共查询到20条相似文献,搜索用时 15 毫秒
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2‐Dimensional Transition Metal Dichalcogenides with Tunable Direct Band Gaps: MoS2(1–x)Se2x Monolayers
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John Mann Quan Ma Patrick M. Odenthal Miguel Isarraraz Duy Le Edwin Preciado David Barroso Koichi Yamaguchi Gretel von Son Palacio Andrew Nguyen Tai Tran Michelle Wurch Ariana Nguyen Velveth Klee Sarah Bobek Dezheng Sun Tony. F. Heinz Talat S. Rahman Roland Kawakami Ludwig Bartels 《Advanced materials (Deerfield Beach, Fla.)》2014,26(9):1399-1404
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Semiconductors: Growth of Large‐Area 2D MoS2(1‐x)Se2x Semiconductor Alloys (Adv. Mater. 17/2014)
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Qingliang Feng Yiming Zhu Jinhua Hong Mei Zhang Wenjie Duan Nannan Mao Juanxia Wu Hua Xu Fengliang Dong Fang Lin Chuanhong Jin Chunming Wang Jin Zhang Liming Xie 《Advanced materials (Deerfield Beach, Fla.)》2014,26(17):2763-2763
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Preparation of Single‐Layer MoS2xSe2(1‐x) and MoxW1‐xS2 Nanosheets with High‐Concentration Metallic 1T Phase
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Chaoliang Tan Wei Zhao Apoorva Chaturvedi Zhen Fei Zhiyuan Zeng Junze Chen Ying Huang Peter Ercius Zhimin Luo Xiaoying Qi Bo Chen Zhuangchai Lai Bing Li Xiao Zhang Jian Yang Yun Zong Chuanhong Jin Haimei Zheng Christian Kloc Hua Zhang 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(14):1866-1874
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Pseudocapacitance of TiO2−x/CNT Anodes for High‐Performance Quasi‐Solid‐State Li‐Ion and Na‐Ion Capacitors
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Lan‐Fang Que Fu‐Da Yu Zhen‐Bo Wang Da‐Ming Gu 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(17)
It is challenging for flexible solid‐state hybrid capacitors to achieve high‐energy‐high‐power densities in both Li‐ion and Na‐ion systems, and the kinetics discrepancy between the sluggish faradaic anode and the rapid capacitive cathode is the most critical issue needs to be addressed. To improve Li‐ion/Na‐ion diffusion kinetics, flexible oxygen‐deficient TiO2?x/CNT composite film with ultrafast electron/ion transport network is constructed as self‐supported and light‐weight anode for a quasi‐solid‐state hybrid capacitor. It is found that the designed porous yolk–shell structure endows large surface area and provides short diffusion length, the oxygen‐deficient composite film can improve electrical conductivity, and enhance ion diffusion kinetic by introducing intercalation pseudocapacitance, therefore resulting in advance electrochemical properties. It exhibits high capacity, excellent rate performance, and long cycle life when utilized as self‐supported anodes for Li‐ion and Na‐ion batteries. When assembled with activated carbon/carbon nanotube (AC/CNT) flexible cathode, using ion conducting gel polymer as the electrolyte, high energy densities of 104 and 109 Wh kg?1 are achieved at 250 W kg?1 in quasi‐solid‐state Li‐ion and Na‐ion capacitors (LICs and SICs), respectively. Still, energy densities of 32 and 36 Wh kg?1 can be maintained at high power densities of 5000 W kg?1 in LICs and SICs. 相似文献
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A. V. Shlyakhtina M. V. Boguslavskii S. Yu. Stefanovich I. V. Kolbanev A. V. Knotko O. K. Karyagina S. A. Borisov L. G. Shcherbakova 《Inorganic Materials》2006,42(5):519-527
Data are presented on the evolution of the pyrochlore structure in the Ln2+x Hf2?x O7?δ (Ln = Sm, Eu; x = 0.096) solid solutions and Ln2Hf2O7 (Ln = Gd, Tb) compounds prepared from mechanically activated oxide mixtures. Sm2.096Hf1.904O6.952 is shown to undergo pyrochlore-disordered pyrochlore-pyrochlore (P-P1-P) phase transformations in the temperature range 1200–1670°C. The former transformation leads to a rise in 840°C conductivity from 10?4 to 3 × 10?3 S/cm in the samples synthesized at 1600°C, and the latter leads to a drop in 840°C conductivity to 6 × 10?4 S/cm in the samples synthesized at 1670°C. The reduction in the conductivity of Sm2.096Hf1.904O6.952 is accompanied by the disappearance of the assumed superstructure. In the range 1300–1670°C, Eu2+x Hf2?x O7?δ (x = 0.096) and Ln2Hf2O7 (Ln = Gd, Tb) have a disordered pyrochlore structure. The highest 840°C conductivity is offered by Eu2.096Hf1.904O6.952, Gd2Hf2O7, and Tb2Hf2O7 synthesized at 1670°C: 7.5 × 10?3, 5 × 10?3, and 2.5 × 10?2 S/cm, respectively. 相似文献
