Synthesis and Characterization of Nanoparticle Films and Their Optical Properties

Thin films of () nanoparticles were synthesized using thermal evaporation method. They were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and absorption and transmission spectra. XRD results show that these films are of amorphous nature, while SEM images show nanoparticles with average particle size around 30 nm. No significant changes are observed in morphology of the deposited films by changing concentrations of Te and Ge. The optical behaviors of these films have been studied using the absorption and transmission spectra in the spectral region 400–1100 nm. The absorption, extinction coefficients and refractive index were obtained and investigated in more detail. The optical band gap () values were also determined and are found to decrease from 0.83 to 0.69 eV by increasing the concentration of Ge from 0 to 12. The transmission spectra for the thin films of nanoparticles show strong absorption at wavelength less than 500 nm and become highly transparent at wavelength above 800 nm. No significant changes in the transmission spectra are observed by increasing concentration of Ge. These results might be useful for development of optical disks and other semiconducting devices based on these nanochalcogenides.

Download Full-text

Characterization of Electrodeposited Cadmium Selenide Thin Films

Dhaka University Journal of Science ◽

10.3329/dujs.v60i1.10352 ◽

2012 ◽

Vol 60 (1) ◽

pp. 137-140 ◽

Cited By ~ 6

Author(s):

RI Chowdhury ◽

MS Islam ◽

F Sabeth ◽

G Mustafa ◽

SFU Farhad ◽

...

Keyword(s):

Thin Films ◽

Cadmium Selenide ◽

Low Cost ◽

X Ray Diffraction ◽

Glass Substrates ◽

Cdse Film ◽

Cell Structures ◽

Deposited Film ◽

Deposited Films

Cadmium selenide (CdSe) thin films have been deposited on glass/conducting glass substrates using low-cost electrodeposition method. X-ray diffraction (XRD) technique has been used to identify the phases present in the deposited films and observed that the deposited films are mainly consisting of CdSe phases. The photoelectrochemical (PEC) cell measurements indicate that the CdSe films are n-type in electrical conduction, and optical absorption measurements show that the bandgap for as-deposited film is estimated to be 2.1 eV. Upon heat treatment at 723 K for 30 min in air the band gap of CdSe film is decreased to 1.8 eV. The surface morphology of the deposited films has been characterized using scanning electron microscopy (SEM) and observed that very homogeneous and uniform CdSe film is grown onto FTO/glass substrate. The aim of this work is to use n-type CdSe window materials in CdTe based solar cell structures. The results will be presented in this paper in the light of observed data.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10352 Dhaka Univ. J. Sci. 60(1): 137-140 2012 (January)

Download Full-text

Effects of Annealing on Pulsed Laser Deposited TiO2 Thin Films

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.446-447.306 ◽

2013 ◽

Vol 446-447 ◽

pp. 306-311 ◽

Cited By ~ 1

Author(s):

Sudhanshu Dwivedi ◽

Somnath Biswas

Keyword(s):

Thin Films ◽

Pulsed Laser ◽

X Ray Diffraction ◽

Force Microscopy ◽

Si Substrates ◽

Morphological Studies ◽

Atomic Force ◽

Deposited Films ◽

Type Crystal

Mixed phase TiO2 thin films of rutile and anatase type crystal orientations were deposited on Si substrates by pulsed laser deposition (PLD) technique. When annealed at 800°C at 1 mbar oxygen pressure for 3 h, the deposited films transform into a single phase of rutile type. Structural and morphological studies of the as-deposited and annealed films were performed with X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), Raman spectroscopy, and atomic force microscopy (AFM). Photoluminescence (PL) spectroscopy was used for optical characterization of the annealed thin films.

