Article
Chemistry, Physical
Zhengcheng Wang, Shangyan Zhou, Wei Liao, Qingmei Wang
Summary: In this study, PtCo alloys catalysts supported on multiwalled carbon nanotubes (MWCNTs) were prepared with improved methanol oxidation reaction (MOR) properties and anti-CO poisoning ability. The Pt1Co3@NC/MWCNTs sample with moderate Co2+ feeding content showed a 1.93-fold enhancement in MOR mass activity compared to commercial Pt/C catalyst. Additionally, it displayed a lower CO oxidation onset potential. The improvements in MOR activity, durability, and anti-CO poisoning ability were attributed to the moderate surface compositions, optimal electronic interaction, and the protection of N-doped carbon (NC) shells. This study provides a new direction for the design and fabrication of highly efficient electrocatalysts for DMFCs applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Lielie Liu, Shuyue Xie, Ruxangul Jamal, Tursun Abdiryim, Abdukeyum Abdurexit, Dongna Zou, Haile Liu, Yanyan Song
Summary: In this study, a facile method was used to prepare RuCoOx/N-CNT catalyst composited with PEDOT-SH and supported Pt nanoparticles (Pt NPs) for methanol oxidation reaction (MOR). The introduction of RuOx into CoOx in RuCoOx/N-CNT can generate a large number of oxygen vacancies, which serve as highly active centers and improve the hydrophilicity of catalysts, promoting the redox reaction kinetics. The structural characterizations confirm the presence of alloying and charge redistribution in RuCoOx/N-CNT@PEDOT-MeSH/Pt, and the oxygen vacancies effectively change the electronic structure and increase the density of active sites, enhancing MOR activity. Performance tests show that RuCoOx/N-CNT@PEDOTMeSH/Pt exhibits superior electrocatalytic activity (2003.3 mA mg-1Pt) compared to RuCoOx/N-CNT/Pt (1324.8 mA mg-1Pt) and commercial Pt/C (279.6 mA mg-1Pt) catalysts. This strategy provides a scheme for designing high-performance, low-cost anode catalysts in MOR.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Kevin Laughlin, Richard R. Vanfleet, Robert C. Davis
Summary: Researchers have developed VACNT/carbon composite films with higher stiffness and strength than pure VACNTs, while maintaining low reflectance. These composites can withstand water exposure and handling, making them a promising material.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Emily Schifano, Gianluca Cavoto, Francesco Pandolfi, Giorgio Pettinari, Alice Apponi, Alessandro Ruocco, Daniela Uccelletti, Ilaria Rago
Summary: The emergence of multidrug-resistant bacteria is a growing threat to public health, necessitating the development of non-antibiotic antibacterial approaches. In this study, vertically aligned carbon nanotubes (VA-CNTs) with controlled nanomorphology were proposed as effective platforms for bacteria eradication. Through a combination of microscopic and spectroscopic techniques, the topography of VA-CNTs was tailored in a controlled and time-efficient manner using plasma etching processes. The highest reduction in cell viability was observed for VA-CNTs modified using plasma etching with Ar and O-2, indicating their potential as a surface for inactivating both planktonic and biofilm infections.
Article
Chemistry, Physical
Emeline Charon, Mathieu Pinault, Martine Mayne-L'Hermite, Cecile Reynaud
Summary: The one-step aerosol-assisted catalytic chemical vapor deposition (CCVD) process, operated in a H-2-based carrier gas, can efficiently prepare forests of vertically aligned multiwalled carbon nanotubes (VACNTs) with high purity and good crystalline level at extremely low ferrocene content. The iron content in the VACNT sample is proportional to the ferrocene concentration in the precursor, while reducing the ferrocene concentration leads to a decrease in VACNT number density and an increase in growth rate with similar CNT diameters and crystalline structure, indicating high oxidation resistance.
