scholarly journals Lead ethyl dithiocarbamates: efficient single-source precursors to PbS nanocubes

2019 ◽  
Vol 6 (10) ◽  
pp. 190943 ◽  
Author(s):  
S. A. Saah ◽  
N. O. Boadi ◽  
D. Adu-Poku ◽  
C. Wilkins
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Band Gaps ◽  
Single Source ◽  
Single Source Precursors ◽  
X Ray ◽  
Annealing Temperatures ◽  
Optical Band Gaps ◽  
Microscopy Images ◽  
Scanning Electron

Lead ethyl dithiocarbamates have been successfully used as single-source precursors for the deposition of PbS using spin coating followed by annealing at moderate temperatures. The thin films were characterized using a powder X-ray diffractometer and were found to be face-centred cubic with the (200) plane being the most preferred orientation. Scanning electron microscopy images showed the formation of well-defined cubes. Optical band gaps of PbS thin films were estimated using Tauc plots as 0.72, 0.73 and 0.77 eV at annealing temperatures of 250, 300 and 400°C. These band gaps were all blue shifted from the bulk value of 0.41 eV. Energy-dispersive X-ray analysis was used to determine the composition of the thin films which showed an approximately 1 : 1 Pb to S ratio.

DEPOSITION OF PbS THIN FILMS FROM LEAD HEXADECYL AND OCTADECYL XANTHATE COMPLEXES USING THE SPIN COATING METHOD

MRS Advances ◽  
2019 ◽  
Vol 4 (11-12) ◽  
pp. 733-742 ◽  
Author(s):  
Selina Ama Saah ◽  
Nathaniel Owusu Boadi ◽  
Christopher Wilkins
Keyword(s):  
Thin Films ◽  
Spin Coating ◽  
Preferred Orientation ◽  
Band Gaps ◽  
Lead Sulphide ◽  
X Ray ◽  
Spin Coating Method ◽  
Glass Substrates ◽  
Optical Band Gaps ◽  
Coating Method

AbstractLead sulphide thin films have been successfully deposited by spin coating lead hexadecyl and octadecyl xanthate onto glass substrates and annealed at moderate temperatures. The thin films were characterized using powder x-ray diffractometer (p-XRD) and were found to be face centred cubic (FCC) with the (200) being the most preferred orientation. The optical band gaps obtained were 0.93 and 1.00 eV respectively for PbS from complexes (1) and (2) annealed at 350 °C. They were all blue shifted from the bulk value of 0.41 eV.

Preparation and characterization of laser-ablated multicomponent chalcogenide thin films

1990 ◽  
Vol 5 (3) ◽  
pp. 511-514 ◽  
Author(s):  
Didarul Islam ◽  
C. E. Brient ◽  
R. L. Cappelletti
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Thermal Evaporation ◽  
Analytical Techniques ◽  
X Rays ◽  
Single Source ◽  
X Ray ◽  
Chalcogenide Thin Films ◽  
Scanning Electron

The preparation of multicomponent chalcogenide glassy thin films from bulk targets by laser ablation is described. The film stoichiometries are characterized by proton-induced x-ray emission (PIXE). Compared to single source thermal evaporation, laser ablation is found to preserve starting stoichiometries in the resulting thin films far more accurately. Thermally evaporated films were studied both by PIXE and by energy dispersed x rays (EDX) produced in a scanning electron microscope, and the results of these two analytical techniques compare well.

scholarly journals Synthesis of nanostructured powders and thin films of iron sulfide from molecular precursors

RSC Advances ◽  
2018 ◽  
Vol 8 (51) ◽  
pp. 29096-29103 ◽  
Author(s):  
Laila Almanqur ◽  
Inigo Vitorica-yrezabal ◽  
George Whitehead ◽  
David J. Lewis ◽  
Paul O'Brien
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Spin Coating ◽  
Iron Sulfide ◽  
Single Source ◽  
Single Source Precursors ◽  
Molecular Precursors ◽  
Nanostructured Powders

Iron(iii) xanthate single-source precursors were used to deposit iron sulfide thin films and nanostructures by spin coating and solid state deposition.

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.

