|
Title
|
|
|
|
Effects of Ag additive in low temperature CO detection with based gas sensors
| |
|
Author
|
|
|
|
| |
|
Abstract
|
|
|
|
| Nanocomposites In2O3/Ag obtained by ultraviolet (UV) photoreduction and impregnation methods were studied as materials for CO sensors operating in the temperature range 25-250 degrees C. Nanocrystalline In2O3 and In2O3/Ag nanocomposites were characterized by X-ray diffraction (XRD), single-point Brunauer-Emmet-Teller (BET) method, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) with energy dispersive X-ray (EDX) mapping. The active surface sites were investigated using Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) spectroscopy and thermo-programmed reduction with hydrogen (TPR-H-2) method. Sensor measurements in the presence of 15 ppm CO demonstrated that UV treatment leads to a complete loss of In2O3 sensor sensitivity, while In2O3/Ag-UV nanocomposite synthesized by UV photoreduction demonstrates an increased sensor signal to CO at T < 200 degrees C. The observed high sensor response of the In2O3/Ag-UV nanocomposite at room temperature may be due to the realization of an additional mechanism of CO oxidation with participation of surface hydroxyl groups associated via hydrogen bonds. |
| |
|
Language
|
|
|
|
English
| |
|
Source (journal)
|
|
|
|
Nanomaterials
| |
|
Publication
|
|
|
|
2018
| |
|
ISSN
|
|
|
|
2079-4991
| |
|
DOI
|
|
|
|
10.3390/NANO8100801
| |
|
Volume/pages
|
|
|
|
8
:10
(2018)
, 15 p.
| |
|
Article Reference
|
|
|
|
801
| |
|
ISI
|
|
|
|
000451174100057
| |
|
Medium
|
|
|
|
E-only publicatie
| |
|
Full text (Publisher's DOI)
|
|
|
|
| |
|
Full text (open access)
|
|
|
|
| |
|