Article
Engineering, Biomedical
Luis Nascimento, Cristiana Fernandes, Ricardo. M. Silva, Angela Semitela, Barbara M. de Sousa, Paula A. A. P. Marques, Sandra I. Vieira, Rui. F. Silva, Nathalie Barroca, Gil Goncalves
Summary: A novel therapeutic approach based on carbon nanotubes (CNTs) is explored in this study to enhance the regeneration of neural cells. Different morphologies of CNTs are created and tested for their ability to stimulate the formation of neurons and networks. The findings provide a new avenue for the construction of electroresponsive scaffolds for neural tissue engineering.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Chemistry, Applied
Qing Hao Meng, Chao Hao, Bowen Yan, Bin Yang, Jia Liu, Pei Kang Shen, Zhi Qun Tian
Summary: Fabrication of PEMFCs with order-structured cathodic electrodes was achieved by depositing Pt nanoparticles onto vertically aligned carbon nanotubes (VACNTs) grown on Al foil, resulting in improved power output and durability. The proportion of hydrophilic Pt-deposited region and the residual hydrophobic region of VACNTs without Pt strongly influenced the cell performance, especially at high current densities. The optimized structure showed the highest performance at a Pt loading of 50 gg cm-2 and a VACNTs length of 4.6 gm.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Review
Nanoscience & Nanotechnology
August Kohls, Mackenzie Maurer Ditty, Fahimeh Dehghandehnavi, Si-Yang Zheng
Summary: Vertically aligned carbon nanotubes (VACNTs) have numerous advantages that make them highly desirable in biomedical applications. This review discusses the utilization of VACNTs in sensing, biomolecule filtration systems, cell stimulation, regenerative medicine, drug delivery, and bacteria inhibition, and compares them to the traditionally nonaligned, randomly oriented nanotubes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Chaminda P. Nawarathne, Abdul Hoque, Chethani K. Ruhunage, Connor E. Rahm, Noe T. Alvarez
Summary: This study presents a method for achieving chemical bonding of CNTs to metal substrates at low temperatures, bypassing the need for high temperature treatments, and successfully establishing direct connections between CNTs and metal substrates. By functionalizing metal substrates with organic species and carefully controlling the process, successful chemical bonding between CNTs and metal substrates was achieved, opening up new possibilities for electronic applications.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Yunqi Yu, Jianting He, Tong Wang, Xinsheng Qiu, Kangcheng Chen, Qin Wu, Daxin Shi, Yaoyuan Zhang, Hansheng Li
Summary: Nitrogen-doped carbon nanotubes (N-CNTs) prepared by carbonization of polypyrrole nanotubes (PPy-NTs) are used as supports for Pt-CeO2/N-CNTs electrocatalysts. The effects of preparation conditions on the structure and electrocatalytic activity of the electrocatalysts for methanol oxidation were investigated. The Pt-CeO2/N-CNTs electrocatalysts prepared with N-CNTs calcined at 700°C as a support and 15 mM alkali concentration exhibited the largest electrochemical active area and methanol oxidation mass activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Analytical
Haoye Wang, Yun Yang, Yihan Ren, Duangui Chen, Jianhong Wei, Lu Wang, Aijuan Xie, Shiping Luo
Summary: This study synthesized zirconia supported on multi-walled carbon nanotubes via hydrothermal method, and then prepared ternary Pt-ZrO2/MWCNTs hybrid through electrodeposition to enhance electrocatalytic activity and stability for methanol oxidation. Results showed that the Pt-ZrO2/MWCNTs hybrid exhibited better conductivity and toxicity resistance compared to commercial catalysts, and had a higher specific surface area.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Jiaxin Li, Yajun Chang, Dongze Li, Ligang Feng, Baogang Zhang
Summary: The efficient synergism between high valence state V and Pd nanoparticles enhances their catalytic performance and anti-poisoning ability for alkaline methanol electrooxidation.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Da-Chi Yang, Richard J. J. Castellano, Ricardo Prada Silvy, Sathish K. K. Lageshetty, Robert F. F. Praino, Francesco Fornasiero, Jerry W. W. Shan
Summary: This study reports on the first macroscopic membranes with vertically oriented, subnanometer carbon nanotube (CNT) pores, which show enhanced water flow. The membranes, made using a scalable, solution-based method, exhibit fast pressure-driven water transport with up to 10^5-fold enhancement compared to conventional flow. The results also show that the hydrodynamic slip lengths increase with decreasing nanotube diameter, suggesting that water transport in small-diameter CNTs is dominated by entrance resistance.
