Article
Materials Science, Multidisciplinary
Oladipo Folorunso, Yskandar Hamam, Rotimi Sadiku, Suprakas Sinha Ray, Gbolahan Joseph Adekoya
Summary: This study conducted preliminary research on the morphology, thermal stability, and diffraction properties of PPy and Gr using SEM, TGA, and XRD. A model based on the Gompertz equation was proposed and modified to control the resistivity of the polymer, considering various input variables and identifying the percolation threshold. The modified Gompertz model showed higher efficiency and reliability compared to experimental measurements, and it was recommended for predicting the electrical conductivity of composites due to its accuracy, efficiency, and versatility in data parameterization.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Nahla B. Mohamed, Maher F. El-Kady, Richard B. Kaner
Summary: 3D architectures based on graphene have attracted significant attention in the field of energy, sensing, and environmental applications. This work presents a simple electrochemical approach to directly deposit a functionalized graphene framework by utilizing electrostatic interactions. The resulting supercapacitors exhibit high specific and areal capacitance, low internal resistance, excellent cycling stability, and superior rate capability. Additionally, the graphene frameworks can be used as electrochemical sensors for the simultaneous determination of small biomolecules with high sensitivity, selectivity, and reproducibility.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Jaroslav Stejskal, Dusan Kopecky, Hayk Kasparyan, Jarmila Vilcakova, Jan Prokes, Ivo Krivka
Summary: This study investigated the pressure-sensing properties of melamine sponges coated with polypyrrole globules or nanotubes, examining the conductivity dependency on pressure and showcasing the superior performance of polypyrrole nanotubes in various applications beyond conductivity-related ones, such as electromagnetic radiation shielding and adsorption of organic dye.
ACS APPLIED NANO MATERIALS
(2021)
Article
Polymer Science
Rashida Jafer, Sarah A. A. Alsufyani, Javed Iqbal, Mohammad Omaish Ansari, Arshid Numan, Shahid Bashir, P. M. Z. Hasan, S. Wageh
Summary: In this study, a silver/graphene/polypyrrole/nickel hydroxide (Ag/GN/PPy/Ni(OH)(2)) nanocomposite was synthesized through a combination of oxidative polymerization and hydrothermal processes. The nanocomposite exhibited morphological characteristics of Ni(OH)(2) flakes and silver particles attached to the PPy globules, along with the presence of GN sheets and spherical silver particles. The electrochemical investigations showed that the nanocomposite electrode displayed the highest specific capacity and excellent cyclic stability when used in a supercapattery.
Article
Chemistry, Physical
Oladipo Folorunso, Yskandar Hamam, Rotimi Sadiku, Suprakas Sinha Ray, Gbolahan Joseph Adekoya
Summary: The main obstacle to energy sufficiency lies in the inability to effectively utilize and store abundant renewable energy sources. Polymers and their composites are seen as efficient energy storage materials, while the synthesis technologies of new materials such as graphene-polymer and borophene are being gradually improved.
Article
Materials Science, Multidisciplinary
Rizwan Khan, Keita Miyagawa, Alberto Bianco, Yuta Nishina
Summary: The covalent double functionalization of graphene oxide is an effective method to tune the properties of graphene-like materials, allowing the design of a multifunctional GO platform for applications in fuel cells as an electrolyte membrane and in supercapacitors as an electrode material.
APPLIED MATERIALS TODAY
(2021)
Review
Polymer Science
Oluwaseye Samson Adedoja, Emmanuel Rotimi Sadiku, Yskandar Hamam
Summary: The combination of graphene and conducting polymers has the potential to revolutionize energy storage by providing a more reliable, sustainable, and affordable energy source. Introducing graphene nanoparticles into conductive polymer nanoparticles is a promising technique to improve charge transfer efficiency. The fabrication method of graphene-polymer nanoelectrodes plays a critical role in their excellent performance, and various synthesis techniques for graphene, polypyrrole, and polythiophene are summarized in this review. The PPy/PTh/Gr nanocomposite is considered a promising nanoelectrode for sustainable and efficient energy storage, and future research should focus on improving materials synthesis techniques for multiple applications.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Oladipo Folorunso, Yskandar Hamam, Rotimi Sadiku, Suprakas Sinha Ray
Summary: This study thoroughly investigated the electrical properties of graphene-polypyrrole nanocomposites using a numerical model based on Simmons and McCullough equations. The results showed that tunneling resistance is a critical factor determining electron transport, and the electrical conductivity of the composite depends on the volume fraction of fillers.
