Article
Chemistry, Physical
Xiaoping Yi, Xunliang Liu, Juan Fang, Hailong Huo, Ruifeng Dou, Zhi Wen, Wenning Zhou
Summary: In this study, the morphology evolution and electron transport pathway of (Li2O2)n on the surface of NCNTs were investigated. It was found that (Li2O2)n underwent a process of evolution from scattered small-sized clusters to filmlike and toroidal large clusters. The presence of pyridinic N3 and pyridinic N4 was effective in reducing the capacity loss caused by Li2O2 branches, which improved the deposition stability of (Li2O2)n. Additionally, (Li2O2)n with p-type semiconductor characteristics acted as a bridge between NCNTs for electron transfer.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Jaana Lilloja, Elo Kibena-Poldsepp, Ave Sarapuu, Anastasiia Konovalova, Maike Kaarik, Jekaterina Kozlova, Paarn Paiste, Arvo Kikas, Alexey Treshchalov, Jaan Aruvali, Andrea Zitolo, Jaan Leis, Aile Tamm, Vambola Kisand, Steven Holdcroft, Kaido Tammeveski
Summary: Transition-metal and nitrogen-doped graphene-like material and carbon nanotube composites are synthesized and utilized as cathode catalysts in anion exchange membrane fuel cells. The materials exhibit similar physicochemical properties and electrocatalytic performances with different yields of HO2- formation. The M-N-Gra/CNT catalysts, especially CoFe-N-Gra/CNT, combined with Aemion+ reinforced anion-exchange membrane, show excellent AEMFC performance comparable to that of Pt/C with a peak power density of 638 mW cm(-2), attributed to the presence of M-Nx sites, carbon-encapsulated transition-metal nanoparticles, and nitrogen-containing moieties.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Worawut Muangrat, Michiko Obata, Myo Than Htay, Masatsugu Fujishige, Paweena Dulyaseree, Winadda Wongwiriyapan, Yoshio Hashimoto
Summary: The hybrid nitrogen-doped graphene nanosheet-grafted double-walled carbon nanotube (NG-DWCNT) material was successfully synthesized by chemical vapor deposition (CVD) and thermal CVD techniques, exhibiting a sharp-edged petal-like structure and a higher specific capacitance value. This material has potential applications in electrochemical conversion and energy storage devices.
Article
Engineering, Environmental
Ahmed I. EL-Seesy, Mahmoud S. Waly, Hesham M. El-Batsh, Radwan M. El-Zoheiry
Summary: Nitrogen-doped multiwalled carbon nanotubes (N-doped MWCNTs) are effective catalysts that can improve diesel engine performance and reduce exhaust emissions. Adding N-doped MWCNTs to diesel fuel significantly enhances combustion behavior, engine performance, and exhaust emission analysis. It increases in-cylinder pressure and heat release rate, improves brake thermal efficiency, reduces brake specific fuel consumption, and significantly reduces NOx, soot, and CO formations in exhaust emissions compared to diesel and MWCNTs blends.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Chemistry, Multidisciplinary
Qian Zhang, Minying Wu, Yuanyuan Fang, Chao Deng, Hsin-Hui Shen, Yi Tang, Yajun Wang
Summary: In this study, Pt nanoparticles-loaded nitrogen-doped mesoporous carbon nanotube (Pt/NMCT) was successfully synthesized through a polydopamine-mediated one-pot co-deposition strategy. The loading process of Pt was studied and the catalytic performance of Pt/NMCT was investigated, showing the importance of the hierarchical pore structure for catalytic activity.
