Journal
CRYSTENGCOMM
Volume 17, Issue 30, Pages 5710-5716Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ce00870k
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Funding
- National Natural Science Foundation of China [11174103, 11474124]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20130061110012]
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In this work, hierarchical flower-like tungsten trioxide (WO3) nanostructures assembled by needle-like single-crystalline nanosheets were fabricated. These were synthesized via a facile and simple solvothermal method at a rather low temperature (100 degrees C) without any surfactants or templates. Time-dependent experiments were carried out to understand the formation process, which undergoes four stages: polymerizing, nucleating, assembling and growing from WO42- to the flower-like WO3. The as-prepared WO3 microflowers exhibit a good reversibility, fast response time (0.9 s) and recovery time (19 s) and good sensing selectivity at a relatively low working temperature (160 degrees C) after exposing to hydrogen sulfide (H2S). Such excellent performance can be attributed to the highly exposed surface area and the assembling of single-crystalline nanosheets. The sensing process is tentatively explained in terms of the adsorption-desorption mechanism and chemical kinetics theories are discussed in detail.
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