Enhanced reactive oxygen species (ROS) yields and antibacterial activity of spongy ZnO/ZnFe2O4 hybrid micro-hexahedra selectively synthesized through a versatile glucose-engineered co-precipitation/annealing process

Guoxiu Tong; Fangfang Du; Wenhua Wu; Ruonan Wu; Fangting Liu; Yan Liang

doi:10.1039/C3TB20229A

Enhanced reactive oxygen species (ROS) yields and antibacterial activity of spongy ZnO/ZnFe₂O₄ hybrid micro-hexahedra selectively synthesized through a versatile glucose-engineered co-precipitation/annealing process

Guoxiu Tong,*^a Fangfang Du,^a Wenhua Wu,^a Ruonan Wu,^d Fangting Liu^a and Yan Liang*^bcd

* Corresponding authors

^a College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People's Republic of China
E-mail: tonggx@zjnu.cn
Fax: +86-579-82282269
Tel: +86-579-82282269

^b Department of Environmental Pollution and Process Control, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, P. O. Box 9825, Beijing 100029, P. R. China

^c Centre for Food Safety and Environmental Technology, Guangzhou Institute of Advanced Technology, Chinese Academy of Sciences, Guangzhou 511458, China

^d Croucher Institute for Environmental Sciences and the Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong, People's Republic of China
E-mail: yliang@hkbu.edu.hk

Abstract

In this study, sponge-like ZnO/ZnFe₂O₄ hybrid micro-hexahedra with diverse textures and compositions were fabricated by the thermal decomposition of hexahedral zinc/iron oxalate precursors, starting from a glucose-engineered co-precipitation process. The resulting ZnO/ZnFe₂O₄ micro-hexahedra were systematically characterized by X-ray powder diffraction, Fourier-transform infrared spectroscopy, scanning electronic microscopy, transmission electron microscopy (TEM), high-resolution TEM, and surface area analysis. Moreover, modulation in crystal size, composition, and textural properties of spongy ZnO/ZnFe₂O₄ micro-hexahedra was easily achieved by varying the Zn²⁺/Fe³⁺ feeding ratio and the annealing temperature. The antibacterial property of the products was analyzed by testing ATP (adenosine triphosphate) and inhibition zones. Results showed that oxidative stress was the governing mechanism for the antibacterial activity of ZnO/ZnFe₂O₄ hybrid materials. Moreover, we found that the higher reactive oxygen species yields and the resulting antibacterial activity were exhibited by the ZnO/ZnFe₂O₄ micro-hexahedra formed at lower sintering temperatures rather than the pure ZnO and Fe₂O₃. The enhanced antibacterial properties were likely caused by the spongy ZnO/ZnFe₂O₄ heterostructures, improving the probability of photoinduced charge separation and broadening the visible-light absorption.

Journal of Materials Chemistry B

Enhanced reactive oxygen species (ROS) yields and antibacterial activity of spongy ZnO/ZnFe₂O₄ hybrid micro-hexahedra selectively synthesized through a versatile glucose-engineered co-precipitation/annealing process

Abstract

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Enhanced reactive oxygen species (ROS) yields and antibacterial activity of spongy ZnO/ZnFe₂O₄ hybrid micro-hexahedra selectively synthesized through a versatile glucose-engineered co-precipitation/annealing process

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