scholarly journals Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

2016 ◽  
Vol 34 (4) ◽  
pp. 819-827 ◽  
Author(s):  
Vaibhav Koutu ◽  
Lokesh Shastri ◽  
M. M. Malik
Keyword(s):  
Raman Spectroscopy ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Zno Nanoparticles ◽  
Visible Spectrum ◽  
Hexagonal Wurtzite Structure ◽  
Peak Shift ◽  
Precipitation Method ◽  
Synthesis Process ◽  
Co Precipitation

AbstractIn the present work, powder zinc oxide samples were prepared by varying NaOH concentration (0.1 M – 0.4 M) using wet-chemical co-precipitation method. As-synthesized ZnO was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL) and Raman spectroscopy. Formation of hexagonal wurtzite structure of the ZnO samples has been revealed from XRD studies. This study further suggests reduction in crystallite size from 40 nm to 23 nm with an increase in NaOH concentration which is confirmed by FESEM. PL and Raman spectroscopy studies of these samples show significant peak shift towards the higher and lower energy respectively, with maximum PL emission between 400 nm and 470 nm region of the visible spectrum. Noticeable inverse relationship between optical properties of ZnO nanoparticles and NaOH concentration may be attributed to the rapid nucleation during the synthesis process. With these remarkable properties, ZnO nanoparticles may find applications in nanoelectronic devices, sensors, nanomedicine, GATE dielectrics, photovoltaic devices, etc.

Physical and Optical Properties of Indium Oxide: Tin Nanoparticles Synthesized by Co-Precipitation Method

2015 ◽  
Vol 659 ◽  
pp. 604-608 ◽  
Author(s):  
Jiruntanin Kanoksinwuttipong ◽  
Wisanu Pecharapa ◽  
Russameeruk Noonuruk ◽  
Wicharn Techitdheera
Keyword(s):  
Optical Properties ◽  
Single Phase ◽  
Precipitation Method ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
Optical Absorbance ◽  
Molar Ratios ◽  
Tin Nanoparticles ◽  
Ion Substitution ◽  
Co Precipitation

Indium oxide:tin nanoparticles were synthesized by co-precipitation method using InCl3 and SnCl4·5H2O as starting precursor with different molar ratios of Sn:In. The crystalline structure, optical properties, chemical bonding and morphologies of all samples were characterized by X-ray diffraction (XRD), UV–vis spectrometer, Raman spectroscopy and field emission scanning electron microscope, respectively. The XRD results show that the crystallinity of as-synthesized powders was initially amorphous phase. After calcination at 400 °C for 2 h, a single phase ITO powder with 10% (mol%) SnO2 was obtained. The particle size of each sample is approximately 20-25 nm. The color of indium oxide:tin nanopowders after heat treatment changed from white to yellow due to the substitution of oxygen vacancies in the sample. After calcination, the intensity of Raman peak significantly decreased with increasing amount of Sn loading. This phenomenon indicates that ion substitution may occur during the synthesis process. Moreover, it is noticed that the optical absorbance of obviously changed with increasing Sn loading.

Structural and Dielectric Properties of Zn1-xMoxO Nanoparticles

2020 ◽  
Vol 13 (2) ◽  
pp. 165-170
Keyword(s):  
Zinc Oxide ◽  
Dielectric Properties ◽  
Ac Conductivity ◽  
Hexagonal Wurtzite Structure ◽  
Dielectric Constants ◽  
Precipitation Method ◽  
Dielectric Parameters ◽  
Mo Doping ◽  
Lcr Meter ◽  
Co Precipitation

Abstract: In this work, samples of zinc oxide nanoparticles doped by molybdenum (Zn1-xMoxO with 0 ≤ x ≤ 0.1) were prepared by using the wet co-precipitation method. The characterization of the prepared samples was carried out by means of X-ray powder diffraction (XRD). The samples reserved their hexagonal wurtzite structure with Mo doping and showed a decrease in the crystallite size up to x = 0.04 followed by a further increase. On the other hand, dielectric measurements were performed using an LCR meter. The effect of frequency and temperature on the dielectric properties such as the real and imaginary parts of dielectric constant (ε^' and ε'', respectively), dielectric loss (tanδ) and ac-conductivity (σ_ac) of Mo-doped zinc oxide samples, was studied in the frequency range (100 Hz - 1 MHz) and at temperatures (300 - 773 K). The values of room temperature dielectric parameters were found to be strongly dependent on the Mo-doping. However, the increase in temperature caused an enhancement in the values of the dielectric parameters, particularly at 773 K. Keywords: Zinc oxide, XRD, Dielectric constants, Ac-conductivity.

