期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 22, 期 24, 页码 8053-8058出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201601018
关键词
3D printing; antibacterial activity; atomic layer deposition; atomic level studies; zinc oxide
资金
- National Natural Science Foundation of China [21103159, 21461015, 81270202, 91339113, 61404009, 61204065, U1303191, 51202240, 61307045, 81503364, 31560264, 21371165]
- Science Foundation of Jiangxi Provincial Department of Education [KJLD14010, 20153BCB23035]
- National Key Basic Research Program of China [2013CB531103]
For the first time, the influence of different types of atoms (Zn and O) on the antibacterial activities of nanosized ZnO was quantitatively evaluated with the aid of a 3D-printing-manufactured evaluation system. Two different outermost atomic layers were manufactured separately by using an ALD (atomic layer deposition) method. Interestingly, we found that each outermost atomic layer exhibited certain differences against gram-positive or gram-negative bacterial species. Zinc atoms as outermost layer (ZnO-Zn) showed a more pronounced antibacterial effect towards gram-negative E. coli (Escherichia coli), whereas oxygen atoms (ZnO-O) showed a stronger antibacterial activity against gram-positive S. aureus (Staphylococcus aureus). A possible antibacterial mechanism has been comprehensively discussed from different perspectives, including Zn2+ concentrations, oxygen vacancies, photocatalytic activities and the DNA structural characteristics of different bacterial species.
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