Synthesis of Mg-doped ZnO NPs via a chemical low-temperature method and investigation of the efficient photocatalytic activity for the degradation of dyes under solar light

Ce-doped ZnO (ZnO:Ce) nanorods have been prepared through a solvothermal method and the effects of Ce-doping on the structural, optical and electronic properties of ZnO rods were studied. ZnO:Ce rods were characterized by XRD, SEM, TEM, XPS, BET, DRS and Raman spectroscopy. 5% Ce-doped ZnO rods with an average length of 130 nm and a diameter of 23 nm exhibit the highest photocatalytic activity for the degradation of the Orange II dye under solar light irradiation. The high photocatalytic activity is ascribed to the substantially enhanced light absorption in the visible region, to the high surface area of ZnO:Ce rods and to the effective electron–hole pair separation originating from Ce doping. The influence of various experimental parameters like the pH, the presence of salts and of organic compounds was investigated and no marked detrimental effect on the photocatalytic activity was observed. Finally, recyclability experiments demonstrate that ZnO:Ce rods are a stable solar-light photocatalyst.

Download Full-text

Low temperature method to passivate oxygen vacancies in un-doped ZnO films using atomic layer deposition

Thin Solid Films ◽

10.1016/j.tsf.2018.03.003 ◽

2018 ◽

Vol 660 ◽

pp. 852-858 ◽

Cited By ~ 8

Author(s):

Yue Wang ◽

Kyung-Mun Kang ◽

Minjae Kim ◽

Hyung-Ho Park

Keyword(s):

Low Temperature ◽

Atomic Layer Deposition ◽

Oxygen Vacancies ◽

Atomic Layer ◽

Zno Films ◽

Temperature Method ◽

Layer Deposition ◽

Doped Zno

Download Full-text

High Performance Top-Emission Quantum Dot Light-Emitting Diodes with Mg-Doped ZnO Nanoparticles Used as an Electron Transport Layer

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19230 ◽

2021 ◽

Vol 21 (7) ◽

pp. 3747-3752

Author(s):

Bada Kim ◽

Dohyeong Lee ◽

Boram Hwang ◽

Yebin Eun ◽

Mi-Young Ha ◽

...

Keyword(s):

Electron Transport ◽

Quantum Dot ◽

Transport Layer ◽

Electron Transport Layer ◽

Maximum Luminance ◽

Zno Nps ◽

Light Emitting ◽

Mg Doping ◽

Doped Zno ◽

Mg Doped

In this paper, we reported superior performance of solution-processed top-emission quantum dot light-emitting diodes (TE-QLEDs) with Mg-doped ZnO nanoparticle (NP) electron transport layer (ETL). The Mg-doped ZnO NPs were synthesized by the sol-gel method. Transmission electron microscopy (TEM) analysis of the Mg-doped ZnO NPs with 0 wt%, 5 wt%, 10 wt%, and 15 wt% Mg-doping concentrations revealed average diameters of 5.86 nm, 5.33 nm, 4.52 nm, and 4.37 nm, respectively. The maximum luminance, the current efficiency, and external quantum efficiency (EQE) were 178,561.8 cd/m2, 56.0 cd/A, and 14.43%, respectively. However, for the best performance of TE-QLED without Mg-doping in the ZnO NPs, the maximum luminance was only 101,523.4 cd/m2, the luminous efficiency was 27.8 cd/A, and the EQE was 6.91%. The improvement of the performance is attributed to the suppression of electron transfer by an increase in the energy barrier between the cathode and Mg-doped ZnO NP ETL and the reduction in the Hall mobility of electron with increasing the Mg-doping in the ZnO NPs, resulting in the enhanced charge balance in the quantum dot (QD) emitting layer (EML).

