yttrium doping
Recently Published Documents


TOTAL DOCUMENTS

94
(FIVE YEARS 33)

H-INDEX

18
(FIVE YEARS 4)

2021 ◽  
Vol 242 (1) ◽  
Author(s):  
D. Banerjee ◽  
C. C. Dey ◽  
R. Sewak ◽  
S. V. Thakare ◽  
D. Toprek

Optik ◽  
2021 ◽  
pp. 168105
Author(s):  
I. Loyola Poul Raj ◽  
S. Valanarasu ◽  
Ahmed A. Abdeltawab ◽  
Sayed Z. Mohammady ◽  
Mohd Ubaidullah ◽  
...  

2021 ◽  
Author(s):  
K. Ravichandran ◽  
A. Jansi Santhosam ◽  
M. Aldossary Omar ◽  
Mohd Ubaidhulla

Abstract Yttrium (Y) doped (doping concentration - 0, 1, 3 and 5 wt%) ZnO thin films were deposited using spray pyrolysis technique. The structural, surface morphological, optical and compositional properties were analysed using X-Ray diffraction (XRD), Atomic Force Microscopy (AFM), UV-vis NIR spectrophotmetry (UV), photoluminescence study (PL) and elemental composition analysis. Ammonia vapour sensing properties such as response/recovery, stability and repeatability were studied at room temperature. XRD results confirmed that the prepared samples have hexagonal wurtzite structure. ZnO:Y thin film with 5 wt% yttrium doping exhibits excellent sensing response of 99, fast response/recovery times of 29 s/ 7 s which may be due to the existence of oxygen vacancies in the case of ZnO:Y (5 wt%) film sample confirmed by photoluminescence (PL) study. These oxygen vacancies attract more electrons and thus enhance the gas sensing. In addition, increase in the number of active sites caused by the substitution of Y3+(trivalent) ions into the Zn2+ (divalent) regular sites as confirmed by the observed M-B (Moss-Burstein) effect also causes an enhancement in the gas sensing. Surface roughness, another reason for the enhanced sensitivity, has been confirmed by AFM.


2021 ◽  
Author(s):  
T.H AlAbdulaal ◽  
Manal AlShadidi ◽  
Mai Hussien ◽  
Ganesh Vanga ◽  
Abdel-Fatah Bouzidi ◽  
...  

Abstract In this study, a combustion method as an efficient, easy, low-cost, and eco-friendly technique was used to synthesize nano-ZnO as a matrix with different yttrium doping ratios with different doping concentrations. Not only X-ray diffraction (XRD), but also scanning electron microscopy (SEM), and Fourier transformation Infrared spectroscopy (FT-IR) technique employed to characterize the structural and surface morphology of the Y2O3-ZnO nanocomposites. The obtained results supported ZnO's growth from crystalline to satisfactory nanoparticle structure by changing the yttrium doping concentrations inside ZnO nanoparticles. Moreover, UV-Vis diffuse reflectance spectroscopy, AC electrical conductivity, and current-voltage characteristics were considered to characterize the effects of yttrium doping on the energy bandgaps and electrical/dielectric properties and discussed the parameters of the ceramic varistors of the studied Y2O3-ZnO nano-complex oxides. The photocatalytic degradation efficiency of phenol, Methylene Blue, and Rhodamine B was investigated using all prepared Y2O3-ZnO nanostructured samples. As the yttrium doping ratios increased, the photocatalytic efficiency increased. After the addition of moderate Y3+ ions-doping, Further generation of hydroxyl radicals over ZnO. For Y2O3-ZnO (S5), the optimal photocatalyst is a degradation of 100 % of phenol, Methylene Blue, and Rhodamine B solutions compared to 80% of photocatalysis for ZnO stand alone. The prepared Y2O3-ZnO nanostructured materials are considered novel potential candidates in broad nano-applications ranging from biomedical and photocatalytic degradation for organic dyes and phenol to environmental and varistor applications.


2021 ◽  
Vol 118 (3) ◽  
pp. 033901
Author(s):  
Weihong Gao ◽  
Zihang Liu ◽  
Wenhao Zhang ◽  
Naoki Sato ◽  
Quansheng Guo ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document