scholarly journals Physical properties of carbon nanowalls synthesized by the ICP-PECVD method vs. the growth time

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yerassyl Yerlanuly ◽  
Rakhymzhan Zhumadilov ◽  
Renata Nemkayeva ◽  
Berik Uzakbaiuly ◽  
Almaz R. Beisenbayev ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Physical Properties ◽  
Photoelectron Spectroscopy ◽  
Hall Effect Measurement ◽  
Growth Time ◽  
Optical And Electrical Properties ◽  
X Ray ◽  
Thermoelectric Measurements ◽  
Vis Spectroscopy ◽  
Carbon Nanowalls

AbstractInvestigation of the physical properties of carbon nanowall (CNW) films is carried out in correlation with the growth time. The structural, electronic, optical and electrical properties of CNW films are investigated using electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, UV–Vis spectroscopy, Hall Effect measurement system, Four Point Probing system, and thermoelectric measurements. Shorter growth time results in thinner CNW films with a densely spaced labyrinth structure, while a longer growth time results in thicker CNW films with a petal structure. These changes in morphology further lead to changes in the structural, optical, and electrical properties of the CNW.

Cl Doping Effect by Thermal Treatment with KCl for ZnO Single Crystals

2011 ◽  
Vol 1288 ◽  
Author(s):  
Akira Fujimoto ◽  
Yoshiyuki Harada
Keyword(s):  
Electrical Properties ◽  
Thermal Treatment ◽  
Single Crystals ◽  
Surface State ◽  
Photoelectron Spectroscopy ◽  
Coated Sample ◽  
Optical And Electrical Properties ◽  
Donor Concentration ◽  
Uncoated Sample ◽  
X Ray

ABSTRACTWe investigated the optical and electrical properties of ZnO single crystals coated with KCl by examining the photoluminescence (PL) at 9 K and the temperature dependence of the carrier concentration. The band-edge PL intensity of the KCl-coated sample was much larger than that of the uncoated sample. Moreover, a substantial increase in Hall electrons was observed in the coated sample. X-ray photoelectron spectroscopy revealed bonding between chlorine and zinc atoms in the coated sample. Therefore, coating the surface of ZnO single crystals with KCl enhances the donor concentration and improves the surface state.

scholarly journals A Comparative Study of Structural, Optical and Electrical Properties of Fe-ZnO Nanoparticles Synthesized by Precipitation and Microwave Method for Photovoltaic Applications

2021 ◽  
Vol 03 (03) ◽  
pp. 1-1
Author(s):  
Ganga R. Neupane ◽  
◽  
Amrit Kaphle ◽  
David N. Mcllroy ◽  
Elena Echeverria ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Structural Properties ◽  
Zno Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Electrical Transport ◽  
Precipitation Method ◽  
Microwave Method ◽  
Optical And Electrical Properties ◽  
Electrical Transport Properties ◽  
X Ray

Iron doped ZnO (Fe-ZnO) nanoparticles were synthesized using two techniques that are economical as well as scalable to yield tunable properties of nanoparticles for facilitating down conversion in an absorbing layer of a solar cell. To evaluate the suitability of Fe-ZnO nanoparticles prepared by two deposition methods, we present a comparison of optical, electrical, and structural properties of Fe-ZnO using several experimental techniques. Structural properties were analyzed using transmission electron microscopy and x-ray diffraction spectroscopy (XRD) with Rietveld analysis for extracting information on compositional variations with Fe doping. The chemical composition of nanoparticles was analyzed through X-ray photoelectron spectroscopy (XPS). The optical properties of nanoparticles were studied using photoluminescence and UV-Vis absorption spectroscopy. In addition, fluorescence lifetime measurement was also performed to study the changes in an exponential decay of lifetimes. The electrical transport properties of Fe-ZnO were analyzed by impedance spectroscopy. Our studies indicate that ethanol as a solvent in a microwave method would produce smaller nanoparticles up to the size of 11 nm. In contrast, the precipitation method produces secondary phases of Fe2O3 beyond 5% doping. In addition, our studies show that the optical and electrical properties of resulting Fe-ZnO nanoparticles depend on the particle sizes and the synthesis techniques used. These new results provide insight into the role of solvents in fabricating Fe-ZnO nanoparticles by precipitation and microwave methods for photovoltaic and other applications.

