Crystallite size dependence of band gap energy for electrodeposited ZnO grown at different temperatures

2006 ◽  
Vol 90 (15) ◽  
pp. 2356-2361 ◽  
Author(s):  
R.E. Marotti ◽  
P. Giorgi ◽  
G. Machado ◽  
E.A. Dalchiele
Keyword(s):  
Band Gap ◽  
Crystallite Size ◽  
Size Dependence ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Different Temperatures

A correlation for crystallite size of undoped ZnO thin film with the band gap energy – precursor molarity – substrate temperature

Optik ◽  
2014 ◽  
Vol 125 (3) ◽  
pp. 1303-1306 ◽  
Author(s):  
Said Benramache ◽  
Okba Belahssen ◽  
Ali Arif ◽  
Abderrazak Guettaf
Keyword(s):  
Thin Film ◽  
Substrate Temperature ◽  
Band Gap ◽  
Crystallite Size ◽  
Band Gap Energy ◽  
Zno Thin Film ◽  
Gap Energy

Effect of Li Substitution in MgO Nanostructured on Band Gap Energy via Combustion Synthesis Method

2020 ◽  
Vol 301 ◽  
pp. 97-102
Author(s):  
Nor Fadilah Chayed ◽  
Nurhanna Badar ◽  
Kelimah Elong ◽  
Norlida Kamarulzaman
Keyword(s):  
Band Gap ◽  
Crystallite Size ◽  
Synthesis Method ◽  
Combustion Method ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Gap Energy ◽  
Polyhedral Shape ◽  
Band Gap Narrowing ◽  
Li Substitution

Preparation of MgO and Mg0.9Li0.2O materials using self-propagating combustion method are done to investigate the effect of substitution doping on the band gap energy. The synthesis condition has been optimized to obtain pure and single phase of MgO and Mg0.9Li0.2O materials and was confirmed by X-Ray Diffraction (XRD). The morphology obtained from field emission scanning electron microscopy (FESEM) is spherical and rounded polyhedral shape with agglomeration of crystallites for MgO and Mg0.9Li0.2O materials respectively. The crystallite size of MgO and Mg0.9 Li0.2O samples is between 50 nm to 120 nm and 200 nm to 1500 nm respectively. The band gap was determined by UV-Vis NIR spectrophotometer and it was found that the band gap obtained for MgO nanostructure is 6.10 eV which is lower than bulk MgO of 7.8 eV. The presence of Li in the MgO had caused changes in morphology, crystallite size and band gap narrowing to 3.83 eV.

Semiconductor Pb2P2S6 and size-dependent band gap energy of its nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (65) ◽  
pp. 34288-34293 ◽  
Author(s):  
Xian Zhang ◽  
Jianqiao He ◽  
Wei Chen ◽  
Chao Wang ◽  
Chong Zheng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Ball Milling ◽  
High Speed ◽  
Size Dependence ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Size Dependent ◽  
Ball Milling Technique ◽  
High Speed Ball Milling

Microcrystalline Pb2P2S6 powder was synthesized via a traditional melting salt method. The nanostructured Pb2P2S6 powder was further synthesized by a high-speed ball milling technique. The optical properties of the Pb2P2S6 powder show a size-dependence, with the band gap ranging from 2.56 eV to 2.88).

scholarly journals Testing the Efficacy of the Synthesis of Iron Antimony Sulfide Powders from Single Source Precursors

Inorganics ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 61
Author(s):  
Fadiyah Makin ◽  
Dalal Alzahrani ◽  
Firoz Alam ◽  
Floriana Tuna ◽  
David J. Lewis
Keyword(s):  
Band Gap ◽  
Iron Sulfide ◽  
Nir Spectroscopy ◽  
Band Gap Energy ◽  
Single Source ◽  
Single Source Precursors ◽  
X Ray ◽  
Gap Energy ◽  
Antimony Sulfide ◽  
Different Temperatures

The antimony-iron sulfide system in general does not produce alloys below 540 °C from traditional solid-state methods. However, single source precursors have been known to produce unexpected products that arise from kinetically trapped polymorphs. In this paper, we test the efficacy of this approach toward the Fe-Sb-S system. Antimony and iron diethyldithiocarbamate complexes of the form Sb[S2CN(Et2)]3 (1) and Fe[S2CN(Et2)]3 (2) were synthesised, characterised, and used as single-source precursors for the preparation of Sb2S3, FexSy, and mixed iron antimony sulfide Sb2(1−x)Fe2xS3 (0 ≥ x ≥ 1) powders using the solvent-less thermolysis method at different temperatures ranging from 300 to 475 °C. The effect of different mole fractions of the iron precursor was evaluated on morphology, shape, and optical and magnetic properties of Sb2(1−x)Fe2xS3 (0 ≥ x ≥ 1). The obtained powders were characterized by X-ray diffraction (XRD), Raman spectroscopy scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, magnetometer measurement, and UV/vis/NIR spectroscopy. The results demonstrated that the crystalline structure, morphology, and elemental composition of the samples changed with the mole fraction of the precursor. There was significant phase separation between Sb and Fe sulfides noted from EDX spectroscopic mapping, yet an optoelectronic study monitoring the direct band gap energy of antimony sulfide shows that the band gap energy increases as a function of Fe content, which suggests limited alloying is possible from the single source route.

