Article
Chemistry, Multidisciplinary
Ruttapol Malatong, Takuro Sato, Jakkapan Kumsampao, Taketoshi Minato, Masayuki Suda, Vinich Promarak, Hiroshi M. Yamamoto
Summary: This study addresses the challenges of spin controllability, durability, and spin-polarization efficiency in chiral-induced spin selectivity (CISS) by developing a self-assembled monolayer (SAM) of overcrowded alkene (OCA)-based molecular motor. It is demonstrated that the direction of spin polarization can be externally and repeatedly manipulated by switching the molecular chirality, and a higher stereo-ordering architecture of the SAM of OCAs enhances the efficiency of spin polarization. These findings provide a credible feasibility study for the development of CISS-based spintronic devices.
Article
Chemistry, Inorganic & Nuclear
Samir Chattopadhyay, Sabyasachi Bandyopadhyay, Abhishek Dey
Summary: The study investigates the long-range electron transfer (ET) process across several SAM-covered Au electrodes to covalently attached ferrocene, showing a significant kinetic isotope effect (KIE) that shifts substantially upon deuteration of thiols.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Analytical
Cheryl Suwen Law, Juan Wang, Satyathiran Gunenthiran, Siew Yee Lim, Andrew D. Abell, Lutz Ahrens, Tushar Kumeria, Abel Santos, Nicolas H. Voelcker
Summary: This study presents an optical system for real-time, label-free detection of per- and polyfluoroalkyl substances (PFASs). By analyzing key sensing parameters, the researchers determined the optimal molecular length for maximizing sensitivity and selectivity to PFAS. The study also provides insights into the formation mechanism of PFAS self-assembled monolayers, and demonstrates the potential real-life applicability of the system.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Nanoscience & Nanotechnology
Yangbiao Liu, Egbert Zojer, Michael Zharnikov
Summary: Self-assembled monolayers (SAMs) of ferrocene-substituted thiofluorene on Au(111) exhibit two distinct conductance states (CSs) with high rectification ratio (RR). The CSs and RR depend on the bias voltage sweep direction, with the high CS preserved under negative bias and switched to low CS under positive bias. In symmetric sweeps, the CS depends on the polarity of the first sweep.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Electrochemistry
Yue Wang, Imgon Hwang, Zhenni Wu, Patrik Schmuki
Summary: By decorating TiO2 surfaces with a partial coverage of headgroups of silane self-assembled monolayers (SAMs) and then depositing Pt SAs on this SAM modified surface, a significantly enhanced photocatalytic activity for H-2 generation can be observed.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Vanesa Quintano, Valentin Diez-Cabanes, Simone Dell'Elce, Lorenzo Di Mario, Stefano Pelli Cresi, Alessandra Paladini, David Beljonne, Andrea Liscio, Vincenzo Palermo
Summary: It is important and challenging to measure the induced switching of molecules in various chemical environments. The study compared the switching behavior of azobenzene molecules in different liquid and solid environments, with varying speed and method of observation. The research demonstrated the ability to observe molecular switching in isolated ensembles and pave the way for studying molecular processes at the nanoscale.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Geosciences, Multidisciplinary
Lina Yamaya, Kimihiro Mochizuki, Takeshi Akuhara, Shunsuke Takemura, Masanao Shinohara, Tomoaki Yamada
Summary: In this study, we conducted CMT inversion for small-to-moderate aftershocks in the off Ibaraki region of the 2011 off the Pacific coast of Tohoku earthquake using high-frequency seismograms and a reliable seismic velocity model. The CMT solutions revealed different characteristics of the aftershock activities, including thrust earthquakes, intraslab strike-slip earthquakes, intraslab normal-fault earthquakes, various earthquake focal mechanisms above a subducting seamount, and normal-fault earthquakes shallower than the interplate earthquakes.
EARTH PLANETS AND SPACE
(2022)
Article
Chemistry, Inorganic & Nuclear
Stefan Benndorf, Sihem Groni, Leanne M. Stafast, Helmar Gorls, Claire Fave, Bernd Schollhorn, Wolfgang Weigand
Summary: In this study, mimicking complexes of [FeFe] hydrogenase (H(2)ase) with lipoic and selenolipoic acid moieties were synthesized and characterized. Different spectroscopic methods, including X-ray diffraction analysis, were used to determine their molecular structures. Cyclic voltammetry (CV) investigations revealed different redox behaviors among the mimics in the presence and absence of acetic acid (AcOH). The elaboration of surface confined systems and the formation of self-assembled monolayers (SAMs) on Pt electrodes were also studied.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Review
Metallurgy & Metallurgical Engineering
Ismaila Diedhiou, Balla Fall, Cheikh Gaye, Mohamed Lamine Sall, Abdou Karim Diagne Diaw, Diariatou Gningue-Sall, Modou Fall, Noureddine Raouafi
Summary: This review focuses on the trends and challenges in the development of electrochemical sensors for the determination of trace heavy metal ions in water. Composite materials based on organic conducting polymers and graphene have been developed to overcome the limitations of individual materials and improve sensitivity. Various methods of preparing composites and characterization methods have been discussed. The applications of these composites in electroanalysis of heavy metal ions and the results of electrochemical detection methods have been highlighted.
