Figure 5.

XPS survey spectra. (a) Low-resolution XPS survey spectra of the pristine TiO2 NRs and Sn/TiO2 NRs with different Sn doping, (b) Ti 2p XPS spectra, (c) O 1 s XPS spectra; (d) Sn 3d XPS spectra.

Sun et al. Nanoscale Research Letters 2013 8:462   doi:10.1186/1556-276X-8-462
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