Dispersed Nanoelectrodes for High Performance Gas Sensors

2011 ◽  
Vol 1292 ◽  
Author(s):  
Antonio Tricoli ◽  
S.E. Pratsinis
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
Mechanical Stability ◽  
Technological Development ◽  
Electronic Devices ◽  
High Sensitivity ◽  
Effective Length ◽  
Film Resistance ◽  
Nanostructured Layer

ABSTRACTIntegration of nanoparticles in electronic devices such as sensors, actuators, batteries, solar and fuel cells is a key technological development for advancing their performance and miniaturization. Frequently, however, the benefit of nanoscale is lost by poor electrical conductivity through such nanoparticle structures. As a result, it is challenging to achieve both attractive conductivity and maximal performance by the device. Recently it was demonstrated that flame-made nanoparticles can be directly deposited onto substrates to form porous thick films of controlled thickness for application as gas sensors. The mechanical stability of FSP-deposited layers can be greatly increased by in situ annealing showing compatibility even with fragile CMOS-based substrates. Here, a novel asymmetric electrode assembly is described that greatly reduces the resistance of a nanostructured layer and maximizes its performance: Nanoparticles with tailored conductivity (e.g. Ag, CuO, Au) serving as electrodes are stochastically deposited by a scalable technique either below or above a functional (e.g. SnO2, TiO2, WO3) film decreasing the effective length of the resistive components. As the distance between electrodes is at the nanoscale, the total film resistance is drastically decreased. The feasibility of this assembly is demonstrated with solid state sensors having controlled resistance and exceptionally high sensitivity.

scholarly journals A thin, deformable, high-performance supercapacitor implant that can be biodegraded and bioabsorbed within an animal body

2021 ◽  
Vol 7 (2) ◽  
pp. eabe3097
Author(s):  
Hongwei Sheng ◽  
Jingjing Zhou ◽  
Bo Li ◽  
Yuhang He ◽  
Xuetao Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Electronic Devices ◽  
Form Factors ◽  
Time Frame ◽  
Water Soluble ◽  
Two Dimensional ◽  
Medical Electronics ◽  
Thin Structure ◽  
Shed Light

It has been an outstanding challenge to achieve implantable energy modules that are mechanically soft (compatible with soft organs and tissues), have compact form factors, and are biodegradable (present for a desired time frame to power biodegradable, implantable medical electronics). Here, we present a fully biodegradable and bioabsorbable high-performance supercapacitor implant, which is lightweight and has a thin structure, mechanical flexibility, tunable degradation duration, and biocompatibility. The supercapacitor with a high areal capacitance (112.5 mF cm−2 at 1 mA cm−2) and energy density (15.64 μWh cm−2) uses two-dimensional, amorphous molybdenum oxide (MoOx) flakes as electrodes, which are grown in situ on water-soluble Mo foil using a green electrochemical strategy. Biodegradation behaviors and biocompatibility of the associated materials and the supercapacitor implant are systematically studied. Demonstrations of a supercapacitor implant that powers several electronic devices and that is completely degraded after implantation and absorbed in rat body shed light on its potential uses.

Reinforcement of nanostructured reduced graphene oxide: a facile approach to develop high-performance nanocomposite ultrafiltration membranes minimizing the trade-off between flux and selectivity

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 46801-46816 ◽  
Author(s):  
Avishek Pal ◽  
Soumitra Kar ◽  
A. K. Debnath ◽  
D. K. Aswal ◽  
R. C. Bindal ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Mechanical Stability ◽  
Ultrafiltration Membranes ◽  
Trade Off ◽  
Reduced Graphene ◽  
Uf Membranes

In situ impregnation of nanostructured reduced graphene oxide (nRGO) in Ps matrix leads to Ps–nRGO composite UF membranes with promising attributes such as improved flux, optimum selectivity along with reasonable thermal and mechanical stability.

scholarly journals Hierarchical Ni(OH)2/Cu(OH)2 interwoven nanosheets in situ grown on Ni–Cu–P alloy plated cotton fabric for flexible high-performance energy storage

2020 ◽  
Vol 2 (8) ◽  
pp. 3358-3366
Author(s):  
Man Zhou ◽  
Zhihang Jin ◽  
Lifang Su ◽  
Kai Li ◽  
Hong Zhao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Cotton Fabric ◽  
High Performance ◽  
Mechanical Performance ◽  
Electronic Devices ◽  
High Conductivity ◽  
Wearable Electronic ◽  
Wearable Electronic Devices

Flexible Ni(OH)2/Cu(OH)2@Ni–Cu–P alloy coated on cotton fabric with high conductivity and excellent mechanical performance is available for future smart and wearable electronic devices.

Formation of Highly Porous Gas-sensing Films by In-situ Thermophoretic Deposition of Nanoparticles from Aerosol Phase

2006 ◽  
Vol 915 ◽  
Author(s):  
Thorsten Sahm ◽  
Weizhi Rong ◽  
Nicolae Barsan ◽  
Lutz Mädler ◽  
Sheldon K. Friedlander ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Tin Dioxide ◽  
Gas Sensing ◽  
High Sensitivity ◽  
High Catalytic Activity ◽  
Flame Spray ◽  
Ceramic Substrates ◽  
Pd Doping ◽  
Sensor Signals