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Electrochemistry
Walid Mabrouk, Sonia Jebri, Khaled Charradi, Bishir Silimi, Abdullah Y. A. Alzahrani, Ali Boubakri, Ouassim Ghodbane, Noureddine Raouafi, Sherif. M. A. S. Keshk
Summary: Graphene was blended with sulfonated polyether sulfone octyl sulfonamide to enhance its proton conductivity. The hybrid film exhibited improved proton conductivity due to the hydrophilic-hydrophobic nature of the blend. The synthesized hybrid film showed desirable properties, such as contact angle, ion exchange capacity, water absorption, and thermal stability. Compared to the pristine SPESOS film, the hybrid film with 2 wt.% graphene showed better proton conductivity at 100% relative humidity, indicating superior performance in terms of proton conductivity, ion exchange capacity, and hydrophilicity.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Analytical
Maroua Meftah, Azza Habel, Sabrine Baachaoui, Basma Yaacoubi-Loueslati, Noureddine Raouafi
Summary: This study successfully detected single nucleotide polymorphisms (SNPs) in two genes using electrochemical bioplatforms based on thiolated DNA probes. The parameters influencing the analytical response were optimized, and the bioplatforms showed high reliability and selectivity in detecting SNPs in diluted genomic DNA.
Article
Chemistry, Analytical
Amira Ben Hassine, Noureddine Raouafi, Felismina T. C. Moreira
Summary: A carbon screen-printed electrode (C-SPE) decorated with graphene oxide/Prussian Blue nanocubes (GO/PBNCs) was developed as an innovative sensing device for the selective and sensitive determination of Tau-441 protein, which is a promising biomarker for early diagnosis of Alzheimer's disease.
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2023)
Article
Chemistry, Analytical
Sabrine Baachaoui, Mohamed Mastouri, Maroua Meftah, Basma Yaacoubi-Loueslati, Noureddine Raouafi
Summary: This study presents a magnetic electrochemical bioassay for the detection of T > G single nucleotide polymorphism (SNP) within the inteleukin-6 (IL6) gene in human genomic DNA. The bioassay achieves high sensitivity and specificity with a low detection limit, and can detect the variation in diluted human DNA samples and distinguish between different genotypes. This method is useful for cohort studies targeting mutations in human DNA.
Article
Chemistry, Analytical
Asma Dhehibi, Abdelmounaaim Allaoui, Amal Raouafi, Mohammed Terrak, Balkiss Bouhaouala-Zahar, Mohamed Hammadi, Noureddine Raouafi, Imed Salhi
Summary: In this study, a nanobody-based magnetofluorescent immunoassay was designed for the sensitive detection of pathogenic E. coli F17-positive strains. The assay recognized E. coli F17 with high specificity and sensitivity, with a detection limit of 1.8 CFU/mL in fecal samples without pretreatment. The immunoassay remained stable for at least one month when stored at 4 degrees C.
Article
Chemistry, Physical
Sabrine Baachaoui, Walid Mabrouk, Amal Rabti, Ouassim Ghodbane, Noureddine Raouafi
Summary: A facile method was developed to fabricate laser-induced graphene from amPES membranes, which were applied as flexible electrodes for microsupercapacitors. Doping amPES membranes with carbon black microparticles improved their energy storage performance. The electrolyte had a significant effect on the electrochemical performance, with the highest areal capacitance achieved in 0.5 M HClO4. The CB-doped PES membranes exhibited low carbon fingerprint, cost-effectiveness, high electrochemical performance, and potential applications in wearable electronic systems.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Analytical
Faisal K. Algethami, Amal Rabti, Mohamed Mastouri, Sami Ben Aoun, Laila S. Alqarni, Mohamed R. Elamin, Noureddine Raouafi
Summary: An ultrasensitive capacitance-based biosensor has been developed for the detection of kanamycin at sub-femtomolar levels. The biosensor demonstrates a remarkable detection limit of 0.3 fM and is successfully applied in detecting kanamycin in milk samples with good recovery.
