Single‐Crystalline In2O3 Nanotubes Filled with In

Single‐crystalline In 2 O 3 nanotubes with cubic structure were synthesized via a physical vapor depostion process. The nanotubes grew along the 〈111〉 direction and were continuously filled with metallic In (see Figure). Photoluminescence measurement results displayed strong orange emission. Indium‐filled In 2 O 3 nanotubes represent an exciting system and offer great potential for application in electronic devices or “nanothermometers”.