The Nanocrystallinity Enhancement and Optical Characteristics of Pre-Hydrothermally Treated ZnO Nanoparticles

2012 ◽  
Vol 557-559 ◽  
pp. 468-471 ◽  
Author(s):  
Akhmad Herman Yuwono ◽  
Ghiska Ramahdita ◽  
Nofrijon Sofyan
Keyword(s):  
Band Gap ◽  
Crystallite Size ◽  
Hydrothermal Treatment ◽  
Zno Nanoparticles ◽  
Treatment Duration ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Nanocrystallite Size ◽  
Gel Technique

In the current research, ZnO nanoparticles have been synthesized via sol-gel technique assisted by a pre-hydrothermal treatment at 150oC with various holding time of 0, 24, 48 and 72 hours. This route was specifically aimed at investigating the effect of this treatment on the nanocrystallite size, crystallinity and band gap energy of the resulting nanoparticles. The results of investigation showed that an increasing of pre-hydrothermal treatment duration from 0 to 72 hours has increased the crystallite size of ZnO nanoparticles from 3.47 to 13.85 nm, and decreased the band gap energy from 3.10 to 3.08 eV.

Band Gap Narrowing of MgO and Mg0.95Zn0.05O Nanostructures

2020 ◽  
Vol 307 ◽  
pp. 273-278
Author(s):  
Nor Fadilah Chayed ◽  
Nurhanna Badar ◽  
Kelimah Elong ◽  
Norlida Kamarulzaman
Keyword(s):  
Band Gap ◽  
Crystallite Size ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Band Gap Energy ◽  
Synthesis Condition ◽  
Gap Energy ◽  
Band Gap Narrowing ◽  
Effect Of Doping

Preparation of MgO and Mg0.95Zn0.05O nanomaterials using self-propagating combustion method are done to investigate the effect of doping on the band gap energy. The synthesis condition has been optimized to obtain pure MgO and Mg0.95Zn0.05O materials which confirmed by XRD. FESEM results shows agglomeration of crystallite with average crystallite size of samples between 30 nm to 125 nm. The band gap obtained from the measurement of UV-Vis NIR spectrophotometer for MgO nanostructure is 6.36 eV which is lower than bulk MgO of 7.8 eV. The presence of Zn in Mg0.95Zn0.05O sample causes the narrowing of band gap to 5.33 eV.

Cu-Doped SnO2 Nanoparticles: Synthesis and Properties

2019 ◽  
Vol 19 (11) ◽  
pp. 7139-7148 ◽  
Author(s):  
Suresh Sagadevan ◽  
Zaira Zaman Chowdhury ◽  
Mohd. Rafie Bin Johan ◽  
Fauziah Abdul Aziz ◽  
L. Selva Roselin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Band Gap ◽  
Chemical Constituents ◽  
Sno2 Nanoparticles ◽  
Impedance Analysis ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Electrical And Magnetic Properties ◽  
Different Temperatures ◽  
Co Precipitation

In this work, a simple, co-precipitation technique was used to prepare un-doped, pure tin oxide (SnO2). As synthesized SnO2 nanoparticles were doped with Cu2+ ions. Detailed characterization was carried out to observe the crystalline phase, morphological features and chemical constituents with opto-electrical and magnetic properties of the synthesized nanoparticles (NPs). X-ray diffraction analysis showed the existence of crystalline, tetragonal structure of SnO2. Both the sample synthesized here showed different crystalline morphology. The band gap energy (Eg) of the synthesized sample was estimated and it was found to decrease from 3.60 to 3.26 eV. The band gap energy reduced due to increase in Cu2+ dopant amount inside the SnO2 lattice. Optical properties were analyzed using absorption spectra and Photoluminescence (PL) spectra. It was observed that Cu2+ ions incorporated SnO2 NPs exhibited more degradation efficiencies for Rhodamine B (RhB) dye compared to un-doped sample under UV-Visible irradiation. The dielectric characteristics of un-doped, pure and Cu2+ incorporated SnO2 nanoparticles were studied at different frequency region under different temperatures. The ac conductivity and impedance analysis of pure and Cu2+ incorporated SnO2 nanoparticles was also studied. The magnetic properties of the synthesized samples were analysed. Both the sample showed ferromagnetic properties. The research indicated that the Cu2+ ions doping can make the sample a promising candidate for using in the field of optoelectronics, magneto electronics, and microwave devices.

Effect of Cu Doped in MgO on Nanostructures and their Band Gap Energies

2019 ◽  
Vol 290 ◽  
pp. 323-328 ◽  
Author(s):  
Nor Fadilah Chayed ◽  
Norlida Kamarulzaman ◽  
Nurhanna Badar ◽  
Kelimah Elong
Keyword(s):  
Band Gap ◽  
Crystallite Size ◽  
Single Phase ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gap Energy ◽  
Scanning Electron

Doping of the materials with other metals or transition metals will modify the properties of the nanomaterials. In this work, MgO and Cu doped MgO which are Mg0.95Cu0.05O and Mg0.90Cu0.10O nanomaterials are synthesized using a self-propagating combustion method. The samples are annealed at 900 °C for 24 hours. The phase and purity of the synthesized samples are studied using X-Ray Diffraction (XRD) and the result revealed that the samples are pure and single phase. The morphology and crystallite size of the pure samples are examined using Field Emission Scanning Electron Microscope (FESEM). The result shows polyhedral morphology with agglomeration of crystallite and average crystallite size of the samples is between 40 to 210 nm. The band gap obtained for MgO nanostructures is 6.38 eV which is lower than bulk MgO of 7.8 eV. The presence of Cu causes the narrowing the band gap energy of Mg0.95Cu0.05O and Mg0.90Cu0.10O samples to 4.28 eV and 3.35 eV respectively.

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