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Electrically-driven ultrafast out-of-equilibrium light emission from hot electrons in suspended graphene/hBN heterostructures

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International Journal of Extreme Manufacturing 2024年第1期6卷 328-338页

作者： Qiang liu Wei Xu xiaoxi li Tongyao Zhang Chengbing Qin Fang Luo Zhihong Zhu Shiqiao Qin Mengjian Zhu Kostya S Novoselov College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano-optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaHunan 410073People’s Republic of China Nanhu Laser Laboratory National University of Defense TechnologyChangshaHunan 410073People’s Republic of China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006People’s Republic of China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China Institute for Functional Intelligent Materials National University of SingaporeSingapore 117544Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

Nanoscale light sources with high speed of electrical modulation and low energy consumption are key components for nanophotonics and optoelectronics.The record-high carrier mobility and ultrafast carrier dynamics of graphene make it promising as an atomically thin light emitter which can be further integrated into arbitrary platforms by van der Waals forces.However,due to the zero bandgap,graphene is difficult to emit light through the interband recombination of carriers like conventional semiconductors.Here,we demonstrate ultrafast thermal light emitters based on suspended graphene/hexagonal boron nitride(Gr/hBN)heterostructures.Electrons in biased graphene are significantly heated up to 2800 K at modest electric fields,emitting bright photons from the near-infrared to the visible spectral range.By eliminating the heat dissipation channel of the substrate,the radiation efficiency of the suspended Gr/hBN device is about two orders of magnitude greater than that of graphene devices supported on SiO2or hBN.Wefurther demonstrate that hot electrons and low-energy acoustic phonons in graphene are weakly coupled to each other and are not in full thermal equilibrium.Direct cooling ofhigh-temperature hot electrons to low-temperature acoustic phonons is enabled by the significant near-field heat transfer at the highly localized Gr/hBN interface,resulting in ultrafast thermal emission with up to 1 GHz bandwidth under electrical excitation.It is found thatsuspending the Gr/hBN heterostructures on the SiO2trenches significantly modifies the light emission due to the formation of the optical cavity and showed a~440%enhancement inintensity at the peak wavelength of 940 nm compared to the black-body thermal radiation.The demonstration of electrically driven ultrafast light emission from suspended Gr/hBNheterostructures sheds the light on applications of graphene heterostructures in photonicintegrated circuits,such as broadband light sources and ultrafast thermo-optic phase modulators.

关键词： suspended graphene ultrafast light emitter van der Waals heterostructures thermal radiation electron–phonon interaction

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Solid-State Hydrogen Storage Properties of Ti-V-Nb-Cr High-Entropy Alloys and the Associated Effects of Transitional Metals(M=Mn,Fe,Ni)

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1113-1122页

作者： Bo Cheng Yunkai li xiaoxi li Huibin Ke liang Wang Tangqing Cao Di Wan Benpeng Wang Yunfei Xue Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314019China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China Department of Mechanical and Industrial Engineering Norwegian University of Science and Technology7491TrondheimNorway

Recently,high-entropy alloys(HEAs)designed by the concepts of unique entropy-stabilized mechanisms,started to attract widespread interests for their hydrogen storage properties.HEAs with body-centered cubic(BCC)structures present a high potential for hydrogen storage due to the high hydrogen-to-metal ratio(up to H/M=2)and vastness of compositions.Although many studies reported rapid absorption kinetics,the investigation of hydrogen desorption is missing,especially in BCC HEAs.We have investigated the crystal structure,microstructure and hydrogen storage performance of a series of HEAs in the Ti-V-Nb-Cr system.Three types of TiVCrNb HEAs(Ti_(4)V_(3)NbCr_(2),Ti_(3)V_(3)Nb2Cr_(2),Ti_(2)V_(3)Nb_(3)Cr_(2))with close atomic radii and different valence electron concentrations(VECs)were designed with single BCC phase by CALPHAD method.The three alloys with fast hydrogen absorption kinetics reach the H/M ratio up to 2.Particularly,Ti_(4)V_(3)NbCr_(2)alloy shows the hydrogen storage capacity of 3.7 wt%,higher than other HEAs ever reported.The dehydrogenation activation energy of HEAs’hydride has been proved to decrease with decreasing VEC,which may be due to the weakening of alloy atom and H atom.Moreover,Ti_(4)V_(3)NbCr_(2)M(M=Mn,Fe,Ni)alloys were also synthesized to destabilize hydrides.The addition of Mn,Fe and Ni lead to precipitation of Laves phase,however,the kinetics did not improve further because of their own excellent hydrogen absorption.With increasing the content of Laves phase,there appear more pathways for hydrogen desorption so that the hydrides are more easily dissociated,which may provide new insights into how to achieve hydrogen desorption in BCC HEAs at room temperature.

