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Pure and Palladium‐Loaded Co 3 O 4 Hollow Hierarchical Nanostructures with Giant and Ultraselective Chemiresistivity to Xylene and Toluene
Author(s) -
Hwang SuJin,
Choi KwonIl,
Yoon JiWook,
Kang Yun Chan,
Lee JongHeun
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201405076
Subject(s) - toluene , palladium , selectivity , catalysis , materials science , nanostructure , xylene , chemical engineering , chemistry , nanotechnology , organic chemistry , engineering
Pure and palladium‐loaded Co 3 O 4 hollow hierarchical nanostructures consisting of nanosheets have been prepared by solvothermal self‐assembly. The nanostructures exhibited an ultrahigh response and selectivity towards p ‐xylene and toluene. The responses (resistance ratio) of the palladium‐loaded Co 3 O 4 hollow hierarchical nanostructures to 5 ppm of p ‐xylene and toluene were as high as 361 and 305, respectively, whereas the selectivity values (response ratios) towards p ‐xylene and toluene over interference from ethanol were 18.1 and 16.1, respectively. We attributed the giant response and unprecedented high selectivity towards methylbenzenes to the abundant adsorption of oxygen by Co 3 O 4 , the high chemiresistive variation in the Co 3 O 4 nanosheets (thickness≈11 nm), and the catalytic promotion of the specific gas‐sensing reaction. The morphological design of the p‐type Co 3 O 4 nanostructures and loading of the palladium catalyst have paved a new way to monitoring the most representative indoor air pollutants in a highly selective, sensitive, and reliable manner.