Article
Nanoscience & Nanotechnology
Shuiliang Wang, Zhequn Huang, Wenbo Shi, Dongwook Lee, Qixiang Wang, Wen Shang, Yosi Stein, Yang Shao-Horn, Tao Deng, Brian L. Wardle, Kehang Cui
Summary: This study demonstrates that amine-containing aromatic and cyclohexane molecules can effectively disperse single-walled carbon nanotubes (SWCNTs) in solvents, leading to stable dispersion at the single-tube level. The interaction between the amine group of the molecules and the pi bond of SWCNTs plays a crucial role in achieving excellent dispersibility and stability. Additionally, the enhanced thermal and electrical properties of SWCNT/epoxy nanocomposites through the introduction of these molecules provide a promising new approach for industrial applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Li Qiao, Runhao Zhang, Yuguo Li, Ran Xu, Yong Li, Dongwei Li, Meng Gao, Guanchen Xu, Meng Wang, Xiu Liang, Xingshuang Zhang, Qianqian Gu, Hongyu Gong, Kang Liang, Pu Chen, Biao Kong
Summary: In this study, stable 3D lithium metal anodes were prepared by growing N-doped carbon nanotubes on carbon cloth. The presence of carbon nanotubes effectively reduced the local current density and inhibited the formation of dendrites, leading to steady voltage curves and excellent cycle stability.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Composites
Afrooz Eshraghian, Milad Kamkar, Mohammad Asgari, Mohammad Arjmand, Uttandaraman Sundararaj
Summary: This study investigates the effect of functionalized nanoclay on the dielectric properties of synthesized nitrogen-doped carbon nanotube (N-CNT)/nanoclay/polyvinylidene fluoride (PVDF) nanocomposites prepared via melt-mixing in the X-band. The results show that the incorporation of nanoclay improved the dielectric properties, reduced dissipation factor, and expanded the percolation region of the N-CNT/PVDF nanocomposites. The addition of nanoclay also reduced the agglomeration area ratio and caused the collapse of N-CNT networks in the nanocomposites.
POLYMER COMPOSITES
(2021)
Article
Chemistry, Physical
Zhao Wang
Summary: This study used molecular dynamics simulations to investigate the physisorption behavior of hydrocarbon molecules on a covalent graphene-nanotube hybrid nanostructure. The results showed that the adsorbed molecules could diffuse into the nanotubes without external driving forces, due to variations in binding energy. Interestingly, the molecules remained trapped within the tubes even at room temperature, thanks to a gate effect observed at the neck region, overcoming the typical hindrance from concentration gradients. This passive mass transport and retention mechanism has implications for gas molecule storage and separation.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Engineering, Environmental
Sandya Rani Mangishetti, Daehee Jang, Junil Choi, Gaddam Rajeshkhanna, Suresh Pittala, Song Kyu Kang, Junhyuk Ji, Minho Kim, Seung Gyu Jung, Jungseub Ha, Jihoon Kim, Junbeom Maeng, Gwan Hyeon Park, Jaejin Bae, Won Bae Kim
Summary: Efficient fusion of components into hybrid nanostructures is crucial for obtaining electrode materials for supercapacitors. Two types of 3D graphene-based hybrid nanomaterials were synthesized and their microstructural properties were studied. These materials showed high specific capacitance and rate capability, making them promising for energy storage devices.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Xin Zhao, Li Qiu, Deyu Kong, Yangfei Huang, Jintao Liu
Summary: This study experimentally investigates the mechanical properties and microstructure of cementitious composites reinforced with a three-dimensional graphene-carbon nanotube hybrid. The results demonstrate that the addition of the hybrid improves the early hydration process and strength of the cement pastes.
Article
Chemistry, Analytical
Xoan F. Sanchez-Romate, Alberto Jimenez-Suarez, Monica Campo, Alejandro Urena, Silvia G. Prolongo
Summary: The electrical and electromechanical properties of hybrid graphene nanoplatelet (GNP)/carbon nanotube (CNT)-reinforced composites were analyzed under two different sonication conditions. The electrical conductivity increases with increasing nanofiller content, while the optimal sonication time decreases in a low viscosity medium. Samples with a higher GNP/CNT ratio show a higher prevalence of GNPs, with an exponential behavior of electrical resistance with applied strain and gauge factors reaching around 10.
Article
Electrochemistry
Yifan Zhang, Laifu Yang, Wenqiang Wang, Gengchao Wang
Summary: The coaxial heterostructure of LiNbO3 and NCNT was successfully achieved through in-situ nitrogen-doping and hydrothermal deposition, significantly enhancing the pseudocapacitive behavior of LiNbO3 and improving the cycle stability and capacity retention rate of the device.
