scholarly journals Effects of Ambience on Thermal-Diffusion Type Ga-doping Process for ZnO Nanoparticles

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 57
Author(s):  
Md Maruful Islam ◽  
Toshiyuki Yoshida ◽  
Yasuhisa Fujita
Keyword(s):  
Sheet Resistance ◽  
Thermal Diffusion ◽  
Arc Discharge ◽  
Atmospheric Effects ◽  
Zno Nanoparticle ◽  
Zno Nps ◽  
Diffusion Type ◽  
Transistor Channel ◽  
Doped Zno ◽  
Ga Doping

Various annealing atmospheres were employed during our unique thermal-diffusion type Ga-doping process to investigate the surface, structural, optical, and electrical properties of Ga-doped zinc oxide (ZnO) nanoparticle (NP) layers. ZnO NPs were synthesized using an arc-discharge-mediated gas evaporation method, followed by Ga-doping under open-air, N2, O2, wet, and dry air atmospheric conditions at 800 °C to obtain the low resistive spray-coated NP layers. The I–V results revealed that the Ga-doped ZnO NP layer successfully reduced the sheet resistance in the open air (8.0 × 102 Ω/sq) and wet air atmosphere (8.8 × 102 Ω/sq) compared with un-doped ZnO (4.6 × 106 Ω/sq). Humidity plays a key role in the successful improvement of sheet resistance during Ga-doping. X-ray diffraction patterns demonstrated hexagonal wurtzite structures with increased crystallite sizes of 103 nm and 88 nm after doping in open air and wet air atmospheres, respectively. The red-shift of UV intensity indicates successful Ga-doping, and the atmospheric effects were confirmed through the analysis of the defect spectrum. Improved electrical conductivity was also confirmed using the thin-film-transistor-based structure. The current controllability by applying the gate electric-field was also confirmed, indicating the possibility of transistor channel application using the obtained ZnO NP layers.

scholarly journals p-Channel and n-Channel Thin-Film-Transistor Operation on Sprayed ZnO Nanoparticle Layers

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Daiki Itohara ◽  
Kazato Shinohara ◽  
Toshiyuki Yoshida ◽  
Yasuhisa Fujita
Keyword(s):  
Thin Film ◽  
Arc Discharge ◽  
Thin Film Transistor ◽  
Chamber Pressure ◽  
Zno Nanoparticle ◽  
Zno Nps ◽  
Lower Chamber ◽  
Hall Effect Measurements ◽  
Particle Process ◽  
P Type

Both n-channel and p-channel thin-film transistors have been realized on ZnO nanoparticle (NP) layers sprayed onto quartz substrates. In this study, nitrogen-doped ZnO-NPs were synthesized using an arc-discharge-mediated gas-evaporation method that was recently developed. Sprayed NP layers were characterized by scanning electron microscopy and Hall effect measurements. It was confirmed that p-type behaving NP layers can be obtained using ZnO-NPs synthesized with lower chamber pressure, whereas n-type conductivity can be obtained with higher chamber pressure. pn-junction diodes were also tested, resulting in clear rectifying characteristics. The possibility of particle-process-based ZnO-NP electronics was confirmed.

scholarly journals Effect of silver doping on structural and photocatalytic circumstances of ZnO nanoparticles

2020 ◽  
pp. 13-20
Author(s):  
Luma Ahmed ◽  
Eitemad S. Fadhil ◽  
Ayad F. Mohammed
Keyword(s):  
Zno Nanoparticles ◽  
Precipitation Method ◽  
Methyl Green ◽  
Zno Nanoparticle ◽  
Zno Nps ◽  
Force Microscopy ◽  
Ft Ir ◽  
Doped Zno ◽  
Co Precipitation ◽  
Artificial Uv