Article
Chemistry, Analytical
Bibata Ouedraogo, Sabrine Baachaoui, Amidou Tall, Issa Tapsoba, Noureddine Raouafi
Summary: Laser-induced graphene electrodes (LIGEs) modified with gold nanoparticles (AuNPs/LIGE) are designed as sensitive and cost-effective sensors for the simultaneous detection of dopamine and uric acid. The electrodes showed improved electrochemical properties and achieved good recoveries in the detection of these biomarkers.
Article
Chemistry, Physical
Arvinder Singh, Christel Laberty-Robert, Veronique Balland, Benoit Limoges
Summary: This study investigates the charge storage mechanism of manganese oxides (MnOx) in mild aqueous Zn batteries through quantitative and comparative electrochemical analysis. The results show that the oxidation state and crystallinity of MnOx have little impact on the electrochemical reactivity, with all MnOx being fully converted into soluble Mn2+ during discharge. Additionally, the study reveals the effect of Mn3O4 dismutation in acidic electrolytes and emphasizes the importance of studying Mn3O4 under mildly acidic to neutral pH conditions to understand its thermodynamics and kinetics. Furthermore, the study confirms the phase transformation of Mn3O4 to Mn5O8 and the formation of amorphous MnO2 electrodeposits on top of Mn3O4 in Mn2+-free electrolytes. Finally, the study concludes that subsequent charge/discharge cycles rely on reversible proton-coupled electrodeposition of amorphous MnO2, regardless of the starting MnOx material.
ADVANCED ENERGY MATERIALS
(2023)
Article
Multidisciplinary Sciences
Sabrine Baachaoui, Walid Mabrouk, Khaled Charradi, Bechir Slimi, Ahmed M. Ramadan, Rehab M. I. Elsamra, Akram Alhussein, Sherif M. A. S. Keshk, Noureddine Raouafi
Summary: This paper presents the synthesis and characterization of a novel polyketimine (PKI) membrane and the introduction of laser-induced graphene electrodes (LIGEs) for efficient electrochemical sensing of paracetamol (PCM). The LIGEs showed excellent performance in PCM sensing, with a linear detection range of 50-600 μM and a low detection limit of 14.3 μM. Functionalization of the electrode surface with AuNPs further improved the electrode properties and lowered the detection limit to 1.1 μM. These affordable electrodes hold great potential for analyzing other drugs and detecting heavy metal cations in various applications.
ROYAL SOCIETY OPEN SCIENCE
(2023)
Article
Chemistry, Analytical
Rabiaa Helim, Ali Zazoua, Nicole Jaffrezic-Renault, Hafsa Korri-Youssoufi
Summary: We aimed to develop an electrochemical sensor for detecting the highly toxic water contaminant divalent metal ion (lead II). A sensor was formed using hemicellulose polysaccharide extracted from the Opuntia Ficus Indica cactus associated with agarose as a sensitive layer on a gold electrode. The sensor demonstrated high sensitivity towards Pb2+ with a detection limit of 1.3 fM, showing a potential application for lead detection in river and sea water.
Article
Chemistry, Multidisciplinary
Sarah Aldulaijan, Afnan M. M. Ajeebi, Abdesslem Jedidi, Sabri Messaoudi, Noureddine Raouafi, Adnene Dhouib
Summary: Graphene and other 2D materials were investigated for their gas sensing properties. Carbenes exhibited stronger affinity for graphene compared to diazomethanes. Esters showed decreased adsorption energy on graphene, while compounds with fluorine atoms demonstrated increased adsorption energy. Phenyl and nitrophenyl groups exhibited decreased adsorption energy. Importantly, all modified derivatives showed favorable interactions with gases. Derivative 3a, acting as a hydrogen bonding donor, showed superior performance. Modified graphene derivatives exhibited the highest adsorption energy with NO2 gas, highlighting their potential for selective NO2 sensing applications.
Article
Energy & Fuels
Sabrine Baachaoui, Walid Mabrouk, Ouassim Ghodbane, Noureddine Raouafi
Summary: This study presents an efficient and scalable method to modify polyimide-based laser-induced graphene using environmentally friendly additives. The modified composite materials show enhanced electrochemical performance and are used as flexible electrodes for high-performance all-solid-state microsupercapacitors. The addition of carbon black and Prussian blue significantly increases the areal capacitance of the microsupercapacitors, and the use of a PVA/H2SO4 gel electrolyte improves their stability and energy density. The modified microsupercapacitors exhibit excellent electrochemical stability, making them suitable for low-energy-consuming electronics.
JOURNAL OF ENERGY STORAGE
(2024)