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843 results on '"Liu, Zhenghui"'

53. Manipulating Surface Band Bending of III‐Nitride Nanowires with Ambipolar Charge‐Transfer Characteristics: A Pathway Toward Advanced Photoswitching Logic Gates and Encrypted Optical Communication

Author

Chen, Wei, primary, Wang, Danhao, additional, Wang, Weiyi, additional, Kang, Yang, additional, Liu, Xin, additional, Fang, Shi, additional, Li, Liuan, additional, Luo, Yuanmin, additional, Liang, Kun, additional, Liu, Yuying, additional, Luo, Dongyang, additional, Memon, Muhammad Hunain, additional, Yu, Huabin, additional, Gu, Wengang, additional, Liu, Zhenghui, additional, Hu, Wei, additional, and Sun, Haiding, additional

Published
2023
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63. Direct measurement for nanoscale vertical carrier diffusion on semiconductor surface—An approach toward scanning diffusion microscopy.

Author

Wang, Yakun, Liu, Zhenghui, Song, Wentao, Xu, Gengzhao, Chen, Kebei, Zhang, Chunyu, Han, Sha, Wang, Jianfeng, and Xu, Ke

Subjects
*SURFACE diffusion, *DIFFUSION coefficients, *MICROSCOPY, *TOPOGRAPHIC maps, *SPATIAL resolution
Abstract

Carrier diffusion properties, including the diffusion length, diffusion coefficient, and carrier lifetime are important for photonic devices. In nitride semiconductors, there are many microscopic structures, which have a strong influence on carrier diffusion. In this paper, a method based on the photo-assisted Kelvin-probe force microscope and the confocal time-resolved photoluminescence spectrum at the same position is developed to map simultaneously the topography and the nanoscale vertical carrier diffusion on the semiconductor surface. On the surface without any dislocations, the hole diffusion length and diffusion coefficient are 161 ± 8 nm and 1.6 ± 0.2 cm2/s, respectively. Near the termination of the dislocation loops on the surface, it can be clearly seen that the diffusion length and diffusion coefficient gradually drop to about 13 ± 5 nm and 0.02 ± 0.01 cm2/s with a spatial resolution of about 100 nm. [ABSTRACT FROM AUTHOR]

Published
2022
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66. The impact of COVID-19 pandemic on hand hygiene compliance of healthcare workers in a tertiary hospital in East China

Author

Zhang, Xing, primary, Ma, Yonghui, additional, Kong, Li, additional, Li, Yusen, additional, Wang, Juan, additional, Li, Ning, additional, Xia, Yujie, additional, Wang, Peng, additional, Zhang, Min, additional, Liu, Lili, additional, Zhang, Dingding, additional, Wen, Luhan, additional, Wang, Shuangshuang, additional, Liu, Zhenghui, additional, Yue, Xia, additional, Wang, Jixia, additional, Zhang, Tong, additional, and Meng, Xiujuan, additional

Published
2023
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67. An Authentication and Recovery Scheme for Digital Speech Signal Based on DWT

Author

Wang, Jing, Liu, Zhenghui, He, Junjie, Qi, Chuanda, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Shi, Yun-Qing, editor, Kim, Hyoung Joong, editor, Pérez-González, Fernando, editor, and Echizen, Isao, editor

Published
2016
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68. Efficient and Selective Dissolution of Li from Lithium-Ion Battery LiFePO4Cathode by Natural Deep Eutectic Solvents

Author

Chen, Yu, Zhang, Fuguang, Yang, Cheng, Ju, Xiaoge, Zhang, Ziyang, Liu, Zhenghui, and Yang, Mingshuai

Abstract

Due to the wide application of lithium iron phosphate (LFP)-based lithium-ion batteries (LIBs), the dissolution of LFP is a crucial step in the process of recycling LFP from LFP-based LIBs. However, the traditional methods for the dissolution of LFP typically require the usage of hazardous solvents, elevated temperatures, or limited efficiency. Achieving efficient, green, and selective dissolution of LFP at low temperatures remains a significant challenge. Here, we, for the first time, find that natural deep eutectic solvents (NADESs) containing glucose and lactic acid show a high Li leaching efficiency of 96.5% for LFP dissolution at a mild temperature, with Li more selectively separated from LFP than Fe. Both glucose and lactic acid in DESs are naturally available, cheap, biodegradable, and nontoxic. This research provides valuable guidance for the development of a green, mild, natural, and efficient process for achieving a sustainable recovery of spent LFP-based LIBs.

