Effect of plasma treatment on native defects and photocatalytic activities of zinc oxide tetrapods

Fangzhou Liu; Yu Hang Leung; Aleksandra B. Djurišić; Alan Man Ching Ng; Wai Kin Chan; Ka Long Ng; Kam Sing Wong; Changzhong Liao; Kaimin Shih; Charles Surya

doi:10.1021/jp506468r

Effect of plasma treatment on native defects and photocatalytic activities of zinc oxide tetrapods

Fangzhou Liu, Yu Hang Leung, Aleksandra B. Djurišić, Alan Man Ching Ng, Wai Kin Chan, Ka Long Ng, Kam Sing Wong, Changzhong Liao, Kaimin Shih, Charles Surya

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

ZnO tetrapods, as a ZnO nanostructure with a low defect concentration, were subjected to plasma treatments using different gases to induce different types of defects in the samples and examine their effects on sample properties. Hydrogen and argon plasmas resulted in significant oxygen deficiencies, but no defect emission appeared. Oxygen plasma had only a minor effect on the sample composition, but it resulted in the appearance of defect emission and a significant overall reduction in luminescence intensity. On the other hand, the photocatalytic activity was significantly reduced in samples exhibiting oxygen deficiencies. It can thus be concluded that oxygen vacancies do not participate in the green emission of ZnO and also that their presence at the sample surface does not enhance the photocatalytic activity.

Original language	English
Pages (from-to)	22760-22767
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	39
DOIs	https://doi.org/10.1021/jp506468r
Publication status	Published - Jan 1 2014
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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Effect of plasma treatment on native defects and photocatalytic activities of zinc oxide tetrapods. / Liu, Fangzhou; Leung, Yu Hang; Djurišić, Aleksandra B.; Ng, Alan Man Ching; Chan, Wai Kin; Ng, Ka Long; Wong, Kam Sing; Liao, Changzhong; Shih, Kaimin; Surya, Charles.

In: Journal of Physical Chemistry C, Vol. 118, No. 39, 01.01.2014, p. 22760-22767.

Research output: Contribution to journal › Article › peer-review

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abstract = "ZnO tetrapods, as a ZnO nanostructure with a low defect concentration, were subjected to plasma treatments using different gases to induce different types of defects in the samples and examine their effects on sample properties. Hydrogen and argon plasmas resulted in significant oxygen deficiencies, but no defect emission appeared. Oxygen plasma had only a minor effect on the sample composition, but it resulted in the appearance of defect emission and a significant overall reduction in luminescence intensity. On the other hand, the photocatalytic activity was significantly reduced in samples exhibiting oxygen deficiencies. It can thus be concluded that oxygen vacancies do not participate in the green emission of ZnO and also that their presence at the sample surface does not enhance the photocatalytic activity.",

author = "Fangzhou Liu and Leung, {Yu Hang} and Djuri{\v s}i{\'c}, {Aleksandra B.} and Ng, {Alan Man Ching} and Chan, {Wai Kin} and Ng, {Ka Long} and Wong, {Kam Sing} and Changzhong Liao and Kaimin Shih and Charles Surya",

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AU - Liu, Fangzhou

AU - Leung, Yu Hang

AU - Djurišić, Aleksandra B.

AU - Ng, Alan Man Ching

AU - Chan, Wai Kin

AU - Ng, Ka Long

AU - Wong, Kam Sing

AU - Liao, Changzhong

AU - Shih, Kaimin

AU - Surya, Charles

PY - 2014/1/1

Y1 - 2014/1/1

N2 - ZnO tetrapods, as a ZnO nanostructure with a low defect concentration, were subjected to plasma treatments using different gases to induce different types of defects in the samples and examine their effects on sample properties. Hydrogen and argon plasmas resulted in significant oxygen deficiencies, but no defect emission appeared. Oxygen plasma had only a minor effect on the sample composition, but it resulted in the appearance of defect emission and a significant overall reduction in luminescence intensity. On the other hand, the photocatalytic activity was significantly reduced in samples exhibiting oxygen deficiencies. It can thus be concluded that oxygen vacancies do not participate in the green emission of ZnO and also that their presence at the sample surface does not enhance the photocatalytic activity.

AB - ZnO tetrapods, as a ZnO nanostructure with a low defect concentration, were subjected to plasma treatments using different gases to induce different types of defects in the samples and examine their effects on sample properties. Hydrogen and argon plasmas resulted in significant oxygen deficiencies, but no defect emission appeared. Oxygen plasma had only a minor effect on the sample composition, but it resulted in the appearance of defect emission and a significant overall reduction in luminescence intensity. On the other hand, the photocatalytic activity was significantly reduced in samples exhibiting oxygen deficiencies. It can thus be concluded that oxygen vacancies do not participate in the green emission of ZnO and also that their presence at the sample surface does not enhance the photocatalytic activity.

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Effect of plasma treatment on native defects and photocatalytic activities of zinc oxide tetrapods

Abstract

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