Hierarchical flowerlike WO3 nanostructures assembled by porous nanoflakes for enhanced NO gas sensing
| Autor: | Ze-Xing Cai, Huayao Li, Xin Guo, Jun-Chao Ding |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Nanostructure Metals and Alloys Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electrical conduction Materials Chemistry Self-assembly Electrical and Electronic Engineering 0210 nano-technology Porosity Instrumentation |
| Zdroj: | Sensors and Actuators B: Chemical. 246:225-234 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2017.02.075 |
| Popis: | Hierarchical flowerlike WO 3 nanostructures, assembled from single crystalline WO 3 nanoflakes, were prepared on patterned FTO substrates via a solvothermal technique. The flowerlike nanostructures provide large area of active surfaces, and the interconnected nanoflakes are continuous paths for the electrical conduction. With the addition of PdCl 2 in the precursor solution, the surface of the WO 3 nanoflakes was etched and became rough and porous, which is advantageous for gas sensing. A response value of 203 to 20 ppm NO was achieved at 200 °C by the flowerlike WO 3 with 0.1 mmol PdCl 2 addition in the precursor solution, while the sample with 0.01 mmol PdCl 2 addition always shows fast response and recovery speed (e.g. 27 s/23 s at 200 °C). |
| Databáze: | OpenAIRE |
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