Article
Chemistry, Multidisciplinary
Xueying Chang, Cheng-Wei Lin, Ailun Huang, Maher F. El-Kady, Richard B. Kaner
Summary: Through laser scribing technique, short-chain aniline trimers (ATs) and carbon nanotubes (CNTs) were covalently bonded using amide covalent linkages, resulting in a covalently coupled AT/CNT (ccAT/CNT) composite. The ccAT/CNT composite exhibited excellent cycling and rate performance, retaining 80% of its original capacitance after 20,000 charge/discharge cycles. This molecular design approach enabled by laser irradiation provides a feasible pathway towards robust advanced energy storage devices.
Article
Polymer Science
Xueying Chang, Zhiyin Yang, Ailun Huang, Yuto Katsuyama, Cheng-Wei Lin, Maher F. El-Kady, Chenxiang Wang, Richard B. Kaner
Summary: Research has shown that the cycling stability of composite electrodes based on aniline trimers and carbon nanotubes can be enhanced by establishing covalent bonding between the two materials. Additionally, higher porosity improves electron/ion transfer and the ability to adapt to volumetric changes, resulting in higher conductivity and extended cycle life.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Victor H. R. Souza, Ariane Schmidt, Aldo J. G. Zarbin
Summary: Obtaining a wide color gamut and controllable color switching of electrochromic polymers (ECPs) is crucial for advanced applications. In this study, a multicolor palette of ECPs based on thin and transparent films of three ordinary conducting polymers was developed. Thirteen distinct colors were prepared by stacking the films in different combinations and numbers of layers, and their electrochromic properties were demonstrated.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Engineering, Electrical & Electronic
Umesh Somaji Waware, Mohd Rashid, A. M. S. Hamouda, Rohana Adnan, G. J. Summers
Summary: The uniform dielectric permittivity and frequency-dependent ac conductivity of hollow and porous semiconducting copolymer poly(aniline-co-m-hydroxyaniline) (PA-co-m-HA)s were studied using various techniques including electrochemical impedance spectroscopy, electronic spectroscopy, X-ray diffraction, and cyclic voltammetry. The copolymer exhibited globular and porous morphology, reduced crystallinity, and blue-shift in optical spectra.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
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
Chemistry, Multidisciplinary
Munziya Abutalip, Guldana Zhigerbayeva, Dana Kanzhigitova, Perizat Askar, Yelriza Yeszhan, Tri Thanh Pham, Salimgerey Adilov, Rafael Luque, Nurxat Nuraje
Summary: In recent decades, there has been a growing interest in conducting polymers for their broad applications. However, the techniques for producing 2D nanosheets of conducting polymers are either complex or expensive, and a comprehensive approach for constructing 2D and 3D materials or their composites has not been documented. In this study, a simple and scalable synthetic protocol was developed to design 2D, 3D, and related conducting polymer nanocomposites. Diverse bicontinuous thin layers of oil and water were used to produce 2D nanosheets, and specially designed linkers were applied to lock the 3D networks of the conducting polymers and their composites. This technique is cost-effective and easily scalable, and it achieved the highest reported electrical conductivity for 2D PPY nanosheets to date.
ADVANCED MATERIALS
(2023)
Article
Polymer Science
Young-Gi Kim, Hai-Long Nguyen, Patrick Kinlen
Summary: The study identified secondary dopants and doping methods crucial for increasing the electrical conductivity of polyaniline. The use of secondary film doping method and p-toluenesulfonic acid led to a significant increase in the electrical conductivity of the doped polyaniline. A novel vapor annealing doping method was also developed to introduce secondary dopants into solution cast polyaniline films.
