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Phase‐Transition Induced Conversion into a Photothermal Material: Quasi‐Metallic WO 2.9 Nanorods for Solar Water Evaporation and Anticancer Photothermal Therapy
Author(s) -
Sun Lei,
Li Zhuo,
Su Rui,
Wang Yuanlin,
Li Zhenglin,
Du Baosheng,
Sun Ye,
Guan Pengfei,
Besenbacher Flemming,
Yu Miao
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201806611
Subject(s) - photothermal therapy , nanorod , materials science , energy conversion efficiency , photothermal effect , irradiation , crystallinity , band gap , optoelectronics , evaporation , nanotechnology , chemical engineering , composite material , nuclear physics , physics , engineering , thermodynamics
Phase transition from WO 3 to sub‐stoichiometric WO 2.9 by a facile method has varied the typical semiconductor to be quasi‐metallic with a narrowed band gap and a shifted Femi energy to the conduction band, while maintaining a high crystallinity. The resultant WO 2.9 nanorods possess a high total absorption capacity (ca. 90.6 %) over the whole solar spectrum as well as significant photothermal conversion capability, affording a conversion efficiency as high as around 86.9 % and a water evaporation efficiency of about 81 % upon solar light irradiation. Meanwhile, the promising potential of the nanorods for anticancer photothermal therapy have been also demonstrated, with a high photothermal conversion efficiency (ca. 44.9 %) upon single wavelength near‐infrared irradiation and a high tumor inhibition rate (ca. 98.5 %). This study may have opened up a feasible route to produce high‐performance photothermal materials from well‐developed oxides.