Download Full-text

Preparation and Characterization of Gold Nanoparticles in the Presence of Citrate and Soybean Seed Extract in an Acidic Conditions

Drug Research ◽

10.1055/s-0042-113459 ◽

2017 ◽

Vol 67 (05) ◽

pp. 266-270 ◽

Cited By ~ 3

Author(s):

Ebrahim Izadi ◽

Ali Rasooli ◽

Abolfazl Akbarzadeh ◽

Soodabeh Davaran

Keyword(s):

Particle Size ◽

Gold Nanoparticles ◽

Size Distribution ◽

Average Particle Size ◽

Soybean Seed ◽

Average Particle ◽

X Ray Diffraction ◽

Soybean Extract ◽

Average Size

AbstractThrough the present study, an eco-friendly method was used to synthesize the gold nanoparticles (GNPs) by using the sodium citrate and extract of the soybean seed as reducing the agents at PH 3. X-Ray diffraction (XRD) method was used to evaluate the crystal structure of as-synthesized NPs and it’s revealed that this method leads to well crystallized GNPs. In order to determine the particle size and their distribution, field emission scanning microscopy (FE-SEM) and dynamic light scattering (DLS) were used. The results showed that, the average particle size distribution of synthesized GNPs in solutions containing of the soybean extract and 1% citrate at PH 3 is about 109.6 and 140.9 nm, respectively. Also, we find that the average size of GNPs is 40 and 33 nm from solutions of citrate and soybean extract, respectively. It was concluded that using the extract of soybean seeds as reducing agent can lead to GNPs with small size and narrow size distribution.

Download Full-text

Synthesis and Characterization of Cadmium Chalcogenide Nanomaterial (CdE; E=Se/Te) from Novel Single Source Molecular Precursor

Current Nanoscience ◽

10.2174/1573413714666171207155555 ◽

2018 ◽

Vol 14 (2) ◽

pp. 160-168 ◽

Cited By ~ 2

Author(s):

Arunendera Kumar Tiwari ◽

Tripti A. Jain ◽

Sonal Choubey ◽

Parmendra Kumar Bajpai

Keyword(s):

Average Particle Size ◽

Average Particle ◽

Single Source ◽

X Ray Diffraction ◽

Metal Chalcogenide ◽

Molecular Precursors ◽

Molecular Precursor ◽

Cadmium Chalcogenide ◽

Visible Spectra

Background: Metal chalcogenide nanomaterials represent an important group of efficient materials, in which the subtle variations in shape, size and phase of nano-powders resulted in physical properties (e.g., electronic and optical) differing from their bulk counterparts, which makes them useful materials for various technological devices. Objective: Synthesis and growth of chalcogenide nano powders from novel single source molecular precursors (i.e., Cd(II) bis-(aminopropane) selenide, Cd(II) bis-(aminoethane) telluride) for the production of cadmium chalcogenide (CdE, E= Se/Te) at nano scale. Method: Single source molecular precursor inserted in quinoline, acting as a coordinating solvent at suitable temperature, yielded vacuum dried powders of CdSe and CdTe nanomaterials. Results: The average particle size was estimated as CdSe ≈ 3 nm, and CdTe ≈ 29 nm from powder X-ray diffraction pattern of synthesized nanoparticles. The produced nanomaterials possess optical properties and calculated energy band gap of nanoparticles as CdTe = 5.2 eV and CdSe = 4.0 eV from UV-Visible spectra. Conclusion: The economical, harmless single source molecular method may be a striking technique to fabricate metal chalcogenide nanoparticles.

Download Full-text

Magnetotransport and Structural Properties of Nanocrystalline FeAgAl Thin Films

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.an17 ◽

2008 ◽

Vol 8 (8) ◽

pp. 4068-4072 ◽

Cited By ~ 1

Author(s):

P. B. Patil ◽

S. Rout ◽

A. R. B. Rao ◽

M. Senthil Kumar

Keyword(s):

