Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 21, Pages 10387-10397Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta11208k
Keywords
-
Funding
- National Natural Science Foundations of China [21371022, U1507119]
- National Key Research and Development Program of China [2016YFB0301601, 2016YFB0301602]
- National Major Scientific Instruments Development Project of China [21627813]
- Fundamental Research Funds for the Central Universities [YS1406]
Ask authors/readers for more resources
The development of highly active, sensitive and durable gas sensing materials for the detection of volatile organic compounds (VOCs) is extremely desirable for gas sensors. Herein, a series of mesoporous hierarchical Co3O4-TiO2 p-n heterojunctions have been prepared for the first time via the facile thermal conversion of hierarchical CoTi layered double hydroxides (CoTi-LDHs) precursors at 300-400 degrees C. The resulting Co3O4-TiO2 nanocomposites showed superior sensing performance towards toluene and xylene in comparison with Co3O4 and TiO2 at low temperature, and the sample with a Co/Ti molar ratio of 4 shows an optimal response (R-g/R-a = 113, R-g and R-a denote the sensor resistance in a target gas and in air, respectively) to 50 ppm xylene at 115 degrees C. The ultrahigh sensing activity of these Co3O4-TiO2 p-n heterojunctions originates from their hierarchical structure, high specific surface area (>120 m(2) g(-1)), and the formation of numerous p-n heterojunctions, which results in full exposure of active sites, easy adsorption of oxygen and target gases, and large modulation of resistance. Importantly, hierarchical Co3O4-TiO2 heterojunctions possess advantages of simple preparation, structural stability, good selectivity and long-term durability. Therefore, this work provides a facile approach for the preparation of hierarchical Co3O4-TiO2 p-n heterojunctions with excellent activity, sensitivity and durability, which can be used as a promising material for the development of high-performance gas sensors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available