Blue and violet defect levels mediated absorption hot spots in tapered ZnO nanorods toward improved photocatalytic activity

Bose, Sukanta; Dey, Debasish; Banerjee, Subhabrata; Ahmad, Gufran; Mandal, Sourav; Mukherjee, Nillohit

doi:10.1007/s10853-017-1393-y

Cited by 2 publications

(2 citation statements)

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“… 40 It has been understood that this small morphological difference plays an important role in photocatalytic performance by triggering the formation of lower energy band levels by defect formation in the ZnO structure and thus capturing photogenerated electrons and holes. 40 O v and Zn i play a significant role in the photocatalytic activity of ZnO. 41 , 42 Recently, P. Nandi and D. Das reported that the defect states in ZnO lower the fast recombination of electrons and holes, increase charge transport and accelerate the photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Bose et al used the electrochemical technique to deposit hexagonal and tapered ZnO nanorods on the glass substrate . It has been understood that this small morphological difference plays an important role in photocatalytic performance by triggering the formation of lower energy band levels by defect formation in the ZnO structure and thus capturing photogenerated electrons and holes . O v and Zn i play a significant role in the photocatalytic activity of ZnO. , Recently, P. Nandi and D. Das reported that the defect states in ZnO lower the fast recombination of electrons and holes, increase charge transport and accelerate the photocatalytic activity .…”

Section: Introductionmentioning

confidence: 99%

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Impact on the Photocatalytic Dye Degradation of Morphology and Annealing-Induced Defects in Zinc Oxide Nanostructures

et al. 2023

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In this study, three different morphologies, nanoflower (NF), nano sponge (NS), and nano urchin (NU), of zinc oxide (ZnO) nanostructures were synthesized successfully via a mild hydrothermal method. After synthesis, the samples were annealed in the atmosphere at 300, 600, and 800 °C. Although annealing provides different degradation kinetics for different morphologies, ZnO NS performed significantly better than other morphologies for all annealing temperatures we used in the study. When the photoluminescence, electron paramagnetic resonance spectroscopy, BET surface, and X-ray diffraction analysis results are examined, it is revealed that the defect structure, pore diameter, and crystallinity cumulatively affect the photocatalytic activity of ZnO nanocatalysts. As a result, to obtain high photocatalytic activity in rhodamine B (RhB) degradation, it is necessary to develop a ZnO catalyst with fewer core defects, more oxygen vacancies, near band emission, large crystallite size, and large pore diameter. The ZnO NS-800 °C nanocatalyst studied here had a 35.6 × 10–3 min–1 rate constant and excellent stability after a 5-cycle photocatalytic degradation of RhB.

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