position and shape in various TM doping, revealing that the
TM atoms substitute for Ti atoms at the same site around Ti
atoms. Since the first shell was due to a single scattering of O
atoms, and several multiple scatterings were involved in the
third shell, these two shells give no additional information
about the dopant position. Therefore, only the second shell was
refined to extract quantitative structural parameters (Table S1).
The Ti−Ti contribution at a distance of 3.01 Å for rutile TiO2
nanowires and the CN around 1.93 is consistent with the bulk
value for rutile TiO2 (JCPDS file no. 88-1175). With regard to
the TM doping, considerable contributions from the single
scattering of TMs around Ti atoms were present in various
cases of doped TiO2 samples, revealing the TM atoms
significantly exist around absorbing Ti atoms. Although the
CN for the Ti−TM path cannot precisely reflect the doping
amount in rutile crystal due to the low concentration of
dopants (2%), this result still demonstrates the effectiveness of
doping with TM in the present molten-salt method.