Article
Chemistry, Inorganic & Nuclear
Hari Shankar Biswas, Subhashis Bala, Amit Kumar Kundu, Indranil Saha, Sandeep Poddar, Sanjit Sarkar, Prasenjit Mandal
Summary: This study successfully synthesized graphene oxide (GO) sheets with a bi-directional lamellar layer structure and analyzed and validated them through various instrumental characterizations. The morphology of GO thin film was also described in this experimental study.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
P. Sayfo, D. Z. Pirityi, K. Poloskei
Summary: Since its discovery in 2004, graphene has attracted significant attention for its unique properties and its potential for producing novel polymer composites with environmental and economic benefits. This review focuses on the practical testing of graphene and its elastomeric nanocomposites, highlighting the importance of factors such as layer thickness, oxygen content, and nanoparticle distribution for achieving strong reinforcement. X-ray diffraction spectroscopy, Raman spectroscopy, transmission electron microscopy, and energy dispersive spectroscopy are all valuable tools for characterizing these materials.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Wenqiang Xu, Abiola Ganiyat Olatoye, Yanbin Cui
Summary: Graphene has been a highly promising thermal management material in recent decades due to its excellent thermal performance and flexibility. However, the interaction between adjacent graphene nanosheets, which is Van der Waals, limits the improvement of thermal performance and flexibility in graphene-based heat-conducting films. In this study, a poly(ethylenimine) (PEI)/graphene oxide (GO)/carbon nanotubes (CNTs) heat-conducting film was fabricated, where PEI acts as a cross-linking agent to form cross-links between GO nanosheets, followed by carbonization and graphitization. Further investigations showed that the graphitized PEI/GO/CNTs film exhibited excellent mechanical properties with a tensile strength of 198.3 +/- 15.6 MPa, and excellent thermal performance with an in-plane thermal conductivity of 1038.4 +/- 25.07 W m(-1) K-1 and a through-plane thermal conductivity of 7.14 +/- 0.25 W m(-1) K-1. Graphene-based thermal conducting films hold great potential in various fields, such as electronics, aerospace, 5G, etc.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Environmental Sciences
Hongwei Luo, Yahui Xiang, Tian Tian, Xiangliang Pan
Summary: The research investigated the influence of photo-aging on the surface properties of a nano-TiO2 coated polyethylene film, revealing that photo-aging primarily affected the thermal properties and mechanical properties of the film, particularly the components surrounding the nano-TiO2 particles.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Materials Science, Ceramics
Rukia Fatima, Muhammad Farooq Warsi, Muhammad Ilyas Sarwar, Imran Shakir, Philips O. Agboola, Mohamed F. Aly Aboud, Sonia Zulfiqar
Summary: A new AgO center dot CuO center dot WO3/rGO nanocomposite was designed and fabricated to study its degradation ability under visible light. The nanocomposite showed a high photocatalytic efficiency with a degradation rate of 95% for methylene blue in 40 minutes, indicating its strong potential for organic dye removal from water.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Asmaa M. Abozied, Ayman M. Mostafa, A. Abouelsayed, A. F. Hassan, A. A. Ramadan, Emad A. Al-Ashkar, Badawi Anis
Summary: The non-linear optical properties of graphene oxide (GO) doped with low chirality metallic single-walled carbon nanotubes (m-SWCNTs) thin films were studied, showing reverse saturable absorption characteristics. The nonlinearity response of the films increased with the percentage of m-SWCNTs, making them ideal candidates for near-infrared laser protection applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Electrical & Electronic
Nicolo Lago, Marco Buonomo, Rafael Cintra Hensel, Francesco Sedona, Mauro Sambi, Stefano Casalini, Andrea Cester
Summary: The rise of graphene as an innovative electronic material has led to the study and development of new 2-D materials. Reduced graphene oxide (rGO) has emerged as a simple and cost-effective solution for thin-film transistors (TFTs). This study characterizes liquid-gated ambipolar rGO-TFTs and provides a description of their working principle. By modeling the transistors' off-state conductivity, important parameters were extracted from rGO-TFTs with different levels of electrochemical reduction. The extracted parameters reveal that rGO-TFTs have similar hole and electron mobilities, with the more pronounced p-type behavior attributed to a positive shift in the p-type and n-type threshold voltages.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Nanoscience & Nanotechnology
Lvkang Shen, Yang Zhang, Tianyu Liu, He Wang, Chunrui Ma, Ming Liu