Article
Polymer Science
Oladipo Folorunso, Yskandar Hamam, Rotimi Sadiku, Suprakas Sinha Ray, Neeraj Kumar
Summary: A hybrid of graphene nanoplatelets with polypyrrole was fabricated, with electrical conductivity measurements showing a percolation threshold. The Taherian and Clingerman models were found to closely describe the experimental data for the hybrids. The study demonstrates the significant influence of graphene nanoplatelets on modifying polypyrrole for energy storage applications.
Article
Chemistry, Multidisciplinary
Bharat Bhushan Upreti, Navpreet Kamboj, Ramendra Sundar Dey
Summary: Laser-irradiated graphene-based heterostructures have been studied for metal-free energy storage devices. Nitrogen-doped graphene (NG) prepared via laser irradiation on polyaniline-reduced graphene oxide (PANI-rGO) heterostructure shows excellent cycling stability and capacitance enhancement. The laser irradiation technique can be applied to fabricate NG-based microsupercapacitors (MSCs) with high charge storage capacitance and remarkable rate capability.
Article
Chemistry, Multidisciplinary
Bharat Bhushan Upreti, Navpreet Kamboj, Ramendra Sundar Dey
Summary: In this study, laser irradiation technique was used to prepare highly conducting and stable metal-free energy storage devices based on graphene-based heterostructures. Nitrogen-doped graphene (NG) was synthesized by in situ electrochemical polymerization and laser irradiation process, resulting in a microsupercapacitor (MSC) with extremely high cycling stability. The capacitance enhancement of the NG-MSC was attributed to the change of nitrogen species on the graphene film.
Article
Energy & Fuels
Rajat Arora, S. P. Nehra, Suman Lata
Summary: Ag/g-C3N4@ppy nanocomposites were synthesized via in-situ polymerization and characterized through various techniques. The study found that 0.9 APN exhibited the highest specific capacitance and good capacitive retention. The material showed excellent electrical energy accumulation compared to other samples.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Multidisciplinary
M. H. Dalal, S. Sayyar, C. -Y. Lee, G. G. Wallace
Summary: Composite electrodes are important electromaterials with tailored functional properties. Graphene-loaded thermoplastic polyurethane (PU) electrodes were prepared using cathodically exfoliated graphene (CEG). The CEG-PU composite electrodes exhibited high electrochemical capacitance, with an areal capacitance of 2.51 mF/cm(2), energy density of 1.56 mW/h/cm(2), and power density of 0.48 mW/cm(2) at 40% loading of graphene, a current density of 0.2 mA/cm(2), and an operating voltage of 1.0 V. These composite electrodes possess excellent conductivity, chemical/mechanical properties, and capacitive performance.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Oladipo Folorunso, Moses Oluwafemi Onibonoje, Yskandar Hamam, Rotimi Sadiku, Suprakas Sinha Ray
Summary: This study focuses on the fabrication of a hybrid polymer nanocomposite consisting of polyvinyl alcohol (PVA), polypyrrole (PPy), and reduced graphene oxide (rGO), and investigates its electrical conductivity. The experimental results show that the nanocomposite exhibits continuous conduction at a filler content of around 0.4% (wt%). The study also proposes and validates several models for analyzing the electrical transport property of the nanocomposite, and confirms the dependence of the electrical conductivity on the weight fraction of fillers. The flexibility, simplicity, and versatility of these models suggest their potential use as characterization/simulation tools for predicting the electrical conductivity of polymer composites.
Review
Chemistry, Multidisciplinary
Huihui Zhang, Dan Yang, Alan Lau, Tianyi Ma, Han Lin, Baohua Jia
Summary: Graphene-based supercapacitors have attracted attention due to their excellent properties, but face limitations in electrode surface area and conductivity. Hybridizing graphene with other species to improve performance is necessary. This review discusses different hybridization principles and summarizes recent progress and future directions for hybridized graphene electrodes.
Review
Engineering, Biomedical
Hamid Esmaeili, Alejandra Patino-Guerrero, Masoud Hasany, Mohammad Omaish Ansari, Adnan Memic, Alireza Dolatshahi-Pirouz, Mehdi Nikkhah
Summary: Myocardial infarction (MI) remains a major cause of death worldwide, with the use of electroconductive biomaterials showing promise in improving cardiac tissue engineering. This review article discusses the recent advancements in the application of electroconductive biomaterials for cTE and explores potential avenues for enhanced cardiac tissue engineering.
