Preparation and gas sensing performances of palladium surface-modified flower-like SnO2 nanopowders

Flower-like SnO2 nanopowders prepared by a hydrothermal method were surface modified with palla- dium via impregnation. The crystal structure, morphology, and surface chemistry states of the samples were characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and X-ray...

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Bibliographic Details
Published in:Particuology 2013-12, Vol.11 (6), p.743-747
Main Authors: Jiao, Wanli, Zhang, Lei
Format: Article
Language:English
Subjects:
Ethyl alcohol
Flower-like structure
Gas sensing
Gas sensors
Hydrothermal method
Impregnation
Nanostructure
Palladium
Sensors
SnO2
SnO2 nanopowders
Tin dioxide
Tin oxides
X-ray photoelectron spectroscopy
X射线光电子能谱
扫描电子显微镜
气敏性能
粉体制备
纳米粉体
表面化学态
表面改性
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Summary:Flower-like SnO2 nanopowders prepared by a hydrothermal method were surface modified with palla- dium via impregnation. The crystal structure, morphology, and surface chemistry states of the samples were characterized by means of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and X-ray photoelectron spectroscopy （XPS）, respectively. The gas sensing performances were also investigated. For a hydrothermal temperature of 220 ℃, flower-like SnO2 nanoparticles consist of nanorods with diameters of 40 nm and lengths of 100 nm. The XPS and XRD results reveal that palladium exists in the Pd0 chemical state but the crystal is too small to be detected. The 0.3 wt% Pd modified SnO2 sensor shows better sensi- tivity, up to 21, for 70 μL/L ethanol gas at an optimal working temperature of 250 ℃. The quick response time （3 s） and fast recovery time （-20 s） are the main characteristics of this sensor.
ISSN:1674-2001
2210-4291
DOI:10.1016/j.partic.2013.01.003