Summary: Magnetoresistance-based devices have attracted attention due to their ability to use spins as information carriers. However, these devices face challenges such as limited magnetoresistance ratios, low work temperature, or high magnetic field. This study introduces a flexible bending-controlled magneto-resistance device based on the La0.67Ba0.33MnO3 film, achieving high magnetoresistive performance and suggesting possible applications such as tunable multistage switches.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Masami Aono, Hiroaki Kishimura
Summary: Through investigating the relationship between photo-induced deformation and the in-plane distribution of the chemical bonding state, it was found that a-CNx thin films deposited at different temperatures exhibit variations in IR spectral intensity and photoresponse.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Crystallography
Grazia Giuseppina Politano, Carlo Versace
Summary: This study investigates the electrical and optical characteristics of GO and RGO films by performing electric impedance measurements, optical microscopy, and variable angle spectroscopic ellipsometry tests. The results show that the electric resistance of RGO films is significantly lower than that of GO films. Additionally, thermal annealing enhances the optical conductivity and absorption coefficient of GO films.
Article
Engineering, Chemical
P. S. V. Vaishnavi, Soumitra Kar, A. K. Adak, Vandan Nagar, Vishal Singh, A. K. Debnath, Parag R. Nemade
Summary: This study focused on the modification of a thin film composite nanofiltration (TFC NF) membrane with amine to enhance its anti-biofouling properties. The surface of the membrane was grafted with graphene oxide (GO) using three different linkers. The GO-grafted membranes showed improved chlorine stability, reduced biofouling tendency, lower flux decline during seawater filtration, and enhanced hexavalent chromium rejection. The study also revealed that the improved chlorine stability was attributed to intermolecular hydrogen bonding between GO and the membrane structure, while the enhanced resistance to biofouling and lower flux decline were attributed to the hydrophilic nature of GO.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Young Hoon Cho, Seongmin Jeong, Seong-Joong Kim, Yeojin Kim, Hong Joo Lee, Tae Hoon Lee, Ho Bum Park, Hosik Park, Seung-Eun Nam, You-In Park
Summary: A facile graphene oxide pre-coating method was used to prepare defect-free, ultrathin film composite ceramic hollow fiber membranes with outstanding separation performance. The membranes showed 2-8 times higher water flux compared to commercial multilayered ceramic ultrafiltration membranes, highlighting the potential of cost-effective GO interlayer pre-coating methods for various molecular separation applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Manyi Chen, Jianquan Luo, Yinhua Wan, Xiangrong Chen, Xinquan Liang
Summary: This study investigates the effects of different shapes and loadings of CeO2 nanoparticles on the interlayers and properties of TFN membranes. It shows that the shape and loading of nanoparticles can effectively regulate the morphology and physicochemical properties of the polyamide layer, leading to improved permeability of the TFN membrane. The study provides insights into the role of nanoparticles in enhancing the separation performance of nanofiltration membranes.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Kecheng Guan, Kai Ushio, Keizo Nakagawa, Takuji Shintani, Tomohisa Yoshioka, Atsushi Matsuoka, Eiji Kamio, Wanqin Jin, Hideto Matsuyama
Summary: The solvent resistance of graphene oxide makes it a promising material for constructing membranes for precise separations with solvent-involved conditions. The substrate used plays a key role in forming GO laminates with desirable properties and optimizing the substrate can significantly improve membrane performance.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Raffaella Ferraiuolo, Michela Alfe, Valentina Gargiulo, Giovanni Piero Pepe, Francesco Tafuri, Alessandro Pezzella, Giovanni Ausanio, Domenico Montemurro
Summary: A new class of graphene-related materials, named graphene-like (GL) materials, has been developed as water suspensions through a two-step oxidation/reduction process. The GL materials self-assemble into thin amorphous films upon drying and consist of clusters of nanoparticles around 40 nm in size. The electrical transport properties and interaction with different surfaces of the GL films were characterized in this study. The results showed non-linear current-voltage relationship and consistent dielectric constant values. The GL materials also did not show significant interactions with different substrates. These findings lay the foundation for various applications of GL materials in electronics, optics, sensors, membranes, functional coatings, and biodevices.