Article
Chemistry, Physical
A. Andalouci, Y. Roussigne, L. Gangloff, P. Legagneux, S. Farhat, S. M. Cherif
Summary: In this study, vertically aligned multiwalled carbon nanotubes (MWCNTs) filled with Co magnetic nanowires were synthesized in a one-step process using bias-assisted plasma enhanced chemical vapor deposition (PECVD) method. The growth, alignment, and filling of the carbon nanotubes were achieved simultaneously by applying a negative bias to the substrate. The structural investigations revealed the growth mechanisms, and the analysis confirmed the presence of Co, Pd, C, N, and O in the nanotubes. The hysteresis cycles exhibited ferromagnetic behavior, with higher coercive field values observed for nail-shaped Co nanoparticles embedded in the CNTs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
Shuyue Xie, Fangfei Liu, Tursun Abdiryim, Xiong Liu, Ruxangul Jamal, Yanyan Song, Mariyam Niyaz, Yajun Liu, Hujun Zhang, Xinsheng Tang
Summary: In this study, platinum-palladium bimetallic nanoparticles were successfully loaded onto poly(3,4-ethylenedioxythiophene) (PEDOT)-embellished titanium carbide nanosheets through a facile and rapid chemical reduction-assisted one-pot hydrothermal process. The resulting Ti(3)C(2)Tx/PEDOT/Pt-Pd catalyst demonstrated excellent electrocatalytic activity for the methanol oxidation reaction (MOR), with a larger electrochemical activity surface area and higher mass activity compared to other catalysts. The hybrid structure formed between PEDOT and Ti(3)C(2)Tx provided a sizable active surface and more active sites, enhancing the dispersion of Pt-Pd NPs and facilitating mass transfer. The Schottky junctions between PEDOT and Pt-Pd NPs contributed to charge transfer, while the electronic effects and synergistic interactions between the support and catalyst favored the catalytic activity.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Alaauldeen A. Duhduh, Chou-Yi Hsu, Mustafa Humam Sami, Anupam Yadav, Russul Thabit, Sagr Alamri, Abdelmajeed Adam Lagum, Ali A. Rajhi
Summary: Density functional theory (DFT) calculations were used to investigate the application of a Zn12O12 nanocage as an anode material in Na-ion batteries (NIBs). The pure nanocage showed low performance, but encapsulating a chloride led to a significant increase in voltage, surpassing carbon nanotubes and C24 fullerene.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Hiroyuki Ikemoto, Toshihiko Fujimori, Takafumi Miyanaga, Reo Kawaguchi, Koki Urita, Masao Tabuchi
Summary: This study investigated the structures of two Se chains confined inside single-walled carbon nanotubes (SWCNTs), revealing that the chains were linear and parallel. The covalent bond between Se and SWCNT was found to be stronger than that between Se and trigonal Se (t-Se). The interaction between chains was attributed to the overlap of electronic orbitals, and the disappearance of this overlap in the encapsulated Se chains enhanced the covalent bonds.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Suman Yadav, Atul Gour, Sadhna Singh
Summary: In this study, we investigated the electronic and thermoelectric properties of rare-earth half-Heusler XPtBi (X = Gd, Nd, Y) topological semimetals compounds using density functional theory. Our results indicate that the inclusion of spin orbit coupling has a significant impact on the electronic band structure and spin order, making it promising for spintronic applications. We found different topological states in these compounds and observed enhanced power factor in YPtBi with the inclusion of SOC.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Takahiro Ozawa, Hiroshi Nakanishi, Koichi Kato, Ryota Shimizu, Taro Hitosugi, Katsuyuki Fukutani
Summary: In this study, we elucidate the hopping mechanism of hydrogen at intermediate temperature using a combination of experimental data and theoretical calculations. We find that the transition from thermal hopping to quantum tunneling is attributed to resonant tunneling, which is achieved through the resonant tunneling of discrete vibrational states between the edge octahedral site and the tetrahedral site. We also demonstrate that the tunneling rate can be tuned by energy level matching.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Ankita Nandi, Ritam Mehera, Moumita Mandal, Paramesh Chandra, Swapan K. Mandal, Naznin Ara Begum, Chandan K. Jana, Nilanjana Das
Summary: In this study, stable biogenic ZnO nanoparticles were successfully synthesized using a biosynthesis method, and their effects on oxidative stress parameters in Saccharomyces cerevisiae were investigated. The results demonstrate that high concentrations of ZnO nanoparticles may induce oxidative stress conditions, suggesting caution in their extensive use.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
P. S. Dighe, A. A. Bhoite, V. L. Patil, N. L. Tarwal, P. B. Sarawade