scholarly journals Laser power density effect on the properties of Sb2S3 thin films prepared by pulsed laser assisted chemical bath deposition

2019 ◽  
pp. 1-6
Author(s):  
Nabile Edith Rodríguez-García ◽  
Felipe Adrián Vázquez-Gálvez ◽  
Fernando Estrada-Saldaña ◽  
Israel Hernández-Hernández
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Chemical Bath Deposition ◽  
Irradiation Time ◽  
Sodium Thiosulfate ◽  
Optical And Electrical Properties ◽  
Deposition Technique ◽  
X Ray ◽  
Antimony Sulfide ◽  
Vis Spectroscopy

Antimony Sulfide (Sb2S3) thin films were prepared using the laser assisted chemical bath deposition technique. The precursors used in the chemical bath were antimony chloride and sodium thiosulfate, the deposit was made at room temperature on glass substrate, while it was irradiated with a wavelength of 532 nm of the pulsed Nd:YAG laser. In this work, we studied the effects of energy density (1.97 x 107 and 7.07 x 106 W/cm2) and the irradiation time (30, 45 and 60 min) during the deposition process on the structure and the optical and electrical properties of the antimony sulfide films. The structure, composition, and optical and electrical properties were analyzed by X-Ray Diffraction (XRD), Raman Spectroscopy and X-Ray Emitted Photoelectron Spectroscopy (XPS), UV-Vis spectroscopy and photoconductivity. The results showed that the laser assisted chemical deposition technique is an effective synthesis technique for obtaining thin films of antimony sulfide for optoelectronic applications or in solar cells.

scholarly journals Measurements of Microstructural, Chemical, Optical, and Electrical Properties of Silicon-Oxygen-Nitrogen Films Prepared by Plasma-Enhanced Atomic Layer Deposition

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1008 ◽  
Author(s):  
Hong-Ping Ma ◽  
Hong-Liang Lu ◽  
Jia-He Yang ◽  
Xiao-Xi Li ◽  
Tao Wang ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Atomic Layer Deposition ◽  
Oxygen Concentration ◽  
Photoelectron Spectroscopy ◽  
Atomic Layer ◽  
Band Gap Energy ◽  
Optical And Electrical Properties ◽  
X Ray ◽  
Layer Deposition ◽  
Effect Of Oxygen

In this study, silicon nitride (SiNx) thin films with different oxygen concentration (i.e., SiON film) were precisely deposited by plasma enhanced atomic layer deposition on Si (100) substrates. Thus, the effect of oxygen concentration on film properties is able to be comparatively studied and various valuable results are obtained. In detail, x-ray reflectivity, x-ray photoelectron spectroscopy, atomic force microscopy, and spectroscopic ellipsometry are used to systematically characterize the microstructural, optical, and electrical properties of SiON film. The experimental results indicate that the surface roughness increases from 0.13 to 0.2 nm as the oxygen concentration decreases. The refractive index of the SiON film reveals an increase from 1.55 to 1.86 with decreasing oxygen concentration. Accordingly, the band-gap energy of these films determined by oxygen 1s-peak analysis decreases from 6.2 to 4.8 eV. Moreover, the I-V tests demonstrate that the film exhibits lower leakage current and better insulation for higher oxygen concentration in film. These results indicate that oxygen affects microstructural, optical, and electrical properties of the prepared SiNx film.

Effects of O2 Ambient on Structural, Optical and Electrical Properties of Hafnium Oxide Thin Films Prepared by E-Beam Evaporation

2010 ◽  
Vol 663-665 ◽  
pp. 413-416 ◽  
Author(s):  
Chen Yang ◽  
Zhi Ming Chen ◽  
Ying Xue Xi ◽  
Tao Lin
Keyword(s):  
Electrical Properties ◽  
Photoelectron Spectroscopy ◽  
Hafnium Oxide ◽  
High Dielectric Constant ◽  
Optical And Electrical Properties ◽  
X Ray ◽  
Low Leakage ◽  
Low Leakage Current ◽  
Evaporation Technique ◽  
High Dielectric

In this paper, thin HfO2 films were grown by using E-beam evaporation technique in vacuum and O2 ambient, respectively. Effects of O2 ambient on structural, optical and electrical properties of the HfO2 films were investigated by deploying x-ray photoelectron spectroscopy, ultraviolet visible spectroscopy, I-V and C-V characteristics. Results show that the O2 ambient deposited HfO2 films exhibited excellent structural, optical and electrical properties as compared with vacuum ambient HfO2 films, which especially performs a low content of metal Hf, a high transmittance, a low leakage current and a high dielectric constant.