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Young‐Bok Kim Jung‐Sik Hong Chang‐Hoon Lie 《Quality and Reliability Engineering International》2009,25(2):215-228
In this paper, we investigate the economic‐statistical design method for the 2‐of‐2 runs rule and the 2‐of‐3 runs rule. The Markov chain approach is used to obtain the average run length and the process cycle time. In addition, a simplified algorithm is presented to search the optimal setting of the design parameters. A numerical example and sensitivity analysis are also provided to compare the performances of the runs rules. The results show that the use of runs rule scheme can reduce operating cost comparing with the Shewhart control chart while maintaining a good statistical performance. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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Tofik Ahmed Shifa Fengmei Wang Kaili Liu Zhongzhou Cheng Kai Xu Zhenxing Wang Xueying Zhan Chao Jiang Jun He 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(16)
The rational design of Earth abundant electrocatalysts for efficiently catalyzing hydrogen evolution reaction (HER) is believed to lead to the generation of carbon neutral energy carrier. Owing to their fascinating chemical and physical properties, transition metal dichalcogenides (TMDs) are widely studied for this purpose. Of particular note is that doping by foreign atom can bring the advent of electronic perturbation, which affects the intrinsic catalytic property. Hence, through doping, the catalytic activity of such materials could be boosted. A rational synthesis approach that enables phosphorous atom to be doped into WS2 without inducing phase impurity to form WS2(1? x )P2 x nanoribbon (NRs) is herein reported. It is found that the WS2(1? x )P2 x NRs exhibit considerably enhanced HER performance, requiring only ?98 mV versus reversible hydrogen electrode to achieve a current density of ?10 mA cm?2. Such a high performance can be attributed to the ease of H‐atom adsorption and desorption due to intrinsically tuned WS2, and partial formation of NRs, a morphology wherein the exposure of active edges is more pronounced. This finding can provide a fertile ground for subsequent works aiming at tuning intrinsic catalytic activity of TMDs. 相似文献
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Au Nanoclusters Sensitized Black TiO2−x Nanotubes for Enhanced Photodynamic Therapy Driven by Near‐Infrared Light
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Dan Yang Arif Gulzar Guixin Yang Shili Gai Fei He Yunlu Dai Chongna Zhong Piaoping Yang 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(48)
The low reactive oxygen species production capability and the shallow tissue penetration of excited light (UV) are still two barriers in photodynamic therapy (PDT). Here, Au cluster anchored black anatase TiO2?x nanotubes (abbreviated as Au25/B‐TiO2?x NTs) are synthesized by gaseous reduction of anatase TiO2 NTs and subsequent deposition of noble metal. The Au25/B‐TiO2?x NTs with thickness of about 2 nm exhibit excellent PDT performance. The reduction process increased the density of Ti3+ on the surface of TiO2, which effectively depresses the recombination of electron and hole. Furthermore, after modification of Au25 nanoclusters, the PDT efficiency is further enhanced owing to the changed electrical distribution in the composite, which forms a shallow potential well on the metal–TiO2 interface to further hamper the recombination of electron and hole. Especially, the reduction of anatase TiO2 can expend the light response range (UV) of TiO2 to the visible and even near infrared (NIR) light region with high tissue penetration depth. When excited by NIR light, the nanoplatform shows markedly improved therapeutic efficacy attributed to the photocatalytic synergistic effect, and promotes separation or restrained recombination of electron and hole, which is verified by experimental results in vitro and in vivo. 相似文献