Article
Physics, Condensed Matter
Meng Song
Summary: In this study, a simple method of dip-coating catalyst was used to prepare single walled carbon nanotube (SWCNT) cathodes for analyzing their field emission properties, with SWCNTMoCo cathodes demonstrating superior performance compared to SWCNTs prepared with other catalysts.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Nanoscience & Nanotechnology
Eunsol Go, Jae-Woo Kim, Jin-Woo Jeong, Sora Park, Jun-Tae Kang, Sunghoon Choi, Ji-Hwan Yeon, Yoon-Ho Song
Summary: This study investigates the influence of the supporting layer in carbon nanotube paste emitters on electron transport behavior. The diffusion-induced reaction and diffusion-limited reaction mechanisms under different annealing conditions are studied. The results show that the characteristics of the supporting layer affect the field electron emission performance of the carbon nanotube paste emitters, which in turn affects their temperature dependence.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Jianping Zou, Qing Zhang
Summary: Single-walled carbon nanotubes (SWCNTs) are considered a promising electronic material for the future of electronics, with sub-10 nm SWCNT-field effect transistors (FETs) outperforming Si-based FETs. Recent advances in SWCNT electronics focus on fundamental electronic structures, carrier transport mechanisms, and metal/SWCNT contact properties, highlighting subthreshold switching properties for low-power device operations. Challenges and prospects for future SWCNT-based electronics include material preparation, device fabrication, and large-scale ICs integration.
Article
Materials Science, Multidisciplinary
Wei Zhu, Weijin Qian, Ruizi Liu, Weijun Huang, Haijun Luo, Changkun Dong
Summary: Investigated the FEED properties of MWNT emitter in hydrogen and nitrogen environments. Found that gas adsorption can reduce the work function and shift the FEED peaks. The amount of spectrum displacements increased with higher gas partial pressures. The double peak spectra imply emission electrons from different carbon structures. Meanwhile, high carbon content was detected in the vacuum.
Article
Chemistry, Physical
Qianyu Ji, Bowen Wang, Yajuan Zheng, Xueping Yan, Fanguang Zeng, Bingheng Lu
Summary: The study introduces bulk graphene/carbon nanotubes hybrid materials for field emission applications, showcasing excellent stability and high efficiency. These bulk emitters are suitable for high-power cold cathode applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
Helin Zhu, Jejin Jang, Gyuwan Im, Hyungsoo Mok, Jehwang Ryu, Kyung-Seo Kim
Summary: Further studies on the suitability, dynamic characteristics, and applications of carbon nanotubes in high-frequency pulsing of X-rays are needed. This study analyzes the combined dynamics of field emission, MOSFET, and a modified gate driver for MOSFET, and proposes a modified gate driver structure to accurately control the tube current and enhance the dynamic current performance of carbon nanotube tubes.
Article
Chemistry, Multidisciplinary
Bishwa Chandra Adhikari, Bhotkar Ketan, Ju Sung Kim, Sung Tae Yoo, Eun Ha Choi, Kyu Chang Park
Summary: This study successfully achieved the goal of measuring the spot of high-density electron beams under the variation of voltage and exposure time by fabricating vertically aligned carbon nanotube emitters. By capturing microimages on a microchannel plate and analyzing the morphology structures using scanning electron microscopy, the researchers obtained measurements of the high-density electron beam and demonstrated that this configuration is applicable to high-resolution multi-beam electron microscopy and high-resolution X-ray imaging technology.