ELECTROCHIMICA ACTA
(2022)
Article
Energy & Fuels
Chan Sic Kim, Rakesh Saroha, Jung Sang Cho
Summary: Hierarchically porous and conductive nanofibers were synthesized via electrospinning technique for enhancing the performance of lithium-sulfur batteries. The fibers consist of nitrogen-doped reduced graphene oxide, iron sulfide nanocrystals, and nitrogen-doped carbon nanotubes, providing structural integrity and fast electron transfer. The modified battery exhibited improved electrochemical properties, including reasonable rate capability and stable cycling performance.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Yining Jia, Chunjing Shi, Wei Zhang, Wei Xia, Ming Hu, Rong Huang, Ruijuan Qi
Summary: In this study, a catalyst of iron single atoms anchored on nitrogen-doped carbon matrix/ carbon nanotube hybrid supports was successfully prepared. It exhibits low cost, high selectivity, and high activity in the oxygen reduction reaction. The catalyst showed excellent activity and stability, making it a potential replacement for the latest commercial Pt/C catalyst.
Article
Chemistry, Multidisciplinary
Tian-Yi Luo, Prasenjit Das, David L. White, Chong Liu, Alexander Star, Nathaniel L. Rosi
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Editorial Material
Chemistry, Multidisciplinary
Alexander Star, Sean I. Hwang
ACS CENTRAL SCIENCE
(2020)
Article
Nanoscience & Nanotechnology
Wenting Shao, Michael R. Shurin, Sarah E. Wheeler, Xiaoyun He, Alexander Star
Summary: This study demonstrates the use of a high-purity semiconducting single-walled carbon nanotube field-effect transistor for rapid detection of SARS-CoV-2 antigens, displaying high sensitivity and specificity.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Xiaoyun He, Ilia Kevlishvili, Katherina Murcek, Peng Liu, Alexander Star
Summary: This study demonstrates a photoinduced cycloaddition reaction between enones and SWCNTs, leading to the generation of bright red-shifted photoluminescence by creating covalent and tunable defects in the carbon lattice of SWCNTs.
Article
Nanoscience & Nanotechnology
Zidao Zeng, Dan C. Sorescu, David L. White, Sean Hwang, Wenting Shao, Xiaoyun He, Zachary M. Schulte, Nathaniel L. Rosi, Alexander Star
Summary: A facile synthesis method of UiO-66-NH2 metal-organic framework (MOF)/oxidized single-walled carbon nanotubes (ox-SWCNTs) composite at room temperature was demonstrated in this work. DFT calculations were used to investigate the growth mechanism of the composites. The synthesized composites exhibited both microporosity of the MOF and electrical conductivity of the SWCNTs.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Biophysics
Long Bian, Zhunheng Wang, David L. White, Alexander Star
Summary: The research presents a method of utilizing machine learning techniques to create a calibration method for carbon nanotube sensors, successfully extending the dynamic range of analyte concentrations up to 12 orders of magnitude and further enhancing model performance. Functionalized nanosensors are also found to exhibit selective detection capability for Hg2+ ions.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
David L. White, Brian A. Day, Zidao Zeng, Zachary M. Schulte, Noah R. Borland, Nathaniel L. Rosi, Christopher E. Wilmer, Alexander Star
Summary: The hybridization of a 2-D metal organic framework with single-walled carbon nanotubes has allowed for discrimination of carbohydrates based on molecular size. Liquid gated field-effect transistor devices show improved differentiation capabilities for carbohydrates of varying sizes. Molecular Dynamics calculations reveal decreased ion diffusivity in the presence of different sugars, supporting the proposed sensing mechanism of gate capacitance reduction with carbohydrate molecules in the pores.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Sean Hwang, Hou-Yu Chen, Courtney Fenk, Michael A. Rothfuss, Kara N. Bocan, Nicholas G. Franconi, Gregory J. Morgan, David L. White, Seth C. Burkert, James E. Ellis, Miranda L. Vinay, David A. Rometo, David N. Finegold, Ervin Sejdic, Sung Kwon Cho, Alexander Star
Summary: Acetone, a metabolic byproduct found in exhaled breath, can be used to monitor ketosis levels. A chemiresistor made from oxidized single-walled carbon nanotubes functionalized with titanium dioxide was demonstrated to detect acetone in dried breath samples, showing linear correlation with other ketone bodies. The sensor had a detection limit of 1.6 ppm and a dynamic range of up to 100 ppm, making it suitable for ketosis detection in breath samples.
