scholarly journals Solid State Electronic Sensors for Detection of Carbon Dioxide

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3848 ◽  
Author(s):  
Ami Hannon ◽  
Jing Li
Keyword(s):  
Carbon Dioxide ◽  
Iron Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Multiwall Carbon Nanotubes ◽  
High Sensitivity ◽  
Space Applications ◽  
Detection Range ◽  
Ultra Low Power ◽  
Compact Size

Detection of carbon dioxide (CO2) is very important for environmental, health, safety and space applications. We have studied novel multiwall carbon nanotubes (MWCNTs) and an iron oxide (Fe2O3) nanocomposite based chemiresistive sensor for detection of CO2 at room temperature. The sensor has been miniaturized to a chip size (1 cm × 2 cm). Good sensing performance was observed with a wide detection range of CO2 concentrations (100–6000 ppm). Structural properties of the sensing materials were characterized using Field-Emission Scanning Electron Microscopy, Fourier-Transform Infrared and Raman spectroscopies. The greatly improved sensitivity of the composite materials to CO2 can be attributed to the formation of a depletion layer at the p-n junction in an MWCNT/iron oxide heterostructure, and new CO2 gas molecules adhere to the high surface area of MWCNTs due to the concentration gradient. The test results showed that the CO2 sensor possesses fast response, compact size, ultra-low power consumption, high sensitivity and wide dynamic detection range.

scholarly journals Developing Eco-Friendly and Cost-Effective Porous Adsorbent for Carbon Dioxide Capture

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1962
Author(s):  
Mahboubeh Nabavinia ◽  
Baishali Kanjilal ◽  
Noahiro Fujinuma ◽  
Amos Mugweru ◽  
Iman Noshadi
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Co2 Capture ◽  
High Surface ◽  
Scale Up ◽  
Polymer Networks ◽  
High Surface Area ◽  
Excellent Thermal Stability ◽  
Doped Polymers ◽  
Metal Doped

To address the issue of global warming and climate change issues, recent research efforts have highlighted opportunities for capturing and electrochemically converting carbon dioxide (CO2). Despite metal doped polymers receiving widespread attention in this respect, the structures hitherto reported lack in ease of synthesis with scale up feasibility. In this study, a series of mesoporous metal-doped polymers (MRFs) with tunable metal functionality and hierarchical porosity were successfully synthesized using a one-step copolymerization of resorcinol and formaldehyde with Polyethyleneimine (PEI) under solvothermal conditions. The effect of PEI and metal doping concentrations were observed on physical properties and adsorption results. The results confirmed the role of PEI on the mesoporosity of the polymer networks and high surface area in addition to enhanced CO2 capture capacity. The resulting Cobalt doped material shows excellent thermal stability and promising CO2 capture performance, with equilibrium adsorption of 2.3 mmol CO2/g at 0 °C and 1 bar for at a surface area 675.62 m2/g. This mesoporous polymer, with its ease of synthesis is a promising candidate for promising for CO2 capture and possible subsequent electrochemical conversion.

Construction and carbon dioxide capture of microporous polymer networks with high surface area based on cross-linkable linear polyimides

2019 ◽  
Vol 10 (33) ◽  
pp. 4611-4620 ◽  
Author(s):  
Ningning Song ◽  
Tianjiao Wang ◽  
Hongyan Yao ◽  
Tengning Ma ◽  
Kaixiang Shi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Carbon Dioxide Capture ◽  
High Surface ◽  
Polymer Networks ◽  
High Surface Area ◽  
Crosslinking Reaction ◽  
Adsorption Performance ◽  
Microporous Polymer

Microporous polyimide networks with high surface area and excellent CO2 adsorption performance have been constructed based on cross-linkable linear polyimides through crosslinking reaction.

scholarly journals An Efficient Electrochemical Sensor Driven by Hierarchical Hetero-Nanostructures Consisting of RuO2 Nanorods on WO3 Nanofibers for Detecting Biologically Relevant Molecules

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3295 ◽  
Author(s):  
Hyerim Lee ◽  
Yeomin Kim ◽  
Areum Yu ◽  
Dasol Jin ◽  
Ara Jo ◽  
...  
Keyword(s):  
Tungsten Trioxide ◽  
High Surface ◽  
High Surface Area ◽  
High Sensitivity ◽  
Annealing Process ◽  
Electrochemical Sensing ◽  
Biologically Relevant ◽  
Sensing Platform ◽  
Thermal Annealing Process ◽  
Biologically Relevant Molecules

By means of electrospinning with the thermal annealing process, we investigate a highly efficient sensing platform driven by a hierarchical hetero-nanostructure for the sensitive detection of biologically relevant molecules, consisting of single crystalline ruthenium dioxide nanorods (RuO2 NRs) directly grown on the surface of electrospun tungsten trioxide nanofibers (WO3 NFs). Electrochemical measurements reveal the enhanced electron transfer kinetics at the prepared RuO2 NRs-WO3 NFs hetero-nanostructures due to the incorporation of conductive RuO2 NRs nanostructures with a high surface area, resulting in improved relevant electrochemical sensing performances for detecting H2O2 and L-ascorbic acid with high sensitivity.