Article
Engineering, Multidisciplinary
Muthusamy Saranya, Janne T. Koivisto, Ana C. M. Carvalho, Fernando Sato, Andrea Lassenberger, Lionel Porcar, Baleeswaraiah Muchharla, Saikat Talapatra, Birgitte H. McDonagh, Lauriane Janssen, Olli Pitkanen, Minna Kellomaki, Krisztian Kordas, Gabriela S. Lorite
Summary: Injectable scaffolds are a promising strategy for tissue repair and regeneration. The design of an aligned injectable hydrogel-based scaffold via remote-induced alignment is reported in this study. The use of low magnetic field to align carboxylated multi-walled carbon nanotubes into the hydrogel is demonstrated, showing potential for engineering functional tissues with specific cell orientation.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Environmental
Ilya V. Novikov, Eldar M. Khabushev, Dmitry V. Krasnikov, Anton V. Bubis, Anastasia E. Goldt, Sergey D. Shandakov, Albert G. Nasibulin
Summary: The study focused on the impact of residence time on the growth of single-walled carbon nanotubes in aerosol CVD process, showing that the nucleation stage of nanotubes is controlled by diameter distribution rather than residence time. It was also observed a correlation between carbon nanotube length and residence time, and increasing residence time can effectively decrease the equivalent sheet resistance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Sung Tae Yoo, Kyu Chang Park
Summary: In this article, a novel method of EUV generation by irradiating Sn with electrons emitted from a carbon nanotube-based cold cathode electron beam was demonstrated. The intensity of EUV can be controlled by the number of emitted electrons. This method has significant implications for advanced lithography for semiconductor fabrication and high-resolution photonics.
Article
Materials Science, Multidisciplinary
Jiangtao Chen, Xinyao Chang, Shaodan Wu, Hui Ren, Yirun Zhu, Bingjun Yang, Yun Zhao, Jianbiao Chen, Yan Li
Summary: High performance cold cathodes based on carbon nanotubes (CNTs) are fabricated using a screen-printing method. The CNT cathode exhibits stable electron emission and the temperature-dependent emission is also investigated. Results show that the CNT emitters achieve a maximum emission current of 16.9 mA and a super-high current density of 562 mA cm-2 under continuous driving mode, and a peak current of 70 mA with a high current density of 2333 mA cm-2 under pulse driving mode. This work provides a new approach for designing double-high CNT cold electron sources for vacuum electronic devices requiring high current and density simultaneously.
Article
Chemistry, Analytical
Changkun Dong, Ruizi Liu, Jie Wang, Haipeng Yu, Song Kang, Weijun Huang, Weikang Jia, Weijin Qian
Summary: A novel low pressure helium sensing method using carbon nanotube field emission has been developed, showing promising applications in leak detection. By analyzing the field emission currents from multi-walled carbon nanotubes with low crystallinities, it was found that the work functions of CNT emitters remained consistent with helium adsorptions. The simulation results showed that adsorption of helium atoms on carbon atoms at defects enhanced the field emission current, enabling the detection of helium gas.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Materials Science, Multidisciplinary
Dandan Zhang, Yipeng He, Rumin Wang, Alan Taub
Summary: In this study, the kinetics of carbon nanotube (CNT) migration in an electric field were investigated. It was found that the migration rate of CNTs is linearly proportional to the electric field strength, while the CNT concentration and length distribution have minimal effects on the migration velocity. This relationship can be used to manipulate the spatial distribution of CNTs in polymer composites to enhance their mechanical, thermal, and electrical properties.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Analytical
QingYi Meng, Shuhua Wei, Zhiyuan Xu, Qiang Cao, Yushi Xiao, Na Liu, Huan Liu, Gang Han, Jing Zhang, Jiang Yan, Alexander P. Palov, Lidong Wu
Summary: This study improved the performance of SWCNT-FET sensors by introducing P4VP and HfO2, resulting in a high sensitivity and low detection limit for Cu2+, making it a promising choice for the future manufacturing of custom sensors.
ANALYTICA CHIMICA ACTA
(2021)
Article
Chemistry, Physical
Sicong Qiao, Qun He, Quan Zhou, Yuzhu Zhou, Wenjie Xu, Hongwei Shou, Yuyang Cao, Shuangming Chen, Xiaojun Wu, Li Song
Summary: This study demonstrates the significance of interface modulation in designing advanced electrocatalysts. By loading platinum on nickel nitride, a catalyst with highly exposed Pt(110) facets is obtained, which promotes the hydrogen evolution reaction. The catalyst exhibits significantly higher activity in acidic media compared to commercial catalysts, highlighting the potential of interface engineering in enhancing electrocatalytic performance.
