期刊
COATINGS
卷 8, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/coatings8100341
关键词
bamboo; TiO2; ZnO; layered double nanostructures; antifungal property; flame-retardant property
资金
- Fundamental Research Funds for the Central Non-profit Research Institution of CAF [CAFYBB2017MA023]
- National Key Research and Development Program of China [2016YFD0600904]
- Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province [2014F10047]
A facile method to synthesize ZnO-TiO2-layered double-nanostructures with the average thickness of 20 m on a bamboo substrate was proposed to improve the antifungal and flame-retardant properties. The cross-linked wurtzite ZnO nanostructures with an average thickness of approximately 0.14 m were uniformly distributed on the anatase TiO2 surface. The energy-dispersive X-ray spectroscopy (EDS) confirmed that the ZnO-TiO2 coating on bamboo was a layered double nanostructure. During a two-month antifungal test conducted in an outdoor environment, the fungi began to grow after one week on pristine bamboo and three weeks on ZnO-bamboo and TiO2-bamboo. Furthermore, there was an infected area of 100% after four weeks for pristine bamboo and six weeks for ZnO-bamboo, while there was an infected area of 43% after eight weeks for TiO2-bamboo. By comparison, there was no visible fungal growth on ZnO-TiO2-bamboo until the end of the test. The electron spin resonance (ESR) technique has demonstrated that the reactive oxygen species (ROS) of center dot O-2(-) and center dot OH were produced from the ZnO-TiO2 surface under visible light irradiation (lambda > 420 nm). This large quantity of center dot O-2(-) compared to center dot OH is considered to be mainly responsible for the inactivation of fungi. Additionally, the limiting oxygen index has increased from 25.6% to 30.2% after being covered with a ZnO-TiO2 coating, which revealed a significant enhancement of its flame-retardant property.
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