Authors:
Yeon-Tae Yu
1
;
Sanjit Manohar Majhi
1
;
Gautam K. Naik
1
and
Ho-Geum Song
2
Affiliations:
1
Chonbuk National University, Korea, Republic of
;
2
Ogam Technology, Korea, Republic of
Keyword(s):
Gas Sensor, Palladium, ZnO, Core-shell, Nanoparticles, Response.
Related
Ontology
Subjects/Areas/Topics:
Applications and Uses
;
Environment Monitoring
;
Gas Analysis and Sensing
;
Home Monitoring and Assisted Living Applications
;
Sensor Networks
Abstract:
Two different sizes of Pd@ZnO core-shell nanoparticles (NPs) have been prepared by using two different
sizes of Pd NPs (15 and 50 nm) as metal cores and applied for acetaldehyde gas sensing. Transmission
electron microscopy images revealed that the overall size of two sensing materials such as Pd15@ZnO and
Pd50@ZnO core-shell NPs are 80-100 nm and 100-120 nm, respectively. Xray-diffraction pattern revealed
that the oxidation of Pd metal core was started from 300°C. The spherical shape and size are maintained
after the Pd@ZnO core-shell NPs was calcined at 500°C for 2 h. PdO15@ZnO core-shell NPs showed
higher response to acetaldehyde. The maximum response of PdO15@ZnO core-shell NPs to 100 ppm of
acetaldehyde at 350 °C was 75, whereas the maximum response of PdO50@ZnO core-shell NPs to 100 ppm
of acetaldehyde was 28 as compared to the pure ZnO NPs (Rs=18). The high response of PdO15@ZnO coreshell
NPs than PdO50@ZnO core-shell NPs is due to the smaller size of PdO core, which
has more catalytic
activity than 50 nm sized PdO core.
(More)