Thin Films ◽

Average Particle Size ◽

Partial Substitution ◽

Average Particle ◽

X Ray Diffraction ◽

Al Content ◽

Transmission Electron ◽

Standard Value ◽

Magnetoresistance Ratio ◽

Xrd Patterns

Structural and magnetotransport properties of metallic FexAgyAlz nanogranular thin films were studied. These films with several compositions were prepared by dc magnetron sputtering. X-ray diffraction (XRD) measurements carried out on the samples show only Ag(111) peaks. The d-spacings determined from the Ag(111) peaks are smaller than the standard value for bulk Ag indicating a partial substitution of Fe and Al atoms in Ag matrix. Transmission electron diffraction (TEM) patterns show a number of Ag rings. Both XRD and TEM studies did not reveal any diffraction peaks due to Fe or Al. The average particle size determined from the TEM micrograph is 5.9 nm. This value is in good agreement with the grain size determined from the XRD patterns for the Al substituted samples. The MR was found to increase for smaller Al concentration and it decreases with further increase in Al content. In the samples investigated magnetoresistance ratio reaches a maximum value of about 4.5% for the Fe27 Ag63Al10 film.

Download Full-text

Preparation and Characterization of Core-Shell γ-Fe2O3/Au Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.299-300.722 ◽

2011 ◽

Vol 299-300 ◽

pp. 722-726

Author(s):

Wen Chang Zhuang ◽

Yu Xiao Wang

Keyword(s):

Chemical Reduction ◽

Average Particle Size ◽

Visible Spectrum ◽

Core Shell ◽

Average Particle ◽

X Ray Diffraction ◽

X Ray ◽

X Ray Scattering ◽

Uv Visible

Composites have achieved much attention because of their excellent qualities. Core-shell γ-Fe2O3/Au nanoparticles were prepared by chemical reduction. Their optical properties and morphology were characterized by UV-visible spectrum (UV-vis), X-ray diffraction (XRD) and Transmission Electronic Microscopy (TEM). Furthermore, the average particle size and interface structure were also analyzed using small angle X-ray scattering (SAXS).

Download Full-text

Preparation and Characterization of Tourmaline/ZnO Composite Thin Films by a Facile Wet-Chemical Route

Materials Science Forum ◽

10.4028/www.scientific.net/msf.809-810.649 ◽

2014 ◽

Vol 809-810 ◽

pp. 649-653 ◽

Cited By ~ 1

Author(s):

Yun Guo ◽

Qing Huang Zhang ◽

Li Rong Wang ◽

Wen Zhao Lu ◽

Lin Jun Wang

Keyword(s):

Thin Films ◽

X Ray Diffraction ◽

Sem Images ◽

Chemical Route ◽

Composite Thin Films ◽

X Ray ◽

Peak Intensity ◽

Wet Chemical ◽

Wet Chemical Route

A series of tourmaline/ZnO composite thin films were prepared by the facile route of low-temperature wet chemical method. X-ray diffraction (XRD) and Raman Spectroscopy analyses showed the hybrid spectroscopic characters of tourmaline and ZnO. With adding the different amount of tourmaline powder, ZnO tended to exhibit the different peak intensity of X-ray diffraction and Raman vibration. ZnO deposited into bending nanosheets and intersected to upstanding nanostucture on the surface of tourmaline particles in SEM images. The optical adsorption properities obtained by the UV-Vis spectra indicated that the addition of tourmaline had enhanced the maximum absorption strength, and had shifted the absorption wavelength and the absorption range of ZnO crystals.

Download Full-text

Structure and dielectric behaviour of Sr-modified Bi4Si3O12 thin films prepared via sol gel method

Processing and Application of Ceramics ◽

10.2298/pac1801036s ◽

2018 ◽

Vol 12 (1) ◽

pp. 36-44 ◽

Cited By ~ 1

Author(s):

Abbas Sadeghzadeh-Attar ◽

Saeid Hajijafari-Bidgoli ◽

Mohammad Bafandeh

Keyword(s):