This article describes the synthesis of ZnO nanoparticles (Nps) using the co-precipitation method and then calcinated at 500oC for 2 h. The photo activity of ZnO nanoparticles was examined in photo decolorization of methyl green dye under artificial UV -A light. This prepared photocatalyst (ZnO Np) was modified his surface by 2% Ag doped using the photo deposition method under inert gas for 3h. The characterization of undoped and 2% Ag doped ZnO Nps were estimated by Fourier-transform infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), and Atomic force microscopy (AFM). In FT-IR analysis, the new peaks occurred around 624-778 cm-1 confirmed the Ag really is doped on prepared ZnO Np. Based on data from XRD, the mean crystal size was reduced with doped the 2% Ag. The AFM images for the prepared photocatalysts ensure that the shapes of all samples are semi-spherical with nanometer size. Series of kinetics experiments were performed for the photocatalytic decolourization of methyl green dye using undoped and 2% Ag doped ZnO nanoparticle and found to be pseudo-first-order kinetics.

Photoluminescence and Raman spectra in Ga-doped ZnO layers on sapphire

2007 ◽  
Vol 1035 ◽  
Author(s):  
Michael A. Reshchikov ◽  
S. Nagata ◽  
J. Xie ◽  
B. Hertog ◽  
A. Osinsky
Keyword(s):  
Raman Spectra ◽  
Room Temperature ◽  
Molecular Beam ◽  
Exciton Peak ◽  
Deep Acceptor ◽  
Sapphire Substrates ◽  
Related Defect ◽  
Doped Zno ◽  
Ga Doping ◽  
Zn Vacancy

AbstractGa-doped ZnO layers were grown on sapphire substrates by molecular beam epitaxy (MBE). Low-temperature photoluminescence (PL) and room-temperature Raman spectra were investigated. Defect-related modes at 277 and 510 cm−1 appeared in the Raman spectrum for Ga-doped layers. The PL spectrum is dominated by a donor-bound exciton peak at 3.356 eV. A weak yellow luminescence (YL) band peaking at 2.1-2.2 eV was studied in detail. It shifted to higher photon energies (up to 0.1 eV) with increasing excitation intensity. The YL band is attributed to transitions from shallow donors to a deep acceptor. The acceptor is thought to be a Zn vacancy-related defect because the intensity of the YL band decreased dramatically with Ga doping.

Fabrication of Highly Hydrophobic Polyurethane Foam for the Oil-Absorption Application

2014 ◽  
Vol 809-810 ◽  
pp. 169-174 ◽  
Author(s):  
Jun Liu ◽  
Meng Jie Chang ◽  
Menken Tenggeer ◽  
Hui Ling Du
Keyword(s):  
Absorption Capacity ◽  
Future Application ◽  
Organic Liquids ◽  
Zno Nanoparticle ◽  
Oil Absorption ◽  
Zno Nanorod ◽  
Acid Modification ◽  
Zno Nps ◽  
Oil Absorbent ◽  
Highly Hydrophobic

Hydrophobic polyurethane (PU) sponge for oil absorption application was fabricated by ZnO nanomaterial coating and stearic acid modification on ZnO surface. The contact angle and oil absorbent capacity ability of the obtained sponge were measured. It was demonstrated that both ZnO nanoparticle and ZnO nanorod coated PU sponge (ZnO NPs-PU and ZnO NRs-PU) showed good hydrophobicity and oil absorbent ability. ZnO NPs-PU and ZnO NRs-PU sponges have absorbent capacities of 18~92 times and 20~98 times of their own weight for different organic liquids, respectively. Moreover, the absorption capacity of the ZnO NRs-PU sponge did not deteriorate over 50 cycles. Therefore, the ZnO NRs-PU sponge has excellent recyclability for future application.

On 3D printing of electro-active PVDF-Graphene and Mn-doped ZnO nanoparticle-based composite as a self-healing repair solution for heritage structures

2021 ◽  
pp. 095440542110609
Author(s):  
Vinay Kumar ◽  
Rupinder Singh ◽  
Inderpreet Singh Ahuja
Keyword(s):  
3D Printing ◽  
Polyvinylidene Fluoride ◽  
Nano Particles ◽  
Zno Nanoparticle ◽  
Self Healing ◽  
Fused Deposition ◽  
Crack Repair ◽  
3D Printed ◽  
Doped Zno ◽  
Mn Doped

