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.

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.

scholarly journals Nanoengineering Approaches Toward Artificial Nose

2021 ◽  
Vol 9 ◽  
Author(s):  
Sanggon Kim ◽  
Jacob Brady ◽  
Faraj Al-Badani ◽  
Sooyoun Yu ◽  
Joseph Hart ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
High Surface ◽  
High Surface Area ◽  
Transition Metal Dichalcogenides ◽  
Sensor Arrays ◽  
Artificial Nose ◽  
Electrical Sensing ◽  
Sensitivity And Selectivity ◽  
Metal Dichalcogenides

Significant scientific efforts have been made to mimic and potentially supersede the mammalian nose using artificial noses based on arrays of individual cross-sensitive gas sensors over the past couple decades. To this end, thousands of research articles have been published regarding the design of gas sensor arrays to function as artificial noses. Nanoengineered materials possessing high surface area for enhanced reaction kinetics and uniquely tunable optical, electronic, and optoelectronic properties have been extensively used as gas sensing materials in single gas sensors and sensor arrays. Therefore, nanoengineered materials address some of the shortcomings in sensitivity and selectivity inherent in microscale and macroscale materials for chemical sensors. In this article, the fundamental gas sensing mechanisms are briefly reviewed for each material class and sensing modality (electrical, optical, optoelectronic), followed by a survey and review of the various strategies for engineering or functionalizing these nanomaterials to improve their gas sensing selectivity, sensitivity and other measures of gas sensing performance. Specifically, one major focus of this review is on nanoscale materials and nanoengineering approaches for semiconducting metal oxides, transition metal dichalcogenides, carbonaceous nanomaterials, conducting polymers, and others as used in single gas sensors or sensor arrays for electrical sensing modality. Additionally, this review discusses the various nano-enabled techniques and materials of optical gas detection modality, including photonic crystals, surface plasmonic sensing, and nanoscale waveguides. Strategies for improving or tuning the sensitivity and selectivity of materials toward different gases are given priority due to the importance of having cross-sensitivity and selectivity toward various analytes in designing an effective artificial nose. Furthermore, optoelectrical sensing, which has to date not served as a common sensing modality, is also reviewed to highlight potential research directions. We close with some perspective on the future development of artificial noses which utilize optical and electrical sensing modalities, with additional focus on the less researched optoelectronic sensing modality.

Hierarchical flowerlike magnesium oxide hollow spheres with extremely high surface area for adsorption and catalysis

2016 ◽  
Vol 4 (2) ◽  
pp. 400-406 ◽  
Author(s):  
Shuliang Yang ◽  
Peipei Huang ◽  
Li Peng ◽  
Changyan Cao ◽  
Yanan Zhu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Surface Area ◽  
Magnesium Oxide ◽  
Heavy Metal Ions ◽  
Catalytic Properties ◽  
Condensation Reaction ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Adsorption Properties

3D hierarchical flowerlike MgO hollow spheres with extremely high surface area showed excellent adsorption properties for heavy metal ions and catalytic properties for the Claisen–Schmidt condensation reaction.

Novel core–shell structured BiVO4 hollow spheres with an ultra-high surface area as visible-light-driven catalyst

CrystEngComm ◽  
2014 ◽  
Vol 16 (27) ◽  
pp. 6059-6065 ◽  
Author(s):  
Yang Lu ◽  
Yong-Song Luo ◽  
Hong-Mei Xiao ◽  
Shao-Yun Fu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Core Shell ◽  
Hydrothermal Route ◽  
Excellent Photocatalytic Activity ◽  
Visible Light Driven

Novel core–shell-structured BiVO4 hollow spheres synthesized via a simple hydrothermal route exhibit an excellent photocatalytic activity.

Plasmonic foam platforms for air quality monitoring

Nanoscale ◽  
2021 ◽  
Author(s):  
I. Brian Becerril-Castro ◽  
Franklin Munoz-Munoz ◽  
Ana B. Castro-Ceseña ◽  
Ana L Gonzalez ◽  
Ramon A Alvarez-Puebla ◽  
...  
Keyword(s):  
Air Quality ◽  
Surface Area ◽  
Gas Sensors ◽  
High Surface ◽  
High Surface Area ◽  
Quality Monitoring ◽  
Indoor Environments ◽  
Air Quality Monitoring

Plasmonic reversible gas sensors are of paramount importance for the monitoring of indoor environments. Herein we design and engineer a plasmonic foam, with a high surface area, confined inside a...

The Synthesis of High-Surface Area Silicon Carbide by Conversion Method Using Carbosilane Polymer

2014 ◽  
Vol 353 ◽  
pp. 244-247
Author(s):  
Eun Jin Jung ◽  
Yoon Joo Lee ◽  
Woo Teck Kwon ◽  
Y. Kim ◽  
Dong Geun Shin ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Mesoporous Silica ◽  
Surface Area ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Bet Analysis ◽  
Fibrous Morphology ◽  
High Surface Area Materials ◽  
Mcm 41

Since mesoporous silica such as MCM-41 and SBA-15 was developed, the study of the properties of high-surface area materials was accelerated. Moreover, the mesoporous silica is used as a template to produce high-surface materials by nanocasting technology. The purpose of this paper is the synthesis of a high surface silicon carbide sphere by the nanocasting technology. In this study, KCC-1 silica sphere was used as a template, and polycarbosilane and poly (phenyl carbosilane) were selected for precursor of silicon carbide. Carbosilane polymer gives advantage of synthesis silicon carbide under low temperature, and hollow spheres were produced. In this study, the polycarbosilane was more effective for the synthesis of SiC hollow spheres by inversion of template structure showing a fibrous morphology on the sphere wall. And it was confirmed that the sphere was composed of nanosized SiC crystals, and has high surface area using TEM, XRD and BET analysis.

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.

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