Potentiometric Detection of VOCs using Non-Nernstian SmFeO3/Pt/YSZ/Pt Sensors

2006 ◽  
Vol 972 ◽  
Author(s):  
Laure Chevallier ◽  
Elisabetta Di Bartolomeo ◽  
Enrico Traversa ◽  
Masami Mori ◽  
Yoshihiko Sadaoka
Keyword(s):  
Electrochemical Sensors ◽  
Gas Sensing ◽  
Reference Electrode ◽  
Perovskite Oxide ◽  
Potentiometric Detection ◽  
Oxide Powders ◽  
Volatile Organic ◽  
Potentiometric Measurements ◽  
P Type ◽  
Reducing Gases

AbstractElectrochemical sensors for Volatile Organic Compound (VOCs) based on commercial YSZ layers were fabricated using Pt as reference electrode and SmFeO3 perovskite oxide as a sensing electrode, both exposed to the same gas environment. Pt was sputtered on YSZ layers while SmFeO3 p-type semiconducting oxide was deposited by electrophoretic deposition (EPD). Nanometric SmFeO3 oxide powders were selected because they have already shown good sensing performance in semiconducting sensors for oxidizing gases such as NO2 and ozone, and reducing gases, such as VOCs. Potentiometric measurements were performed under exposure to different concentrations of VOCs such as: methyl ethyl ketone (MEK), ethanol (EtOH) and acetic acid (AA). The best gas sensing response was obtained at 400°C.

scholarly journals Electrophoretic deposition of Au NPs on CNT networks for sensitive NO<sub>2</sub> detection

2014 ◽  
Vol 3 (2) ◽  
pp. 245-252 ◽  
Author(s):  
E. Dilonardo ◽  
M. Penza ◽  
M. Alvisi ◽  
C. Di Franco ◽  
D. Suriano ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Gas Sensing ◽  
Spectroscopic Characterization ◽  
Core Diameter ◽  
Au Nps ◽  
Transmission Electron ◽  
P Type ◽  
Reducing Gases ◽  
The Impact

Abstract. In the present study, Au-surfactant core-shell colloidal nanoparticles (NPs) with controlled dimension and composition were synthesized by sacrificial anode electrolysis. Transmission electron microscopy (TEM) revealed that Au NPs core diameter is between 8 and 12 nm, as a function of the electrosynthesis conditions. Moreover, surface spectroscopic characterization by X-ray photoelectron spectroscopy (XPS) analysis confirmed the presence of nanosized gold phase. Controlled amounts of Au NPs were then deposited electrophoretically on carbon nanotube (CNT) networked films. The resulting hybrid materials were morphologically and chemically characterized using TEM, SEM (scanning electron microscopy) and XPS analyses, which revealed the presence of nanoscale gold, and its successful deposition on CNTs. Au NP/CNT networked films were tested as active layers in a two-pole resistive NO2 sensor for sub-ppm detection in the temperature range of 100–200 °C. Au NP/CNT exhibited a p-type response with a decrease in the electrical resistance upon exposure to oxidizing NO2 gas and an increase in resistance upon exposure to reducing gases (e.g. NH3). It was also demonstrated that the sensitivity of the Au NP/CNT-based sensors depends on Au loading; therefore, the impact of the Au loading on gas sensing performance was investigated as a function of the working temperature, gas concentration and interfering gases.

Characteristics of P-type Semiconducting MgCr2O4-TiO2 Ceramics for Gas Sensing Devices

2015 ◽  
Vol 135 (8) ◽  
pp. 317-322
Author(s):  
Mitsuaki Yano ◽  
Yousuke Hirahara ◽  
Jiro Terada ◽  
Shigehiko Sasa ◽  
Sigeru Omatu
Keyword(s):  
Gas Sensing ◽  
P Type

P-type Co3O4 nanoarrays decorated on the surface of n-type flower-like WO3 nanosheets for high-performance gas sensing