Published
2024
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74. Light‐Induced Adaptive Structural Evolution in Gallium Nitride Nanowire/Nickel Hydroxide Symbiotic System in Photoelectrochemical Environment.

Author

Kang, Yang, Wang, Danhao, Wang, Anyang, Chen, Wei, Liu, Boyang, Fang, Shi, Liu, Xin, Li, Liuan, Ge, Binghui, Liu, Zhenghui, Zuo, Chengjie, Fu, Lan, Guo, Yuzheng, Liang, Kang, Liu, Sheng, and Sun, Haiding

Subjects
BIOLOGICAL evolution, GALLIUM nitride, NANOWIRES, SEMICONDUCTOR nanowires, NITRIDES, BIOLOGICAL fitness, NICKEL, HYDROXIDES
Abstract

The adaptability of living organisms to dynamically adjust their biological behavior in response to fluctuating surroundings is a prerequisite for their evolutionary success. However, artificially‐synthesized materials, especially semiconductors, have not been able to replicate such adaptability due to their inherent physical rigidity and lack of intrinsic structural responsiveness to external stimuli. Herein, an adaptive structural evolution in group‐III‐nitride semiconductors is demonstrated by constructing an AlGaN‐nanowire/Ni(OH)2 symbiotic‐system, resulting in self‐improved optoelectronic characteristics. The mutualistic interplay between AlGaN and Ni(OH)2 nanostructure leads to the adaptive evolution of crystalline‐facets of AlGaN‐nanowires, along with self‐optimization of Ni(OH)2 nanocrystals upon photon‐irradiation during its operation. Specifically, the nanowire‐surfaces dynamically evolve during Ni(OH)2 photo‐deposition, removing the (0001¯$\bar{1}$) plane while exposing the (101¯1¯$\bar{1}\bar{1}$), which facilitates carrier transport at AlGaN/Ni(OH)2 interface. Moreover, light‐induced electrons generated from AlGaN‐nanowires then partially reduce Ni2+ ions in the Ni(OH)2 nanostructure into Ni0 nanometals, which further boosts the proton reduction thermodynamics, generating an unusual self‐improving photocurrent from −59.6 to −101.6 µA cm−2. Such a "symbiotic system," which is barely observed in conventional semiconductors, provides a promising avenue toward realizing smart adaptive semiconductors that are capable of dynamic structural evolution to fully unleash their potential for emerging optoelectronic and artificial‐photocatalysis applications. [ABSTRACT FROM AUTHOR]

Published
2024
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85. The effects of short-term and long-term phthalate exposures on ovarian follicle growth dynamics and hormone levels in female mice†

Author

Santacruz-Márquez, Ramsés, Safar, Adira M, Laws, Mary J, Meling, Daryl D, Liu, Zhenghui, Kumar, T Rajendra, Nowak, Romana A, Raetzman, Lori T, and Flaws, Jodi A

Abstract

Di(2-ethylhexyl) phthalate and diisononyl phthalate are widely used as plasticizers in polyvinyl chloride products. Short-term exposures to phthalates affect hormone levels, ovarian follicle populations, and ovarian gene expression. However, limited data exist regarding the effects of long-term exposure to phthalates on reproductive functions. Thus, this study tested the hypothesis that short-term and long-term exposure to di(2-ethylhexyl) phthalate or diisononyl phthalate disrupts follicle dynamics, ovarian and pituitary gene expression, and hormone levels in female mice. Adult CD-1 female mice were exposed to vehicle, di(2-ethylhexyl) phthalate, or diisononyl phthalate (0.15 ppm, 1.5 ppm, or 1500 ppm) via the chow for 1 or 6 months. Short-term exposure to di(2-ethylhexyl) phthalate (0.15 ppm) and diisononyl phthalate (1.5 ppm) decreased serum follicle-stimulating hormone levels compared to control. Long-term exposure to di(2-ethylhexyl) phthalate and diisononyl phthalate (1500 ppm) increased the percentage of primordial follicles and decreased the percentages of preantral and antral follicles compared to control. Both phthalates increased follicle-stimulating hormone levels (di(2-ethylhexyl) phthalate at 1500 ppm; diisononyl phthalate at 1.5 ppm) and decreased luteinizing hormone levels (di(2-ethylhexyl) phthalate at 0.15 and 1.5 ppm; diisononyl phthalate at 1.5 ppm and 1500 ppm) compared to control. Furthermore, both phthalates altered the expression of pituitary gonadotropin subunit genes (Cga, Fshb, and Lhb) and a transcription factor (Nr5a1) that regulates gonadotropin synthesis. These data indicate that long-term exposure to di(2-ethylhexyl) phthalate and diisononyl phthalate alters follicle growth dynamics in the ovary and the expression of gonadotropin subunit genes in the pituitary and consequently luteinizing hormone and follicle-stimulating hormone synthesis.Long-term exposure to phthalates affects ovarian follicle dynamics, peptide hormone-related genes, and peptide hormone levels.Graphical Abstract

