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Two-Dimensional Electron Gas in MoSi_(2)N_(4)/VSi_(2)N_(4)Heterojunction by First Principles Calculation

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Chinese Physics Letters 2022年第12期39卷 57-64页

作者： Ruiling Gao Chao Liu Le Fang Bixia Yao Wei Wu qiling xiao Shunbo Hu Yu Liu Heng Gao Shixun Cao Guangsheng Song Xiangjian Meng xiaoshuang Chen Wei Ren Physics Department State Key Laboratory of Advanced Special SteelMaterials Genome InstituteShanghai Key Laboratory of High Temperature SuperconductorsInternational Center of Quantum and Molecular StructuresShanghai UniversityShanghai 200444China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) Anhui University of TechnologyMaanshan 243002China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

Van der Waals(vdW)layered two-dimensional(2D)materials,which may have high carrier mobility,valley polarization,excellent mechanical properties and air stability,have been widely investigated *** explore the possibility of producing a spin-polarized two-dimensional electron gas(2DEG)in the heterojunction composed of insulators MoSi_(2)N_(4)and VSi_(2)N_(4)by using first-principles *** to the charge transfer effect,the 2DEG at the interface of the MoSi_(2)N_(4)/VSi_(2)N_(4)heterojunction is ***,for different kinds of stacking of heterojunctions,lattice strain and electric fields can effectively tune the electronic structures and lead to metal-to-semiconductor *** compressive strain or electric field parallel to c axis,the 2DEG disappears and band gap opening *** the contrary,interlayer electron transfer enforces the system to become metallic under the condition of tensile strain or electric field anti-parallel to c *** changes are mainly attributed to electronic redistribution and orbitals’*** addition,we reveal that MoSi_(2)N_(4)/VSi_(2)N_(4)lateral heterojunctions of armchair and zigzag edges exhibit different electronic properties,such as a large band gap semiconductor and a metallic *** findings provide insights into electronic band engineering of MoSi_(2)N_(4)/VSi_(2)N_(4)heterojunctions and pave the way for future spintronics applications.

关键词： heterojunction polarization metallic

Nb含量对Ti-Nb合金薄膜微观形貌与力学性能的影响

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中国科学：技术科学 2020年第6期50卷 801-810页

作者：郭孝云肖祁陵马昕迪王刚上海大学材料基因组工程研究院上海200444 上海大学材料科学与工程学院上海200444

Ti-Nb合金薄膜因其形状记忆效应和良好的生物相容性引起广泛关注.本文通过调节Ti-Nb合金薄膜中的Nb含量,实现了对薄膜表面和横截面微观形貌、晶体结构、力学性能的调控.研究发现,随着Nb含量的增加,薄膜表面微观形貌从圆整颗粒状过渡到... 详细信息

Ti-Nb合金薄膜因其形状记忆效应和良好的生物相容性引起广泛关注.本文通过调节Ti-Nb合金薄膜中的Nb含量,实现了对薄膜表面和横截面微观形貌、晶体结构、力学性能的调控.研究发现,随着Nb含量的增加,薄膜表面微观形貌从圆整颗粒状过渡到互相交织的针叶状;晶粒从贯穿横截面的柱状晶过渡到介于等轴晶和柱状晶之间的状态;薄膜晶体结构呈现出(211)β晶面逐步取代(103)α晶面并最终由β单相组成的演变过程.Ti-16Nb(原子百分比,下文同)和Ti-20Nb薄膜纳米压痕实验的加载曲线上出现pop-in现象,证实其存在超弹性,对应的马氏体相变临界载荷分别为1761和2247μ***-20Nb薄膜由于相互交织的针叶状组织,其硬度值达到7.43±0.12 GPa,屈服强度提高至2.64±0.07 GPa.同时,β单相的晶体结构使得Ti-20Nb薄膜弹性能量回复率大幅提升至53.49%±0.94%,从而提高薄膜抵抗塑性变形的能力,可保证MEMS器件在使用过程中的控制精度,并延长其使用寿命.

关键词： Ti-Nb薄膜微观形貌晶体结构力学性能超弹性

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ZnO薄膜结构表征的研究现状

材料导报 2005年第F11期19卷 300-303页

作者：肖祁陵徐鹏张萌南昌大学材料科学与工程学院南昌330047 南昌大学测试中心南昌330047

ZnO薄膜是继CaN材料之后的另一种具有应用前景的直接宽带隙半导体材料。针对目前对ZnO薄膜结构的分析，综述了ZnO薄膜结构表征的常用方法，着重分析了XRD在ZnO薄膜结构方面的应用。

