Article
Chemistry, Multidisciplinary
Quanfeng He, Lanping Zeng, Lianhuan Han, Matthew M. Sartin, Juan Peng, Jian-Feng Li, Alexander Oleinick, Irina Svir, Christian Amatore, Zhong-Qun Tian, Dongping Zhan
Summary: Studies have shown that the adsorption of atomic hydrogen on single layer graphene can effectively store hydrogen and is suitable for solutions involving hydrogen fuel cells for vehicles. Utilizing a Pt-electrocatalyzed spillover-surface diffusion-chemisorption mechanism, hydrogenation of graphene can be carried out under mild conditions, demonstrating high storage capacity and stability.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Emmanuel Picheau, Anthony Impellizzeri, Dmitry Rybkovskiy, Maxime Bayle, Jean-Yves Mevellec, Ferdinand Hof, Hassan Saadaoui, Laure Noe, Abraao Cefas Torres Dias, Jean-Luc Duvail, Marc Monthioux, Bernard Humbert, Pascal Puech, Christopher P. Ewels, Alain Penicaue
Summary: Above a critical diameter, carbon nanotubes collapse into flattened forms, leading to unique Raman spectra changes. The presence of edge cavities and curvature changes near the edges activate a D band despite overall continuity in the structure. The differing perspectives of chemists and physicists on defects in carbon structures may lead to confusion for researchers in nanotechnologies.
Article
Multidisciplinary Sciences
Elijah Flores, Jianying Ouyang, Francois Lapointe, Paul Finnie
Summary: The chemical purity of materials is crucial for semiconductor applications. This study uses spatially-mapped Raman spectra to extract spectral components and derive weighting factors, allowing for the determination of minority species abundance in mixtures of carbon nanotubes.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Zhichen Yan, Shuangyue Wang, Xianjue Chen, Geedhika K. Poduval, John A. Stride
Summary: Chemical vapor deposition (CVD) shows great potential in large-scale production of graphene films. A new method has been developed to directly grow graphene films on crystalline silicon wafers with a 300 nm oxide layer using a seeded-CVD growth approach. The use of methane as feedstock and optimized graphene seeds has improved the film formation, which consists of graphene layers formed by the coalescence of expanding graphene seeds according to SEM, X-ray photoelectron and Raman spectroscopies. The films also exhibit regions of single graphene crystallites resulting from lateral growth of the seeds. Moreover, the unilateral conductivity of the graphene films suggests potential application in device fabrication due to the presence of graphene nanoribbons.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Thiago A. Moura, Wellington Q. Neves, Rafael S. Alencar, Y. A. Kim, M. Endo, Thiago L. Vasconcelos, Deyse G. Costa, Graziani Candiotto, Rodrigo B. Capaz, Paulo T. Araujo, Antonio G. Souza Filho, Alexandre R. Paschoal
Summary: The unique electronic and vibrational properties of linear carbon chains (LCCs) have attracted attention recently. Raman spectroscopy has been widely used to identify LCC and study its properties. This study investigates the optical resonance window of LCCs encapsulated by multi-walled carbon nanotubes (MWCNTs) and a Raman signature assigned to the LCC's longitudinal acoustic phonon mode. First-principles calculations support the conclusions.
Article
Chemistry, Multidisciplinary
Alireza Yaghoubi, Ali Ramazani, Hossein Ghasemzadeh
Summary: This study presents a novel method for producing PAM/O-MWCNT hydrogel films without organic cross-linkers, utilizing a mechanism based on reactive oxygen species. The hydrogels demonstrate excellent swelling performance and mechanical strength, making them promising for various applications.
Article
Chemistry, Physical
Yizhuo Wang, Kuncai Li, Jing Wang, Xu Dai, Xu Sun, Daotong Chong, Junjie Yan, Liuyang Zhang, Hong Wang
Summary: The use of biopolymer and carbon nanotube hybrids enables the development of high performance and flexible thermoelectric materials, fulfilling the concept of green energy produced by green materials. The study achieved a high power factor and high electrical conductivity at a low carbon nanotube concentration.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Polymer Science
Guillaume Pillet, Pascal Puech, Sebastien Moyano, Frederic Neumayer, Wolfgang Bacsa
Summary: The conductivity of thermoplastic polymers can be effectively enhanced by incorporating carbon nanotubes on the surface. Multiwall carbon nanotubes thin films were transferred onto the polymer surface to form composite layers with electrical conductivity up to 8 S/cm, showing variations at 2.8 vol% of nanotubes. The distribution and quantity of nanotubes were studied using transmission electron microscopy and optical transmission measurements.