Article
Chemistry, Physical
Xiaoyun He, Dan C. Sorescu, Alexander Star
Summary: This study elucidated the chemical structures of MPO-catalyzed degradation products using liquid chromatography-mass spectrometry, providing a foundation for a general chemical formula screening workflow for GQDs and proposing structures responsible for blue PL - PMHs. The research indicated that structures with multiple conjugated benzene rings are likely to generate observed fluorescence.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Wenting Shao, Galina Shurin, Xiaoyun He, Zidao Zeng, Michael R. Shurin, Alexander Star
Summary: The new beta 2-Tf detection platform developed in this study offers a rapid and sensitive method for identifying CSF leakage, with the potential to be used as a rapid diagnostic tool. The three-step design, including affinity chromatography and a rapid sensing step using a semiconductor-enriched FET sensor, allows for shorter detection time and high sensitivity in body fluid tests.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Analytical
Zhengru Liu, Galina V. Shurin, Long Bian, David L. White, Michael R. Shurin, Alexander Star
Summary: In this study, a carbon nanotube sensor array was constructed to discriminate live and dead cells without labeling. By extracting different features and using linear discriminant analysis and support-vector machine algorithms, live and dead cells were accurately classified. After model optimization using recursive feature elimination with cross-validation, cells could be classified with high accuracy using only four features.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Zhengru Liu, Long Bian, Carl J. Yeoman, G. Dennis Clifton, Joanna E. Ellington, Rayne D. Ellington-Lawrence, Joanna-Lynn C. Borgogna, Alexander Star
Summary: This study demonstrates the potential of carbon nanotube field-effect transistors in the rapid diagnostics of bacterial vaginosis during pregnancy. The fabricated sensors can effectively detect BV-related factors and classify the samples using machine learning techniques.
ANALYTICAL CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Seth C. Burkert, Xiaoyun He, Galina Shurin, Yulia Nefedova, Valerian E. Kagan, Michael R. Shurin, Alexander Star
Summary: Carbon nanomaterials have been widely researched for various biomedical applications, with their ease of chemical functionalization, tunable length scales and morphologies, and ability to undergo enzymatic degradation making them ideal drug-delivery systems. Specific attention has been given to nitrogen-doped carbon nanotube cups (NCNCs) as drug-delivery systems for cancer therapy, with a focus on loading them with therapeutic cargo and targeted delivery. Additionally, gold nanoparticles have been synthesized on the NCNCs to create nanocarriers for delivering chemotherapeutic agents to myeloid regulatory cells in the tumor microenvironment.
ACS APPLIED NANO MATERIALS
(2022)
Article
Electrochemistry
Long Bian, Wenting Shao, Zhengru Liu, Zidao Zeng, Alexander Star
Summary: This work reports two types of selective cortisol sensors based on single-walled carbon nanotubes, and investigates the influence of nanomaterial interface on the biosensor performance by comparing their performance in artificial sweat.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Sean I. Hwang, Emmy M. Sopher, Zidao Zeng, Zachary M. Schulte, David L. White, Nathaniel L. Rosi, Alexander Star
Summary: In this study, the dynamic monitoring of hydrogen adsorption and desorption was achieved by growing the metal-organic framework HKUST-1 on palladium nanoparticle-functionalized single-walled carbon nanotubes. The addition of HKUST-1 significantly improved the sensitivity and detection limit of the nanocomposite material to hydrogen.
ACS APPLIED NANO MATERIALS
(2022)