scholarly journals Estimation of Particle Size and Band Gap of Zinc Oxide Nanoparticle Synthesized by Chemical Precipitation Method

2020 ◽  
Vol 41 (1) ◽  
pp. 46-50
Author(s):  
Surendra K. Gautam ◽  
Bibek Sapkota ◽  
Arun Bhujel ◽  
Sitaram Bhattarai
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Band Gap ◽  
Zno Nanoparticles ◽  
Hexagonal Wurtzite Structure ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
X Ray ◽  
Uv Visible

Zinc oxide (ZnO) nanoparticles were synthesized by chemical precipitation method using 0.1M and 0.3M [Zn(NO3)2.6H2O] and Na2CO3 solutions. The particle size and band gap of ZnO nanoparticles were estimated and effect of concentration on it was investigated. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), Energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and UV-visible spectroscopy. The XRD result revealed that synthesized ZnO nanoparticles have pure hexagonal wurtzite structure and the particle size varies from 27.0 nm to 29.9 nm estimated by using Debye-Scherrer’s equation. The TEM image also projected the average particle size in the range of 20-30 nm and selected area electron diffraction (SAED) further verified the formation of hexagonal wurtzite structure. The FTIR result showed a broad absorption band related to Zn-O vibration band. The UV-visible absorption showed a red shift in the absorption edge with increasing concentration of Zn(NO3)2.6H2O solution. The sizes and band gaps of ZnO nanoparticles increased and decreased, respectively with increasing concentration of Zn(NO3)2.6H2O solution from 0.1M to 0.3M.

scholarly journals Using Co-Precipitation Method Determining Synthesis and Characterization of Fe Doped Zinc Oxide Nanoparticles

2019 ◽  
Vol 8 (9S3) ◽  
pp. 705-707
Keyword(s):  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Chemical Precipitation ◽  
Zinc Nitrate ◽  
Precipitation Method ◽  
Ferric Nitrate ◽  
Doped Zno ◽  
Co Precipitation

In through concoction co-precipitation strategy using ferric nitrate, zinc nitrate and sodium hydroxide in fluid arrangements, orchestrate and portrayal of Fe doped ZnO nanoparticles were prepared in the present work. X-beam diffraction has confirmed the growth of Fe doped ZnO from the precursor. This result has revealed that nanoparticles have integrated excellent crystalline forces in nature. SEM investigations show that ZnO nanoparticles have been doped by the round and minimally agglomerated Fe. Room temperature powerless ferromagnetism, distinctive in the appealing characteristics of Fe doped ZnO powderKeywords in relation to room temperature: zinc oxide, SEM, chemical precipitation, XRD, VSM

Influence of Iron Dopant on Structure, Surface Morphology and Optical Properties of ZnO Nanoparticles

2009 ◽  
Vol 67 ◽  
pp. 245-250 ◽  
Author(s):  
Esther Elizabeth ◽  
Rajeswari Yogamalar ◽  
Srinivasan Ramasamy ◽  
Arumugam Chandra Bose
Keyword(s):  
Optical Properties ◽  
Zno Nanoparticles ◽  
Photo Luminescence ◽  
Precipitation Method ◽  
Average Particle ◽  
Structure Surface ◽  
Co Precipitation ◽  
Structural Characterizations ◽  
Fe Addition

Pure and two different concentration of Iron (Fe) doped Zinc Oxide (ZnO) nanoparticles (Zn(1-x)FexO) with x = 0.03 and 0.05 were synthesized by chemical co-precipitation method. The structural characterizations of the samples were done by X-ray powder Diffraction (XRD) and Scanning Electron Microscopy (SEM). XRD data indicate that the replacement of Zn2+ ion by Fe3+ ion does not influence the wurtzite structure of ZnO samples. With increase in annealing temperature the intensity of the Zn(1-x)FexO (0 0 2) diffraction peak increases, indicating that the crystallinity quality of the particle improves. Using Scherrer equation the average particle sizes of Zn(1-x)FexO are calculated. The strain-induced broadening at Full Width Half Maximum (FWHM) of the XRD profile of Zn(1-x)FexO were estimated from Williamson Hall (W-H) plot. The results of SEM apparently show that the sample comprises of highly agglomerated particles with no definite shape. Optical absorption Ultraviolet-visible (UV-vis) and Photo Luminescence (PL) properties have been characterized and the effect of Fe addition on optical properties of ZnO has been discussed.

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