关键词： ZnO薄膜结构分析 XRD 直接宽带隙半导体材料

氧分压和沉积速率对YSZ薄膜残余应力的影响

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中国激光 2009年第5期36卷 1195-1199页

作者：肖祁陵邵淑英邵建达范正修中国科学院上海光学精密机械研究所上海201800 中国科学院研究生院北京100039

采用摩尔分数为7%的Y2O3掺杂的ZrO2混合烧结料为原料,在不同的氧分压和沉积速率下用电子束蒸发方法沉积氧化钇稳定氧化锆(YSZ)薄膜样品。利用ZYGO MarkⅢ-GPI数字波面干涉仪对YSZ薄膜的残余应力进行了研究,讨论了氧分压和沉积速牢等工... 详细信息

采用摩尔分数为7%的Y2O3掺杂的ZrO2混合烧结料为原料,在不同的氧分压和沉积速率下用电子束蒸发方法沉积氧化钇稳定氧化锆(YSZ)薄膜样品。利用ZYGO MarkⅢ-GPI数字波面干涉仪对YSZ薄膜的残余应力进行了研究,讨论了氧分压和沉积速牢等工艺参节对残余应力的影响。实验结果表明,不同氧分压和沉积速率下,YSZ薄膜的残余应力均为张应力;应力值随氧分压的升高先增大后减小,随沉积速率的增加单调增加。热应力对薄膜所呈现的张应力性质起着决定性作用,同时应力值的大小受本征应力和附加应力的影响。通过对样品的X射线衍射(XRI))测试,结合薄膜做结构的变化,对应力的形成原因进行了解释。

关键词：薄膜残余应力 YSZ薄膜氧分压沉积速率

沉积温度对氧化钇稳定氧化锆薄膜残余应力的影响

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光学学报 2008年第5期28卷 1007-1011页

作者：肖祁陵贺洪波邵淑英邵建达范正修中国科学院上海光学精密机械研究所

采用自制掺摩尔分数12%的Y2O3的ZrO2混合颗粒料为原料,在不同的沉积温度下用电子束蒸发方法沉积氧化钇稳定氧化锆(YSZ)薄膜样品。利用ZYGOMarkⅢ-GPI数字波面干涉仪对氧化钇稳定氧化锆薄膜的残余应力进行了研究,讨论了沉积温度对残余应... 详细信息

采用自制掺摩尔分数12%的Y2O3的ZrO2混合颗粒料为原料,在不同的沉积温度下用电子束蒸发方法沉积氧化钇稳定氧化锆(YSZ)薄膜样品。利用ZYGOMarkⅢ-GPI数字波面干涉仪对氧化钇稳定氧化锆薄膜的残余应力进行了研究,讨论了沉积温度对残余应力的影响。实验结果表明:随沉积温度升高,氧化钇稳定氧化锆薄膜中残余应力状态由张应力变为压应力,且压应力值随着沉积温度升高而增大;用X射线衍射仪表征了不同沉积温度下氧化钇稳定氧化锆薄膜的微观结构,探讨了薄膜微观结构与其应力的对应关系,并对比了纯ZrO2薄膜表现出的应力状态。

关键词：薄膜光学残余应力氧化钇稳定氧化锆薄膜沉积温度

不同方法制备的Ta2O5薄膜光学性能和激光损伤阈值的对比分析

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中国激光 2008年第10期35卷 1595-1599页

作者：许程董洪成肖祁陵麻健勇晋云霞邵建达中国科学院上海光学精密机械研究所上海201800 中国科学院研究生院北京100039

采用电子束蒸发(EBE)和离子束溅射(IBS)制备了不同的Ta_2O_5薄膜,同时对电子束蒸发制备的薄膜进行了退火处理。研究了制备的Ta_2O_5薄膜的光学性能、激光损伤阈值(LIDT)、吸收、散射、粗糙度、微缺陷密度和杂质含量。结果表明,退火可使... 详细信息

采用电子束蒸发(EBE)和离子束溅射(IBS)制备了不同的Ta_2O_5薄膜,同时对电子束蒸发制备的薄膜进行了退火处理。研究了制备的Ta_2O_5薄膜的光学性能、激光损伤阈值(LIDT)、吸收、散射、粗糙度、微缺陷密度和杂质含量。结果表明,退火可使电子束蒸发制备的薄膜的光学性能得到改善,接近离子束溅射的薄膜的光学性能。电子束蒸发制备的薄膜的损伤阈值较低的主要原因在于吸收大,微缺陷密度和杂质含量高,而与薄膜的散射和粗糙度关系不大。退火后薄膜的吸收和微缺陷密度都明显降低,损伤阈值得到提高。退火后的薄膜损伤阈值仍然低于溅射得到的薄膜损伤阈值是因为退火并不能降低膜内的杂质含量,因此选用高纯度的蒸发膜料和减少电子束蒸发过程中的污染有可能进一步提高薄膜的损伤阈值。

关键词：薄膜激光损伤阈值吸收退火

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Acta Geologica Sinica(English Edition) 2006年第5期80卷 724-732页

作者： LU Hongbo ZHANG Yuxu ZHANG qiling xiao Jiafei Department of Earth Sciences China University of Petroleum Dongying Shandong 257062 Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou 550002

