Influence of defects on the photocatalytic activity of Niobium-doped ZnO nanoparticles

Satheesan, M. K.; Baiju, K. V.; Kumar, V.

doi:10.1007/s10854-016-6114-9

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…In general, surface defects are beneficial to the photocatalytic activity, whereas bulk defects have only negative effects [34–36] . This substantiates the significance in understanding how to tune the concentration, type and location of these defects.…”

Section: Self‐doping Approachsupporting

confidence: 56%

“…In general, surface defects are beneficial to the photocatalytic activity, whereas bulk defects have only negative effects. [34][35][36] This substantiates the significance in understanding how to tune the concentration, type and location of these defects. Since the bulk defects negatively influence the photocatalytic activity of ZnO, its elimination is rather necessary.…”

Section: Effect Of the Defects Locationsupporting

confidence: 53%

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Strategies to Enhance ZnO Photocatalyst's Performance for Water Treatment: A Comprehensive Review

Hezam

Drmosh

Ponnamma

et al. 2022

The Chemical Record

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Despite the photocatalytic organic pollutant degradation using ZnO started in 1910–1911, many challenges are still ahead, and several critical issues have to be addressed. Large band gap, and short life‐time of photogenerated electrons and holes are critical issues negatively affect the photocatalytic activity of ZnO. Various approaches have been introduced to overcome these issues including intrinsic doping, extrinsic doping, and heterostructure. This review introduces unique and deep insights into tuning of the photocatalytic activity of ZnO. It starts by description of how to tune the photocatalytic activity of pristine ZnO through tuning its morphology, surface area, exposed face, and intrinsic defects. Afterward, the review explains how the Z‐scheme approach succeed to address the redox weakened issue of heterojunction approach. In general, this review provides a clear image that helps the researcher to tune the photocatalytic activity of pristine ZnO and its heterostructure.

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Section: Self‐doping Approachsupporting

confidence: 56%

Section: Effect Of the Defects Locationsupporting

confidence: 53%

Strategies to Enhance ZnO Photocatalyst's Performance for Water Treatment: A Comprehensive Review

Hezam

Drmosh

Ponnamma

et al. 2022

The Chemical Record

View full text Add to dashboard Cite

show abstract

“…Doping of ZnO NPs with transition metal ions affects the optical and photocatalytic activity properties by shifting the optical absorption toward the visible region . Hence, recently, the focus of many researchers has turned to doping of ZnO NPs with transition metals such as Mn, Cr, Fe, Ti, V, Co, Ni, Cu, Y, Zr, Nb, Pd, Ag and Cd . Copper (Cu) is considered as one of the most effective means of doping because of its physical and chemical properties are similar to those of zinc (Zn), its inexpensiveness and natural abundance can improve absorption, emission and photocatalytic activity of ZnO NPs .…”

Section: Introductionmentioning

confidence: 99%

Rapid, controllable, one‐pot and room‐temperature aqueous synthesis of ZnO:Cu nanoparticles by pulsed UV laser and its application for photocatalytic degradation of methyl orange

et al. 2017

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Zinc oxide (ZnO) and ZnO:Cu nanoparticles (NPs) were synthesized using a rapid, controllable, one-pot and room-temperature pulsed UV-laser assisted method. UV-laser irradiation was used as an effective energy source in order to gain better control over the NPs size and morphology in aqueous media. Parameters effective in laser assisted synthesis of NPs such as irradiation time and laser shot repetition rate were optimized. Photoluminescence (PL) spectra of ZnO NPs showed a broad emission with two trap state peaks located at 442 and 485 nm related to electronic transition from zinc interstitial level (I ) to zinc vacancy level (V ) and electronic transition from conduction band to the oxygen vacancy level (V ), respectively. For ZnO:Cu NPs, trap state emissions disappeared completely and a copper (Cu)-related emission appeared. PL intensity of Cu-related emission increased with the increase in concentration of Cu , so that for molar ratio of Cu:Zn 2%, optimal value of PL intensity was obtained. The photocatalytic activity of Cu-doped ZnO revealed 50 and 100% increasement than that of undoped NPs under UV and visible irradiation, respectively. The enhanced photocatalytic activity could be attributed to smaller crystal size, as well as creation of impurity acceptor levels (T ) inside the ZnO energy band gap.

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Donor Defect Induced Ferromagnetism in Nb‐Doped ZnO Thin Films Grown by RF Magnetron Sputtering

Sukumaran,

Gopalakrishnan

2024

Physica Status Solidi (a)

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The effect of Nb doping concentration (0, 1, 2, and 4 at. %) on donor defect‐induced ferromagnetism in ZnO thin films is investigated. The films are deposited on Si(111) substrates utilizing the radio frequency magnetron sputtering. X‐ray diffraction pattern unveils that the films show a pronounced orientation along the (002) direction. The relative intensities of defect‐related bands with that of the ultraviolet band from photoluminescence (PL) spectra show that 2 at. % Nb doping results in a greater number of donor defects (Zni+ and VO+) in the ZnO lattice. The parameters extracted from the electron paramagnetic resonance spectra follow a similar trend. The results from vibrating sample magnetometer measurement indicate that pure ZnO displays diamagnetic nature, whereas Nb‐doped ZnO exhibits a ferromagnetic nature. The saturation magnetization value is found highest for 2 at. % Nb doping, which correlates with the presence of a greater number of donor defects, as supported by the PL and electron paramagnetic resonance results. Images obtained from atomic force microscopy show that the surface roughness of the ZnO thin film reduces upon Nb doping. X‐ray photoelectron spectroscopy validates that Nb is doped in 2 at. % Nb‐doped ZnO thin film with Nb oxidation state of +5.

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Influence of defects on the photocatalytic activity of Niobium-doped ZnO nanoparticles

Cited by 11 publications

References 34 publications

Strategies to Enhance ZnO Photocatalyst's Performance for Water Treatment: A Comprehensive Review

Strategies to Enhance ZnO Photocatalyst's Performance for Water Treatment: A Comprehensive Review

Rapid, controllable, one‐pot and room‐temperature aqueous synthesis of ZnO:Cu nanoparticles by pulsed UV laser and its application for photocatalytic degradation of methyl orange

Donor Defect Induced Ferromagnetism in Nb‐Doped ZnO Thin Films Grown by RF Magnetron Sputtering

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