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Xiangfeng Duan

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https://www.readbyqxmd.com/read/30549121/a-highly-active-star-decahedron-cu-nanocatalyst-for-hydrocarbon-production-at-low-overpotentials
#1
Chungseok Choi, Tao Cheng, Michelle Flores Espinosa, Huilong Fei, Xiangfeng Duan, William A Goddard, Yu Huang
The electrochemical carbon dioxide reduction reaction (CO2 RR) presents a viable approach to recycle CO2 gas into low carbon fuels. Thus, the development of highly active catalysts at low overpotential is desired for this reaction. Herein, a high-yield synthesis of unique star decahedron Cu nanoparticles (SD-Cu NPs) electrocatalysts, displaying twin boundaries (TBs) and multiple stacking faults, which lead to low overpotentials for methane (CH4 ) and high efficiency for ethylene (C2 H4 ) production, is reported...
December 14, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30523105/building-two-dimensional-materials-one-row-at-a-time-avoiding-the-nucleation-barrier
#2
Jiajun Chen, Enbo Zhu, Juan Liu, Shuai Zhang, Zhaoyang Lin, Xiangfeng Duan, Hendrik Heinz, Yu Huang, James J De Yoreo
Assembly of two-dimensional (2D) molecular arrays on surfaces produces a wide range of architectural motifs exhibiting unique properties, but little attention has been given to the mechanism by which they nucleate. Using peptides selected for their binding affinity to molybdenum disulfide, we investigated nucleation of 2D arrays by molecularly resolved in situ atomic force microscopy and compared our results to molecular dynamics simulations. The arrays assembled one row at a time, and the nuclei were ordered from the earliest stages and formed without a free energy barrier or a critical size...
December 7, 2018: Science
https://www.readbyqxmd.com/read/30511871/high-performance-black-phosphorus-field-effect-transistors-with-long-term-air-stability
#3
Daowei He, Yiliu Wang, Yu Huang, Yi Shi, Xinran Wang, Xiangfeng Duan
Two-dimensional layered materials (2DLMs) are of considerable interest for high-performance electronic devices for their unique electronic properties and atomically thin geometry. However, the atomically thin geometry makes their electronic properties highly susceptible to the environment changes. In particular, some 2DLMs (e.g., black phosphorus (BP) and SnSe2) are unstable and could rapidly degrade over time when exposed to ambient conditions. Therefore, the development of proper passivation schemes that can preserve the intrinsic properties and enhance their lifetime represents a key challenge for these atomically thin electronic materials...
December 4, 2018: Nano Letters
https://www.readbyqxmd.com/read/30483273/inflammatory-links-between-high-fat-diets-and-diseases
#4
REVIEW
Yehui Duan, Liming Zeng, Changbing Zheng, Bo Song, Fengna Li, Xiangfeng Kong, Kang Xu
In recent years, chronic overnutrition, such as consumption of a high-fat diet (HFD), has been increasingly viewed as a significant modifiable risk factor for diseases such as diabetes and certain types of cancer. However, the mechanisms by which HFDs exert adverse effects on human health remains poorly understood. Here, this paper will review the recent scientific literature about HFD-induced inflammation and subsequent development of diseases and cancer, with an emphasis on mechanisms involved. Given the expanding global epidemic of excessive HFD intake, understanding the impacts of a HFD on these medical conditions, gaining great insights into possible underlying mechanisms, and developing effective therapeutic strategies are of great importance...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/30475606/long-range-hierarchical-nanocrystal-assembly-driven-by-molecular-structural-transformation
#5
Enbo Zhu, Shiyi Wang, Xucheng Yan, Masoud Sobani, Lingyan Ruan, Chen Wang, Yuan Liu, Xiangfeng Duan, Hendrik Heinz, Yu Huang
The hierarchical control in biogenic minerals, from precise nanomorphology control to subsequent macroscopic assembly, remains a formidable challenge in artificial synthesis. Studies in biomineralization, however, are largely limited to atomic/molecular scale crystallization, devoting little attention to biomolecular higher order structures (HOSs) which impact critically on long-range assembly of biominerals. Here we demonstrate a biomimetic route that explores peptide HOSs on guiding nanocrystal formation and anisotropic assembly into hierarchical structures...
November 26, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30346160/synthetic-control-of-two-dimensional-nite-2-single-crystals-with-highly-uniform-thickness-distributions
#6
Bei Zhao, Weiqi Dang, Yuan Liu, Bo Li, Jia Li, Jun Luo, Zhengwei Zhang, Ruixia Wu, Huifang Ma, Guangzhuang Sun, Yu Huang, Xidong Duan, Xiangfeng Duan
Two-dimensional (2D) layered materials have stimulated extensive research interest for their unique thickness-dependent electronic and optical properties. However, the layer-number-dependent studies on 2D materials to date are largely limited to exfoliated flakes with relatively small lateral size and poor yield. The direct synthesis of 2D materials with a precise control of the number of atomic layers remains a substantial synthetic challenge. Here we report a systematic study of chemical vapor deposition synthesis of large-area atomically thin 2D nickel telluride (NiTe2 ) single crystals and investigate the thickness dependent electronic properties...