Article
Materials Science, Multidisciplinary
S. Al-Kamiyani, Tariq Mohiuddin
Article
Chemistry, Multidisciplinary
Joe Otsuki, Takumi Okumura, Kosuke Sugawa, Shin-ichiro Kawano, Kentaro Tanaka, Takehiro Hirao, Takeharu Haino, Yu Jin Lee, Seongsoo Kang, Dongho Kim
Summary: This study focused on the self-assembly of zinc porphyrin derivatives with meta-pyridyl groups in chloroform, revealing a unique trimer structure with a triangular cone shape. Incorporation of a porphyrin-ferrocene dyad into the assemblies led to a rare light-harvesting/charge-separation system with energy gradient and reductive quenching.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
Nashiour Rohman, Tariq Mohiuddin
Summary: Complex permittivity measurements of decyltrimethylammoniumbromide+water+styrene microemulsions in the o/w region were conducted, revealing two relaxation processes related to the diffusion of counter ions around charged micelles at lower surfactant concentrations.
JOURNAL OF SOLUTION CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Kosuke Sugawa, Satoshi Yoshinari, Shiryu Watanabe, Kosuke Ishida, Shota Jin, Naoto Takeshima, Toru Fukasawa, Misa Fukushima, Ryuzi Katoh, Kouichi Takase, Hironobu Tahara, Joe Otsuki
Summary: In this study, a significant improvement was achieved in the threshold light excitation intensity and the upconverted emission intensity in a solid-state TTA-UC film by stacking the film with periodic Ag half-shell arrays. The enhancement of the upconverted emission was attributed to the photoexcitation enhancement of the sensitizer by elongating the excitation light path length inside the TTA-UC film. Additionally, the upconverted emission was improved using low-cost Al half-shell arrays, although the enhancement factor was lower compared to Ag half-shell arrays.
Article
Materials Science, Ceramics
Tsuyoshi Akiyama, Kenta Aiba, Toya Otsuki, Natsuki Koyama, Takeo Oku, Kosuke Sugawa, Sunao Yamada
Summary: Plasmonic nanostructured gold-titania film composites were fabricated and evaluated for their dye fluorescence enhancement properties. The excitation of porphyrin dye by plasmonic electric fields could be controlled by the number of repetitions of surface sol-gel processes. Significant fluorescence enhancement of porphyrin dye was observed using the gold-titania film composites.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Petroleum
Salim Saif Al-Kamiyani, Tariq Mohiuddin
Summary: Reduced graphene oxide (rGO), a derivative of graphene, shows promising implications in oil/water separation. The performance of rGO depends on the oil-in-water phase ratio, rGO dosage, and interaction time.
SPE PRODUCTION & OPERATIONS
(2022)
Article
Chemistry, Multidisciplinary
Nashiour Rohman, Tariq Mohiuddin, Khalid Ahmed, Imran Khan, Sanchayita Rajkhowa, Adam A. Skelton
Summary: This article presents a theoretical model for predicting the electrostatic interactions between an assembly of a host and a guest with acid-base characteristics in pH-dependent manner. The model is proven to be accurate based on experimental data and DFT-based estimates. The loading and releasing of drug molecules agreed well with experimental observations and density functional theory calculations. The degree of functionalization and drug concentration affect the pH for drug loading and releasing as well as the electrostatic interaction energy.
Article
Chemistry, Physical
Ryuzi Katoh, Kazunari Takahashi, Kosuke Sugawa
Summary: By studying five commercially available TiO2 photocatalysts, it was found that photoluminescence is a minor channel in the photophysical processes of these materials, and luminescence mainly arises from the bulk of the particles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Review
Chemistry, Multidisciplinary
Jotaro Honda, Kosuke Sugawa, Hironobu Tahara, Joe Otsuki
Summary: Improving the performance of triplet-triplet annihilation (TTA-UC) upconversion systems has wide-ranging implications in solar devices, nano-bioimaging, and nanotherapy. This review focuses on the use of localized surface plasmon (LSP) resonance of metal nanostructures to enhance TTA-UC system performance and explores potential applications. The review discusses new sensitizers with distinct characteristics, metal-enhanced fluorescence, and presents experiments demonstrating increased upconverted emission in plasmonic TTA-UC systems. The review also highlights the improved performance of photocatalysts and discusses future developments in plasmonic TTA-UC systems.
