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. 2014 Oct 31;19(11):17747–17762. doi: 10.3390/molecules191117747

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© 2014 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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SEM images of: (A) hydrothermally synthesised WO₃ with no additives (W0); (B) hydrothermally synthesised WO₃ with Na₂SO₄ added at a SO₄²⁻:WO₄²⁻ ratio of 0.3 (W0.3NaS); (C) hydrothermally synthesised WO₃ with Na₂SO₄ added at a SO₄²⁻:WO₄²⁻ ratio of 7.6 (W7.6NaS); (D) hydrothermally synthesised WO₃ with H₂SO₄ added at a SO₄²⁻:WO₄²⁻ ratio of 0.3 (W0.3HS); (E) hydrothermally synthesised WO₃ with H₂SO₄ added at a SO₄²⁻:WO₄²⁻ ratio of 7.6 (W7.6HS); (F) commercial Sigma Aldrich WO₃ (WSA).