Silsesquioxane-Based Triphenylamine-Linked Fluorescent Porous Polymer for Dyes Adsorption and Nitro-Aromatics Detection

In order to enrich hybrid materials, a novel fluorescent silsesquioxane-based polymer (denoted as PCS-OTS) was synthesized by Friedel-Crafts reaction starting from octavinylsilsesquioxane (OVS) with triphenylamine-functionalized silsesquioxane monomer (denoted as OTS) with AlCl3 as catalyst. PCS-OTS possessed a high surface area of 816 m2/g and a unique bimodal pore structure. The triphenylamine unit endowed PCS-OTS with excellent luminescence, which made it act as a sensitive chemical sensor and detect p-nitrophenol with high sensitivity (KSV = 81,230 M−1). Moreover, PCS-OTS can significantly remove dyes, and the respective adsorption capacity for Rhodamine B (RB), Congo red (CR) and Methyl Orange (MO) is 1935, 1420 and 155 mg/g. Additionally, it could simultaneously remove multiple dyes from water by simple filtration and be easily regenerated. This hybrid porous polymer can be a good choice for water treatment.

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Solid State Electronic Sensors for Detection of Carbon Dioxide

Sensors ◽

10.3390/s19183848 ◽

2019 ◽

Vol 19 (18) ◽

pp. 3848 ◽

Cited By ~ 2

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.

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

Sensors ◽

10.3390/s19153295 ◽

2019 ◽

Vol 19 (15) ◽

pp. 3295 ◽

Cited By ~ 1

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.

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

Current Graphene Science ◽

10.2174/2452273203666191007143008 ◽

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.

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

MRS Proceedings ◽

10.1557/proc-708-bb10.45 ◽

2001 ◽

Vol 708 ◽

Cited By ~ 6

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.

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Effect of polythiophene thickness on hybrid sensor sensitivity

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2021-0074 ◽

2021 ◽

Vol 60 (1) ◽

pp. 839-845

Author(s):

Samia Belhousse ◽

Fatma-Zohra Tıghılt ◽

Sarah Bennıa ◽

Sarah Adjtoutah ◽

Sabrina Sam ◽

...

Keyword(s):

Room Temperature ◽

Secondary Ion Mass Spectrometry ◽

High Surface ◽

High Surface Area ◽

Conductive Polymer ◽

High Sensitivity ◽

Electrochemical Anodization ◽

Sensing Applications ◽

The Stability ◽

Electrical Characterizations

Abstract In recent years, hybrid structures have attracted wide consideration because they generate new very interesting properties. In this study, a hybrid gas sensor was developed using a simple fabrication process from the combination of porous silicon (PSi) and polythiophene (PTh). The study of the effect of electropolymerization rate and film thickness of PTh on the sensitivity and the stability of sensor was realized at room temperature. PSi was formed by electrochemical anodization, and it is an interesting material for sensing applications due to its high surface area. However, to avoid its degradation and to preserve its properties over the time, PSi surface was functionalized electrochemically with PTh subsequently to thermal oxidation. PTh as a conductive polymer is known for its high sensitivity and stability to environmental change. Several thicknesses of PTh have been electropolymerized onto the oxidized PSi surface to determine the best conditions for developing a sensitive and stable sensor. PTh thickness was controlled by the number of applied voltammogram cyclic. The characterizations of the different elaborated surfaces were carried out by Fourier transform infrared spectroscopy, scanning electron microscopy, cyclic voltammetry, contact angle, and secondary ion mass spectrometry. Finally, we studied the sensitivity, the response time, and the stability of PSi/PTh structures with different PTh thicknesses in the presence of CO2 gas and under cigarette smoke, by performing electrical characterizations, at room temperature.