Article
Chemistry, Inorganic & Nuclear
Nashiour Rohman, Tariq Mohiuddin, Majid S. Al-Ruqeishi
Summary: There has been an increase in research on the surface free energy of low-dimensional materials in recent years. Graphene-based composites are becoming increasingly popular in industry as coating materials, and the surface free energy of graphene plays a crucial role in its adherence to supporting substrates. This article critically evaluates the surface free energy of coatings made from graphite base, graphene, and graphene oxide based on contact angle data, using various techniques such as the Zisman, Neumann, Fowkes, Owens-Wendt-Fowkes, and van Oss, Chaudhury, Good method. The findings provide important information for the development of graphene-based composites in the coatings sector.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jotaro Honda, Kosuke Sugawa, Seiya Fukumura, Ryuzi Katoh, Hironobu Tahara, Joe Otsuki
Summary: The distance dependence of triplet-triplet annihilation upconversion (TTA-UC) systems remains unexplored. This study investigated the influence of the spatial distance between Ag nanoprisms (AgPRs) and TTA-UC thin films on UC emission. The optimal distance was found to be significantly longer than typical metal-enhanced fluorescence systems. The UC emission enhancement was affected by factors such as PdOEP photoexcitation rate, triplet-triplet energy transfer efficiency, DPA lifetime, and fluorescence efficiency.
Article
Materials Science, Biomaterials
Kosuke Sugawa, Arisa Suzuki, Jotaro Honda, Taiku Yabuki, Hironobu Tahara, Yutaro Hayakawa, Masato Furuya, Hiroki Ikake, Tsuyoshi Kimura, Yasuhiro Kosuge, Satoshi Kurumi, Tsuyoshi Akiyama, Kouichi Takase, Joe Otsuki
Summary: In this study, a low-cost Cu-based nanostructure with localized surface plasmon (LSP) resonance was developed as a photothermal therapy agent in the second biological transparency window. The strong LSP resonance and superior photothermal conversion ability were achieved by generating the dipolar bonding mode between the nanoshell dipole and the nanohole dipole. The cytotoxicity of Cu-based nanostructures was effectively suppressed by surface protection, making them excellent photothermal therapy agents.
JOURNAL OF MATERIALS CHEMISTRY B
(2023)
Article
Multidisciplinary Sciences
Majid S. Al-Ruqeishi, Tariq Mohiuddin, Khaloud Al-Amri, Nashiour Rohman
Summary: Graphene, as the thinnest 2D material, has attracted intensive research attention due to its unique properties. This report investigates the surface free energy and wettability of graphene by measuring the static contact angle of liquid droplets on graphene-coated copper and silicon substrates. The results demonstrate that both copper- and silicon-coated substrates increase the contact angle, indicating the hydrophobicity of graphene layers.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Kosuke Sugawa, Yutaro Hayakawa, Yukiko Aida, Yuto Kajino, Kaoru Tamada
Summary: This study proposes a methodology for the fabrication of two-dimensional assembled colloidal nanocrystals based on the classical theory and temperature/surface tension gradients. The obtained silver nanoprisms film exhibited surface-enhanced Raman scattering activity, which was further enhanced by low-pressure plasma treatment. A SERS-based invisible printing platform was demonstrated using patterned nanoprism films.
Review
Materials Science, Multidisciplinary
Joe Otsuki, Kosuke Sugawa, Shota Jin
Summary: When light shines on metallic nanostructures, the free electrons oscillate in resonance with the light, resulting in intense scattering and absorption known as localized surface plasmon resonance (LSPR). The LSPR can be utilized for sensing purposes due to its sensitivity to various parameters. Gold and silver triangular nanoprisms are advantageous for LSPR-based sensors.
MATERIALS ADVANCES
(2021)