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Bamboo-like Te nanotubes were synthesized via the galvanic displacement reaction of NiFe nanowires with Ni-rich and Fe-rich segments. The thick and thin components of the synthesized Te nanotubes were converted from the Ni-rich and Fe-rich segments in the NiFe nanowires respectively. The dimensions of the Te nanotubes were controlled by employing sacrificial NiFe nanowires with tailored dimensions as the template for the galvanic displacement reaction. The segment lengths of the Te nanotubes were found to be dependent on those of the sacrificial NiFe nanowires. The galvanic displacement reaction was characterized by analyzing the open circuit potential and the corrosion resistance.

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We investigated sensing properties on NOx (g) of single tellurium (Te) nanoribbon-based nanodevices. The synthesized Te nanoribbons were aligned at well-defined locations using a lithographically patterned nanowire electrodeposition (LPNE) technique. The shape and length were feasibly modified by the designed lithographical pattern, and the width was tailored by the applied electrochemical parameters. Temperature-dependent electrical resistance was analyzed with as-synthesized and annealed Te nanoribbons in the temperature ranging from 15 K to 300 K, where the calculated thermal activation energies of as-synthesized and annealed Te nanoribbons were 35.7 meV and 19.2 meV, respectively. Room-temperature sensor performance of as-synthesized and annealed single Te nanoribbons on detecting NOx (g) was investigated as a function of the tailored concentration of NOx (g). Compared to a sensitivity of 16±2.9% on detecting NOx (g) of 10 ppm in the as-synthesized single Te nanoribbon sensor aligned between Au/Cr electrodes, the sensitivity of 21±3.2% on detecting NOx (g) of 10 ppm at room temperature was demonstrated by single Te nanoribbon-based sensor annealed at 200oC for 1 hour in 5 % H2/N2 (g). The effects of annealing on sensing properties have demonstrated the improved sensitivity in the annealed Te nanoribbons..