Published
2024
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88. Facet-dependent electrocatalytic oxidation activity of Co3O4 nanocrystals for 5-hydroxymethylfurfural.

Author

Zhang, Zhenchuan, Yang, Zhaohui, Wei, Chenyang, Liu, Zhenghui, and Mu, Tiancheng

Subjects
NANOCRYSTALS, METAL catalysts, DENSITY functional theory, METALLIC oxides, NANORODS
Abstract

Metal oxide catalysts' performance depends on their crystal structure, including the surface arrangement and coordination of metal cations and oxygen anions on the exposed facets. Here, we fabricated Co3O4 nanocrystals (NCs) with predominantly exposed (110), (111), (112), and (114) facets in the shapes of nanorod (Co-R), hexagonal nanoplate (Co-H), nanolaminar (Co-L), and nanoparticle (Co-P), respectively. The Co3O4 NC with exposed (114) high-index facet exhibits the highest 5-hydroxymethylfurfural (HMF) electrocatalytic activity, while the Co3O4 NC with exposed (112) shows the lowest activity. Both density functional theory (DFT) calculations and experiments reveal that the primary factor impacting the catalytic performance of Co3O4 NCs is the difference in HMF adsorption energy on various crystal facets. By doping Cr into Co3O4 (114), we tuned the adsorption energy of HMF to an optimal level, thereby achieving the best catalytic performance. Based on this, the adsorption behavior of other aldehyde–alcohol organic small molecules was also evaluated, and the linear relationship between adsorption strength and catalytic activity was confirmed. This work demonstrates that adjusting the exposed crystal facets of Co3O4 can alter the adsorption and catalytic capabilities of aldehyde–alcohol organic small molecules. It also provides explicit knowledge that could improve our understanding of facet-dependent reactions for other metal oxide catalysts. [ABSTRACT FROM AUTHOR]

Published
2023
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89. Achieving Record-High Photoelectrochemical Photoresponse Characteristics by Employing Co3O4 Nanoclusters as Hole Charging Layer for Underwater Optical Communication

Author

Kang, Yang, primary, Wang, Danhao, additional, Gao, Yunzhi, additional, Guo, Siqi, additional, Hu, Kejun, additional, Liu, Boyang, additional, Fang, Shi, additional, Memon, Muhammad Hunain, additional, Liu, Xin, additional, Luo, Yuanmin, additional, Sun, Xiyu, additional, Luo, Dongyang, additional, Chen, Wei, additional, Li, Liuan, additional, Jia, Hongfeng, additional, Hu, Wei, additional, Liu, Zhenghui, additional, Ge, Binghui, additional, and Sun, Haiding, additional

Published
2023
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92. Uniconazole enhances lodging resistance by increasing structural carbohydrate and sclerenchyma cell wall thickness of japonica rice (Oryza sativa L.) under shading stress

Author

Zhu, Meichen, primary, Lin, Chunhao, additional, Jiang, Zhengrong, additional, Yan, Feiyu, additional, Li, Ziyu, additional, Tang, Xinao, additional, Yang, Fei, additional, Ding, Yanfeng, additional, Li, Weiwei, additional, Liu, Zhenghui, additional, and Li, Ganghua, additional

Published
2023
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