Construction is the part of human activity which is directly linked to urbanization for moving ahead on the path of growth and prosperity. Construction activities in past centuries are now part of our precious heritage. The repair and maintenance of heritage structures are of great importance for present-day researchers. One of the most common damage these century-long constructions faces are in form of surface cracks. In the present study, investigations were performed for a 3D printing-based customized solution for crack repair and maintenance of heritage structures. In this study, polyvinylidene fluoride (PVDF) polymer was reinforced with graphene (Gr) and Mn-doped ZnO nano-particles to prepare a smart composite material for crack repair and restoration. The composite was successfully 3D printed on fused deposition modeling (FDM) based 3D printer after investigating its rheological, thermal, and mechanical properties. The in-house developed composite was tested for smart characteristics to use as a programmable solution for filling cracks. The piezoelectric property and dielectric constant of 3D printed disk-shaped composite (PVDF-Gr-Mn-ZnO) were obtained after DC poling (to be used as stimulus) of the functional prototype. The results of the study suggest that the electro-active nature, volumetric change, and charge storing capacity of the additively manufactured composite may be used practically to acquire the shape of cavity/crack present in the constructed wall and repair the damages that occurred in a heritage site. The photoluminescence (PLS) and atomic force microscopy (AFM) analysis was used to ascertain the properties of the prepared composite. Also, the results obtained from the morphological analysis are reported to support the outcomes of the research.

Antibacterial Activity of Nickel -Doped ZnO\MWCNTs hybrid Prepared by Sol-Gel technique

2021 ◽  
Author(s):  
Selma M.H. AL-Jawad ◽  
Zahraa S. Shakir ◽  
Duha S. Ahmed
Keyword(s):  
Antibacterial Activity ◽  
Sol Gel ◽  
Inhibition Zone ◽  
Sem Analysis ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Zno Nps ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Doped Zno

ZnO/MWCNTs hybrid and doped with different concentration of Nickel element prepared by using Sol-gel been technique reported. All samples were prepared and characterized by X-Ray Diffraction Analysis (XRD), Energy Dispersive X-ray Spectroscopy (EDS), Fourier-Transform Infrared Spectroscopy (FTIR), Field-Emission Scanning Electron Microscopy (FE-SEM), and UV-Vis spectroscopy have been identified the structural, optical and morphological properties. X-ray diffraction showed the polycrystalline nature with hexagonal wutzite structure of hybrid and doped with Nickel. The crystalline size of the hybrid nanostructure was increasing from 23.73 nm to 34.59 nm. Besides, the UV-Vis spectroscopy showed a significant decrease in the band gap values from 2.97 eV to 2.01 eV. Whereas the FE-SEM analysis confirm the formation spherical shapes of ZnO NPs deposited on cylindrical tubes representing the MWCNTs. The antibacterial activity reveals that the inhibition zone of Ni doped-ZnO/MWCNTs hybrid was 28.5 mm, 26.5 mm toward E. coli and S. aureus bacteria, respectively.

scholarly journals The investigation of the parameters affecting the ZnO nanoparticle cytotoxicity behaviour: a tutorial review

2020 ◽  
Vol 8 (22) ◽  
pp. 6157-6174
Author(s):  
Marta Canta ◽  
Valentina Cauda
Keyword(s):  
Zno Nanoparticle ◽  
Zno Nps ◽  
Practical Guide ◽  
Promising Application ◽  
Biomedical Field

The promising application of ZnO NPs in the biomedical field is threatened by their complex cytotoxic behaviour. This tutorial review is an experimental and practical guide for the scientists who explore this intriguing topic.

Absence of ferromagnetism in Co-doped ZnO prepared by thermal diffusion of Co atoms

2006 ◽  
Vol 100 (4) ◽  
pp. 043909 ◽  
Author(s):  
Z. Zhang ◽  
Q. Chen ◽  
H. D. Lee ◽  
Y. Y. Xue ◽  
Y. Y. Sun ◽  
...  
Keyword(s):  
Thermal Diffusion ◽  
Doped Zno ◽  
Co Doped
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