Article
Chemistry, Physical
Shuichi Toyouchi, Mathias Wolf, Guilin Feng, Yasuhiko Fujita, Beatrice Fortuni, Tomoko Inose, Kenji Hirai, Steven De Feyter, Hiroshi Uji-I
Summary: We present a facile all-optical method for spatially resolved and reversible chemical modification of a graphene monolayer. By using a tightly focused laser under water, sp(3)-type chemical defects can be introduced by photo-oxidation, and then reversibly restored to sp(2) carbon centers by a higher intensity laser through photoreduction induced by local heating. These optical methods, combined with laser direct writing technique, allow photowriting and erasing of well-defined chemical patterns on graphene with a spatial resolution of about 300 nm. The pattern can be visualized and optically read out by Raman mapping with the same excitation laser. We demonstrate the all-optical Write/Read-out/Erase of chemical functionalization patterns on graphene simply by adjusting the one-color laser intensity. This all-optical method enables flexible and efficient tailoring of physicochemical properties at the nanoscale for future applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Mohammed Majdoub, Abdallah Amedlous, Zakaria Anfar, Amane Jada, Noureddine El Alem
Summary: A versatile binding chemistry was engineered on the surface of graphene oxide using nucleophilic substitution/amidation reactions to efficiently adsorb Cd (II), Cu (II), and Pb (II). The hybrid adsorbents showed high removal efficiencies for heavy metal ions in aqueous solutions and tap water, with excellent regeneration ability for multiple adsorption-desorption cycles. The adsorption mechanism involved electrostatic and chelation interactions between alginate and functionalized graphene oxide.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
R. Castellanos-Espinoza, S. Fernandez-Tavizon, U. Sierra-Gomez, E. A. Elizalde-Pena, G. Luna-Barcenas, L. A. Baldenegro-Perez, Lilian I. Olvera, L. V. Gonzalez-Gutierrez, C. M. Ramos-Castillo, Noe Arjona, B. L. Espana-Sanchez
Summary: The green surface modification of graphene oxide (GO) using lysine (Lys) under different pH conditions was studied. At pH 2, ester bonds were formed on the GO surface, while at pH 9.8, C-N bonds were formed. At pH 14, chemical reduction of GO nanosheets occurred. The results suggest that controlled chemical functionalization/reduction of GO nanosheets can be achieved under specific pH conditions, benefiting their potential use in biological applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Qun Liu, Jing Liang, Bin Tian, Enbo Xue, Xinyu Zhang, Panwang Guo, Ke Zheng, Guilin Tang, Wei Wu
Summary: Harvesting electricity through water evaporation is renewable and environmentally friendly, but current generators have limited power supply. This study presents a high-performance textile-based evaporation-driven electricity generator using continuous gradient chemical reduced graphene oxide (CG-rGO@TEEG). The CG-rGO@TEEG can generate a voltage of 0.44 V and a current of 590.1 mu A with an optimized power density of 0.55 mW cm(-3) when NaCl solution is applied. This work provides a novel approach for efficient clean energy harvesting based on water evaporation.
Article
Chemistry, Physical
Shaochong Yin, Hongxing Wu, Xiaobin Yi, Zhiyuan Huang, Chengping Ye, Pengfei Li, Yixuan Zhang, Junqin Shi, Ke Hua, Haifeng Wang
Summary: This study found that the adsorption of graphene oxide (GO) on bearing steel can be improved by preparing a boronized functionalization layer on the surface. The boronized surface, lubricated with 1 wt % GO nanosheets as water-based additives, achieved an ultralow friction state with a friction coefficient of 0.03. Molecular dynamics (MD) simulation revealed that the high adhesion energy between the boronized surface and GO contributed to the preferential adsorption of GO on the sliding surface to form the tribofilm, leading to impressive synergistic lubrication performance.
Article
Chemistry, Multidisciplinary
Zineb Benzait, Pengwan Chen, Levent Trabzon
Summary: This study improved the synthesis of graphene oxide and obtained high-quality graphene oxide through an important pretreatment step. The oxidation time and temperature were reduced while maintaining the high degree of oxidation, making the produced reduced graphene oxide films attractive for practical applications.
