期刊
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
卷 18, 期 2, 页码 332-344出版社
WILEY
DOI: 10.1111/ijac.13674
关键词
absorption; bandgap; doping; Hydroxyapatite; structure; sunscreen filter
资金
- Science and Engineering Research Board (SERB), Department of Science and Technology, India [ECR/2015/000339]
The study investigated the effect of Fe3+ ionic substitution in hydroxyapatite on UV absorption and optical band structure modifications. Increasing Fe content resulted in improved UV absorption due to a decrease in bandgap. The use of marine biowaste as a source of hydroxyapatite may have potential applications in UV protective sunscreen filters.
The effect of Fe3+ ionic substitution in hydroxyapatite (Ca10-xFex(PO4)(6)(OH)(2)) was studied using structural modifications, resulting in an improvement in UV absorption through a tailored optical band structure. Ca2+ of HA being larger compared to Fe3+ contributes to the shrinkage of the lattice. Undoped HA has a peak at 1085 cm(-1) (v(3) PO43-) which is shifted to 1033 cm(-1) for Fe-HA, because of the perturbation in HA structure. An improvement of UV absorption in the entire UVA and UVB range with an increase in Fe content because of a decrease in bandgap from 5.9 eV to 2.1 eV with undoped and doped HA. Theoretically obtained band gap and optical behaviour of the systems are well correlated with the experimental findings. Moreover, the use of marine biowaste from cuttlefish bone, as the source of HA; low cost and promising UV absorption can have a potential application as UV protective sunscreen filters.
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