten Powder ◽  
Sol Gel ◽  
Xrd Analysis ◽  
X Ray ◽  
Electrochromic Properties ◽  
Wo3 Thin Films ◽  
Scanning Electron

The paper describes the results obtained on the enhanced electrochromic performance of Tungsten oxide (WO3) thin films assisted by electrospun PVA nanofibers. WO3 was fabricated by spin coating technique with tungsten powder as starting precursor. The effect of electrospun-PVA nanofibers layer on structural, chemical composition, surface morphology and electrochromic properties of the films were characterized by X-ray diffractometer (XRD), X-ray photo-emission spectroscopy (XPS), scanning electron microscope (SEM) and UV-VIS spectrophotometer. The XRD analysis suggested that the crystalline of WO3 can be identified as a monoclinic WO3 structure. XPS investigations also confirmed the existence of characteristic peaks of W. The significant enhancement of electrochromic properties of the films is achieved by additive electrospun-PVA nanofiber layer.

Analysis and Structural Investigations of CdS/Quartz Nanostructures

2014 ◽  
Vol 925 ◽  
pp. 374-378 ◽  
Author(s):  
Y. Al-Douri ◽  
U. Hashim
Keyword(s):  
Spin Coating ◽  
Sol Gel ◽  
Theoretical Data ◽  
X Ray Diffraction ◽  
Structural Investigations ◽  
X Ray ◽  
Cds Nanostructures ◽  
Quartz Substrates ◽  
Scanning Electron ◽  
Good Agreement

CdS nanostructures deposited on quartz substrates with spin coating speeds 1000, 3000 and 5000 rpm and annealed at 800 °C are prepared by sol-gel spin coating technique. Ratio of cadmium to thiourea molar is 0.1:0.05 as an indication of nanostructured CdS formation with a grain size of 3.83 nm CdS nanostructures have been characterized by scanning electron microscopy (SEM) to research the morphology, respectively. Also, they have been analyzed using X-ray diffraction (XRD); the grin size, full width half maxima, miller indices, lattice constant a and c. The measured and calculated results showed a good agreement with other experimental and theoretical data.

Suppressing the Powdering of Zirconia Fibers after High-Temperature Application by Large Additions of Yttria

2011 ◽  
Vol 306-307 ◽  
pp. 1512-1515
Author(s):  
Xian Qin Hou
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Volume Expansion ◽  
Monoclinic Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
High Temperature Application ◽  
X Ray ◽  
Temperature Application ◽  
Scanning Electron

Zirconia fibers with different Y2O3 additions were prepared by sol-gel method. After the fiber was thermally treated at 1650°C for 6h, the microstructure and crystalline phase were investigated by scanning electron microscope and X-ray diffraction. It was found that the fibers with 5mol% of Y2O3 seriously powdered due to volume expansion caused by the phase transformation form tetragonal phase to monoclinic phase. The powdering of zirconia fibers after high–temperature application could be depressed when the amount of Y2O3 was more than 10mol%.

PENGGUNAAN TiO2 PARTIKEL NANO HASIL SINTESIS BERBASIS AIR MENGGUNAKAN METODA SOL-GEL PADA BAHAN KAPAS SEBAGAI APLIKASI UNTUK TEKSTIL ANTI UV

Arena Tekstil ◽  
2013 ◽  
Vol 28 (1) ◽  
Author(s):  
Maya Komalasari ◽  
Bambang Sunendar
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Sol Gel ◽  
Crosslinking Agent ◽  
X Ray Diffraction ◽  
Nano Tio2 ◽  
X Ray ◽  
Infra Red ◽  
Scanning Electron

Partikel nano TiO2 berbasis air dengan pH basa telah berhasil disintesis dengan menggunakan metode sol-gel dan diimobilisasi pada kain kapas dengan menggunakan kitosan sebagai zat pengikat silang. Sintesis dilakukan  dengan prekursor TiCl4 pada konsentrasi 0,3 M, 0,5 M dan 1 M, dan menggunakan templat kanji dengan proses kalsinasi pada suhu 500˚C selama 2 jam. Partikel nano TiO2 diaplikasikan ke kain kapas dengan metoda pad-dry-cure dan menggunakan kitosan sebagai crosslinking agent. Berdasarkan hasil Scanning Electron Microscope (SEM),diketahui bahwa morfologi partikel TiO2 berbentuk spherical dengan ukuran nano (kurang dari 100 nm). Karakterisasi X-Ray Diffraction (XRD) menunjukkan adanya tiga tipe struktur kristal utama, yaitu (100), (101) dan (102) dengan fasa kristal yang terbentuk adalah anatase dan rutile. Pada karakterisasi menggunakan SEM terhadap serbuk dari TiO2 yang telah diaplikasikan ke permukaan kain kapas, terlihat adanya imobilisasi partikel nano TiO2 melalui ikatan hidrogen silang dengan kitosan pada kain kapas. Hasil analisa tersebut kemudian dikonfirmasi dengan FTIR (Fourier Transform Infra Red) yang hasilnya memperlihatkan puncak serapan pada bilangan gelombang 3495 cm-1, 2546 cm-1, dan 511 cm-1,  yang masing-masing diasumsikan sebagai adanya vibrasi gugus fungsi O-H, N-H dan Ti-O-Ti. Hasil SEM menunjukkan pula bahwa kristal nano yang terbentuk diantaranya adalah fasa rutile , yang berdasarkan literatur terbukti dapatberfungsi sebagai anti UV.