Summary: In this study, Ni-Co layered double hydroxide (LDH) nanocomposites with excellent electrochemical properties were prepared using hydrothermal technique. The as-obtained material exhibited high specific capacitance and remarkable energy density, showing great potential for supercapacitor applications.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Muhammad Danish, Misbah ul Islam, Farooq Ahmad, M. Nadeem Madni, M. Jahangeer
Summary: This study synthesized M-type hexaferrite and graphene oxide using sol-gel auto-combustion and modified Hummer process. The structure and morphology of the materials were characterized by XRD and SEM. The experimental results showed that coupling magnetic ferrite with graphene oxide can tune the electromagnetic properties of the materials, with potential applications in various fields.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Abrar U. Hassan, Yuchuan Li
Summary: This study presents a new design strategy of N-doped fused ring electron acceptors for organic dye Y123 in photovoltaic and optical devices. The evaluation of five novel dyes shows their positive contributions to charge transfer. Impressive photovoltaic performance is observed in one of the dyes, with high light harvesting efficiency and maximum power output.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Ashvin Kanzariya, Shardul Vadalkar, Sourav Kanti Jana, L. K. Saini, Prafulla K. Jha
Summary: Graphene quantum dots (GQDs) with quantum confinement and size effects show great potential for sensing applications. This computational study investigates the adsorption performance of pristine and transition metal-doped coronene GQDs to hazardous gases. The results suggest that doping with chromium (Cr) or nickel (Ni) enhances the gas adsorption performance, with Cr-doped GQDs showing strong interaction with gas molecules and potential as a gas remover, and Ni-doped GQDs showing potential as a CNCl sensor.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Vladimir V. Poborchii, Victor A. Sachkov, Alexander A. Shklyaev, Alexander V. Fokin, Pavel I. Geshev
Summary: This study investigates the polarized optical absorption and Raman spectra of -5 nm diameter tellurium nanowires confined in chrysotile asbestos nanotubes. The results show a strong interaction between the nanowires and light polarized parallel to the nanowires, while a weaker interaction is observed for light polarized perpendicular to the nanowires. This has significant implications for photonic and photo-electric applications.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Stanislav Cichon, Frantisek Maca, Vaclav Drchal, Katerina Horakova, Irena Kratochvilova, Jan Lancok, Vladimir Chab, Patrik Cermak, Jiri Navratil, Cestmir Drasar
Summary: In this study, a reliable method for preparing high-quality single crystal substrates doped with Bi2Se3 was developed. The electronic properties and chemical states of atoms in the substitutional position and native defects in the topological insulator were analyzed using experimental and theoretical methods. The relationship between the position of the Dirac cone and valence band maximum was explored and discussed.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Ikkurthi Kanaka Durga, Dasha Kumar Kulurumotlakatla, Tholkappiyan Ramachandran, Yedluri Anil Kumar, D. Amaranatha Reddy, K. V. G. Raghavendra, Asma A. Alothman, Sunkara Srinivasa Rao
Summary: Nickel molybdate oxide and tungsten trioxide have potential as electrode materials for supercapacitors, but their poor conductivity and fast capacitance fading limit their performance. By building a hierarchical nanoflower structure, the electrochemical performance of the supercapacitor is enhanced.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Elnaz Saadinia, Mohammad Almasi Kashi, Amir H. Montazer
Summary: Fe-based nanowires containing nonmagnetic elements, fabricated using a pulse electrodeposition method in porous anodic alumina membranes, exhibit magnetic tunability. The magnetic properties of Fe100-xSnx NW arrays, with a diameter of about 35 nm, such as coercivity and squareness values, decrease with increasing Sn content. The structure of the FeSn NWs, dominated by Fe or FeSn alloy crystal phase, can be either single domain or pseudo-single domain states depending on the Sn content.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Xinkai Liu, Tingting Liu, Yuanliang Zhou, Jing Wen, Jinmei Dong, Chenggong Chang, Weixin Zheng
Summary: CuS-Mg/S-BC composites modified by one-pot sulfurization exhibited higher removal efficiency in adsorption and photocatalytic removal of dyes, thanks to the functional groups and vacant sites formed at the interface for enhanced adsorption and photon capture.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Chemistry, Multidisciplinary
Yixing Hao, Fang Zhu, Hao Cheng, Sridhar Komarneni, Jianfeng Ma
Summary: A magnetic porous composite catalyst synthesized from CoFe2O4 and CuS showed high degradation efficiency for organic pollutants under visible light conditions, using non-radical degradation as the main pathway.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)