October 31, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30333991/quantum-interference-mediated-vertical-molecular-tunneling-transistors
#7
Chuancheng Jia, Marjan Famili, Marco Carlotti, Yuan Liu, Peiqi Wang, Iain M Grace, Ziying Feng, Yiliu Wang, Zipeng Zhao, Mengning Ding, Xiang Xu, Chen Wang, Sung-Joon Lee, Yu Huang, Ryan C Chiechi, Colin J Lambert, Xiangfeng Duan
Molecular transistors operating in the quantum tunneling regime represent potential electronic building blocks for future integrated circuits. However, due to their complex fabrication processes and poor stability, traditional molecular transistors can only operate stably at cryogenic temperatures. Here, through a combined experimental and theoretical investigation, we demonstrate a new design of vertical molecular tunneling transistors, with stable switching operations up to room temperature, formed from cross-plane graphene/self-assembled monolayer (SAM)/gold heterostructures...
October 2018: Science Advances
https://www.readbyqxmd.com/read/30298626/dietary-nutrient-levels-alter-the-metabolism-of-arginine-family-amino-acids-in-the-conceptus-of-huanjiang-mini-pigs
#8
Yehui Duan, Yue Zhao, Qian Zhu, Qiaoli Cai, Huawei Li, Yulong Yin, Zhanbin Wang, Xiangfeng Kong
BACKGROUND: The arginine family amino acids (AFAAs) exert important roles in the metabolism, growth, and development of the conceptus. However, to date, few studies have investigated the effects of maternal nutrient levels on the concentrations and metabolism of AFAAs in the conceptus. RESULTS: Compared with low nutrient (LN) diets, high nutrient (HN) diets increased (P < 0.05) the concentrations of citrulline and proline (Pro) in plasma, the concentrations of arginine, glutamine, Pro, and ornithine (Orn) in the amniotic fluid; and the concentrations of all detected AFAAs in the allantoic fluid, which were most pronounced on day 45 of pregnancy...
October 9, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/30283139/solution-processable-2d-semiconductors-for-high-performance-large-area-electronics
#9
Zhaoyang Lin, Yuan Liu, Udayabagya Halim, Mengning Ding, Yuanyue Liu, Yiliu Wang, Chuancheng Jia, Peng Chen, Xidong Duan, Chen Wang, Frank Song, Mufan Li, Chengzhang Wan, Yu Huang, Xiangfeng Duan
Two-dimensional (2D) materials, consisting of atomically thin crystal layers bound by the van der Waals force, have attracted much interest because of their potential in diverse technologies, including electronics, optoelectronics and catalysis1-10 . In particular, solution-processable 2D semiconductor (such as MoS2 ) nanosheets are attractive building blocks for large-area thin-film electronics. In contrast to conventional zero- and one-dimensional nanostructures (quantum dots and nanowires, respectively), which are typically plagued by surface dangling bonds and associated trapping states, 2D nanosheets have dangling-bond-free surfaces...
October 2018: Nature
https://www.readbyqxmd.com/read/30137075/%C3%AE-hydroxy-%C3%AE-methylbutyrate-modulates-lipid-metabolism-in-adipose-tissues-of-growing-pigs
#10
Yehui Duan, Lingyu Zhang, Fengna Li, Qiuping Guo, Cimin Long, Yulong Yin, Xiangfeng Kong, Mijun Peng, Wence Wang
BACKGROUND: The effects and roles of the leucine (Leu) metabolite β-hydroxy-β-methylbutyrate (HMB) in lipid metabolism in adipose tissues of pigs are still unknown. OBJECTIVES: This study was conducted to investigate the effects of excess Leu versus HMB on growth, carcass traits, and lipid metabolism in adipose tissues of growing pigs. METHODS AND RESULTS: Compared to control, the Leu/HMB group significantly increased/reduced weight of total fat mass, respectively, with a concurrent increase of serum adiponectin concentration (P < 0...
September 19, 2018: Food & Function
https://www.readbyqxmd.com/read/30079920/two-dimensional-transistors-beyond-graphene-and-tmdcs
#11
REVIEW
Yuan Liu, Xidong Duan, Yu Huang, Xiangfeng Duan
Two-dimensional semiconductors (2DSCs) have attracted considerable attention as atomically thin channel materials for field-effect transistors. Each layer in 2DSCs consists of a single- or few-atom-thick, covalently bonded lattice, in which all carriers are confined in their atomically thin channel with superior gate controllability and greatly suppressed OFF-state current, in contrast to typical bulk semiconductors plagued by short channel effects and heat generation from static power. Additionally, 2DSCs are free of surface dangling bonds that plague traditional semiconductors, and hence exhibit excellent electronic properties at the limit of single atom thickness...