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, Physical
Mehdi Rouhani, Jonathan Hobley, Franklin Chau-Nan Hong, Yeau-Ren Jeng
Summary: The study found that Si-doped hydrogenated amorphous carbon films were stable up to 600 degrees Celsius, beyond which carbon atoms started to evaporate from the surface. Raman data strongly supported the XPS conclusions. At 750 degrees Celsius, the surface of the film showed optical differences and cracks.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Peiyu Tan, Feifei Lu, Yuge Han
Summary: Poly(3,4-ethylenedioxythiophene) (PEDOT) is an excellent electrochromic material with inherent infrared (IR) electrochromic properties, making it promising for intelligent IR thermal management. This study investigates the mechanism underlying the IR electrochromic performance of PEDOT by employing eight common dopants and in situ electrochemical deposition. The results show that the delocalization of polarons and bipolarons on PEDOT chains is related to the positively polarized sulfur atoms in the thiophene rings, which determines the reflectance regulation of PEDOT films. The diverse IR control capabilities of different doped PEDOT devices mainly result from the variation in charge carrier concentration in the oxidized state.
CHEMISTRY OF MATERIALS
(2023)
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
Polymer Science
Guanyi Hou, Yingxue Hao, Ruifeng Jiang, Sai Li, Yonglai Lu, Jun Liu, Liqun Zhang, Krzysztof Matyjaszewski
Summary: The rapidly developing aerospace industry has a severe requirement for rubber components utilized for spacecraft, especially the resistance to extreme temperature differences because of the complex space environment. However, it is difficult to increase the service temperature range of the existing elastomeric materials based on traditional methods. By introducing a new type of long-side chain siloxane, a novel silicone elastomer with an unprecedented wide temperature range (-149-400°C) is designed, which does not introduce other heteroatoms.
Article
Materials Science, Multidisciplinary
Zhenzhen Zhao, Wei Zhang, Miao Liu, Dong Wang, Xiyang Wang, Lirong Zheng, Xu Zou, Zizhun Wang, Dabing Li, Keke Huang, Weitao Zheng
Summary: The interaction between electrode materials and charge carriers is crucial for energy storage mechanisms. In this study, a weak and reversible Fe-N interaction was introduced and utilized to address the volume changes during intercalation or formation. X-ray absorption spectroscopy confirmed the balanced Fe-N interaction between the nitrogen of ammonium ions and high-spin Fe in FeHCF. The resulting material exhibited stable energy storage and high-rate performance.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Physical
Lifei Liu, Jianling Zhang, Xiuyan Cheng, Mingzhao Xu, Xinchen Kang, Qiang Wan, Buxing Han, Ningning Wu, Lirong Zheng, Chenyan Ma
Summary: An amorphous MOF catalyst (NH2-MIL-68) with a large number of open metal sites, basic building blocks of crystalline NH2-MIL-68, and hierarchically meso- and microporous structure shows high activity in electrocatalytic reduction of CO2 and photochemical cycloaddition of CO2.
Article
Chemistry, Physical
Shenghua Ye, Shuhua Xie, Yaqi Lei, Xiuyuan Yang, Jing Hu, Lirong Zheng, Zhida Chen, Yonghuan Fu, Xiangzhong Ren, Yongliang Li, Xiaoping Ouyang, Qianling Zhang, Jianhong Liu, Xueliang Sun
Summary: In this study, dual-metal atomic pairs of Mn-Fe binuclear sites anchored onto a graphite-like structure were constructed. The strong short-range electronic interaction between Mn and Fe sites in the binuclear structure transforms Fe sites to a high spin state, improving the oxygen reduction reaction performance of the Mn-Fe structure.
Article
Chemistry, Multidisciplinary
Heng Li, Mengru Sun, Hongfei Gu, Juan Huang, Guo Wang, Renjian Tan, Rufen Wu, Xinyu Zhang, Shuhu Liu, Lirong Zheng, Wenxing Chen, Zhengbo Chen
Summary: In this study, a dual-channel nanozyme-based colorimetric sensor array is developed for identifying seven preservatives in food. The peroxidase-like FeCoZn triple-atom catalyst enables the oxidation of TMB and OPD in the presence of H2O2, producing distinct color changes. The adsorption of food preservatives on the nanozyme surface leads to differential catalytic activity and unique colorimetric fingerprints.
