Abstract
A novel gas ionization sensor using Pd nanoparticle-capped ZnO (Pd/ZnO) nanorods as the anode is proposed. The Pd/ZnO nanorod-based sensors, compared with the bare ZnO nanorod, show lower breakdown voltage for the detected gases with good sensitivity and selectivity. Moreover, the sensors exhibit stable performance after more than 200 tests for both inert and active gases. The simple, low-cost, Pd/ZnO nanorod-based field-ionization gas sensors presented in this study have potential applications in the field of gas sensor devices.
Highlights
Gas sensors have attracted considerable attention in recent years because of their huge potential applications, such as pollution detection, environment protection, gas detection for counter-terrorism, etc. [1]
It is clearly seen that the bare Pd nanoparticle-capped ZnO (ZnO) nanorod has a rather smooth surface and the surface of Pd nanoparticle-capped ZnO (Pd/ZnO) nanorod is distributed with Pd nanoparticles with diameters of about 5 nm
The device was first tested in air under 100 Pa with anode-cathode separation of 500 μm using bare ZnO and Pd/ZnO nanorods (Figure 2a)
Summary
Gas sensors have attracted considerable attention in recent years because of their huge potential applications, such as pollution detection, environment protection, gas detection for counter-terrorism, etc. [1]. The modification of the surface of 1D ZnO nanostructures to obtain lower breakdown voltage is one of the key issues for gas sensor applications. We introduce a physical gas sensor using palladium (Pd) nanoparticle-capped ZnO (Pd/ZnO) nanorods as the anode.
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