2019 ◽  
Vol 288 ◽  
pp. 104-112 ◽  
Author(s):  
Yanghai Gui ◽  
Lele Yang ◽  
Kuan Tian ◽  
Hongzhong Zhang ◽  
Shaoming Fang
Keyword(s):  
High Performance ◽  
Gas Sensing ◽  
P Type ◽  
Co3o4 Nanoarrays

Gas sensing properties of Zn-doped p-type nickel ferrite

2012 ◽  
Vol 171-172 ◽  
pp. 354-360 ◽  
Author(s):  
A. Sutka ◽  
G. Mezinskis ◽  
A. Lusis ◽  
M. Stingaciu
Keyword(s):  
Nickel Ferrite ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
P Type ◽  
Type Nickel

Intrinsic n- and p-Type MgZnO Nanorods for Deep-UV Detection and Room-Temperature Gas Sensing

2015 ◽  
Vol 119 (52) ◽  
pp. 29186-29192 ◽  
Author(s):  
Ruey-Chi Wang ◽  
Yu-Xian Lin ◽  
Jia-Jun Wu
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Uv Detection ◽  
Deep Uv ◽  
P Type

scholarly journals Silver Enhances Hematite Nanoparticles Based Ethanol Sensor Response and Selectivity at Room Temperature

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 440
Author(s):  
Daniel Garcia-Osorio ◽  
Pilar Hidalgo-Falla ◽  
Henrique E. M. Peres ◽  
Josue M. Gonçalves ◽  
Koiti Araki ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ethanol Vapor ◽  
Oxide Semiconductor ◽  
Charge Carrier Density ◽  
Ethanol Sensor ◽  
Volatile Organic

Gas sensors are fundamental for continuous online monitoring of volatile organic compounds. Gas sensors based on semiconductor materials have demonstrated to be highly competitive, but are generally made of expensive materials and operate at high temperatures, which are drawbacks of these technologies. Herein is described a novel ethanol sensor for room temperature (25 °C) measurements based on hematite (α‑Fe2O3)/silver nanoparticles. The AgNPs were shown to increase the oxide semiconductor charge carrier density, but especially to enhance the ethanol adsorption rate boosting the selectivity and sensitivity, thus allowing quantification of ethanol vapor in 2–35 mg L−1 range with an excellent linear relationship. In addition, the α-Fe2O3/Ag 3.0 wt% nanocomposite is cheap, and easy to make and process, imparting high perspectives for real applications in breath analyzers and/or sensors in food and beverage industries. This work contributes to the advance of gas sensing at ambient temperature as a competitive alternative for quantification of conventional volatile organic compounds.

Guidelines for potentiometric measurements in suspensions Part B. Guidelines for practical pH measurements in soil suspensions (IUPAC Recommendations 2006)

2007 ◽  
Vol 79 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Srecko F. Oman ◽  
M. Filomena Camões ◽  
Kipton J. Powell ◽  
Raj Rajagopalan ◽  
Petra Spitzer
Keyword(s):  
Reference Electrode ◽  
Operational Definition ◽  
Indicator Electrode ◽  
Liquid Junction ◽  
Cell Potential ◽  
Technical Report ◽  
Potentiometric Measurements ◽  
Suspension Effect ◽  
The Difference ◽  
Definition Of

The measured cell potentials for suspension potentiometric cells have been interpreted and explained by a detailed analysis of the schemes for these cells ["Guidelines for potentiometric measurements in suspensions. Part A. The suspension effect (IUPAC Technical Report", Pure Appl. Chem.79, 67 (2007)]. Some former disagreements amongst investigations have been clarified. A new unambiguous operational definition of the suspension effect (SE) is presented. It is defined as the difference in cell potential for two suspension potentiometric cells, one with both electrodes in the separated equilibrium solution (eqs) and the other with both electrodes in the sediment or suspension. This potential difference is the sum of the change in the indicator electrode (IE) potential and the change in the liquid junction potential of the reference electrode (RE), when the electrodes are used for measurement, once in the sediment of the suspension and then in its eqs.

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