August 13, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/30063088/synthesis-of-ultrathin-metallic-mte-2-m-v-nb-ta-single-crystalline-nanoplates
#12
Jia Li, Bei Zhao, Peng Chen, Ruixia Wu, Bo Li, Qinglin Xia, Guanghua Guo, Jun Luo, Ketao Zang, Zhengwei Zhang, Huifang Ma, Guangzhuang Sun, Xidong Duan, Xiangfeng Duan
Two-dimensional materials with intrinsic magnetism have recently drawn intense interest for both the fundamental studies and potential technological applications. However, the studies to date have been largely limited to mechanically exfoliated materials. Herein, an atmospheric pressure chemical vapor deposition route to ultrathin group VB metal telluride MTe2 (M = V, Nb, Ta) nanoplates with thickness as thin as 3 nm is reported. It is shown that the resulting nanoplates can be systematically evolved from mostly thicker hexagonal domains to thinner triangular domains with an increasing flow rate of the carrier gas...
July 31, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30016001/microwave-assisted-rapid-synthesis-of-graphene-supported-single-atomic-metals
#13
Huilong Fei, Juncai Dong, Chengzhang Wan, Zipeng Zhao, Xiang Xu, Zhaoyang Lin, Yiliu Wang, Haotian Liu, Ketao Zang, Jun Luo, Shenglong Zhao, Wei Hu, Wensheng Yan, Imran Shakir, Yu Huang, Xiangfeng Duan
Graphene-supported single atomic metals (G-SAMs) have recently attracted considerable research interest for their intriguing catalytic, electronic, and magnetic properties. The development of effective synthetic methodologies toward G-SAMs with monodispersed metal atoms is vital for exploring their fundamental properties and potential applications. A convenient, rapid, and general strategy to synthesize a series of monodispersed atomic transition metals (for example, Co, Ni, Cu) embedded in nitrogen-doped graphene by two-second microwave (MW) heating the mixture of amine-functionalized graphene oxide and metal salts is reported here...
August 2018: Advanced Materials
https://www.readbyqxmd.com/read/30009416/%C3%AE-hydroxy-%C3%AE-methyl-butyrate-promotes-leucine-metabolism-and-improves-muscle-fibre-composition-in-growing-pigs
#14
Yehui H Duan, Liming M Zeng, Fengnan N Li, Xiangfeng F Kong, Kang Xu, Qiuping P Guo, Wenlong L Wang, Lingyu Y Zhang
The aim of this study was to investigate the effects of excess leucine (Leu) vs. its metabolites α-ketoisocaproate (KIC) and β-hydroxy-β-methyl butyrate (HMB) on Leu metabolism, muscle fibre composition and muscle growth in growing pigs. Thirty-two pigs with a similar initial weight (9.55 ± 0.19 kg) were fed 1 of 4 diets for 45 days: basal diet, basal diet + 1.25% L-Leu, basal diet + 1.25% KIC-Ca, basal diet + 0.62% HMB-Ca. Results indicated that relative to the basal diet and HMB groups, Leu and KIC groups exhibited increased Leu concentrations and decreased concentrations of isoleucine, valine and EAAs in selected muscle (p < 0...
October 2018: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/29892031/gate-tunable-frequency-combs-in-graphene-nitride-microresonators
#15
Baicheng Yao, Shu-Wei Huang, Yuan Liu, Abhinav Kumar Vinod, Chanyeol Choi, Michael Hoff, Yongnan Li, Mingbin Yu, Ziying Feng, Dim-Lee Kwong, Yu Huang, Yunjiang Rao, Xiangfeng Duan, Chee Wei Wong
Optical frequency combs, which emit pulses of light at discrete, equally spaced frequencies, are cornerstones of modern-day frequency metrology, precision spectroscopy, astronomical observations, ultrafast optics and quantum information1-7 . Chip-scale frequency combs, based on the Kerr and Raman nonlinearities in monolithic microresonators with ultrahigh quality factors8-10 , have recently led to progress in optical clockwork and observations of temporal cavity solitons11-14 . But the chromatic dispersion within a laser cavity, which determines the comb formation15,16 , is usually difficult to tune with an electric field, whether in microcavities or fibre cavities...
