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  1. Article: Plasmonic Enhanced SERS in Ag/TiO

    Awada, Chawki

    Micromachines

    2022  Volume 13, Issue 10

    Abstract: In this work, we present a new study on the electromagnetic (EM) enhancement properties generated by Ag/ ... ...

    Abstract In this work, we present a new study on the electromagnetic (EM) enhancement properties generated by Ag/TiO
    Language English
    Publishing date 2022-09-25
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi13101595
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Effect of pH and Nanoparticle Capping Agents on Cr (III) Monitoring in Water: A Kinetic Way to Control the Parameters of Ultrasensitive Environmental Detectors.

    Awada, Chawki / Traboulsi, Hassan

    Micromachines

    2020  Volume 11, Issue 12

    Abstract: In this work, we apply surface-enhanced Raman spectroscopy (SERS) to study the kinetics of chromium Cr (III) detection in solution using EDTA and silver nanoparticles (AgNPs). We examine for the first time the effect of pH and nanoparticles' capping ... ...

    Abstract In this work, we apply surface-enhanced Raman spectroscopy (SERS) to study the kinetics of chromium Cr (III) detection in solution using EDTA and silver nanoparticles (AgNPs). We examine for the first time the effect of pH and nanoparticles' capping agent on the kinetic mechanism of Cr (III) detection using SERS temporal variations. The full width at half maximum (FWHM) and Raman shift variations show that the mechanism of detection is composed of two steps: a first one consisting of chemical coordination between Cr (III) and AgNPs that leads to exalted chemical and electromagnetic enhancement and the second one is an aggregation process with an important optical enhancement. The obtained results showed that the first step in the detection at lower pH was five times faster than in a basic medium using citrate capped silver nanoparticles (Cit-AgNPs). On the other hand, using a capping agent with dicarboxylate groups such as oxalate (Oxa-AgNPs) led to an important enhancement in SERS detection signal (more than 30 times) compared with Cit-AgNPs, although the detection kinetic's mechanism was slower.
    Language English
    Publishing date 2020-11-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2620864-7
    ISSN 2072-666X
    ISSN 2072-666X
    DOI 10.3390/mi11121045
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Toward the Development of Ultrasensitive Detectors for Environmental Applications: A Kinetic Study of Cr(III) Monitoring in Water Using EDTA and SERS Techniques.

    Traboulsi, Hassan / Awada, Chawki

    ACS omega

    2020  Volume 5, Issue 48, Page(s) 31352–31361

    Abstract: We report for the first time kinetic studies on chromium(III) detection in aqueous solution using citrate-capped silver nanoparticles (AgNPs) and the surface-enhanced Raman spectroscopy (SERS) technique. Moreover, we have shown an important effect of ... ...

    Abstract We report for the first time kinetic studies on chromium(III) detection in aqueous solution using citrate-capped silver nanoparticles (AgNPs) and the surface-enhanced Raman spectroscopy (SERS) technique. Moreover, we have shown an important effect of adding ethylenediaminetetraacetic acid (EDTA) on the enhancement and the stability of the Raman signal. The origin of the SERS signal was attributed to the coordination of Cr(III) by citrate/EDTA molecules and the formation of hot spots on aggregated AgNPs. Depending on the mixing method of Cr(III) and EDTA with AgNPs, the temporal SERS spectral features reveal a Prout-Tompkins or a Langmuir kinetic detection model. The UV-visible data, the temporal response of the Raman signal, and the scanning electron microscopy analysis have allowed us to elucidate the mechanism of Cr(III) detection. We observed that mixing simultaneously Cr(III), AgNPs, and EDTA leads to the most stable and intense time-dependent SERS signal. The obtained results should open the way to perform kinetic studies on different host-guest interactions in solution using the SERS technique.
    Language English
    Publishing date 2020-11-23
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.0c04844
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Effect of Mg on the Structural, Optical and Thermoluminescence Properties of Li

    Alshoaibi, Adil / Ike, Patrick O / Nwanya, Assumpta C / Awada, Chawki / Islam, Shumila / Ezema, Fabian I

    Molecules (Basel, Switzerland)

    2023  Volume 28, Issue 2

    Abstract: The doping of magnesium on lithium aluminium borate phosphor is reported in this study. A solid-state sintering technique was employed as the borate samples were synthesized. This report focuses on the structural, optical, thermoluminescence, and kinetic ...

