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. 2017 Feb 6;12:89. doi: 10.1186/s11671-017-1875-5

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Comparison between anatase- and rutile-predominated p-type chromium Cr-doped TiO₂ nanopowders obtained by flame spray synthesis (FSS): a X-ray diffraction patterns, b TEM/SEM images, c resistive-type response R/R ₀ to hydrogen at 300 °C, d diffused reflectance R _Diff as a function of wavelength λ; f _R, rutile content; d _A, diameter of anatase crystallite; d _R, diameter of rutile crystallite; R ₀, electrical resistivity in the reference atmosphere (air); R, electrical resistivity under exposure to detected gas and hν, photon energy