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A novel CO sensor based on the point contact between Pd decorated TiO2 nanotubes array.

Xu Liu¹, Yunhan Ling, Liang Huang

¹Laboratory of Advanced Materials, Tsinghua University, Beijing 100084, PR China.

Journal of Nanoscience and Nanotechnology

|May 8, 2013

Summary

A novel palladium-decorated titanium dioxide nanotube structure enhances carbon monoxide (CO) sensor sensitivity. This nanostructure, utilizing point contacts, shows significant temperature-dependent CO detection capabilities.

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Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Developing highly sensitive carbon monoxide (CO) sensors is crucial for environmental monitoring and safety.
Titanium dioxide (TiO2) nanotubes offer a promising platform for gas sensing due to their high surface area and tunable properties.
Palladium (Pd) nanoparticles are known to enhance the catalytic activity and sensitivity of semiconductor-based gas sensors.

Purpose of the Study:

To design and fabricate a novel nanostructure for a highly sensitive CO sensor.
To investigate the CO sensing performance of palladium-decorated TiO2 nanotubes at point contacts.
To understand the underlying mechanism of CO detection in the proposed sensor.

Main Methods:

Fabrication of TiO2 nanotube arrays on titanium wire via electrochemical anodic oxidation.

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Modification of TiO2 nanotubes with Pd catalytic nanoparticles using micro-emulsion electrochemical deposition.

Characterization of surface morphology using field emission scanning electron microscopy (FE-SEM).

Investigation of CO sensitivity through current-voltage (I-V) characteristic measurements at the point contact.

Main Results:

Pd nanoparticles were observed to grow epitaxially along the TiO2 nanotube walls and distribute on their surface.
The Pd-decorated TiO2 nanotube point contact sensor demonstrated significant temperature-dependent sensitivity to CO.
Analysis of I-V curves revealed the formation of a Schottky barrier at the contact, and its barrier height was calculated.

Conclusions:

The proposed nanostructure of Pd-decorated TiO2 nanotubes effectively enhances CO sensor sensitivity.
The sensor's performance is strongly influenced by temperature due to the formation of a Schottky barrier at the Pd-TiO2 contact.
This study presents a viable approach for developing advanced CO gas sensors with improved performance.