Article
Chemistry, Physical
Kefu Zhu, Shiqiang Wei, Quan Zhou, Shuangming Chen, Yunxiang Lin, Pengjun Zhang, Yuyang Cao, Changda Wang, Yixiu Wang, Yujian Xia, Dengfeng Cao, Zeinab Mohamed, Xin Guo, Xiya Yang, Xiaojun Wu, Li Song
Summary: Transition metal selenides have received great attention due to their high theoretical capacity, but the fluctuation in volume during charge/discharge process leads to significant reduction in electrochemical performance. In this study, carbon-regulated copper(I) selenide (Cu2Se@C) is designed to enhance the stability and ion diffusion in selenide electrodes, resulting in improved storage kinetics. The experimental results show that the capacitance process plays a crucial role in the Cu2Se@C material.
Article
Engineering, Environmental
Beibei Sheng, Dengfeng Cao, Hongwei Shou, Wenjie Xu, Chuanqiang Wu, Pengjun Zhang, Chongjing Liu, Yujian Xia, Xiaojun Wu, Shengqi Chu, Jing Zhang, Li Song, Shuangming Chen
Summary: Recent research has shown that by tailoring the surface structure of the catalyst, significant improvements can be made in the performance of the oxygen evolution reaction in acidic conditions, leading to better efficiency and stability of CO2 electrolyzers.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Shunqiang Chen, Weiduo Zhu, Lijiang Tan, Digen Ruan, JiaJia Fan, Yunhua Chen, Xianhui Meng, Qingshun Nian, Xin Zhao, Jinyu Jiang, Zihong Wang, Shuhong Jiao, Xiaojun Wu, Xiaodi Ren
Summary: Ethers are potential electrolytes for lithium metal batteries due to their unique stability with Li metal. The solvation structure of the electrolyte plays a crucial role in the oxidation stability. In this study, a triglyme-based electrolyte with strong Li+ solvation energy exhibits improved stability on Ni-rich cathodes under an ultrahigh voltage. This research provides critical insights into the solvation structure dynamics and its significant impact on the interfacial stability for the development of high-efficiency electrolytes for high-energy-density lithium metal batteries.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Yangyan Gao, Xin He, Keke Mao, Christopher K. Russell, Sam Toan, Aron Wang, TeYu Chien, Fangqin Cheng, Armistead G. Russell, Xiao Cheng Zeng, Maohong Fan
Summary: Commercial single-walled carbon nanotubes (CNTs) were activated with nitric acid and urea under ultrasonication and hydrothermal methods, respectively, to prepare N-doped CNTs with -COOH functional groups. The chemically modified CNTs catalyze both CO2 sorption and desorption, with significant increases in desorption rate compared to the sorbent without the catalyst.
Article
Chemistry, Multidisciplinary
Yuan Liu, Jian Jiang, Yangyang Pu, Joseph S. Francisco, Xiao Cheng Zeng
Summary: The study investigates the freezing transition of water confined in double-walled carbon nanotubes using large-scale molecular dynamics simulations. The results show that water can spontaneously form single-walled ice nanotubes with diameters up to 10 nm. Three different types of ice nanotubes are observed. Ab initio molecular dynamics simulations are also performed to examine the stability of the ice nanotubes.
Article
Chemistry, Multidisciplinary
Linqin Zhu, Kangli Xu, Yanyan Fang, Xiaojun Wu, Li Song, Yongchun Zhu, Yitai Qian
Summary: Red phosphorus has great potential as an anode material for Na batteries, and the synthesis of 1D red phosphorus using selenium-induced method can significantly improve its performance. The fibrous nano red phosphorus obtained through this method exhibits excellent rate performance and cycle stability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qun Ji, Yilei Wu, Xinying Gao, Tingbo Zhang, Yipeng Zhou, Yehui Zhang, Ming-Gang Ju, Jinlan Wang, Xiao Cheng Zeng
Summary: Tin organic-inorganic halide perovskites (tin OIHPs) have a desirable band gap and their power conversion efficiency (PCE) has reached 14%. It was previously believed that the organic cations in tin OIHPs had little impact on the optoelectronic properties. However, we found that defective organic cations with randomly dynamic characteristics do have a significant effect on the optoelectronic properties of tin OIHPs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Biwu Chu, Yuan Liu, Hao Li, Yongcheng Jia, Jun Liu, Qing Cao, Tianzeng Chen, Peng Zhang, Qingxin Ma, Xiao Cheng Zeng, Joseph S. Francisco, Hong He
Summary: Using a flow tube reactor, it was discovered that N2O5 can be released from the TiO2 surface during the photocatalytic oxidation of NO2, which provides a previously unreported source of N2O5. The release rate of N2O5 from TiO2 depends on various factors including the initial NO2 concentration, relative humidity, O-2/N-2 ratio, and irradiation intensity. Experimental and theoretical studies show that this release is due to the reaction of NO2 with surface hydroxyl groups and electron holes on TiO2, followed by its combination with another NO2 molecule to form N2O5.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Yijie Niu, Kai Zhang, Xuefeng Cui, Xiaojun Wu, Jinlong Yang
Summary: Based on first-principles calculations, a family of stable 2D iron silicide alloys has been discovered. These nanosheets exhibit ferromagnetic and electronic properties, making them promising for spintronics applications at the nanoscale.
