Highly sensitive and selective acetone sensing performance of WO3 nanofibers functionalized by Rh2O3 nanoparticles

In this work, catalytic Rh2O3-functionalized WO3 nanofibers (NFs) were synthesized via an electrospinning route and used as a highly selective acetone-sensing layer for potential diagnosis of diabetes. Catalytic rhodium nanoparticles (Rh NPs) with average diameters of 5.0±0.52nm, which were synthesi...

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Veröffentlicht in:Sensors and actuators. B, Chemical Chemical, 2016-03, Vol.224, p.185-192
Hauptverfasser: Kim, Nam-Hoon, Choi, Seon-Jin, Kim, Sang-Joon, Cho, Hee-Jin, Jang, Ji-Soo, Koo, Won-Tae, Kim, Moonil, Kim, Il-Doo
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Sprache:eng
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Zusammenfassung:In this work, catalytic Rh2O3-functionalized WO3 nanofibers (NFs) were synthesized via an electrospinning route and used as a highly selective acetone-sensing layer for potential diagnosis of diabetes. Catalytic rhodium nanoparticles (Rh NPs) with average diameters of 5.0±0.52nm, which were synthesized by the polyol process, were dispersed in water with W precursor and poly(vinylpyrrolidone) (PVP) for electrospinning. As-spun Rh NP-loaded W precursor/PVP composite NFs were calcined at 600°C for 1h in air atmosphere to achieve Rh2O3-decorated WO3 NFs. Microstructure evolution and chemical composition of Rh2O3-decorated WO3 NFs as a function of Rh-loading amounts, i.e., 0.01wt%, 0.05wt%, 0.10wt%, and 0.15wt%, were examined using energy-dispersive X-ray spectroscopy (EDS), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM). The mean size (30nm) of the WO3 crystallites in Rh2O3-decorated WO3 NFs was much smaller than that (60nm) of the WO3 crystallites in pristine WO3 NFs. The Rh2O3-decorated WO3 NFs showed outstanding acetone (CH3COCH3) sensing response (Rair/Rgas=41.2 to 5ppm), which was 4.6 times higher than the response (Rair/Rgas=9.0 to 5ppm) of pristine WO3 NFs at highly humid atmosphere (95% RH). In addition, superior acetone cross-sensitivity of the Rh2O3-decorated WO3 NFs was observed in other interfering gases such as pentane (n-C5H12), ammonia (NH3), toluene (C6H5CH3), carbon monoxide (CO), and ethanol (C2H5OH) at 5ppm. These results are highly promising for the accurate and selective detection of acetone in exhaled breath for potential diagnosis of diabetes.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2015.10.021