scholarly journals Investigation of Spin Coating Cerium-Doped Hydroxyapatite Thin Films with Antifungal Properties

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 464
Author(s):  
Simona Liliana Iconaru ◽  
Mihai Valentin Predoi ◽  
Patrick Chapon ◽  
Sofia Gaiaschi ◽  
Krzysztof Rokosz ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Spin Coating ◽  
Laser Scanning ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
X Ray ◽  
Antifungal Properties ◽  
Scanning Electron

In this study, the cerium-doped hydroxyapatite (Ca10−xCex(PO4)6(OH)2 with xCe = 0.1, 10Ce-HAp) coatings obtained by the spin coating method were presented for the first time. The stability of the 10Ce-HAp suspension particles used in the preparation of coatings was evaluated by ultrasonic studies, transmission electron microscopy (TEM), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The surface morphology of the 10Ce-HAp coating was studied by SEM and atomic force microscopy (AFM) techniques. The obtained 10Ce-HAp coatings were uniform and without cracks or unevenness. Glow discharge optical emission spectroscopy (GDOES) and X-ray photoelectron spectroscopy (XPS) were used for the investigation of fine chemical depth profiling. The antifungal properties of the HAp and 10Ce-HAp suspensions and coatings were assessed using Candida albicans ATCC 10231 (C. albicans) fungal strain. The quantitative antifungal assays demonstrated that both 10Ce-HAp suspensions and coatings exhibited strong antifungal properties and that they successfully inhibited the development and adherence of C. albicans fungal cells for all the tested time intervals. The scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) visualization of the C. albicans fungal cells adherence to the 10Ce-HAp surface also demonstrated their strong inhibitory effects. In addition, the qualitative assays also suggested that the 10Ce-HAp coatings successfully stopped the biofilm formation.

Photoelectrochemical Properties of Anatase TiO2 Films Prepared by Improved Liquid Phase Deposition

2015 ◽  
Vol 1120-1121 ◽  
pp. 419-423
Author(s):  
Cai Xia Lei ◽  
X.L. Jiang ◽  
Y. Liu ◽  
X. Liu ◽  
Y.T. Ma ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Liquid Phase ◽  
Scanning Electron Microscope ◽  
Reaction Temperature ◽  
White Light ◽  
Photoelectrochemical Properties ◽  
Liquid Phase Deposition ◽  
X Ray ◽  
Good Crystallinity ◽  
Scanning Electron

In this paper, the hydrothermal-assisted liquid phase deposition (HT-LPD) method has been developed to prepare TiO2 films. The crystalline structures and morphologies of as-prepared TiO2 films were analyzed using an X-ray diffractometer (XRD) and scanning electron microscope (SEM). It was found that the HT-LPD TiO2 film showed good crystallinity with preferrred orientation along c-axis. Moreover, the as-prepared TiO2 films consisted of two layers, with the tiny nanoparticles as the underlying layer and the flower-like clusters as the upper layer. The photoelectrochemical measurements revealed that, when illuminated by the white light, the HT-LPD TiO2 films exhibited a more negative photopotential value and an increased photocurrent value with elevated reaction temperature, excepting for the sample prerared at 150 °C. In summary, the TiO2 films prepared by the improved LPD method could be served as the promising photoanode for the photoelectrochemical applications.

Sintering Process of Nd:YAG Transparent Ceramic

2013 ◽  
Vol 281 ◽  
pp. 475-479
Author(s):  
Bo Wang ◽  
Quan Xi Cao ◽  
Guang Xu ◽  
Sen Tian
Keyword(s):  
Grain Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Crystal Structures ◽  
Heating Rate ◽  
Optical Transmittance ◽  
Sintering Process ◽  
X Ray ◽  
Polycrystalline Ceramics ◽  
Scanning Electron

1.0at% Nd:YAG polycrystalline ceramics were sintered at 1420°C, 1500°C, 1600°C and 1730°C respectively by different heating rate (1°C/min and 5°C/min). The crystal structures were indexed by X-ray diffractometer (XRD). The microstructure and the grain size of the samples were characterized by scanning electron microscope (SEM). The optical transmittance spectra of the samples were measured using V-570 UV spectrophotometer. The sintering process of Nd:YAG ceramics and the effect of heating rate on the microstructure of samples have been investigated.

scholarly journals Structural and optical properties of SnO2–Al2O3 nanocomposite synthesized via sol-gel route

2015 ◽  
Vol 33 (4) ◽  
pp. 714-718 ◽  
Author(s):  
Neeraj K. Mishra ◽  
Chaitnaya Kumar ◽  
Amit Kumar ◽  
Manish Kumar ◽  
Pratibha Chaudhary ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Optical Properties ◽  
Sol Gel ◽  
Physical Interaction ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Sensing Applications ◽  
Scanning Electron

AbstractA nanocomposite of 0.5SnO2–0.5Al2O3 has been synthesized using a sol-gel route. Structural and optical properties of the nanocomposite have been discussed in detail. Powder X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray diffraction spectroscopy confirm the phase purity and the particle size of the 0.5SnO2–0.5Al2O3 nanocomposite (13 to 15 nm). The scanning electron microscopy also confirms the porosity in the sample, useful in sensing applications. The FT-IR analysis confirms the presence of physical interaction between SnO2 and Al2O3 due to the slight shifting and broadening of characteristic bands. The UV-Vis analysis confirms the semiconducting nature because of direct transition of electrons into the 0.5SnO2–0.5Al2O3 nanocomposites.

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