AbstractGas sensors based on tin dioxide nanoparticles show high sensitivity to reducing and oxidizing gases. Dry aerosol synthesis applying the flame spray pyrolysis was used for manufacture and directly (in-situ) deposit nanoparticles on sensor substrates. For the first time this technique has been used to synthesize a combination of two stacked porous layers for gas sensor fabrication. Compared to state-of-the-art techniques, aerosol technology provides a direct and versatile method to produce homogeneous nanoparticle films. Two different sensing layers were deposited directly on interdigital ceramic substrates. These porous bottom layers consisted either of pure tin dioxide or palladium doped tin dioxide. The top layer was a palladium doped alumina nanoparticle film which served as a chemical filter. The fabricated gas sensors were tested with methane, CO and ethanol. In case of CH4 detection, the pure tin dioxide sensor with the Pd/Al2O3 filter layer showed higher sensor signals and significantly improved analyte selectivity with respect to water vapor compared to single tin dioxide films. At temperatures up to 250°C the Pd-doping of the tin dioxide strongly increased the sensitivity to all gases. At higher temperatures the sensor signal significantly decreased for the Pd/SnO2 sensor with a Pd/Al2O3 filter on top indicating high catalytic activity.

Vertical SnO2 nanosheet@SiC nanofibers with hierarchical architecture for high-performance gas sensors

2016 ◽  
Vol 4 (2) ◽  
pp. 295-304 ◽  
Author(s):  
Bing Wang ◽  
Yingde Wang ◽  
Yongpeng Lei ◽  
Song Xie ◽  
Nan Wu ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Sensors ◽  
High Performance ◽  
High Sensitivity ◽  
Hierarchical Architecture ◽  
Long Term Stability ◽  
Response Recovery ◽  
Sno2 Nanosheet ◽  
Excellent Reproducibility

The SnO2 NS@SiC NF sensor shows an ultrafast response/recovery rate, high sensitivity, excellent reproducibility, good sensing selectivity and outstanding long-term stability toward ethanol, even at high temperature.

scholarly journals On-chip assembly of 3D graphene-based aerogels for chemiresistive gas sensing

2020 ◽  
Vol 56 (3) ◽  
pp. 450-453 ◽  
Author(s):  
Gaofeng Shao ◽  
Oleksandr Ovsianytskyi ◽  
Maged F. Bekheet ◽  
Aleksander Gurlo
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
Gas Sensing ◽  
3D Graphene ◽  
On Chip

The first demonstration of the in situ assembly of 3D graphene-based aerogels on a chip as high performance gas sensors towards trace NO2.

scholarly journals Ladder-type sulfonated poly(arylene perfluoroalkylene)s for high performance proton exchange membrane fuel cells

RSC Advances ◽  
2020 ◽  
Vol 10 (67) ◽  
pp. 41058-41064
Author(s):  
Zhi Long ◽  
Junpei Miyake ◽  
Kenji Miyatake
Keyword(s):  
Fuel Cell ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
Mechanical Stability ◽  
Proton Exchange ◽  
Easy Method ◽  
Fuel Cell Performance ◽  
Exchange Membrane ◽  
Sulfonated Poly

Sulfone-bonded ladder-type sulfonated poly(arylene perfluoroalkylene)s (SPAF-P-Lad) were synthesized by an easy method to achieve high thermo-mechanical stability, proton conductivity, fuel cell performance and remarkable in situ durability.

In situ synergistic crystallization-induced synthesis of novel Au nanostar-encrusted ZnO mesocrystals with high-quality heterojunctions for high-performance gas sensors

2015 ◽  
Vol 3 (19) ◽  
pp. 10209-10218 ◽  
Author(s):  
Lianhai Zu ◽  
Yao Qin ◽  
Jinhu Yang
Keyword(s):  
Gas Sensors ◽  
High Performance ◽  
High Quality ◽  
One Pot ◽  
Sensing Performance

Novel strawberry-like Au nanostar-encrusted ZnO mesocrystals have been synthesized through a one-pot additive-free strategy with extraordinary sensing performance towards H2S.

scholarly journals Organic Heterojunction Devices Based on Phthalocyanines: A New Approach to Gas Chemosensing

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4700 ◽  
Author(s):  
Abhishek Kumar ◽  
Rita Meunier-Prest ◽  
Marcel Bouvet
Keyword(s):  
Gas Sensors ◽  
Field Effect ◽  
High Performance ◽  
Structural Engineering ◽  
High Sensitivity ◽  
Signal Stability ◽  
Highly Sensitive ◽  
Environmental Guidelines ◽  
Ultrahigh Sensitivity ◽  
Molecular Semiconductor

Organic heterostructures have emerged as highly promising transducers to realize high performance gas sensors. The key reason for such a huge interest in these devices is the associated organic heterojunction effect in which opposite free charges are accumulated at the interface making it highly conducting, which can be exploited in producing highly sensitive and faster response kinetics gas sensors. Metal phthalocyanines (MPc) have been extensively studied to fabricate organic heterostructures because of the large possibilities of structural engineering which are correlated with their bulk thin film properties. Accordingly, in this review, we have performed a comprehensive literature survey of the recent researches reported about MPc based organic heterostructures and their application in gas sensors. These heterostructures were used in Organic Field-Effect Transistor and Molecular Semiconductor—Doped Insulator sensing device configurations, in which change in their electrical properties such as field-effect mobility and saturation current in the former and current at a fixed bias in the latter under redox gases exposure were assessed to determine the chemosensing performances. These sensing devices have shown very high sensitivity to redox gases like nitrogen dioxide (NO2), ozone and ammonia (NH3), which monitoring is indispensable for implementing environmental guidelines. Some of these sensors exhibited ultrahigh sensitivity to NH3 demonstrated by a detection limit of 140 ppb and excellent signal stability under variable humidity, making them among the best NH3 sensors.

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