Graphene-based Nanomaterials for Fabrication of ‘Pesticide’ Electrochemical Sensors

2020 ◽  
Vol 3 (1) ◽  
pp. 26-40
Author(s):  
Manorama Singh ◽  
Smita R. Bhardiya ◽  
Fooleswar Verma ◽  
Vijai K. Rai ◽  
Ankita Rai
Keyword(s):  
Electrochemical Sensors ◽  
Hybrid Composites ◽  
High Surface ◽  
High Surface Area ◽  
High Sensitivity ◽  
Sensor Technology ◽  
Hybrid Functional ◽  
Suitable Material ◽  
Functional Composites

At present, graphene is one of the most up-to-date materials and it can be applied for various energy conversion devices and sensor technology. In this review article, our main focus is to summarize the role of graphene and its modified surface leading to develop hybrid nanomaterials and its applications in fabrication of pesticide sensor. Graphene based materials demonstrate exclusive electrochemical and optical properties as well as compatibility to absorb a variety of bio-molecules through π-π stacking interaction and/or electrostatics interaction, which make them ideal material to be employed in sensor application. The role of graphene is very crucial in preparing different unique and desirable hybrid functional composites along with nanoparticles, redox mediators, conducting polymers etc. to improve the performance of the sensors. Therefore, they can be easily used as a suitable material applying in fabrication of electrochemical sensors/ biosensors for the detection of organophosphorous and carbamate pesticides. A number of most recent reported works were discussed in which graphene-based hybrid composites show high sensitivity, good catalytic activity, selectivity towards the determination of pesticide either enzymatically or nonenzymatically. The properties of graphene (exceptional charge transport, thermal, optical, mechanical, high surface area, large pore volume and size, an opened ordered structure) play an important role in pesticide detection.

Rapid preparation of high surface area iron oxide and alumina nanoclusters through a soft templating approach of sol–gel precursors

2013 ◽  
Vol 37 (1) ◽  
pp. 245-249 ◽  
Author(s):  
Fernando Hung-Low ◽  
Geneva R. Peterson ◽  
Marauo Davis ◽  
Louisa J. Hope-Weeks
Keyword(s):  
Iron Oxide ◽  
Surface Area ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Rapid Preparation ◽  
Soft Templating

Design, Synthesis and Electrospinning of a Novel Fluorescent Polymer for Optical Sensor Applications

2001 ◽  
Vol 708 ◽  
Author(s):  
Soo-Hyoung Lee ◽  
Bon-Cheol Ku ◽  
X. Wang ◽  
L.A. Samuelson ◽  
J. Kumar
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
High Sensitivity ◽  
Coupling Reactions ◽  
Methacryloyl Chloride ◽  
Design Synthesis ◽  
Sensor Applications ◽  
Fluorescent Polymers ◽  
Optical Chemical Sensors ◽  
Bimolecular Quenching

ABSTRACTThis work describes the synthesis and electrospinning of new fluorescent polymers and their use for the fabrication of optical chemical sensors. A new fluorescent monomer was first synthesized by coupling reactions between methacryloyl chloride and a pyrene derivative, 1-pyrene butanol. Fluorescent polymers containing pyrene molecules were then obtained by the copolymerization of this monomer with methylmethacrylate using 2,2'-azobisisobutyronitrile as the initiator. These polymers show distinct and well-defined fluorescence that is characteristic of the pyrene chromophores. Electrospinning was used to process these polymers into high surface area nanofibrous membranes for optical sensing. The resulting membranes show a high sensitivity to 2,4-dinitro toluene based on the fluorescence quenching of the pyrene chromophores. Fluorescence intensities decreased with increasing concentration of the 2,4-dinitro toluene. The quenching behavior follows Stern-Volmer bimolecular quenching kinetics. The synthesis, characterization, electrospinning fabrication, and sensing capability of these polymers will be discussed.

One-Step Synthesis of Nano-Size Iron Oxide /Three-Dimensional Wormlike Hierarchical Mesoporous SiO2 Catalysts and its Catalytic Performance on Phenol Hydroxylation

2013 ◽  
Vol 662 ◽  
pp. 202-206
Author(s):  
Jia Feng Wu ◽  
Yu Mei Zhao ◽  
Peng Liang
Keyword(s):  
Iron Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Catalytic Performance ◽  
Phenol Hydroxylation ◽  
Weight Percentage ◽  
One Step ◽  
Hierarchical Pore ◽  
Nano Size

A series of nano-sized iron oxide supported on 3D wormlike hierarchical mesoporous SiO2 catalysts were synthesized by one-step hydrothermal synthesis. The samples were characterized by XRD, N2 sorption, FT-IR, UV–Vis, TEM and ICP-AES. The catalysts were probed for the oxidation of phenol employing hydrogen peroxide. The results indicate that the materials exhibit high surface area and 3D wormlike hierarchical pore, iron ions exist as isolated framework species when the weight percentage content of iron is below 0.24 and nano-size iron oxide is dispersed in the surface (iron content above 0.24 wt%). Catalytic performance indicates that nano-size iron oxide supported on SiO2 is useful to enhance both the catalytic activity and the selectivity of target products compared with isolated iron species.

High surface area solids obtained by intercalation of iron oxide pillars in montmorillonite

1984 ◽  
Vol 19 (2) ◽  
pp. 161-168 ◽  
Author(s):  
Shoji Yamanaka ◽  
Tadahiro DOI ◽  
Shuji Sako ◽  
Makoto Hattori
Keyword(s):  
Iron Oxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area
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