ars.els-cdn.com · web viewfigure. s1 sem and tem images of (a-c) cr 2 o 3-h and (d-f) cr 2 o 3-ys...
TRANSCRIPT
Supporting Information
A strategy for ultrasensitive and selective detection of methylamine using p-type
Cr2O3: Morphological design of sensing materials, control of charge carrier
concentrations, and configurational tuning of Au catalysts
Tae-Hyung Kima, Ji-Wook Yoona, Yun Chan Kanga,
Faissal Abdel-Hadyb, Abdulaziz A. Wazzanb, and Jong-Heun Leea,b,*
aDepartment of Materials Science and Engineering,
Korea University, Seoul 02841, Republic of Korea
bDepartment of Chemical and Materials Engineering, King Abdulaziz University, Jeddah 21589,
Saudi Arabia
* Author to whom correspondence should be addressed.
Email: [email protected] ; Fax: +82-2-928-3584 ; Tel: +82-2-3290-3282
Figure. S1 SEM and TEM images of (a-c) Cr2O3-H and (d-f) Cr2O3-YS spheres
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Figure. S2 Mechanism of the formation of the multi-shelled Cr2O3 yolk-shell spheres
Figure. S3 TEM images of 1S-Au-Cr2O3-YS spheres
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Figure. S4 TEM images of 2S-Au-Cr2O3-YS spheres
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Figure. S5 XPS spectra of 1S-Au-Cr2O3-YS and 2S-Au-Cr2O3-YS spheres: (a) full range
spectra and (b) Au 4f5/2 and 4f7/2 peaks
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Figure. S6 90% response time (tres) upon exposure to 5 ppm TMA and 90% recovery time
(trecov) upon exposure to air at 225 oC. (a) Cr2O3-H, (b) Cr2O3-YS, (c) 1S-Au-Cr2O3-
YS, and (d) 2S-Au-Cr2O3-YS sensors
Figure. S7 Dynamic sensing transients to 5 ppm TMA at 225 oC: (a) Cr2O3-H, (b) Cr2O3-YS,
(c) 1S-Au-Cr2O3-YS, and (d) 2S-Au-Cr2O3-YS sensors
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