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11.    Pt/CuNWs were synthesized with a diameter of 100 nm and a length  of  25−40  ¦Ìm  (Figure  1  a−b).  PtNTs  (Cu)  were synthesized with a wall thickness of 11 nm (as determined by high resolution TEM images), an outer diameter of 100 nm, and  a  length  of  5−20  ¦Ìm  (Figure  1  c−d  and  Supporting Information, Figure S.1). The CuNWs used in the galvanic displacement had an outer diameter of 100 nm and a length of 40−50 ¦Ìm (Supporting Information, Figure S.2). Previously synthesized PtNTs (Ag) had a wall thickness of 5 nm, an outer diameter  of  60  nm,  and  a  length  of  5−20  ¦Ìm. 9,10 The  Pt loading of Pt/CuNWs and PtNTs (Cu) was 18 wt % (total mass, 82 wt % Cu) and 95 wt % (total mass, 5 wt % Cu), respectively.  Previously  synthesized  PtNTs  (Ag)  were  also found to have a Pt content of 97 wt % (total mass, 3 wt % Ag). Pt  loadings  were  determined  by  energy  dispersive  X-ray spectroscopy (EDS).
12.    SAED patterns of CuNWs matched those previously found by Zeng et al. and con fi rmed the presence of single twinned CuNWs  with  growth  in  the  [1,−1,0]  direction  (Supporting Information,  Figure  S.3). 15,17 High  resolution  TEM  images showed  a  [1,−1,1]  lattice  spacing  of  0.25  nm  (Supporting Information,  Figure  S.4).  SAED  patterns  of  PtNTs  also matched the patterns of CuNWs provided by Zeng et al. 1 The  PtNTs  therefore  grew  in  the  [1,−1,0]  direction;  high resolution TEM images con fi rmed a [1,−1,1] lattice spacing of 0.25 nm. The ability of Pt to maintain the growth directions and lattice spacing of CuNWs was in part attributed to matches in crystal structure and similar atomic size.

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