June 2018: Nature
https://www.readbyqxmd.com/read/29806005/on-chip-in-situ-monitoring-of-competitive-interfacial-anionic-chemisorption-as-a-descriptor-for-oxygen-reduction-kinetics
#16
Mengning Ding, Guangyan Zhong, Zipeng Zhao, Zhihong Huang, Mufan Li, Hui-Ying Shiu, Yuan Liu, Imran Shakir, Yu Huang, Xiangfeng Duan
The development of future sustainable energy technologies relies critically on our understanding of electrocatalytic reactions occurring at the electrode-electrolyte interfaces, and the identification of key reaction promoters and inhibitors. Here we present a systematic in situ nanoelectronic measurement of anionic surface adsorptions (sulfates, halides, and cyanides) on ultrathin platinum nanowires during active electrochemical processes, probing their competitive adsorption behavior with oxygenated species and correlating them to the electrokinetics of the oxygen reduction reaction (ORR)...
May 23, 2018: ACS Central Science
https://www.readbyqxmd.com/read/29786447/thickness-tunable-synthesis-of-ultrathin-type-ii-dirac-semimetal-ptte-2-single-crystals-and-their-thickness-dependent-electronic-properties
#17
Huifang Ma, Peng Chen, Bo Li, Jia Li, Ruoqi Ai, Zhengwei Zhang, Guangzhuang Sun, Kangkang Yao, Zhaoyang Lin, Bei Zhao, Ruixia Wu, Xuwan Tang, Xidong Duan, Xiangfeng Duan
The recent discovery of topological semimetals has stimulated extensive research interest due to their unique electronic properties and novel transport properties related to a chiral anomaly. However, the studies to date are largely limited to bulk crystals and exfoliated flakes. Here, we report the controllable synthesis of ultrathin two-dimensional (2D) platinum telluride (PtTe2 ) nanosheets with tunable thickness and investigate the thickness-dependent electronic properties. We show that PtTe2 nanosheets can be readily grown, using a chemical vapor deposition approach, with a hexagonal or triangular geometry and a lateral dimension of up to 80 μm, and the thickness of the nanosheets can be systematically tailored from over 20 to 1...
June 13, 2018: Nano Letters
https://www.readbyqxmd.com/read/29769729/approaching-the-schottky-mott-limit-in-van-der-waals-metal-semiconductor-junctions
#18
Yuan Liu, Jian Guo, Enbo Zhu, Lei Liao, Sung-Joon Lee, Mengning Ding, Imran Shakir, Vincent Gambin, Yu Huang, Xiangfeng Duan
The junctions formed at the contact between metallic electrodes and semiconductor materials are crucial components of electronic and optoelectronic devices 1 . Metal-semiconductor junctions are characterized by an energy barrier known as the Schottky barrier, whose height can, in the ideal case, be predicted by the Schottky-Mott rule2-4 on the basis of the relative alignment of energy levels. Such ideal physics has rarely been experimentally realized, however, because of the inevitable chemical disorder and Fermi-level pinning at typical metal-semiconductor interfaces2,5-12 ...
May 2018: Nature
https://www.readbyqxmd.com/read/29690767/distinguishing-diketopyrrolopyrrole-isomers-in-single-molecule-junctions-via-reversible-stimuli-responsive-quantum-interference
#19
Yu-Peng Zhang, Li-Chuan Chen, Ze-Qi Zhang, Jing-Jing Cao, Chun Tang, Junyang Liu, Lin-Lin Duan, Yong Huo, Xiangfeng Shao, Wenjing Hong, Hao-Li Zhang
Distinguishing structural isomers at the single-molecule level remains a challenge. We report the single-molecule recognition of two diketopyrrolopyrrole containing isomers (SDPP and SPPO) employing the mechanically controllable break junction technique. The single-molecule conductances of the two isomers are indistinguishable under normal conditions. However, reversible protonation and deprotonation of the SPPO in molecular junction result in more than 1 order of magnitude conductance change, which dramatically enhances the conductance difference between the two isomers...
May 30, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29688700/strain-tuning-atomic-substitution-in-two-dimensional-atomic-crystals
#20
Honglai Li, Hongjun Liu, Linwei Zhou, Xueping Wu, Yuhao Pan, Wei Ji, Biyuan Zheng, Qinglin Zhang, Xiujuan Zhuang, Xiaoli Zhu, Xiao Wang, Xiangfeng Duan, Anlian Pan
Atomic substitution offers an important route to achieve compositionally engineered two-dimensional nanostructures and their heterostructures. Despite the recent research progress, the fundamental understanding of the reaction mechanism has still remained unclear. Here, we reveal the atomic substitution mechanism of two-dimensional atomic layered materials. We found that the atomic substitution process depends on the varying lattice constant (strain) in monolayer crystals, dominated by two strain-tuning (self-promoted and self-limited) mechanisms using density functional theory calculations...
May 22, 2018: ACS Nano
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