4.8 Article

Phase-Transition Induced Conversion into a Photothermal Material: Quasi-Metallic WO2.9 Nanorods for Solar Water Evaporation and Anticancer Photothermal Therapy

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 33, Pages 10666-10671

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201806611

Keywords

hydrogenation; nanorod; photothermal therapy; solar water evaporation; WO2.9

Funding

  1. National Natural Science Foundation of China [21473045, 51401066, 51772066, U1530401]
  2. State Key Laboratory of Urban Water Resource and Environment [2018DX04]

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Phase transition from WO3 to sub-stoichiometric WO2.9 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 WO2.9 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.

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