Article
Chemistry, Physical
Yuanfei Song, Shaoxia Weng, Fan Xue, Alan J. McCue, Lirong Zheng, Yufei He, Junting Feng, Yanan Liu, Dianqing Li
Summary: In this study, a synthesis approach for preparing catalysts with shape-controlled Al2O3 supports containing coordinatively unsaturated Al3+ centers is reported. These centers induce ordering in bimetallic catalysts through a simple impregnation strategy, benefiting the selective hydrogenation of acetylene. The use of nanorod Al2O3 results in a highly homogeneous and ordered Ni1Cu1 nanoalloy, attributed to the coordination effect of unsaturated Al3+ sites that promote atomic diffusion and ordering. The obtained Ni-Cu/Al2O3-rod catalyst shows both satisfactory activity and ethylene selectivity, outperforming most reported Ni-based catalysts.
Article
Chemistry, Physical
Yanwei Cao, Yao Peng, Danyang Cheng, Lin Chen, Maolin Wang, Cheng Shang, Lirong Zheng, Ding Ma, Zhi-Pan Liu, Lin He
Summary: This study reports a highly selective Au/ZnO composite catalyst for one-step oxidative coupling of carbon monoxide (CO) with secondary amines, producing oxamides. The reaction is >99% selective under ambient conditions, and the catalyst activity shows a subtle change over approximately 120 hours. Microscopic and spectroscopic studies, along with machine learning, reveal that the active site is the Au-ZnO interface with a Au nanocluster attached to the ZnO support via nonstoichiometric ZnOx (x > 1) linkages. The reaction mechanism and key reaction intermediates were confirmed by density functional theory calculations and in situ diffused reflectance infrared Fourier transform spectroscopy signals. Our results open up a new avenue in heterogeneous catalysis to achieve ambient-condition CO transformation by exploiting interfacial synergistic effects.
Article
Nanoscience & Nanotechnology
Ulrika Boda, Jan Strandberg, Jens Eriksson, Xianjie Liu, Valerio Beni, Klas Tybrandt
Summary: High-throughput production methods, such as screen printing, can bring stretchable electronics out of the lab and into the market. We report on a cost-efficient and scalable approach to improving the stability of stretchable conductor inks based on silver flakes by coating them with a thin layer of gold. The resulting conductors are highly conductive, remain functional under high strain, and show excellent corrosion and tarnishing stability, making them ideal for wearable LED and NFC circuits.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Environmental Sciences
Yupeng Yan, Xionghan Feng, Xiaoming Wang, Wei Li, Shuai Lan, Lirong Zheng, Qin Zhang, Biao Wan
Summary: Naturally occurring oxides can react with zinc oxide nanoparticles, changing their transformation and toxicity to ecological receptors. The interactions of ZnO NPs with phosphorus ligands pre-sorbed gamma-alumina were investigated, and it was found that the pre-sorption of ligands can greatly influence the solubility, stability, transformation, and fate of ZnO NPs. As the concentration of ZnO NPs increases, surface Zn (II) complexes gradually transform into zinc phytate and Zn-Al layered double hydroxide precipitates. The pre-sorption of orthophosphate also inhibits ZnO NP transformation into Zn-Al LDH precipitates on gamma-alumina.
