4.7 Article

Synthesis of hierarchical SnO2 nanoflowers with enhanced acetic acid gas sensing properties

期刊

APPLIED SURFACE SCIENCE
卷 353, 期 -, 页码 71-78

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.06.089

关键词

Nanoflowers; SnO2; Hydrothermal; Sensor; Formation mechanism

资金

  1. National Natural Science Foundations of China [10874140]
  2. Natural Science Foundational of Gansu province [1308RJZA258]
  3. Key Laboratory Foundation of Atomic and Molecular Physics 82 Functional Materials of Gansu Province
  4. Foundations of Northwest Normal University [NWNU-LKQN-13-18]
  5. College Basic Scientific Research Operation Cost of Gansu province
  6. Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry

向作者/读者索取更多资源

Different morphologies hierarchical flower-like tin dioxide (SnO2) nanostructures were fabricated by changing the volume ratio of glycol and de-ionized water (V-g:V-w=0, 1:2, 1:1 and 2:1) under a template-free and low-cost hydrothermal method and subsequent calcinations. The architectures, morphologies and gas sensing performances of the products were characterized by X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) and gas-sensing measurement device. It can be observed that all the nanoflowers were composed of two-dimensional (2D) nanosheets, and the thickness of nanosheets is only about 9 nm when V-g:V-w = 1:1. The sensor based on the product of Vg:Vw = 1:1 exhibited excellent gas sensing performance toward 500 ppm acetic acid at 260 degrees C, and the response value of this sensor was about 153.6, which was above 7.5 times higher than that of ammonia (about 20.3). In addition, the 3D flower-like SnO2 nanostructures exhibited not only high response and selectivity to ppm level acetone, but also fast response and recovery time within 10 s, demonstrating it can be used as a potential candidate for detecting acetic acid. Finally, the possible formation mechanism was proposed, too. (C) 2015 Elsevier B.V. All rights reserved.

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