ACTA BIOMATERIALIA
(2022)
Article
Crystallography
Sajid Ali Ansari, Nazish Parveen, Mohd Al Saleh Al-Othoum, Mohammad Omaish Ansari
Summary: This study focuses on the design and development of a novel three-dimensional binder-free pseudocapacitive NiZn2O4 active material and evaluates its performance for energy storage applications. The NiZn2O4@3D-NF electrode shows excellent specific capacitance and cyclic stability, making it a promising candidate for the field of energy storage.
Article
Chemistry, Multidisciplinary
Sajid Ali Ansari, Mohammad Omaish Ansari, Ahmed Alshahrie, Mohammad Shahadat, Nazish Parveen, Reem Darwesh, Samia Faisal Aboushoushah
Summary: This study presents the physical, structural, thermal, and optical properties of heavy metal (Ho3+) oxide incorporated lithium-boro-phosphate glass prepared utilizing melt quenching process, as well as their dependence on the dopant concentration. The results show that the prepared glasses are amorphous with significant borate functional groups, and exhibit powerful emission colors, making them ideal candidates for applications with light-emitting diodes.
APPLIED SCIENCES-BASEL
(2022)
Article
Crystallography
Akhalakur Rahman Ansari, Sajid Ali Ansari, Nazish Parveen, Mohammad Omaish Ansari, Zurina Osman
Summary: In this study, silver nanoparticles decorated on reduced graphene oxide wrapped manganese oxide nanorods were synthesized and characterized. The electrochemical performance testing showed that the resulting Ag-rGO@MnO2 composite exhibited superior capacitance and excellent capacity retention, making it a promising active electrode material for future applications in electrochemical devices.
Article
Polymer Science
Humair Hussain, Asim Jilani, Numan Salah, Ahmed Alshahrie, Adnan MemiC, Mohammad Omaish Ansari, Joydeep Dutta
Summary: Due to the industrial revolution, fresh water reserves are being polluted every day and man-made activities have adverse effects upon the ecosystem. Therefore, it is necessary to explore new technologies to save and purify water resources. Capacitive deionization is considered as an emerging technique for removing excess ions to produce potable water and desalination.
Article
Chemistry, Multidisciplinary
Rajeev Kumar, Mohammad Oves, Mohammad Omaish Ansari, Md Abu Taleb, Mohamed Abou El-Fetouh Baraka, Mansour A. Alghamdi, Naief Hamoud Al Makishah
Summary: In this study, a series of aerogel materials were synthesized for the removal of pharmaceutical drugs and microbes from beverage industry wastewater. The Ni3S4/Ag2S/TiO2/CA aerogel showed high efficiency and achieved optimal removal under acidic conditions.
Article
Chemistry, Physical
Rajeev Kumar, Mohammad Omaish Ansari, Md Abu Taleb, Mohammad Oves, Mohamed A. Barakat, Mansour A. Alghamdi, Naief H. Al Makishah
Summary: In this study, an integrated adsorption-photocatalysis process was used to effectively remove oxytetracycline from aqueous solution by fabricating an adsorbent-photocatalyst integrated material. The results demonstrated that the combination of adsorption and photocatalysis can significantly improve the removal efficiency, and the material showed sustained efficacy even after multiple cycles of use.
Review
Chemistry, Multidisciplinary
Nazish Parveen, Mohammad Omaish Ansari, Sajid Ali Ansari, Pramod Kumar
Summary: Electrochemical supercapacitors have become widely used in electronic, medical, and industrial applications due to their impressive power output. The design of electrode materials, particularly nanostructured ones, plays a crucial role in the performance of supercapacitors. Among the various materials, titanium nitride (TiN) is considered ideal for efficient supercapacitors due to its high stability, electrical conductivity, and unique electronic structure. This paper reviews recent advancements in nanostructured TiN electrode materials for supercapacitors, including their challenges and future opportunities.
Review
Chemistry, Multidisciplinary
Varish Ahmad, Mohammad Omaish Ansari
Summary: Graphene and its nanocomposites have attracted significant interest due to their efficient antimicrobial properties. Graphene has found applications in tissue engineering and has been successfully conjugated with existing drugs to improve therapeutic efficacy. This review discusses the antimicrobial potential, synthesis, and toxicity of graphene-based nanomaterials in biological systems.