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Electrical Conductivity Based Ammonia Sensing Properties of Polypyrrole/MoS2 Nanocomposite

Polymers ◽

10.3390/polym12123047 ◽

2020 ◽

Vol 12 (12) ◽

pp. 3047

Author(s):

Sharique Ahmad ◽

Imran Khan ◽

Ahmad Husain ◽

Anish Khan ◽

Abdullah M. Asiri

Keyword(s):

Electron Microscopy ◽

Electrical Conductivity ◽

Active Sites ◽

High Surface ◽

High Surface Area ◽

High Sensitivity ◽

Ambient Air ◽

Sensing Properties ◽

Ammonia Sensing ◽

Transmission Electron

Polypyrrole (PPy) and Polypyrrole/MoS2 (PPy/MoS2) nanocomposites were successfully prepared, characterized and studied for ammonia sensing properties. The as-prepared PPy and PPy/MoS2 nanocomposites were confirmed by FTIR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscopy) and TEM (transmission electron microscopy) techniques. The ammonia sensing properties of PPy and PPy/MoS2 nanocomposites were studied in terms of change in DC electrical conductivity on exposure to ammonia vapors followed by ambient air at room temperature. It was observed that the incorporation of MoS2 in PPy showed high sensitivity, significant stability and excellent reversibility. The enhanced sensing properties of PPy/MoS2 nanocomposites could be attributed to comparatively high surface area, appropriate sensing channels and efficiently available active sites. The sensing mechanism is explained on the basis of simple acid-base chemistry of polypyrrole.

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High surface area porous polymer frameworks: Potential host material for lithium–sulfur batteries

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2015.10.086 ◽

2016 ◽

Vol 657 ◽

pp. 626-630 ◽

Cited By ~ 15

Author(s):

Kui Ding ◽

Qin Liu ◽

Yakun Bu ◽

Kai Meng ◽

WenJing Wang ◽

...

Keyword(s):

Surface Area ◽

High Surface ◽

High Surface Area ◽

Porous Polymer ◽

Host Material ◽

Potential Host ◽

Lithium Sulfur Batteries ◽

Lithium Sulfur

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Crack-free high surface area silica-titania nanocomposite coating as opto-chemical sensor device

Sensors and Actuators A Physical ◽

10.1016/j.sna.2017.12.063 ◽

2018 ◽

Vol 270 ◽

pp. 153-161 ◽

Cited By ~ 6

Author(s):

Shumaila Islam ◽

Hazri Bakhtiar ◽

Noriah Bidin ◽

Ali Aqeel Salim ◽

Saira Riaz ◽

...

Keyword(s):

Surface Area ◽

Chemical Sensor ◽

High Surface ◽

High Surface Area ◽

Nanocomposite Coating ◽

Sensor Device

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Transient laser heating induced hierarchical porous structures from block copolymer–directed self-assembly

Science ◽

10.1126/science.aab0492 ◽

2015 ◽

Vol 349 (6243) ◽

pp. 54-58 ◽

Cited By ~ 79

Author(s):

Kwan Wee Tan ◽

Byungki Jung ◽

Jörg G. Werner ◽

Elizabeth R. Rhoades ◽

Michael O. Thompson ◽

...

Keyword(s):

Pore Size ◽

Surface Area ◽

Self Assembly ◽

Laser Heating ◽

Shape Control ◽

High Surface ◽

Polymer Network ◽

High Surface Area ◽

Porous Polymer ◽

Hierarchical Porous

Development of rapid processes combining hierarchical self-assembly with mesoscopic shape control has remained a challenge. This is particularly true for high-surface-area porous materials essential for applications including separation and detection, catalysis, and energy conversion and storage. We introduce a simple and rapid laser writing method compatible with semiconductor processing technology to control three-dimensionally continuous hierarchically porous polymer network structures and shapes. Combining self-assembly of mixtures of block copolymers and resols with spatially localized transient laser heating enables pore size and pore size distribution control in all-organic and highly conducting inorganic carbon films with variable thickness. The method provides all-laser-controlled pathways to complex high-surface-area structures, including fabrication of microfluidic devices with high-surface-area channels and complex porous crystalline semiconductor nanostructures.

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