Silver mirror reaction metallized chromatography paper for supercapacitor application

2021 ◽  
Author(s):  
I-Hsuan Chen ◽  
Jung-Hsien Chang ◽  
Ren-Jie Xie ◽  
Chia-Hui Tseng ◽  
Sheng-Rong Hsieh ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Photoelectron Spectroscopy ◽  
Cost Effective ◽  
Water Contact ◽  
X Ray ◽  
Supercapacitor Application ◽  
Resource Limited ◽  
Vis Spectroscopy ◽  
Silver Mirror ◽  
Silver Mirror Reaction

Abstract In this study, the easy-to-operate silver mirror reaction (SMR) was used for metallizing chromatography paper. The SMR-metallized paper was characterized by water contact angle measurements, a surface profiler, X-ray photoelectron spectroscopy, UV-vis spectroscopy, X-ray diffraction, and electrical resistance measurement. The characterization results show that Ag was successfully synthesized on cellulose fibers and was electrically conductive after cyclic bending. Moreover, this SMR-metallized paper was used as electrodes for fabricating a supercapacitor. This SMR-metallized paper could be used for realizing cost-effective flexible electronics applied in on-site biochemical sensing in resource-limited settings.

scholarly journals Effect Of Fluorine Doping On The Structural, Optical And Electrical Properties Of Spin Coated Tin Oxide Thin Films For Solar Cells Application

2019 ◽  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Electrical Properties ◽  
Tin Oxide ◽  
Transparent Conducting Oxide ◽  
Optical And Electrical Properties ◽  
Fluorine Doping ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transparent Conducting

Transparent conducting oxide (TCO) thin films are materials of significance for their applications in optoelectronics and sun powered cells. Fluorine-doped tin oxide (FTO) is an elective material in the advancement of TCO films. This paper reports the impact of fluorine doping on structural, optical and electrical properties of tin oxide thin films for solar cells application. The sol-gel was prepared from anhydrous stannous chloride, SnCl2 as an originator, 2-methoxyethanol as a solvent, di-ethanolamine as a preservative and ammonium fluoride as the dopant source. FTO precursor solution was formulated to obtain 0, 5, 10, 15 and 20 % doping concentration and deposited on glass substrates by means of spin coater at the rate of 2000 rpm for 40 seconds. After pre-heated at 200 oC, the samples were annealed at 600 oC for 2 h. The structural, optical and electrical characteristics of prepared films were characterized using X-ray diffraction (XRD) analysis, UV-visible spectroscopy and electrical measurement. X-ray diffraction (XRD) investigation of the films demonstrated that the films were polycrystalline in nature with tetragonal-cassiterite structure with most extraordinary pinnacle having a grain size of 17.01 nm. Doping with fluorine decreases the crystallite size. There was increment in the absorbance of the film with increasing wavelength and the transmittance was basically reduced with increasing fluorine doping in the visible region. The energy band gaps were in the range of 4.106-4.121 eV. The sheet resistance were observed to decrease as the doping percentage of fluorine increased with exception at higher doping of 15 and 20 %. In view of these outcomes, FTO thin films prepared could have useful application in transparent conducting oxide electrode in solar cell.

scholarly journals Microwave-assisted preparation of ZnS and ZnSe nanocrystals with different morphologies for photodegradation process of organic dyes

2019 ◽  
Author(s):  
Katarzyna Matras-Postolek ◽  
A. Zaba ◽  
S. Sovinska ◽  
D. Bogdal
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Organic Dyes ◽  
Zinc Sulphide ◽  
Conventional Heating ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Vis Spectroscopy