Article
Engineering, Manufacturing
Ayaka Aoki, Toshio Ogasawara, Takuya Aoki, Yuichi Ishida, Yoshinobu Shimamura, Yoku Inoue
Summary: This study utilized polarized Raman spectroscopy to assess the strain in aligned multi-walled carbon nanotube/epoxy composites, aiming to clarify the effective elastic modulus of the carbon nanotubes. The Raman shift rate of the G' band of the carbon nanotubes was found to be 18.84 cm(-1)/% corresponding to the tensile strain of the composite specimen. Through Mori-Tanaka theory and consideration of the three-dimensional orientation distribution of the carbon nanotubes, the effective elastic modulus of the carbon nanotubes was estimated to be 400 GPa. The results demonstrated the utility of Raman spectroscopy in experimentally evaluating the effective elastic modulus of multi-walled carbon nanotubes in composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Samuel Faucher, Matthias Kuehne, Hananeh Oliaei, Rahul Prasanna Misra, Sylvia Xin Li, Narayana R. Aluru, Michael S. Strano
Summary: Recent measurements have shown that fluids under extreme confinement, such as water in narrow carbon nanotubes, deviate significantly from theoretical descriptions. In this study, precise replicas of carbon nanotubes filled with water were generated and analyzed using Raman spectroscopy. The results revealed the presence of submicron vapor-like and liquid-like domains in partially filled nanodroplet states, and a Clausius-Clapeyron-type model was used to calculate the heats of condensation of water inside different diameter carbon nanotubes. The findings suggest the potential of molecular engineering of nanoconfined liquid/vapor interfaces for water treatment or membrane distillation.
Article
Chemistry, Multidisciplinary
Weili Cui, Lei Shi, Kecheng Cao, Ute Kaiser, Takeshi Saito, Paola Ayala, Thomas Pichler
Summary: Carbyne is a one-dimensional allotrope of carbon, which is stable when grown encapsulated in carbon nanotubes. By using isotopic labeling as a tuning mechanism, researchers were able to control its properties and achieve pioneering results with around 11.9% of C-13 labeling.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Materials Science, Multidisciplinary
Zheling Li, Libo Deng, Ian A. Kinloch, Robert J. Young
Summary: Raman spectroscopy is a crucial technique for analyzing carbon-based materials, providing unique insights into their microstructure. It allows for characterization of aspects such as orientation, layers, defects, and doping, enabling standardization and quality control. The application of Raman spectroscopy in studying graphene has aided in the analysis of carbon nanotubes and fibers. The technique can also be used to track deformation in carbon-based materials and study interfacial micromechanics in composites.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Lei Shi, Ryosuke Senga, Kazu Suenaga, Johnny Chimborazo, Paola Ayala, Thomas Pichler
Summary: The recent achievement of confining carbyne in double-walled carbon nanotubes represents a major breakthrough in materials science, but controlling its properties remains a challenge. Researchers have successfully fabricated confined carbyne with tailored properties through localized photothermal heating and in-situ Raman spectroscopy. The evident interaction between the nanotubes and confined carbyne alters the tube's diameter, indicating a potential mechanism for tailoring the properties of the confined carbyne.
Article
Chemistry, Physical
Eunji Kim, Byeong-Joo Lee, Kathleen Maleski, Yoonjeong Chae, Yonghee Lee, Yury Gogotsi, Chi Won Ahn
Summary: This study presents a method for fabricating on-chip symmetric MSCs with coplanar interdigitated electrodes using focused-ion-beam process and carbon nanotube electrodes. The micro supercapacitors produced have high areal capacitance with narrow gaps between electrode fingers, while electron beam lithography and photolithography are utilized to create ultra-small footprint devices.
Article
Multidisciplinary Sciences
Thanh Luan Phan, Sohyeon Seo, Yunhee Cho, Quoc An Vu, Young Hee Lee, Dinh Loc Duong, Hyoyoung Lee, Woo Jong Yu
Summary: In this article, the authors introduce a robust method for fabricating vertical 1D-0D-1D vdWI memories with ultra-small junction areas. The memories exhibit high performance and are achieved through cross-stacking carbon nanotubes.
NATURE COMMUNICATIONS
(2022)