In Air Synthesis of Bi2S3 and PbS Microcrystals by Thermolysis of Single-Source Precursors

2009 ◽  
Vol 79-82 ◽  
pp. 1343-1346
Author(s):  
Zhen Ni Du ◽  
Yong Cai Zhang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Inert Gases ◽  
Formation Mechanisms ◽  
Single Source ◽  
X Ray Diffraction ◽  
Single Source Precursors ◽  
X Ray ◽  
Phase Pure ◽  
Scanning Electron

Without the protection of inert gases or vacuum environment, rod-like Bi2S3 and cubic-shaped PbS microcrystals were synthesized directly via pyrolyzing corresponding metal diethyldithiocarbamates in air at 300 °C for 3 h. The products have been characterized by X-ray diffraction and scanning electron microscope, and their possible formation mechanisms were also tentatively proposed. Furthermore, control experiments with multiple-source precursors revealed that our single-source precursors played an important role in preparing phase-pure Bi2S3 and PbS.

Influence of the Source Temperature on Properties of CdTe Thin Films by Close-Spaced Sublimation

2012 ◽  
Vol 590 ◽  
pp. 40-44 ◽  
Author(s):  
Xin Jie Shen ◽  
Cheng Wu Shi ◽  
Xiao Ping Zhan ◽  
Min Yao ◽  
Yan Ru Zhang
Keyword(s):  
Thin Films ◽  
Band Gaps ◽  
Cdte Thin Film ◽  
X Ray Diffraction ◽  
X Ray ◽  
Source Temperature ◽  
Nir Absorption ◽  
Direct Band ◽  
Cdte Thin Films ◽  
Scanning Electron

In this paper，CdTe thin films were successfully grown at higher source temperatures of 650 °C and 700 °C using close-spaced sublimation(CSS) and characterized by energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis-NIR absorption spectra, respectively. The results indicated that the grain size of CdTe thin film increased from 1 μm to 5 μm with the increase of the source temperature from 650 °C to 700 °C. The direct band gaps of CdTe thin films prepared at different source temperatures of 650 °C and 700 °C were 1.44 and 1.43 eV, respectively.

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.

scholarly journals Impact on Development of ZnS Nanoparticles Thin Film Deposited by Chemical Bath Deposition and Spin Coating

2021 ◽  
Vol 4 (5) ◽  
pp. 1-4
Author(s):  
Noor Azie Azura Mohd Arif ◽  
Chin Suk Fun
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
Chemical Bath Deposition ◽  
Spin Coating ◽  
Ultraviolet Spectroscopy ◽  
Spherical Nanoparticles ◽  
Zns Nanoparticles ◽  
X Ray ◽  
Scanning Electron

Research comparing the advantages of spin coating and chemical bath deposition is going, and there are varied views on these methods. Here, we used spin coating and chemical bath deposition to prepare thin films of ZnS nanoparticles. The film was analysed by photoluminescence (PL) spectrophotometry, field emission scanning electron microscopy (FE-SEM), ultraviolet spectroscopy (UV-Vis), and energy-dispersive X-ray (EDX) spectroscopy. The UV-Vis spectra revealed that the wavelength of ZnS is between 220 nm - 320 nm while the PL spectra showed a peak centred in the blue region. Both spin coating and chemical bath deposition rendered spherical nanoparticles but of different sizes 17.9 nm and 21.2 -25.7 nm, respectively. It was concluded that each method has its potential. This work can help researchers choose a suitable method for fabricating thin films, depending on the aims and objectives of their work.

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.

Studies on Magnetron-Sputtered NiO/Si3N4 Thin Films

2018 ◽  
Vol 17 (03) ◽  
pp. 1760039
Author(s):  
K. M. Dhanisha ◽  
M. Manoj Christopher ◽  
M. Abinaya ◽  
P. Deepak Raj ◽  
M. Sridharan
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Smooth Surface ◽  
Deposition Time ◽  
Si Substrate ◽  
X Ray ◽  
Coating Time ◽  
Deposited Films ◽  
Nio Films ◽  
Scanning Electron

The present work deals with NiO/Si3N4 layers formed by depositing nickel oxide (NiO) thin films over silicon nitrate (Si3N[Formula: see text] thin films. NiO films were coated on Si3N4-coated Si substrate using magnetron sputtering method by changing duration of coating time and were analyzed using X-ray diffractometer, field emission-scanning electron microscopy, UV–Vis spectrophotometer and four-point probe method to study the influence of thickness on physical properties. Crystallinity of the deposited films increases with increase in thickness. All films exhibited spherical-like structure, and with increase in deposition time, grains are coalesced to form smooth surface morphology. The optical bandgap of NiO films was found to decrease from 3.31[Formula: see text]eV to 3.22[Formula: see text]eV with upsurge in the thickness. The film deposited for 30[Formula: see text]min exhibits temperature coefficient resistance of [Formula: see text]1.77%/[Formula: see text]C as measured at 80[Formula: see text]C.

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