    Abstract The doping of magnesium on lithium aluminium borate phosphor is reported in this study. A solid-state sintering technique was employed as the borate samples were synthesized. This report focuses on the structural, optical, thermoluminescence, and kinetic analyses of the main glow peak. The structural properties of lithium aluminium borates improved due to the magnesium dopants used. Differences in the crystallite size and particle size were 38.85-67.35 nm and 50-60 nm, respectively, and these results were obtained from the analyzed X-ray diffractogram and scanning electron spectroscopy. The energy band gaps obtained from the direct transition of borate phosphor materials were within the range of 3.00-4.40 eV, and the doped samples gave a higher energy band gap. A decrease in the TGA (%) exhibited a weight loss or water loss for the undoped, 0.1% Mg, and 0.3% Mg-doped lithium aluminium borate materials. The glow curve measured at a heat rate of 1 °C·s
    Language English
    Publishing date 2023-01-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules28020504
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  5. Article ; Online: Combining second harmonic generation and multiphoton excited photo-luminescence to investigate TiO

    Jonin, Christian / Salmon, Estelle / Ahmed, Faheem / Kanoun, Mohammed Benali / Awada, Chawki / Brevet, Pierre-Francois

    Physical chemistry chemical physics : PCCP

    2023  Volume 25, Issue 26, Page(s) 17281–17286

    Abstract: Disentangling Second Harmonic Generation (SHG) and Multiphoton Excited Photoluminescence (MEPL) signals in microscopy experiments is not an easy task. Two methods have been so far proposed based either on a time domain or a spectral domain analysis of ... ...

    Abstract Disentangling Second Harmonic Generation (SHG) and Multiphoton Excited Photoluminescence (MEPL) signals in microscopy experiments is not an easy task. Two methods have been so far proposed based either on a time domain or a spectral domain analysis of the collected signals. In this report, a new method based on polarization discrimination is proposed to separate these SHG and MEPL contributions. In order to demonstrate this operation, intensity depth profiles are recorded for an anatase titanium dioxide powder consisting of 22 nm diameter nanoparticles using ultrafast femtosecond laser excitation. Polarization analysis of these intensity depth profiles is therefore performed and demonstrates a polarization angle shift for the SHG intensity contribution as compared to the MEPL one, allowing for the discrimination of the two SHG and MEPL contributions. The fundamental beam is set at two different wavelengths in order to provide a SHG photon energy above and below the anatase TiO
    Language English
    Publishing date 2023-07-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d3cp02113k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Flower-Like ZnO Nanorods Synthesized by Microwave-Assisted One-Pot Method for Detecting Reducing Gases: Structural Properties and Sensing Reversibility.

    Aljaafari, Abdullah / Ahmed, Faheem / Awada, Chawki / Shaalan, Nagih M

    Frontiers in chemistry

    2020  Volume 8, Page(s) 456

    Abstract: In this work, flower-like ZnO nanorods (NRs) were successfully prepared using microwave-assisted techniques at a low temperature. The synthesized NRs exhibited a smooth surface and good crystal structure phase of ZnO. The sharp peak of the XRD and Raman ... ...

    Abstract In this work, flower-like ZnO nanorods (NRs) were successfully prepared using microwave-assisted techniques at a low temperature. The synthesized NRs exhibited a smooth surface and good crystal structure phase of ZnO. The sharp peak of the XRD and Raman spectrum confirmed the high crystallinity of these ZnO NRs with a pure wurtzite structure. The nanorods were ~2 μm in length and ~150 nm in diameter, respectively. The electron diffraction pattern confirmed that the single crystal ZnO nanorods aligned along the [001] plane. The NRs were applied to fabricate a gas sensor for reducing gases such as CH
    Language English
    Publishing date 2020-07-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2711776-5
    ISSN 2296-2646
    ISSN 2296-2646
    DOI 10.3389/fchem.2020.00456
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  7. Article ; Online: SARS-CoV-2 Receptor Binding Domain as a Stable-Potential Target for SARS-CoV-2 Detection by Surface-Enhanced Raman Spectroscopy.

    Awada, Chawki / Abdullah, Mohammed Mahfoudh Ba / Traboulsi, Hassan / Dab, Chahinez / Alshoaibi, Adil

    Sensors (Basel, Switzerland)

    2021  Volume 21, Issue 13

    Abstract: In this work, we report a new approach for detecting SARS-CoV-2 RBD protein (RBD) using the surface-enhanced Raman spectroscopy (SERS) technique. The optical enhancement was obtained thanks to the preparation of nanostructured Ag/Au substrates. ... ...