Article
Multidisciplinary Sciences
Yixiu Wang, Shiqiang Wei, Zheng-Hang Qi, Shuangming Chen, Kefu Zhu, Honghe Ding, Yuyang Cao, Quan Zhou, Changda Wang, Pengjun Zhang, Xin Guo, Xiya Yang, Xiaojun Wu, Li Song
Summary: In this study, NH4+-intercalated vanadium oxide (NH4+-V2O5) is designed as a cathode material for high-rate ZIBs. The insertion of NH4+ promotes electron transition to the 3dxy state of V t2g orbital in V2O5, leading to accelerated electron transfer and Zn-ion migration.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Haifeng Lv, Caiyun Chen, Wenbin Li, Zhiwen Zhuo, Peng Cheng, Yi-Qi Zhang, Baojie Feng, Kehui Wu, Xiaojun Wu, Lan Chen
Summary: In this study, unique B5 clusters were successfully formed on a monolayer borophene (MLB) on a Cu(111) surface using molecular beam epitaxy and scanning tunneling microscopy experiments. The B5 clusters selectively bind to specific sites of MLB with covalent boron-boron bonds in a periodic arrangement. The close-packed adsorption of B5 clusters facilitates the synthesis of bilayer borophene, exhibiting a domino effect-like growth mode. The successful growth and characterization of uniform boron clusters on a surface enrich the boron-based nano-materials and reveal the essential role of small clusters during the growth of borophene.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Yuzhu Zhou, Quan Zhou, Hengjie Liu, Wenjie Xu, Zhouxin Wang, Sicong Qiao, Honghe Ding, Dongliang Chen, Junfa Zhu, Zeming Qi, Xiaojun Wu, Qun He, Li Song
Summary: Developing efficient electrocatalysts for selective CO2 conversion is important. In this study, the authors demonstrate that a Ni single-atom catalyst coordinated with pyrrolic nitrogen and pyridinic nitrogen efficiently converts CO2 to CO. The catalyst shows high CO partial current density and turnover frequency, as well as excellent Faradaic efficiency of CO. The study also provides insights into the origin of the catalyst's catalytic activity.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Yan Gao, Kai Zhang, Zhou Lu, Xiaojun Wu
Summary: This study investigates the tuning of electronic structure and optimization of power conversion efficiency (PCE) in two-dimensional hybrid organic-inorganic perovskites (HOIPs). By combining fluorination and conjugation engineering, type IIa band alignment and tunable bandgaps are achieved in 2D Dion-Jacobson (DJ) HOIPs. The results show that the bandgap of 2D DJ-HOIPs decreases with an increase in the number of F atoms, leading to improved PCE in solar cells.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Ning Lu, Xin Hu, Jiaxin Jiang, Hongyan Guo, Gui Zhong Zuo, Zhiwen Zhuo, Xiaojun Wu, Xiao Cheng Zeng
Summary: In this study, the structural stability and electronic properties of point defects in α-antimonene were investigated through first-principles calculations. Compared to analogs like phosphorene, graphene, and silicene, most defects in α-antimonene can be easily generated. Among the nine types of point defects, the single vacancy SV-(5|9) is likely the most stable, with a concentration higher than that in phosphorene. Additionally, the vacancy exhibits low diffusion barriers in the zigzag/armchair direction.