Highly Sensitive and Selective HCHO Sensor Based on Co Doped ZnO Hollow Microspheres Activated by UV Light

Abstract In the present report, synthesis of pure, Nd-doped (1 wt.%) and Nd/Sm (1 wt.%) co-doped Zinc Oxide (ZnO) Nanoparticles (NPs) by using simple co-precipitation method. PXRD pattern of all the synthesized samples exposes the hexagonal crystal structure of ZnO NPs without any impurity. The various functional groups presented in the synthesized samples were analyzed by FT-IR studies. From UV-Vis DRS spectra, the band gap was found to be 2.81 eV, 2.90 and 3.10 eV respectively for pure, Nd-doped and Nd-Sm co-doped ZnO NPs. PL spectrum displays the broad emission at 393and 450 nm for all the synthesized samples. The agglomeration of flower-like morphology of pure ZnO NPs, flake-like structure of Nd-doped and rod-like morphology of Nd/Sm co-doped ZnO NPs were examined by SEM. Photocatalytic activity of the prepared samples for dye degradation of Acid Orange 7 (AO-7) and Acid Red 13 (AR-13) was studied under UV light. The result revealed that, the Nd/Sm co-doped ZnO NPs found to have efficient degradation candidate materials.

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Physical Properties and Photocatalytic Activity of Fe- and Co-Doped ZnO Nanoparticles Synthesized via Surfactant Modified Co-Precipitation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1123.241 ◽

2015 ◽

Vol 1123 ◽

pp. 241-246 ◽

Cited By ~ 1

Author(s):

Annisa Noorhidayati ◽

Siti Adriani ◽

Rosari Saleh

Keyword(s):

Photocatalytic Activity ◽

Diffuse Reflectance Spectroscopy ◽

Uv Light ◽

Sodium Dodecyl ◽

Precipitation Method ◽

Resonance Spectroscopy ◽

Dopant Atom ◽

Doped Zno ◽

Co Precipitation ◽

Co Doped

Fe- and Co-doped ZnO with various doping concentrations have been synthesized by co-precipitation method in the presence of sodium dodecyl sulfate as anionic surfactant. The obtained sample powders were characterized by X-ray diffraction, Fourier transform infrared absorption, UV-visible diffuse reflectance spectroscopy, electron spin resonance spectroscopy and Brunauer-Emmet-Teller (BET) method. The photocatalytic activity was evaluated by observing the decolorization of methylene blue under UV light irradiation. The results revealed that the addition of a dopant atom significantly enhanced the photocatalytic activity.

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Kinetics and Photodegradation Study of Congo Red using Mg with Ti/Al Co-Doped ZnO Nanocomposite under UV Light

Asian Journal of Chemistry ◽

10.14233/ajchem.2020.22383 ◽

2019 ◽

Vol 32 (2) ◽

pp. 369-373

Author(s):

S. Arul ◽

T. Senthilnathan

Keyword(s):

Congo Red ◽

Uv Light ◽

Order Reaction ◽

Uv Absorption ◽

First Order Reaction ◽

Mercury Lamp ◽

First Order ◽

Doped Zno ◽

Co Doped

ZnO nanocomposites co-doped with dopants like Mg with Ti or Al were prepared and assigned as ZnO-A and ZnO-B. All the nanocomposites were characterized by XRD, SEM and EDX and its utility towards the photodegradation of Congo red is studied. The present study was carried out in 30 W mercury lamp fitted in batch photoreactor and the effect of decomposition was measured in UV-absorption. Nanocomposite with combination of Ti dopant (ZnO-A) exhibited effective degrading ability to aqueous Congo red solution. A solution of 100 ppm of above concentrated ZnO nanocomposite solution was reduced nearly to 5ppm within 5 h. The photodegradation kinetics revealed that the photodegradation of aqueous Congo red follows first order reaction and showed quite comparable degradation effeciency with earlier reports.

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Facile Fabrication of Mesoporous Hierarchical Co-Doped ZnO for Highly Sensitive Ethanol Detection

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.9b00158 ◽

2019 ◽

Vol 58 (19) ◽

pp. 8061-8071 ◽

Cited By ~ 11

Author(s):

Yufan Mo ◽

Feng Shi ◽

Shuaiwei Qin ◽

Pinggui Tang ◽

Yongjun Feng ◽

...

Keyword(s):

Highly Sensitive ◽

Facile Fabrication ◽

Doped Zno ◽

Co Doped

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Influence of N Dopant on the Electric and Magnetic Properties of Co Doped ZnO Thin Films

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2010.00711 ◽

2010 ◽

Vol 25 (7) ◽

pp. 711-716 ◽

Cited By ~ 3

Author(s):

Xue-Tao WANG ◽

Li-Ping ZHU ◽

Zhi-Gao YE ◽

Zhi-Zhen YE ◽

Bing-Hui ZHAO

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Zno Thin Films ◽

Doped Zno ◽

Co Doped

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Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

Current Nanoscience ◽

10.2174/1573413715666191010162626 ◽

2020 ◽

Vol 16 (4) ◽

pp. 655-666

Author(s):

Mona Rekaby

Keyword(s):

Magnetic Properties ◽

Zno Nanoparticles ◽

Room Temperature ◽

Magnetic Measurements ◽

Structural Defects ◽

Ferromagnetic Behavior ◽

Secondary Phases ◽

Antiferromagnetic Ordering ◽

Doped Zno ◽

Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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