关键词： High-entropy alloy Hydrogen storage CALPHAD Hydride stability Hydrogen sorption kinetics

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Nanoparticles targeting at methylases with high correlation to N^(6)-methyladenosine-related lncRNA signatures as potential therapy of kidney clear cell carcinoma

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Chinese Chemical Letters 2022年第10期33卷 4610-4616页

作者： Ruixuan Chen Ping Ouyang licong Su Xi Xu Penghu lian Yanqin li Qi Gao Yifan Zhang Sheng Nie Fan Luo Ruqi Xu Xiaodong Zhang xiaoxi li Yue Cao Peiyan Gao Juanjuan Kang Jun Wu Lu li National Clinical Research Center for Kidney Disease State Key Laboratory of Organ Failure ResearchGuangdong Provincial Clinical Research Center for Kidney DiseaseNanfang HospitalSouthern Medical UniversityGuangzhou 510000China Department of Health Management Nanfang HospitalSouthern Medical UniversityGuangzhou 510000China Department of Hematology Nanfang HospitalSouthern Medical UniversityGuangzhou 510000China Department of Urology Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical College(CAMS&PUMC)Beijing 100730China Department of Urology Nanfang HospitalSouthern Medical UniversityGuangzhou 510000China Affiliated Foshan Maternity&Child Healthcare Hospital Southern Medical UniversityFoshan 528000China School of Biomedical Engineering Sun Yat-sen UniversityShenzhen 518107China Department of Radiation Oncology Nanfang HospitalSouthern Medical UniversityGuangzhou 510000China

Clear cell renal cell carcinoma(ccRCC)is a heterogeneous malignancy with poor prognosis.Methylation of the N^(6) position of adenosine(m^(6)A),the most common epigenetic modification in both messenger RNAs and noncoding RNAs,has been reported to regulate the initiation and progression of ccRCC.However,whether and how m^(6)A-related long noncoding RNAs(m^(6)ArlncRNAs)signify the progression of ccRCC remain unclear.We found m^(6)ArlncRNAs are effective signatures illustrating immune landscape and risk stratification in ccRCC.We identified two differently expressed m^(6)ArlncRNAs(DEm^(6)ArlncRNAs),AC008870.2 and EMX2OS,as independent risk factors for overall survival of ccRCC patients,by applying stringent variable selection procedure to data from the Cancer Genome Atlas Kidney Renal Clear Cell Carcinoma project.The risk score generated from the DEm^(6)ArlncRNA expression categorizes patients into either high or low-risk groups,between which,enrichment analysis indicated an enrichment in immune-related pathways.Under different DEm^(6)ArlncRNA transcription pattern,the two risk groups differ in immune cell population composition and expression levels of therapy targeting genes.Nanoparticle is satisfactory strategy to delivering therapeutic drugs.For further clinical translation,we designed a novel nanoparticle delivery system packaged STM2457(STM@8P4 NPs),which selectively inhibits AC008870.2-correlated m^(6)A writer.STM@8P4 NPs loaded drug successfully with uniform particle size,long-term stability and high release efficiency.STM@8P4 NPs can easily enter ccRCC cells and showed a highly efficient ccRCC killing activity in vitro.Our results therefore indicate that m^(6)ArlncRNAs expression can depict tumor microenvironment,predict prognosis for ccRCC patient and give hint to therapeutic strategies in ccRCC.

