Next Article in Journal
Characteristics of Graphene Oxide Films Reduced by Using an Atmospheric Plasma System
Next Article in Special Issue
Two-Dimensional Nanomaterials for Gas Sensing Applications: The Role of Theoretical Calculations
Previous Article in Journal
Preparation of Self-supporting Bagasse Cellulose Nanofibrils Hydrogels Induced by Zinc Ions
Previous Article in Special Issue
Surface Properties of SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM
Article Menu
Issue 10 (October) cover image

Export Article

Open AccessArticle
Nanomaterials 2018, 8(10), 801; https://doi.org/10.3390/nano8100801

Effects of Ag Additive in Low Temperature CO Detection with In2O3 Based Gas Sensors

1
Faculty of Materials Science, Moscow State University, Moscow 119991, Russia
2
Chemistry Department, Moscow State University, Moscow 119991, Russia
3
EMAT, University of Antwerp, B-2020 Antwerp, Belgium
4
Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences, Moscow 119991, Russia
5
LISM, Moscow State Technological University Stankin, Moscow 127055, Russia
6
Faculty of Physics, Moscow State University, Moscow 119991, Russia
7
National Research Center Kurchatov Institute, Moscow 123182, Russia
8
Department of Nano-, Bio-, Information Technology and Cognitive Science, Moscow Institute of Physics and Technology, Dolgoprudny, Moscow 141701, Russia
*
Author to whom correspondence should be addressed.
Received: 11 September 2018 / Revised: 4 October 2018 / Accepted: 5 October 2018 / Published: 8 October 2018
(This article belongs to the Special Issue Development of Semiconductor Nanomaterials for Gas Sensors)
Full-Text   |   PDF [7257 KB, uploaded 8 October 2018]   |  

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 °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-H2) 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 °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. View Full-Text
Keywords: nanocrystalline semiconductor oxides; nanocomposites; indium oxide; silver additive; carbon monoxide; gas sensor; surface hydroxyl groups; room temperature response nanocrystalline semiconductor oxides; nanocomposites; indium oxide; silver additive; carbon monoxide; gas sensor; surface hydroxyl groups; room temperature response
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Naberezhnyi, D.; Rumyantseva, M.; Filatova, D.; Batuk, M.; Hadermann, J.; Baranchikov, A.; Khmelevsky, N.; Aksenenko, A.; Konstantinova, E.; Gaskov, A. Effects of Ag Additive in Low Temperature CO Detection with In2O3 Based Gas Sensors. Nanomaterials 2018, 8, 801.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Nanomaterials EISSN 2079-4991 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top