The authors introduced two kinds of newly found soft-sediment deformation-synsedimentary extension structure and syn-sedimentary compression structure, and discuss their origins and constraints on basin tectonic evolution. One representative of the syn-sedimentary extension structure is syn-sedimentary boudinage structure, while the typical example of the syn-sedimentary compression structure is compression sand pillows or compression wrinkles. The former shows NW-SE-trendlng contemporaneous extension events related to earthquakes in the rift basin near a famous Fe-Nb-REE deposit in northern China during the Early Paleozoic （or Mesoproterozoic as proposed by some researches）, while the latter indicates NE-SW-trending contemporaneous compression activities related to earthquakes in the Middle Triassic in the Nanpanjiang remnant basin covering south Guizhou, northwestern Guangxi and eastern Yunnan in southwestern China. The syn-sedimentary boudinage structure was found in an earthquake slump block in the lower part of the Early Paleozoic Sailinhudong Group, 20 km to the southeast of Bayan Obo, Inner Mongolia, north of China. The slump block is composed of two kinds of very thin layers-pale-gray micrite （microcrystalline limestone） of 1-2 cm thick interbedded with gray muddy micrite layers with the similar thickness. Almost every thin muddy micrite layer was cut into imbricate blocks or boudins by abundant tiny contemporaneous faults, while the interbedded micrite remain in continuity. Boudins form as a response to layer-parallel extension （and/or layer-perpendicular flattening） of stiff layers enveloped top and bottom by mechanically soft layers. In this case, the imbricate blocks cut by the tiny contemporaneous faults are the result of abrupt horizontal extension of the crust in the SE-NW direction accompanied with earthquakes. Thus, the rock block is, in fact, a kind of seismites. The syn-sedimentary boudins indicate that there was at least a strong earthquake belt

关键词： earthquake tectonic deformation of soft-sediments syn-sedimentary extension structure,syn-compression structure tectonic evolution of basins

Enhanced ferro-/piezoelectric properties of tape-casting-derived Er^(3+)-doped Ba_(0.85)Ca_(0.15)Ti_(0.9)Zr_(0.1O3) optoelectronic thick films

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Journal of Advanced Ceramics 2020年第6期9卷 693-702页

作者： Jie XU qiling LU Jinfeng LIN Cong LIN Xinghua ZHENG Tengfei LIN xiao WU Key Laboratory of Eco-materials Advanced Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China

Er^(3+)-doped Ba_(0.85)Ca_(0.15)Ti_(0.9)Zr_(0.1O3)(xEr-BCTZ,x=0,0.005,0.01,0.015)multifunctional thick films were prepared by the tape-casting method,using sol-gel-derived nano-sized powders as the matrix *** surface morphologies,photoluminescence,and electrical properties were *** microstructures with pure perovskite structure were obtained in the thick *** doping an appropriate amount of Er^(3+),the samples exhibit superior up-conversion photoluminescence performance and simultaneously enhanced electrical *** addition,relatively higher texture fractions(with the largest value of 83.5%)were realized through introducing plate-like BaTiO_(3) templates to make the thick film grow by the[001]_(c) *** the ferro-/piezoelectric properties of the thick films were further improved,showing potential in the applications of micro-optoelectronic devices.

关键词： thick films texture ferroelectric piezoelectric photoluminescence

Integration of semi-in vivo assays and multi-omics data reveals the effect of galloylated catechins on self-pollen tube inhibition in Camellia oleifera

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Horticulture Research 2023年第1期10卷 260-273页

作者： Yihong Chang Wenfang Gong Jinming Xu Han Gong qiling Song Shixin xiao Deyi Yuan Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees of the Ministry of Education and Key Laboratory of Non-Wood Forest Products of the Forestry Ministry Central South University of Forestry and TechnologyChangshaHunan 410004China

Camellia oil extracted from the seeds of Camellia oleifera *** a popular and high-quality edible oil,but its yield is limited by seed setting,which is mainly caused by self-incompatibility(SI).One of the obvious biological features of SI plants is the inhibition of self-pollen tubes;however,the underlying mechanism of this inhibition in *** is poorly *** this study,we constructed a semi-in vivo pollen tube growth test(SIV-PGT)system that can screen for substances that inhibit self-pollen tubes without interference from the genetic *** with multi-omics analysis,the results revealed the important role of galloylated catechins in self-pollen tube inhibition,and a possible molecular regulatory network mediated by UDP-glycosyltransferase(UGT)and serine carboxypeptidase-like(SCPL)was *** summary,galloylation of catechins and high levels of galloylated catechins are specifically involved in pollen tube inhibition under self-pollination rather than cross-pollination,which provides a new understanding of SI in *** results will contribute to sexual reproduction research on *** and provide theoretical support for improving Camellia oil yield in production.

关键词： vivo oleifera Integration