Zinc sulphide (ZnS) and zinc selenide (ZnSe) and manganese-doped and un-doped with different morphologies from 1D do 3D microflowers were successfully fabricated in only a few minutes by solvothermal reactions under microwave irradiation. In order to compare the effect of microwave heating on the properties of obtained  nanocrystals, additionally the synthesis under conventional heating was conducted additionally in similar conditions. The obtained nanocrystals were systematically characterized in terms of structural and optical properties using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance UV-Vis spectroscopy (DR UV-Vis), Fourier-transform infrared spectroscopy (FT-IR), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) surface area analysis. The photocatalytic activity of ZnSe, ZnS, ZnS:Mn and ZnSe:Mn nanocrystals with different morphologies was evaluated by the degradation of methyl orange (MO) and Rhodamine 6G (R6G), respectively. The results show that Mn doped NCs samples had higher coefficient of degradation of organic dyes under ultraviolet irradiation (UV).

Structural, Optical, and Electrical Properties of ZnO/Nb/ZnO Multilayer Thin Films

2014 ◽  
Vol 975 ◽  
pp. 238-242 ◽  
Author(s):  
Adolfo Henrique Nunes Melo ◽  
Petrucio Barrozo Silva ◽  
Marcelo Andrade Macedo
Keyword(s):  
Thin Films ◽  
Peak Position ◽  
Multilayer Thin Films ◽  
Optical And Electrical Properties ◽  
Zno Thin Film ◽  
Energy Band Gap ◽  
X Ray ◽  
Unit Cell Size ◽  
Vis Spectroscopy ◽  
Sputtering System

ZnO multilayers and pure ZnO thin films were deposited onto glass using a sputtering system, and were subsequently characterized by X-ray diffractometry and UV-Vis spectroscopy. The resistivity of the samples was measured by the four-probe method. All films exhibited preferential orientation along the c-axis and the peak position (002) shifted to a lower position, indicating a reduction in the unit cell size. The pure ZnO thin film exhibited a maximum transmittance of approximately 98%, which decreased as the Nb layer increased, thus increasing the absorbance of the multilayer thin films. The energy band gap decreased as the thickness of the metal increased which higher value was 3.18 eV. The resistivity had a minimum of 0.1 × 10-4 Ω m.

Inorganic-Framework Molecularly Imprinted CdS/TiO2 for Selectively Photocatalytic Degradation of Di (2-ethylhexyl) phthalate

2019 ◽  
Vol 41 (2) ◽  
pp. 308-308
Author(s):  
Fangyan Chen Fangyan Chen ◽  
Yiming Liu Yiming Liu ◽  
Xi Zhang Xi Zhang ◽  
Lina He and Yubin Tang Lina He and Yubin Tang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Tetrabutyl Titanate ◽  
Template Molecule ◽  
Molecularly Imprinted ◽  
X Ray ◽  
Simulated Solar Light ◽  
Specific Recognition ◽  
Vis Spectroscopy ◽  
Inorganic Framework ◽  
Ethylhexyl Phthalate

In order to improve the photocatalytic efficiency and selectivity of di (2-ethylhexyl) phthalate (DEHP) under solar-driven, the inorganic-framework molecularly imprinted CdS/TiO2, named as MIP-CdS/TiO2, was prepared by using DEHP as template molecule and tetrabutyl titanate as titanium source and functional monomer. The as-prepared MIP-CdS/TiO2 was characterized by scanning electron microscopy (SEM), X-ray energy spectrum (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV-Vis Spectroscopy (UV-vis), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectrum (PL). And the specific recognition and photocatalytic selectivity of MIP-CdS/TiO2 to DEHP were investigated. The results show that inorganic-framework molecular imprinting on the surface of CdS/TiO2 can result in existence of specific recognition sites of DEHP, extend and intensify the absorption visible light of CdS/TiO2, inhibit the recombination of the photo-induced electron-holes pairs. MIP-CdS/TiO2 has a specific recognition to DEHP. The binding selectivity coefficients of DEHP relative to its analogues DBP and DMP are 2.78 and 2.60, respectively. Compared with CdS/TiO2, MIP-CdS/TiO2 exhibits higher photocatalytic activity and selectivity for DEHP. Under simulated solar light irradiation, the degradation efficiency of DEHP photocatalyzed by MIP-CdS/TiO2 is 75.5%, which is 1.63 times as high as that of DEHP photocatalyzed by CdS/TiO2.

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