关键词： Nanoparticle Methylation Long noncoding RNA Clear cell renal carcinoma Immunotherapy

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A monolithically sculpted van der Waals nano-opto-electro-mechanical coupler

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light(Science & Applications) 2022年第3期11卷 76-85页

作者： Tongyao Zhang Hanwen Wang Xiuxin Xia Ning Yan Xuanzhe Sha Jinqiang Huang Kenji Watanabe Takashi Taniguchi Mengjian Zhu Lei Wang Jiantou Gao Xilong liang Chengbing Qin liantuan Xiao Dongming Sun Jing Zhang Zheng Han xiaoxi li State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Material Science and Engineering University of Science and Technology of ChinaAnhui 230026China Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China The Key Laboratory of Science and Technology on Silicon Devices Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China The University of Chinese Academy of Sciences Beijing 100029China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China

The nano-opto-electro-mechanical systems(NOEMS)are a class of hybrid solid devices that hold promises in both classical and quantum manipulations of the interplay between one or more degrees of freedom in optical,electrical and mechanical modes.To date,studies of NOEMS using van der Waals(vdW)heterostructures are very limited,although vdW materials are known for emerging phenomena such as spin,valley,and topological physics.Here,we devise a universal method to easily and robustly fabricate vdW heterostructures into an architecture that hosts opto-electro-mechanical couplings in one single device.We demonstrated several functionalities,including nano-mechanical resonator,vacuum channel diodes,and ultrafast thermo-radiator,using monolithically sculpted graphene NOEMS as a platform.Optical readout of electric and magnetic field tuning of mechanical resonance in a CrOCl/graphene vdW NOEMS is further demonstrated.Our results suggest that the introduction of the vdW heterostructure into the NOEMS family will be of particular potential for the development of novel lab-on-a-chip systems.

关键词： monolithic tuning resonator

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High-Performance Organic Field-Effect Transistors Based on Two-Dimensional Vat Orange 3 Crystals

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Chinese Physics Letters 2024年第2期41卷 122-128页

作者：闫宁熊志仁秦成兵李小茜 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China

The exploration and research of low-cost,environmentally friendly,and sustainable organic semiconductor materials are of immense significance in various fields,including electronics,optoelectronics,and energy conversion.Unfortunately,these semiconductors have almost poor charge transport properties,which range from∼10^(−4) cm^(2)·V^(−1)·s^(−1) to∼10^(−2) cm^(2)·V^(−1)·s^(−1).Vat orange 3,as one of these organic semiconductors,has great potential due to its highly conjugated structure.We obtain high-quality multilayered Vat orange 3 crystals with two-dimensional(2D)growth on h-BN surfaces with thickness of 10–100 nm using physical vapor transport.Raman’s results confirm the stability of the chemical structure of Vat orange 3 during growth.Furthermore,by leveraging the structural advantages of 2D materials,an organic field-effect transistor with a 2D vdW vertical heterostructure is further realized with h-BN encapsulation and multilayered graphene contact electrodes,resulting in an excellent transistor performance with On/Off ratio of 104 and high field-effect mobility of 0.14 cm^(2)·V^(−1)·s^(−1).Our results show the great potential of Vat orange 3 with 2D structures in future nano-electronic applications.Furthermore,we showcase an approach that integrates organic semiconductors with 2D materials,aiming to offer new insights into the study of organic semiconductors.

