Gas Sensing Behavior of High Surface Area Co3O4 Micro/Nano Structures Synthesized by Simple Sonication Process

2012 ◽  
Vol 10 (3) ◽  
pp. 826-832 ◽  
Author(s):  
A. Dhayal Raj ◽  
P. Suresh Kumar ◽  
D. Mangalaraj ◽  
N. Ponpandian ◽  
A. Albert Irudayaraj ◽  
...  
Keyword(s):  
Surface Area ◽  
Gas Sensing ◽  
High Surface ◽  
High Surface Area ◽  
Nano Structures

Metal Oxide Nanoparticles Obtained by Microwave Synthesis and Application in Gas Sensing by Microwave Transduction

2014 ◽  
Vol 605 ◽  
pp. 299-302 ◽  
Author(s):  
Jerome Rossignol ◽  
Didier Stuerga
Keyword(s):  
Metal Oxide ◽  
Surface Area ◽  
Gas Sensing ◽  
Metal Oxide Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Interaction Mechanism ◽  
Ammonia Concentration ◽  
Nanocrystalline Powder ◽  
Sensitive Material

In literature, many papers describe the applications of semiconductor as sensitive material in sensor field. The gas sensor using tin oxide requires a strictly controlled high operating temperature in order to detect both reducing and oxidizing gases. The semiconductor nanoparticles, with their high specific surface area, increase the gas sensing performance. The originality of this work is to valorize the nanoparticle of metal oxide like SnO2, TiO2 obtained by microwave thermohydrolysis synthesis, using a gas sensing microwave transduction. The present synthesis is to prepare metal oxide nanocrystalline powder with a high surface area by microwave-induced thermohydrolysis. We propose to study the influence of the metal oxide nanoparticle, as a sensitive layer, in gas sensing measurement. The pollutant is added into an argon flow (dynamic regim). This work highlights a specific sensor response to each ammonia concentration at room temperature. It shows a quasi-linear relationship between the set of points of the real part of the response and the ammonia concentration. The authors are currently working on these issues as well as the interaction mechanism between adsorbed gas molecules and metal oxide films.

Synthesis and Characterization of Hybrid ZnO@Ag Core-Shell Nanospheres for Gas Sensor Applications

2012 ◽  
Vol 710 ◽  
pp. 768-773 ◽  
Author(s):  
V. Ponnuvelu Dinesh ◽  
P. Biji ◽  
M. Kumaravel ◽  
A.K. Tyagi ◽  
M. Kamaruddin
Keyword(s):  
Surface Area ◽  
Gas Sensing ◽  
High Surface ◽  
High Surface Area ◽  
Silver Nanoclusters ◽  
Core Shell ◽  
Sensor Applications ◽  
Shell Nanostructures ◽  
Sensing Material ◽  
Interfacial Compatibility

ZnO nanospheres were prepared by hydrothermal method using CTAB as protecting ligands. The purified ZnO nanospheres were functionalized using 3-aminopropyl-trimethoxysilane (APTMS) and made into core-shell nanostructures with in-situ reduction of Ag+ into silver nanoclusters. ZnO nanospheres act as the core while silver nanoclusters act as shell material resulting in the formation of ZnO@Ag core-shell nanostructures. The precursor ZnO nanospheres and ZnO@Ag core-shell nanostructures were well characterised structurally by UV-Visible, FT-IR, XRD, and TGA and morphologically by SEM and HR-TEM. The analysis confirms that Ag nanoclusters are attached to ZnO nanospheres with uniform distribution. The induced surface area of these hybrid core-shell structures with isolated nanoclusters on ZnO surface pointed towards the possibility of having better sensitivity as an excellent gas sensing material. The present investigation provided an easy synthetic platform for obtaining high surface area core-shell nanostructures which enhances interfacial compatibility between metal oxide core and metal shell by suitable functionalization for generating better gas sensing materials.

High surface area carbonous components from emulsion derived SiOC and their gas sensing behavior

2015 ◽  
Vol 35 (16) ◽  
pp. 4447-4452 ◽  
Author(s):  
Cekdar Vakifahmetoglu ◽  
Merve Buldu ◽  
Aylin Karakuscu ◽  
Andrea Ponzoni ◽  
Dawit Assefa ◽  
...  
Keyword(s):  
Surface Area ◽  
Gas Sensing ◽  
High Surface ◽  
High Surface Area

scholarly journals Synthesis of Pd-loaded mesoporous SnO2 hollow spheres for highly sensitive and stable methane gas sensors

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24268-24275 ◽  
Author(s):  
Liping Yang ◽  
Zhou Wang ◽  
Xinyuan Zhou ◽  
Xiaofeng Wu ◽  
Ning Han ◽  
...  
Keyword(s):  
Surface Area ◽  
Gas Sensors ◽  
Gas Sensing ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Methane Gas ◽  
Highly Sensitive ◽  
Mesoporous Sno2 ◽  
Sensing Performance

This work reports a simple, rapid, effective and reliable CH4 sensor based on Pd-loaded SnO2 hollow spheres with high surface area and porosity, which is of great importance to gas sensing performance.

Preparation of Polyaniline/Cu-BTC Composite and its Sensing Application for Ammonia

2017 ◽  
Vol 748 ◽  
pp. 353-357
Author(s):  
Yong Jin Zou ◽  
Ying Yin ◽  
Hai Tao Zhang ◽  
Fen Xu ◽  
Li Xian Sun
Keyword(s):  
Surface Area ◽  
Room Temperature ◽  
Gas Sensing ◽  
High Surface ◽  
Hydrothermal Process ◽  
High Surface Area ◽  
High Sensitivity ◽  
Pani Composite ◽  
Sensing Application ◽  
Sensing Performance

In this study, a newly materials based on copper–benzene-1,3,5-tricarboxylate/polyaniline (PANI/Cu-BTC) composite was investigated for NH3 sensing. Cu-BTC was grown on the PANI a hydrothermal process. The sensing performance of as-grown product was studied for different concentrations of NH3 at room temperature. The results reveal that Cu-BTC/PANI composite exhibit high sensitivity toward NH3. The good sensing performance of the composite was attributed to high surface area and good affinity of Cu-BTC for NH3, which can act like preconcentrator for the NH3 gas sensing.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

scholarly journals Rugae-like FeP nanocrystal assembly on a carbon cloth: an exceptionally efficient and stable cathode for hydrogen evolution

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 10974-10981 ◽  
Author(s):  
Xiulin Yang ◽  
Ang-Yu Lu ◽  
Yihan Zhu ◽  
Shixiong Min ◽  
Mohamed Nejib Hedhili ◽  
...  
Keyword(s):  
Gas Phase ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Efficiency ◽  
Carbon Cloth ◽  
Nanocrystal Assembly

High surface area FeP nanosheets on a carbon cloth were prepared by gas phase phosphidation of electroplated FeOOH, which exhibit exceptionally high catalytic efficiency and stability for hydrogen generation.

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