NANOSCALE ADVANCES
(2021)
Article
Engineering, Environmental
Rini K. Vishwakarma, Pavan K. Narayanam, R. Umamaheswari, S. R. Polaki
Summary: Graphene oxide (GO) membranes were functionalized with nitrogen groups through exposure to NH3 vapours, resulting in enhanced Sr adsorption capacity. The NH3 treatment introduces amine, amide, and ammonium functionalities, which react with Sr2+ ions to form complexes. The nitrogen functionalization improves Sr adsorption regardless of the exposure duration and GO precursor type. These NH3-treated GO membranes exhibit optimum Sr adsorption performance, reusable for at least nine cycles, and can release 35-60% of adsorbed Sr. This study demonstrates an energy-efficient solid state membrane-based procedure for selective Sr separation, and provides a platform for separating toxic elements with affinity for N-groups.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Jianpeng Liu, Wenchang Zhang, Chang Cheng, Juncheng Zhu, Tianle Wang, Kun Ni, Zifeng Lin, Zefeng Guan, Yanwu Zhu, Jiliang Zhu
Summary: This study presents a rapid reduction method for graphene oxide (GO) by bringing GO foam into contact with semi-molten metals such as tin (Sn) and lithium (Li). The electrical resistance of GO foam is significantly reduced by its interaction with these metals, even in dry air. By employing tin foil and calcination, the rGO with remarkably lower electrical resistivity is fabricated, demonstrating its potential as an electrode material for lithium-sulfur batteries.
Article
Chemistry, Physical
Suprakash Samanta, Rashmi R. Sahoo
Summary: This study demonstrated a simple and multistep approach for the covalent functionalization of chemically-prepared graphene oxide with branched polyethylenimine to prepare polymer brushes as nanolubricants. The PB particles significantly reduced the coefficient of friction and wear in steel-steel tribopairs, while exhibiting high load-bearing ability. Among the functionalized polymeric GO particles, PSS polyelectrolyte containing GO-PEI-PSS showed the best COF and wear reduction ability with high load-bearing capacity.
Article
Chemistry, Physical
Shenglong Zhu, Jinbo Zeng, Shengdi Zhang, Wenqi Song, Yanxia Sun, Xiufeng Ren, Xiang Li, Chunxi Hai, Yue Shen
Summary: Controlling the triboelectrification behaviors of graphene-based materials is crucial for the performance and reliability of graphene-based triboelectric nanogenerators. This study investigates the triboelectric charges on graphene oxide (GO) and reduced graphene oxide (RGO) and finds that the charges are localized in the rubbed region on GO but distributed over the whole sheet on RGO. The surface morphology, contact forces, and friction modes greatly influence the triboelectric charging process. The initial potential also affects the triboelectric potential and charge distribution on RGO.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Shenglong Zhu, Jinbo Zeng, Shengdi Zhang, Wenqi Song, Yanxia Sun, Xiufeng Ren, Xiang Li, Chunxi Hai, Yue Shen
Summary: Controlling the behavior of graphene-based materials in triboelectrification is crucial for optimizing output performance and reliability of graphene-based triboelectric nanogenerators. This study investigated the triboelectrification behaviors of graphene oxide (GO) and thermally and chemically reduced graphene oxide (RGO) using scanning probe microscopy. The results revealed that the distribution of triboelectric charges on GO is localized due to its sp3 hybridized structure, while on RGO, the charges are distributed over the entire sheet because of the restored sp2 structure. Factors such as wrinkles, contact forces, and friction modes in the rubbing process had a significant influence on the triboelectric charging process of RGO. Additionally, the triboelectric potential was found to be linearly dependent on the initial potential, and tunneling triboelectrification on RGO exhibited a localized distribution of charges. These findings provide valuable insights for regulating triboelectric charges on graphene-based materials and designing high-performance graphene-based triboelectric nanogenerators.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Energy & Fuels
Chau Van Tran, Mahima Khandelwal, Jungbae Lee, Anh Phan Nguyen, Jung Bin In
Summary: This study proposes a controlled self-propagating reduction of GO films by adjusting the base temperature within low values, demonstrating competitive performance and cycling stability of rGO films as supercapacitor electrodes. The research opens a new avenue for producing high-quality rGO at minimal energy cost using the self-propagating reduction of GO films.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Yasamin Hosseini, Mahsa Najafi, Soodabeh Khalili, Mohsen Jahanshahi, Majid Peyravi
