Tailoring the sensing properties of microwave-assisted grown ZnO nanorods: Effect of irradiation time on luminescence and magnetic behaviour

K. Shingange; G. H. Mhlongo; D. E. Motaung; O. M. Ntwaeaborwa

doi:10.1016/j.jallcom.2015.10.069

Tailoring the sensing properties of microwave-assisted grown ZnO nanorods: Effect of irradiation time on luminescence and magnetic behaviour

K. Shingange, G. H. Mhlongo, D. E. Motaung, O. M. Ntwaeaborwa

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

42 Citations (Scopus)

Abstract

This paper reports on highly crystalline ZnO nanorods with different lengths and widths, grown using a microwave-assisted hydrothermal method at different irradiation times. The BET (Brunauer, Emmet, Teller) surface area increased while the lengths and widths of the ZnO nanorods were reduced with increasing irradiation time. The combination of photoluminescence (PL) and electron paramagnetic resonance (EPR) analyses elucidated that the defect-related properties affect the sensing response of the ZnO nanostructures. A broad visible emission band related to Zn_i and V_O surface defects on the surfaces of ZnO nanorods was observed. The EPR studies revealed the ferromagnetic signal with a g-value of >2.0 for all ZnO nanostructures induced by Zn_i and V_O surface defects. Gas sensors based on these ZnO nanorods exhibited a high sensing response to CO at 350 °C. Thus, our findings showed that the high response originates from surface defects (Zn_i and V_O) formed at the surfaces of ZnO nanorods.

Original language	English
Pages (from-to)	917-926
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	657
DOIs	https://doi.org/10.1016/j.jallcom.2015.10.069
Publication status	Published - 5 Feb 2016
Externally published	Yes

Keywords

Defects
Ferromagnetic
Gas sensing
Nanostructures
ZnO

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2015.10.069

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title = "Tailoring the sensing properties of microwave-assisted grown ZnO nanorods: Effect of irradiation time on luminescence and magnetic behaviour",

abstract = "This paper reports on highly crystalline ZnO nanorods with different lengths and widths, grown using a microwave-assisted hydrothermal method at different irradiation times. The BET (Brunauer, Emmet, Teller) surface area increased while the lengths and widths of the ZnO nanorods were reduced with increasing irradiation time. The combination of photoluminescence (PL) and electron paramagnetic resonance (EPR) analyses elucidated that the defect-related properties affect the sensing response of the ZnO nanostructures. A broad visible emission band related to Zni and VO surface defects on the surfaces of ZnO nanorods was observed. The EPR studies revealed the ferromagnetic signal with a g-value of >2.0 for all ZnO nanostructures induced by Zni and VO surface defects. Gas sensors based on these ZnO nanorods exhibited a high sensing response to CO at 350 °C. Thus, our findings showed that the high response originates from surface defects (Zni and VO) formed at the surfaces of ZnO nanorods.",

keywords = "Defects, Ferromagnetic, Gas sensing, Nanostructures, ZnO",

author = "K. Shingange and Mhlongo, {G. H.} and Motaung, {D. E.} and Ntwaeaborwa, {O. M.}",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

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T1 - Tailoring the sensing properties of microwave-assisted grown ZnO nanorods

T2 - Effect of irradiation time on luminescence and magnetic behaviour

AU - Shingange, K.

AU - Mhlongo, G. H.

AU - Motaung, D. E.

AU - Ntwaeaborwa, O. M.

PY - 2016/2/5

Y1 - 2016/2/5

N2 - This paper reports on highly crystalline ZnO nanorods with different lengths and widths, grown using a microwave-assisted hydrothermal method at different irradiation times. The BET (Brunauer, Emmet, Teller) surface area increased while the lengths and widths of the ZnO nanorods were reduced with increasing irradiation time. The combination of photoluminescence (PL) and electron paramagnetic resonance (EPR) analyses elucidated that the defect-related properties affect the sensing response of the ZnO nanostructures. A broad visible emission band related to Zni and VO surface defects on the surfaces of ZnO nanorods was observed. The EPR studies revealed the ferromagnetic signal with a g-value of >2.0 for all ZnO nanostructures induced by Zni and VO surface defects. Gas sensors based on these ZnO nanorods exhibited a high sensing response to CO at 350 °C. Thus, our findings showed that the high response originates from surface defects (Zni and VO) formed at the surfaces of ZnO nanorods.

AB - This paper reports on highly crystalline ZnO nanorods with different lengths and widths, grown using a microwave-assisted hydrothermal method at different irradiation times. The BET (Brunauer, Emmet, Teller) surface area increased while the lengths and widths of the ZnO nanorods were reduced with increasing irradiation time. The combination of photoluminescence (PL) and electron paramagnetic resonance (EPR) analyses elucidated that the defect-related properties affect the sensing response of the ZnO nanostructures. A broad visible emission band related to Zni and VO surface defects on the surfaces of ZnO nanorods was observed. The EPR studies revealed the ferromagnetic signal with a g-value of >2.0 for all ZnO nanostructures induced by Zni and VO surface defects. Gas sensors based on these ZnO nanorods exhibited a high sensing response to CO at 350 °C. Thus, our findings showed that the high response originates from surface defects (Zni and VO) formed at the surfaces of ZnO nanorods.

KW - Defects

KW - Ferromagnetic

KW - Gas sensing

KW - Nanostructures

KW - ZnO

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VL - 657

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JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Tailoring the sensing properties of microwave-assisted grown ZnO nanorods: Effect of irradiation time on luminescence and magnetic behaviour

Abstract

Keywords

ASJC Scopus subject areas

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