    Abstract In this work, we report a new approach for detecting SARS-CoV-2 RBD protein (RBD) using the surface-enhanced Raman spectroscopy (SERS) technique. The optical enhancement was obtained thanks to the preparation of nanostructured Ag/Au substrates. Fabricated Au/Ag nanostructures were used in the SERS experiment for RBD protein detection. SERS substrates show higher capabilities and sensitivity to detect RBD protein in a short time (3 s) and with very low power. We were able to push the detection limit of proteins to a single protein detection level of 1 pM. The latter is equivalent to 1 fM as a detection limit of viruses. Additionally, we have shown that the SERS technique was useful to figure out the presence of RBD protein on antibody functionalized substrates. In this case, the SERS detection was based on protein-antibody recognition, which led to shifts in the Raman peaks and allowed signal discrimination between RBD and other targets such as Bovine serum albumin (BSA) protein. A perfect agreement between a 3D simulated model based on finite element method and experiment was reported confirming the SERS frequency shift potential for trace proteins detection. Our results could open the way to develop a new prototype based on SERS sensitivity and selectivity for rapid detection at a very low concentration of virus and even at a single protein level.
    MeSH term(s) Animals ; COVID-19 ; Cattle ; Gold ; Humans ; Metal Nanoparticles ; Nanostructures ; SARS-CoV-2 ; Serum Albumin, Bovine ; Spectrum Analysis, Raman
    Chemical Substances Serum Albumin, Bovine (27432CM55Q) ; Gold (7440-57-5)
    Language English
    Publishing date 2021-07-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s21134617
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Correction to 'Photocatalytic inactivation of

    Ahmed, Faheem / Awada, Chawki / Ansari, Sajid Ali / Aljaafari, Abdullah / Alshoaibi, Adil

    Royal Society open science

    2020  Volume 7, Issue 1, Page(s) 192176

    Abstract: This corrects the article DOI: 10.1098/rsos.191444.]. ...

    Abstract [This corrects the article DOI: 10.1098/rsos.191444.].
    Language English
    Publishing date 2020-01-22
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2787755-3
    ISSN 2054-5703
    ISSN 2054-5703
    DOI 10.1098/rsos.192176
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Photocatalytic inactivation of

    Ahmed, Faheem / Awada, Chawki / Ansari, Sajid Ali / Aljaafari, Abdullah / Alshoaibi, Adil

    Royal Society open science

    2019  Volume 6, Issue 12, Page(s) 191444

    Abstract: In this study, high specific surface areas (SSAs) of anatase titanium dioxide ( ... ...

    Abstract In this study, high specific surface areas (SSAs) of anatase titanium dioxide (TiO
    Language English
    Publishing date 2019-12-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 2787755-3
    ISSN 2054-5703
    ISSN 2054-5703
    DOI 10.1098/rsos.191444
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  10. Article: Synthesis and Studies of Electro-Deposited Yttrium Arsenic Selenide Nanofilms for Opto-Electronic Applications.

    Awada, Chawki / Whyte, Goodfriend M / Offor, Peter O / Whyte, Favour G / Kanoun, Mohammed Benali / Goumri-Said, Souraya / Alshoaibi, Adil / Ekwealor, Azubice B C / Maaza, Malik / Ezema, Fabian I

    Nanomaterials (Basel, Switzerland)

    2020  Volume 10, Issue 8

    Abstract: Nanocomposite films grown by incorporating varying concentrations of Yttrium, a d-block rare-earth ion, into the binary chalcogenide Arsenic selenide host matrix is here presented. Films were grown via the wet-chemical electro-deposition technique and ... ...

    Abstract Nanocomposite films grown by incorporating varying concentrations of Yttrium, a d-block rare-earth ion, into the binary chalcogenide Arsenic selenide host matrix is here presented. Films were grown via the wet-chemical electro-deposition technique and characterized for structural, optical, surface morphology, and photoluminescence (PL) properties. The X-ray Diffraction (XRD) result of the host matrix (pristine film) showed films of monoclinic structure with an average grain size of 36.2 nm. The composite films, on the other hand, had both cubic YAs and tetragonal YSe structures with average size within 36.5-46.8 nm. The fairly homogeneous nano-sized films are shown by the Scanning Electron Microscopy (SEM) micrographs while the two phases of the composite films present in the XRD patterns were confirmed by the Raman shifts due to the cleavage of the As-Se host matrix and formation of new structural units. The refractive index peaked at 2.63 within 350-600 nm. The bandgap energy lies in the range of 3.84-3.95 eV with a slight decrease with increasing Y addition; while the PL spectra depict emission bands across the Vis-NIR spectral regions. Theoretically, the density functional theory (DFT) simulations provided insight into the changes induced in the structure, bonding, and electronic properties. Besides reducing the bandgap of the As
    Language English
    Publishing date 2020-08-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano10081557
    Database MEDical Literature Analysis and Retrieval System OnLINE

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