1 research outputs found
Vapor–Solid Growth of p‑Te/n-SnO<sub>2</sub> Hierarchical Heterostructures and Their Enhanced Room-Temperature Gas Sensing Properties
We have synthesized brushlike p-Te/n-SnO<sub>2</sub> hierarchical heterostructures by a two-step thermal vapor
transport process. The morphologies of the branched Te nanostructures
can be manipulated by adjusting the source temperature or the argon
flow rate. The growth of the branched Te nanotubes on the SnO<sub>2</sub> nanowire backbones can be ascribed to the vapor–solid
(VS) growth mechanism, in which the inherent anisotropic nature of
Te lattice and/or dislocations lying along the Te nanotubes axis should
play critical roles. When exposed to CO and NO<sub>2</sub> gases at
room temperature, Te/SnO<sub>2</sub> hierarchical heterostructures
changed the resistance in the same trend and exhibited much higher
responses and faster response speeds than the Te nanotube counterparts.
The enhancement in gas sensing performance can be ascribed to the
higher specific surface areas and formations of numerous Te/Te or
TeO<sub>2</sub>/TeO<sub>2</sub> bridging point contacts and additional
p-Te/n-SnO<sub>2</sub> heterojunctions