Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 224, Issue -, Pages 381-390Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.10.063
Keywords
Gas sensor; Oxide; Porous material; SnO2 microspheres; Amine detection
Funding
- NSFC [21371070, 21401066, 21401016]
- National Basic Research Program of China [2013CB632403]
- Jilin Province Science and Technology Development Projects [20150520003JH, 20140101041JC, 20130204001GX]
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Organic amines are a kind of industrially important starting material for the manufacture of dyes and pharmaceuticals. But monitoring low-concentration amine vapors, especially those with a high molecular weight, is still a challenging task during industrial processes because the low permeability and diffusivity of amines largely limit their interaction with the surface of sensing element. Herein, we report the template-free solvothermal synthesis of uniform nanoparticle-assembled Sn02 microspheres with an rich interparticle porosity, and the thermal-driven tuning of their porosity structure with the sphere-like morphological preservation. This further allows us to fabricate a sensing film with a tunable interparticle porosity structure and an optimized gas diffusivity in the sensing film. As a result, the optimized SnO2 sensing film is shown to have the ability to effectively detect low-concentration amine vapors with short response time and high response value in the testing range from Ito 200 ppm. (C) 2015 Elsevier B.V. All rights reserved.
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