| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advanced Ceramics for Environmental Remediation
|
| Presentation Title |
Optimization of 1D Core-shell Heterostructures for Gas Sensing |
| Author(s) |
Nicola Pinna |
| On-Site Speaker (Planned) |
Nicola Pinna |
| Abstract Scope |
Hierarchical core-shell heterostructures composed of p-,n-type and insulating metal oxide shells deposited onto carbon nanotubes (CNTs) were synthesized using atomic layer deposition. Precisely controlled films of alternating metal oxides were uniformly deposited onto the inner and outer walls of the CNTs.The morphological, microstructural and electrical characteristics of the as prepared core-shell heterostructures were thoroughly investigated. The electrical resistance measurements highlighted the large influence of the metal oxides thickness and charge carriers types on increasing of many order of magnitude the baseline resistance of the core-shell heterostructures with various thicknesses of the metal oxide shell layers, suggesting that the conductivity of the sensors is dominated by Schottky barrier junctions across the n-p interfaces.The behavior of our sensors was investigated for low concentrations of volatile organic compounds and pollutants.The gas sensing response of the heterostructures showed a strong dependence on the thickness of the metal oxide shell layers and the typeof heterostructures... |