关键词： transistor orange semiconductors

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Down-Regulation of TLR9 Expression Affects the Maturation and Function of Murine Bone Marrow-Derived Dendritic Cells Induced by CpG

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Cellular & Molecular Immunology 2009年第3期6卷 199-205页

作者： ling Ma Guangfeng Zhao Chunyan Hua xiaoxi li Xiaoyin Zhao lingyun Sun Yayi Hou Immunology and Reproductive Biology Lab Medical School ＆ State Key Laboratory of Pharmaceutical Biotechnology Nanjing University Nanjing 210093 China The affiliated Drum Tower Hospital of Nanjing University Medical School Nanjing 210008 China

Toll-like receptor 9 （TLR9） is expressed intracellularly by dendritic cells （DCs） and specifically recognizes unmethylated CpG motif. Recognition of TLR9 to CpG DNA can induce DC maturation followed by the subsequent immune responses. Here, RNA interference （RNAi） was used to identify the effect of CpG DNA signaling on DC function. The results showed that transfection of DCs with siRNA specific for TLR9 gene significantly down-regulated TLR9 expression. Immature DCs transfected with TLR9 siRNA did not differentiate into mature DCs with exposure to CpG. TLR9 siRNA-treated DCs expressed low levels of MHC II and CD40 without reducing endocytosis. Furthermore, TLR9 siRNA-transfected DCs exhibited a decreased allostimulatory capacity in a lymphocyte proliferation assay and attenuated Thl responses by decreasing IL-12p70 production. Our findings indicate that siRNA in silencing TLR9 gene in DCs may offer a potential tool to study the TLR9-CpG pathway.

关键词： DC RNA interference TLR9 CpG

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Pledgee competition, strategic disclosure, and future crash risk

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China Journal of Accounting Research 2019年第3期12卷 271-291页

作者： xiaoxi li Jing liu Kemin Wang School of Management Jinan UniversityChina School of Accounting Capital University of Economics and BusinessChina School of Management Fudan UniversityChina

We investigate whether pledgee competition affects the disclosure choice of firms whose controlling shareholders pledge their shares.We find that pledgee competition is positively related to pledge firms’ annual report tone management.This positive relationship is stronger for pledge firms with lower credit quality and non-state-owned enterprise pledge firms.Further corroborating our results, higher pledgee competition increases the future crash risk of pledge firms.Collectively, our results suggest that competition pressure induces pledgees to lower their monitoring incentives to remain competitive in the marketplace, thus leading to pledge firms’ bad news hoarding behavior.

关键词： Share pledge Pledgee competition Tone management

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Overexpression of estrogen receptor beta alleviates the toxic effects of beta-amyloid protein on PC12 cells via non-hormonal ligands

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Neural Regeneration Research 2012年第14期7卷 1095-1100页

作者： Hui Wang lihui Si xiaoxi li Weiguo Deng Haimiao Yang Yuyan Yang Yan Fu Department of Gynaecology and Obstetrics First Hospital of Jilin University Changchun 130021 Jilin Province China Department of Gynaecology and Obstetrics Second Hospital of Jilin University Changchun 130044 Jilin Province China Department of Gynaecology Affiliated Hospital of Changchun University of Traditional Chinese Medicine Changchun 130021 Jilin Province China Department of Children＇s Heatlh School of Public Health Jilin Univeristy Changchun 130021 China Department of Scientific Research Affiliated Hospital of Changchun University of Traditional Chinese Medicine Changchun 130021 China Department of Gynaecology and Obstetrics Minzu Hospital of Yitong County Yitong 130700 Jilin Province China

After binding to the estrogen receptor, estrogen can alleviate the toxic effects of beta-amyloid protein, and thereby exert a therapeutic effect on Alzheimer＇s disease patients. Estrogen can increase the incidence of breast carcinoma and endometrial cancer in post-menopausal women, so it is not suitable for clinical treatment of Alzheimer＇s disease. There is recent evidence that the estrogen receptor can exert its neuroprotective effects without estrogen dependence. Real-time quantitative PCR and flow cytometry results showed that, compared with non-transfected PC12 cells, adenovirus-mediated estrogen receptor β gene-transfected PC12 cells exhibited lower expression of tumor necrosis factor a and interleukin 1β under stimulation with beta-amyloid protein and stronger protection from apoptosis. The Akt-specific inhibitor Abi-2 decreased the anti-inflammatory and anti-apoptotic effects of estrogen receptor β gene-transfection. These findings suggest that overexpression of estrogen receptor β can alleviate the toxic effect of beta-amyloid protein on PC12 cells, without estrogen dependence. The Akt pathway is one of the potential means for the anti-inflammatory and anti-apoptotic effects of the estrogen receptor.