Download Full-text

WO3 Quantum Dots Decorated GO/Mg-doped ZnO Composites for Enhanced Photocatalytic Activity under Nature Sunlight

Applied Organometallic Chemistry ◽

10.1002/aoc.4449 ◽

2018 ◽

Vol 32 (9) ◽

pp. e4449 ◽

Cited By ~ 7

Author(s):

Huiyang Zhao ◽

Qun Fang ◽

Chuansheng Chen ◽

Zisheng Chao ◽

Yuenhong Tsang ◽

...

Keyword(s):

Quantum Dots ◽

Photocatalytic Activity ◽

Doped Zno ◽

Mg Doped

Download Full-text

Structure, luminescence and photocatalytic activity of Mg-doped ZnO nanoparticles prepared by auto combustion method

Materials Science in Semiconductor Processing ◽

10.1016/j.mssp.2014.07.034 ◽

2015 ◽

Vol 29 ◽

pp. 372-379 ◽

Cited By ~ 63

Author(s):

Yajun Wang ◽

Xiaoru Zhao ◽

Libing Duan ◽

Fenggui Wang ◽

Hongru Niu ◽

...

Keyword(s):

Photocatalytic Activity ◽

Zno Nanoparticles ◽

Combustion Method ◽

Auto Combustion ◽

Doped Zno ◽

Mg Doped

Download Full-text

Enhanced Photocatalytic Activity of ZnO–CdS Composite Nanostructures towards the Degradation of Rhodamine B under Solar Light

Catalysts ◽

10.3390/catal12010084 ◽

2022 ◽

Vol 12 (1) ◽

pp. 84

Author(s):

Thirumala Rao Gurugubelli ◽

R. V. S. S. N. Ravikumar ◽

Ravindranadh Koutavarapu

Keyword(s):

Photocatalytic Activity ◽

Rhodamine B ◽

Photogenerated Electron ◽

Hexagonal Wurtzite Structure ◽

Chemical Precipitation ◽

Solar Light ◽

Near Band Edge ◽

Band Edge Emission ◽

Zno Nps ◽

Composite Nanostructures

A simple chemical precipitation route was utilized for the synthesis of ZnO nanoparticles (NPs), CdS NPs and ZnO–CdS nanocomposites (NCs). The synthesized nanostructures were examined for the crystal structure, morphology, optical properties and photodegradation activity of rhodamine B (RhB) dye. The ZnO–CdS NCs showed a mixed phase of hexagonal wurtzite structure for both ZnO NPs and CdS NPs. Pure ZnO NPs and CdS NPs possessed bandgaps of 3.2617 and 2.5261 eV, respectively. On the other hand, the composite nanostructures displayed a more narrow bandgap of 2.9796 eV than pure ZnO NPs. When compared to bare ZnO NPs, the PL intensity of near-band-edge emission at 381 nm was practically suppressed, suggesting a lower rate of photogenerated electron–hole (e−/h+) pairs recombination, resulting in enhanced photocatalytic activity. Under solar light, the composite nanostructures displayed a photodegradation efficiency of 98.16% towards of RhB dye. After four trials, the structural stability of ZnO–CdS NCs was verified.

Download Full-text

Enhanced sunlight-driven photocatalytic property of Mg-doped ZnO nanocomposites with three-dimensional graphene oxide/MoS2 nanosheet composites

RSC Advances ◽

10.1039/c8ra02382d ◽

2018 ◽

Vol 8 (31) ◽

pp. 17399-17409 ◽

Cited By ~ 9

Author(s):

Chuansheng Chen ◽

Wei Mei ◽

Weiwei Yu ◽

Xi'an Chen ◽

Longhui Zeng ◽

...

Keyword(s):

Photocatalytic Activity ◽

Graphene Oxide ◽

Three Dimensional ◽

Photocatalytic Property ◽

Focus Of Attention ◽

Large Specific Surface Area ◽

Optical And Electronic Properties ◽

Mos2 Nanosheet ◽

Doped Zno ◽

Mg Doped

Graphene oxide (GO) has been the focus of attention as it can enhance the photocatalytic activity of semiconductors due to its large specific surface area and remarkable optical and electronic properties.

Download Full-text