ENVIRONMENT INTERNATIONAL
(2023)
Article
Automation & Control Systems
Hao Jia, Yuxiang Huan, Chen Ding, Yulong Yan, Jianjun Cui, Jiachen Wang, Chuhuang Cai, Lida Xu, Zhuo Zou, Lirong Zheng
Summary: Ultralow latency parsing of financial data is becoming increasingly important in high-frequency trading. This article proposes a domain-specific accelerator for the market data distribution system, which integrates a FAST decoder, a 10-Gbps network interface, and a high-speed PCIe host interface into a single FPGA acceleration card. The proposed accelerator achieves runtime reconfigurability using finite state machines and can decode 16 fields simultaneously in a pipelined manner, resulting in a decoding latency of only 33 ns. Evaluated on the Xilinx Alveo U200 acceleration card, this work improves decoding latency by 26%-72% compared to state-of-the-art FPGA designs and outperforms software baseline by > 27x in terms of latency covering both decoding and communication.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2023)
Article
Chemistry, Multidisciplinary
Jinchang Fan, Zhipeng Feng, Yajing Mu, Xin Ge, Dewen Wang, Lei Zhang, Xiao Zhao, Wei Zhang, David J. Singh, Jingyuan Ma, Lirong Zheng, Weitao Zheng, Xiaoqiang Cui
Summary: We demonstrate highly stable PdHx@Ru metallenes with a tensile strained Ru surface layer. These metallenes exhibit outstanding alkaline hydrogen evolution reaction activity and robust stability. The tensile strained Ru outer layer lowers the energy barrier of H2O dissociation and provides a moderate hydrogen adsorption energy.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Congyang Liu, Ziyi Yang, Xin Zhang, Zikai Zhu, Haoming Chu, Yuxiang Huan, Li-Rong Zheng, Zhuo Zou
Summary: In this work, a neuromorphic processor is presented for AIoT applications, featuring low-power consumption, small footprint, STDP-based online learning, and the ability to adapt to multiple applications. The use of hybrid precision, precision-configurable neuron units, unified memory architecture, and dynamic pruning technique contributes to improved energy and time efficiency in training and inference.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Chemistry, Multidisciplinary
E. Mustafa, E. A. Dawi, Z. H. Ibupoto, A. M. M. Ibrahim, A. Elsukova, X. Liu, A. Tahira, R. E. Adam, M. Willander, O. Nur
Summary: Water splitting energy production relies on high-performance PECs, and CuO is considered an excellent photocathode material. By incorporating Ag2WO4 nanoparticles onto CuO nanoleaves using SILAR, a CuO/Ag2WO4 composite with outstanding performance in the PEC water splitting process is developed. Factors such as surface active sites, charge separation rate, surface defects, and CuO and Ag2WO4 interaction contribute to the performance of the composite.
Article
Materials Science, Multidisciplinary
Lukas Graf, Martin Knupfer, Qingqing Wang, Mats Fahlman, Xianjie Liu
Summary: Two-dimensional, high-quality perylene single crystals were successfully grown using a space-confined strategy method. The films exhibited alpha form crystallization, which was confirmed through various techniques. The optical absorption measurements showed strong anisotropy and excellent agreement with literature data, while the field-effect transistor's anisotropic mobility data demonstrated high crystalline order. Momentum-dependent studies using electron energy-loss spectroscopy revealed negative dispersion of the first exciton along the crystal b direction, with an exciton bandwidth of 72 meV. The observed behavior is believed to be a result of charge-transfer exciton coupling between perylene dimers in the unit cell.
Article
Chemistry, Physical
Shenghua Ye, Shuhua Xie, Yaqi Lei, Xiuyuan Yang, Jing Hu, Lirong Zheng, Zhida Chen, Yonghuan Fu, Xiangzhong Ren, Yongliang Li, Xiaoping Ouyang, Qianling Zhang, Jianhong Liu, Xueliang Sun
Summary: In this study, dual-metal atomic pairs of Mn-Fe binuclear sites were constructed, which exhibited strong short-range electronic interaction and improved oxygen reduction reaction performance.
Article
Materials Science, Multidisciplinary
Taowen Dong, Wencai Yi, Ting Deng, Tingting Qin, Xianyu Chu, He Yang, Lirong Zheng, Seung Jo Yoo, Jin-Gyu Kim, Zizhun Wang, Yan Wang, Wei Zhang, Weitao Zheng
Summary: This study investigates the conversion reaction mechanism of α-Fe2O3 and reveals the impact of diffusional and diffusionless transformation on electrochemical performance, as well as a method to achieve pseudocapacitance through diffusionless transformation.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