Article
Infectious Diseases
Varish Ahmad, Mohammad Omaish Ansari
Summary: In this investigation, a reduced graphene oxide-coated zinc oxide-copper (rGO@ZnO-Cu) nanocomposite with broad-spectrum antimicrobial potential was prepared. The nanocomposite exhibited big, irregular rods, rectangular and spherical-shaped ZnO, and anchored clusters of aggregated Cu particles. The rGO@ZnO-Cu complex showed antimicrobial activity against both Gram-positive and Gram-negative bacteria, with greater effectiveness against Staphylococcus aureus.
Article
Biochemistry & Molecular Biology
Mohammad Oves, Mohammad Omaish Ansari, Mohammad Shahnawaze Ansari, Adnan Memic
Summary: The rise of antimicrobial resistance has increased the demand for the next generation of antimicrobial coatings. In this study, graphene@curcumin-copper coatings were prepared using a chemical synthesis method and characterized by scanning electron microscopy and X-ray photon scattering. The coatings showed uniform distribution of curcumin and copper, and exhibited antimicrobial properties through contact-killing mechanisms, potentially reducing the risk of nosocomial infections.
Article
Polymer Science
Aftab Aslam Parwaz Khan, Mallikarjunagouda B. Patil, Laxmibai P. Rathod, Shivalila G. Vader, Pankaj Raizada, Pardeep Singh, Maha M. Alotaibi, Mohammad Omaish Ansari, Anish Khan, Naved Azum, Malik Abdul Rub, Muhammad Nadeem Arshad, Abdullah M. Asiri
Summary: The study assessed the potential of nanocomposite membranes (NCMs) made of sodium alginate and embedded with synthesized zeolitic imidazole framework-8 (ZIF-8) as fillers for separating gaseous mixtures generated by methane reforming. ZIF-8 crystals were synthesized through hydrothermal synthesis, with sizes ranging from 50 to 70 nm. NCMs with 15% filler loading (synthesized ZIF-8) outperformed neat polymer membranes in terms of H-2 permeability and selectivity, achieving a purity of up to 95%. However, NCMs did not perform better than neat polymer membranes in separating gas mixtures. The combination of ZIF-8 and sodium alginate as fillers is a new and worth investigating.
Article
Polymer Science
Rashida Jafer, Sarah A. A. Alsufyani, Javed Iqbal, Mohammad Omaish Ansari, Arshid Numan, Shahid Bashir, P. M. Z. Hasan, S. Wageh
Summary: In this study, a silver/graphene/polypyrrole/nickel hydroxide (Ag/GN/PPy/Ni(OH)(2)) nanocomposite was synthesized through a combination of oxidative polymerization and hydrothermal processes. The nanocomposite exhibited morphological characteristics of Ni(OH)(2) flakes and silver particles attached to the PPy globules, along with the presence of GN sheets and spherical silver particles. The electrochemical investigations showed that the nanocomposite electrode displayed the highest specific capacity and excellent cyclic stability when used in a supercapattery.
Article
Chemistry, Multidisciplinary
Bandar. A. A. Al-Mur, Mohammad Omaish Ansari
Summary: We synthesized a silver anchored and pTSA doped polyaniline/molybdenum disulfide nanocomposite for room temperature detection of ammonia and methanol. The nanocomposite showed high reproducibility and better sensing response compared to the individual components. The high electrical conductivity of the nanocomposite is attributed to the interactions between polyaniline and molybdenum disulfide, conductive silver, and the anionic dopant. The sensing mechanism involves chemisorption/desorption and electrical compensation.
Article
Physics, Applied
Aftab Aslam Parwaz Khan, Z. Fadil, Pankaj Raizada, Pardeep Singh, Maha Alotaibi, Mohammad Omaish Ansari, Anish Khan, Abdullah M. Asiri, Chaitany Jayprakash Raorane
Summary: A monolayer anthracene-like nanostructure was studied through Monte Carlo simulations to determine its compensation temperature and magnetic hysteresis cycle. The effects of exchange coupling on compensation and transition temperatures were discussed. The study also investigated the magnetic hysteresis cycles and surface of multi-loop hysteresis with respect to strong exchange coupling and temperature parameters. This research has significant implications for multi-state memories and nanotechnology.