Influence of annealing ambient on the structure, photoluminescence and photocatalytic activity of low temperature grown ZnO nanowires

Niu, Hongru; Zhao, Xiaoru; Duan, Libing; Wang, Yajun; Wang, Fenggui; Ali, Anwar; Liu, Ruidi

doi:10.1016/j.spmi.2015.01.009

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…With the currently developed zinc oxide nanomaterial as photocatalyst, it only took 20 min and 40 min to degrade 50% and 80% of original MO under UV irradiation, respectively, and the MO dye was totally degraded within 80 min. However, under almost the same photocatalytic condition as that in our experiments, the ZnO nanowires synthesized by Niu et al only degraded less than 20% of the original MO within 20 minutes and the degradation ratio of MO was no more than 40% after UV irradiation for 80 minutes [26]. In addition, for the ZnO film prepared by Yin et al, the degradation ratios of MO were only 40% and 58% after photocatalytic reaction under UV irradiation for 20 min and 40 min, respectively [27].…”

Section: Resultssupporting

confidence: 65%

Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange

Liu

Zhang

Yang

et al. 2016

Journal of Chemistry

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Nanometer-sized zinc oxide (ZnO) has been synthesized through sol-gel method with natural cellulose substance (commercial filter paper) as template. The structure of zinc oxide nanomaterial was characterized by nitrogen adsorption-desorption and XRD. The morphology was observed by SEM and TEM. The results show that the hexagonal wurtzite phase is actually the only crystal phase in the sample and the product faithfully inherits the hierarchical morphology and the complex network structure of the original filter paper, which is composed of many randomly intersecting zinc oxide microfibers and nanosheets with lots of close stacked particles adsorbed on the surface. Moreover, these zinc oxide nanomaterials possess abundant mesoporous structure with an average pore diameter ofca. 21 nm and a wide pore size distribution (3–30 nm). Due to the strong absorption ability in the UV range, the zinc oxide nanomaterial prepared by this method displays significantly high photocatalytic activity for degrading methyl orange. In a short period of 20 minutes, the zinc oxide nanomaterial has degraded about 50% of the original MO, and the MO dye is fully degraded after UV irradiation for 80 minutes.

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Section: Resultssupporting

confidence: 65%

Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange

Liu

Zhang

Yang

et al. 2016

Journal of Chemistry

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“…Thus, upon 400 °C annealing, ZnO NRAs have a highly crystalline structure, with the effective quenching of Zn(OH) 2 . 44 Both recombination at the trapping site and improved crystallinity of ZnO are critical factors in the efficient PEC reaction. 45,46 These PL results effectively explain why the photocurrent density is enhanced drastically upon 400 °C vacuum annealing in Figure 2.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 99%

Simple but Effective Way To Enhance Photoelectrochemical Solar-Water-Splitting Performance of ZnO Nanorod Arrays: Charge-Trapping Zn(OH)₂ Annihilation and Oxygen Vacancy Generation by Vacuum Annealing

Baek

Kim

Yong

2017

ACS Appl. Mater. Interfaces

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This study presents an effective and the simplest method to substantially improve the photoelectrochemical water-splitting ability of hydrothermally grown ZnO nanorod arrays (NRAs). In the hydrothermal growth of ZnO NRAs, unwanted Zn(OH) species are formed, which act as trapping sites of photoexcited charges. We found that those inherent charge-trapping sites could be annihilated by the desorption of the hydroxyl groups upon vacuum annealing above 200 °C, which resulted in an enhancement of the charge-separation efficiency and photocurrent density. Another drastic increase in the photocurrent density occurred when ZnO NRAs were treated with annealing at higher temperature (700 °C), which can be attributed to the introduced oxygen vacancies acting as shallow donors in the ZnO crystal lattice. The removal of the charge-trapping Zn(OH) and the generation of oxygen vacancies were confirmed by photoluminescence (PL) and XPS analyses. The ZnO NRAs treated by this simple method yield a photocurrent density of 600 μA/cm at 1.23 V under 1 sun illumination, which is 20 times higher than that obtained from as-grown ZnO NRAs. This study presents a highly efficient way of increasing the bulk electric conductivity and photoelectrochemical activity of metal oxide nanorods without requiring the introduction of any extrinsic dopants.

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A comparative investigation of photocatalyst ZnO nanorods grown on different seed layers: influence of annealing temperature and atmosphere

Kardeş,

Öztürk

2023

Res Chem Intermed

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Influence of annealing ambient on the structure, photoluminescence and photocatalytic activity of low temperature grown ZnO nanowires

Cited by 9 publications

References 19 publications

Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange

Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange

Simple but Effective Way To Enhance Photoelectrochemical Solar-Water-Splitting Performance of ZnO Nanorod Arrays: Charge-Trapping Zn(OH)₂ Annihilation and Oxygen Vacancy Generation by Vacuum Annealing

A comparative investigation of photocatalyst ZnO nanorods grown on different seed layers: influence of annealing temperature and atmosphere

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Influence of annealing ambient on the structure, photoluminescence and photocatalytic activity of low temperature grown ZnO nanowires

Cited by 9 publications

References 19 publications

Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange

Filter Paper Inspired Zinc Oxide Nanomaterials with High Photocatalytic Activity for Degradation of Methylene Orange

Simple but Effective Way To Enhance Photoelectrochemical Solar-Water-Splitting Performance of ZnO Nanorod Arrays: Charge-Trapping Zn(OH)2 Annihilation and Oxygen Vacancy Generation by Vacuum Annealing

A comparative investigation of photocatalyst ZnO nanorods grown on different seed layers: influence of annealing temperature and atmosphere

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Simple but Effective Way To Enhance Photoelectrochemical Solar-Water-Splitting Performance of ZnO Nanorod Arrays: Charge-Trapping Zn(OH)₂ Annihilation and Oxygen Vacancy Generation by Vacuum Annealing