Thin Films ◽

Dielectric Constant ◽

Dielectric Loss ◽

Annealing Temperature ◽

Sol Gel ◽

Average Particle Size ◽

Average Particle ◽

Sem Images ◽

Gel Method ◽

Sol Gel Method

Bismuth silicate (Bi4Si3O12, BSO) nanostructured films containing 0,1,2, and 3mol% Sr were prepared via sol-gel method and annealed at different temperatures up to 700?C. The effects of Sr content on the structure and morphology of prepared films were investigated. SEM images showed that surfaces of the prepared films were dense, smooth and homogeneous. The average particle size was changed from 30 to 35 nm as the annealing temperature was increased from 500 to 700?C. Variation of the dielectric constant and dielectric loss as a function of frequency and annealing temperature for the synthesized thin films with different content of Sr were also studied. The dielectric constant and dielectric loss decrease with Sr addition, and reach the minimum for the sample containing 2mol% Sr. These changes could be attributed to the crystal structure and formation of secondary phases.

Download Full-text

Structural and Optical Characterization of ZnO Nanoparticles Synthesized by Microemulsion Route

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.19.26 ◽

2013 ◽

Vol 19 ◽

pp. 26-36 ◽

Cited By ~ 157

Author(s):

Harish Kumar ◽

Renu Rani

Keyword(s):

Zno Nanoparticles ◽

Thermal Studies ◽

Average Particle Size ◽

Band Gap Energy ◽

Average Particle ◽

X Ray Diffraction ◽

Transmission Electron ◽

Visible Spectra ◽

Ft Ir

ZnO nanoparticles were synthesized by microemulsion route in W/S ratio of 5 at room temperature. X-ray diffraction (XRD) pattern reveals wurtzite structure of ZnO nanoparticles. Rod shape of ZnO nanoparticles of average particle size 10.0 to 12.0 nm were observed by transmission electron microscopy. FT-IR spectra confirmed the adsorption of surfactant molecules at the surface of ZnO nanoparticles and presence of Zn-O bonding. Thermal studies were carried out by the differential scanning calorimeter (DSC) techniques. In addition, UV-Visible spectra were employed to estimate the band gap energy of ZnO nanoparticles.

Download Full-text

EFFECT OF OPERATIONAL PARAMETERS ON PHOTOCATALYTIC DEGRADATION OF TOLUIDINE BLUE UTILIZING BiOCl NANOPLATES IN SOLAR LIGHT

International Journal of Engineering Technologies and Management Research ◽

10.29121/ijetmr.v4.i12.2017.590 ◽

2020 ◽

Vol 4 (12) ◽

pp. 43-54

Author(s):

Brijesh Pare ◽

Vaishali Joshi ◽

Satish Piplode

Keyword(s):

Photocatalytic Degradation ◽

Toluidine Blue ◽

Average Particle Size ◽

Solar Light ◽

Catalyst Loading ◽

Blue Dye ◽

Average Particle ◽

Operational Parameters ◽

X Ray Diffraction ◽

Sem Images

This work is devoted to the study of the effects of various operational parameters such asH2O2, K2S2O8, NaCl, Na2CO3, FeCl3, Fenton’s reagent, O2, N2 purging, effect of otherphotocatalysts on the photocatalytic degradation of toluidine blue dye by as synthesized nanoBiOCl under solar light in following conditions pH= 11, catalyst loading= 30 mg/100ml andinitial dye concentration= 4 × 10-5 mol L-1. Nano BiOCl was prepared by a simple hydrolysismethod at room temperature and characterized by X-ray diffraction (XRD) and HighResolution Field Emission Scanning Microscope (HR FESEM). XRD pattern suggested thatthe synthesized nano BiOCl was highly pure and crystalline, SEM images depicted theplatelike morphology of nano BiOCl. The average particle size of nano BiOCl was obtained as45 nm. It was observed that these operational parameters greatly influenced the rate ofphotocatalytic degradation. The optimum concentrations of oxidants, salts, FeCl3 andFenton’s reagent for photocatalysis of toluidine blue have also been obtained.

Download Full-text