关键词： estrogen estrogen receptor β Alzheimer＇s disease beta-amyloid protein adenovirus neural regeneration

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基于全域连通性识别气候变化风险下的生物多样性保护优先区--以京津冀为例

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生态学报 2024年第3期44卷 1152-1163页

作者：李怡啸欧小杨李昊冉程哲李晓溪郑曦北京林业大学园林学院北京100083

在保护优先区规划中,有必要考虑气候变化的潜在风险并关注物种在气候驱动下的扩散格局。基于未来生物气候数据、地形多样性数据以及土地利用数据,应用Omniscape算法,对21世纪中叶(2040—2061年)气候变化情景下京津冀地区陆生哺乳动物的... 详细信息

在保护优先区规划中,有必要考虑气候变化的潜在风险并关注物种在气候驱动下的扩散格局。基于未来生物气候数据、地形多样性数据以及土地利用数据,应用Omniscape算法,对21世纪中叶(2040—2061年)气候变化情景下京津冀地区陆生哺乳动物的扩散进行全域连通性建模并与当前情景对比分析,识别出生物多样性保护优先区。结果表明:区域尺度下,气候变化风险使得高连通性的区域逐渐从平原向山区转移,分布趋于集中;斑块尺度下,林缘连通性较高,而位于林地或草地边缘的耕地连通性低。在此基础上,共识别生物多样性保护优先区共51786 km^(2),其中涵养区(占56.4%)在当前和未来的连通状况均较为良好;优化区(占38.4%)应提升生境质量以满足未来连通性的更高需求;而修复区(占5.22%)面临的气候变化风险较高,亟需进行生态修复以免在未来出现连通性夹点。本研究通过评估京津冀地区两种情景下的全域连通格局,为生物多样性保护的气候适应性规划提供了科学依据。

关键词：保护优先区生物多样性气候变化连通性京津冀地区

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Surface plasmon assisted high-performance photodetectors based on hybrid TiO_(2)@GaO_(x)N_(y)-Ag heterostructure

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Journal of Semiconductors 2023年第7期44卷 45-53页

作者： Jiajia Tao Guang Zeng xiaoxi li Yang Gu Wenjun liu David Wei Zhang Hongliang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan Univer-sityShanghai 200433China Jiashan Fudan Institute Jiaxing 314100China

In this work,we reported a high-performance-based ultraviolet-visible(UV-VIS)photodetector based on a TiO_(2)@GaO_(x)N_(y)-Ag heterostructure.Ag particles were introduced into TiO_(2)@GaO_(x)N_(y)to enhance the visible light detection perfor-mance of the heterojunction device.At 380 nm,the responsivity and detectivity of TiO_(2)@GaO_(x)N_(y)-Ag were 0.94 A/W and 4.79×109 Jones,respectively,and they increased to 2.86 A/W and 7.96×1010 Jones at 580 nm.The rise and fall times of the response were 0.19/0.23 and 0.50/0.57 s,respectively.Uniquely,at 580 nm,the responsivity of fabricated devices is one to four orders of magnitude higher than that of the photodetectors based on TiO_(2),Ga_(2)O_(3),and other heterojunctions.The excellent optoelectronic characteristics of the TiO_(2)@GaO_(x)N_(y)-Ag heterojunction device could be mainly attributed to the synergistic effect of the type-Ⅱband structure of the metal-semiconductor-metal heterojunction and the plasmon resonance effect of Ag,which not only effectively promotes the separation of photogenerated carriers but also reduces the recombination rate.It is fur-ther illuminated by finite difference time domain method(FDTD)simulation and photoelectric measurements.The TiO_(2)@GaO_(x)N_(y)-Ag arrays with high-efficiency detection are suitable candidates for applications in energy-saving communica-tion,imaging,and sensing networks.

关键词： TiO_(2)@GaO_(x)N_(y)-Ag ultraviolet-visible photodetector type-Ⅱband structure plasmon resonance effect

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