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

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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Metal nanoparticles: ligand free approach towards coupling reactions

Current Chinese Science ◽

10.2174/2210298101666210922144232 ◽

2021 ◽

Vol 01 ◽

Author(s):

Sharwari K. Mengane ◽

Ronghui Wu ◽

Liyun Ma ◽

Chhaya S. Panse ◽

Shailesh N. Vajekar ◽

...

Keyword(s):

Heterogeneous Catalysis ◽

Metal Nanoparticles ◽

Surface Area ◽

Heterogeneous Catalysts ◽

High Surface ◽

High Surface Area ◽

Reaction Medium ◽

Coupling Reactions ◽

Research Activities ◽

Ligand Free

: Catalysis is the multidisciplinary field involving many areas of chemistry, notably in organometallic chemistry and materials science. It has great applications in synthesis of many industrially applicable compounds such as fuels and fine chemicals. The activity and selectivity are a key issue in catalysis that generally allied to high surface area. The current research activities mainly deal with the homogeneous and heterogeneous catalysis. Homogeneous and heterogeneous catalysis have certain drawbacks which restricts their application to great extent but have their own advantages. Hence, it has a predominant concern of current research to find out an alternate to overcome their drawbacks. Therefore, it is highly desirable to find a catalytic protocol that offers high selectivity and excellent product yield with quick and easy recovery. Along with their various applications as alternatives to conventional bulk materials nanomaterial have established its great role in different industrial and scientific applications. Nanocatalysis has emerged as new alternative to the conventional homogeneous and heterogeneous catalysis. The nanomaterials are responsible to enhance surface area of the catalyst, which ultimately increases the catalyst reactants contacts. In addition, it acts as robust material and has high surface area like heterogeneous catalysts. Insolubility of such nanomaterial in reaction medium makes them easily separable, hence, catalyst can be easily separate from the product. Hence, it has been proven that nanocatalysts behave like homogeneous as well as heterogeneous catalysts which work as a bridge between the conventional catalytic systems. Considering these merits; researchers has paid their attention towards applications of nanocatalyst in several organic reactions. This review article focused on the catalytic applications of metal nanoparticles (MNPs) such as Pd, Ag, Au, Cu, Pt in ligand free coupling reactions. In addition, it covers applications of bimetallic and multimetallic nanoparticles in ligand free coupling reactions.

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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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High-Surface-Area Catalyst Design: Synthesis, Characterization, and Reaction Studies of Platinum Nanoparticles in Mesoporous SBA-15 Silica†

The Journal of Physical Chemistry B ◽

10.1021/jp048867x ◽

2005 ◽

Vol 109 (6) ◽

pp. 2192-2202 ◽

Cited By ~ 405

Author(s):

R. M. Rioux ◽

H. Song ◽

J. D. Hoefelmeyer ◽

P. Yang ◽

G. A. Somorjai

Keyword(s):

Surface Area ◽

Platinum Nanoparticles ◽

High Surface ◽

High Surface Area ◽

Catalyst Design ◽

Design Synthesis

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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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Design and Synthesis of Nanostructured Materials for Sensor Applications

Journal of Nanomaterials ◽

10.1155/2020/8855321 ◽

2020 ◽

Vol 2020 ◽

pp. 1-20

Author(s):

Naumih M. Noah

Keyword(s):

Carbon Nanotubes ◽

Nanostructured Materials ◽

Low Cost ◽

Metal Oxide Nanoparticles ◽

High Surface ◽

High Surface Area ◽

Detection Sensitivity ◽

High Electron ◽

Sensor Applications ◽

Metal Metal

There has been an increasing demand for the development of sensor devices with improved characteristics such as sensitivity, low cost, faster response, reliability, rapider recovery, reduced size, in situ analysis, and simple operation. Nanostructured materials have shown great potential in improving these properties for chemical and biological sensors. There are different nanostructured materials which have been used in manufacturing nanosensors which include nanoscale wires (capability of high detection sensitivity), carbon nanotubes (very high surface area and high electron conductivity), thin films, metal and metal oxide nanoparticles, polymer, and biomaterials. This review provides different methods which have been used in the synthesis and fabrication of these nanostructured materials followed by an extensive review of the recent developments of metal, metal oxides, carbon nanotubes, and polymer nanostructured materials in sensor applications.

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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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Copper nanoparticle anchored biguanidine-modified Zr-UiO-66 MOFs: a competent heterogeneous and reusable nanocatalyst in Buchwald–Hartwig and Ullmann type coupling reactions

RSC Advances ◽

10.1039/d1ra02634h ◽

2021 ◽

Vol 11 (36) ◽

pp. 22278-22286

Author(s):

Hojat Veisi ◽

Narges Neyestani ◽

Mozhgan Pirhayati ◽

Sheida Ahany Kamangar ◽

Shahram Lotfi ◽

...

Keyword(s):

Surface Area ◽

Metal Organic Framework ◽

High Surface ◽

High Surface Area ◽

Coupling Reactions ◽

Copper Nanoparticle ◽

Cu Nanoparticles ◽

Polymeric Structure ◽

Metal Organic ◽

Type Coupling

We have designed a functionalized metal–organic framework (MOF) of UiO topology as a support, with an extremely high surface area, adjustable pore sizes and stable crystalline coordination polymeric structure and implanted copper (Cu) nanoparticles thereon.

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