Summary: Amine-functionalized solid adsorbents have shown promising potential for capturing CO2 selectively under ambient conditions. Experimental results demonstrate significantly improved CO2 uptake using amine-functionalized GO samples, indicating excellent selectivity for capturing CO2.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Sabrin Al-Fogra, Bowen Yang, Lisa Jurkiewicz, Frank Hauke, Andreas Hirsch, Tao Wei
Summary: This study presents a facile and universal laser writing approach for covalent patterning of graphene, leading to the formation of graphene architectures consisting of antaratopically functionalized superlattices, which were previously elusive.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Biochemistry & Molecular Biology
Dina Lotfy, Gharieb S. El-Sayyad, Nabila Shehata
Summary: A novel eco-friendly sorbent was prepared in this study, which is hexamethylenetetramine (HMTA) functionalized calcium alginate (AG) immobilized graphene oxide (GO) composite (AG-GO-HMTA) and hexamethylenetetramine functionalized calcium alginate composite (AG-HMTA). The adsorption factors on methylene blue (MB) removal from water, including pH impact, contact time, initial dye concentration, dosage, selectivity, and reusability, were investigated. The sorbents were characterized using structural, thermal, and morphological analysis techniques. The adsorption data was described by the Langmuir and Freundlich isotherms, and the kinetics and thermodynamics of adsorption were studied. The study also investigated the field performance and regeneration of the sorbents.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Multidisciplinary
Santosh Singh, Suprakash Samanta, Alok Kumar Das, Rashmi R. Sahoo
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2019)
Article
Engineering, Mechanical
Suprakash Samanta, Santosh Singh, Rashmi R. Sahoo
Article
Engineering, Mechanical
Santosh Kumar Singh, Suprakash Samanta, Alok Kumar Das, Rashmi R. Sahoo
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2019)
Article
Materials Science, Multidisciplinary
Suprakash Samanta, Santosh Singh, Rashmi R. Sahoo
Correction
Engineering, Mechanical
Suprakash Samanta, Santosh Kumar Singh, Rashmi R. Sahoo
Article
Materials Science, Multidisciplinary
Bipin Kumar Singh, Suprakash Samanta, Shibendu Shekhar Roy, Rashmi R. Sahoo, Himadri Roy, Nilrudra Mandal
MATERIALS RESEARCH EXPRESS
(2019)
Article
Energy & Fuels
Suprakash Samanta, Rashmi R. Sahoo
Summary: The study demonstrates a cost-effective method for preparing biodiesel from waste cooking oil, which serves as an alternative eco-friendly fuel and lubricant. The synthesized biodiesel exhibits excellent fuel efficiency and lubrication performance compared to conventional diesel fuel and hydrocarbon oils.
BIOENERGY RESEARCH
(2021)
Article
Engineering, Mechanical
Pritam Biswas, Suprakash Samanta, Amit Rai Dixit, Rashmi Ranjan Sahoo
Summary: The study investigated the microstructural and tribo-mechanical properties of Ni-P-B ternary coatings on steel specimens prepared through electroless deposition. Heat treatment at 390 degrees C had a significant impact on the mechanical and tribological properties of the coating, resulting in improved hardness and tribological performance. Microstructural analysis revealed a hydrophobic to hydrophilic transition in contact angle behavior, with the heat-treated coating exhibiting higher hardness and reduced coefficient of friction compared to the as-plated coating.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2021)
Article
Engineering, Electrical & Electronic
Samrina Sahir, Hwi-Won Cho, Palwasha Jalalzai, Suprakash Samanta, Satomi Hamada, Tae-Gon Kim, Jin-Goo Park
Summary: PVA brush scrubbing is a widely used post-CMP cleaning process. This study investigated the effects of abrasive types, slurry pH, and scrubbing process parameters on brush contamination. The results showed that brush contamination is more sensitive to the abrasive nature and concentration, the slurry pH, and the process time than to other parameters.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Physical
Suprakash Samanta, Rashmi R. Sahoo
Summary: This study demonstrated a simple and multistep approach for the covalent functionalization of chemically-prepared graphene oxide with branched polyethylenimine to prepare polymer brushes as nanolubricants. The PB particles significantly reduced the coefficient of friction and wear in steel-steel tribopairs, while exhibiting high load-bearing ability. Among the functionalized polymeric GO particles, PSS polyelectrolyte containing GO-PEI-PSS showed the best COF and wear reduction ability with high load-bearing capacity.
Article
Nanoscience & Nanotechnology
Suprakash Samanta, Rashmi R. Sahoo
ACS APPLIED NANO MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Suprakash Samanta, Santosh Singh, Rashmi R. Sahoo
NEW JOURNAL OF CHEMISTRY
(2019)
Article
Chemistry, Physical
Santosh Singh, Suprakash Samanta, Alok Kumar Das, Rashmi R. Sahoo
SURFACES AND INTERFACES
(2018)