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Position-sensitive detectors based on two-dimensional materials

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Nano Research 2021年第6期14卷 1889-1900页

作者： Wenhui Wang Junpeng Lu zhenhua ni School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing211189China

Two-dimensional(2D)materials have attracted great attention in optoelectronics because of their unique structure,optical and electrical *** high-performance photodetectors and implementing their applications are eager to promote the development of 2D ***-sensitive detector(PSD)is an optical inspection device for the precise measurements of position,distance,angle,and other relevant physical *** is a widely used component in the fields of tracking,aerospace,nanorobotics,and so ***,PSD is also a photodetector based on the lateral photovoltaic effect(LPE).This article reviews recent progress in high-performance PSD based on 2D *** high-sensitive photodetectors and LPE involved in 2D photodetectors are firstly ***,we introduce the research progress of PSD based on 2D materials and analyze the carrier dynamics in different device ***,we summarize the functionalities and applications of PSD based on 2D materials,and highlight the challenges and opportunities in this research area.

关键词： two-dimensional(2D)materials graphene photodetector lateral photovoltaic effect position-sensitive detector heterojunction

Synthesis of Fe_3O_4 nanoparticles by wet milling iron powder in a planetary ball mill

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China Particuology 2007年第5期5卷 357-358页

作者： Ding Chen Song ni zhenhua Chen Institute for Materials Research Hunan University Changsha 410082 China

Fe3O4 nanoparticles with sizes ranging from 30 to 80 nm were synthesized by wet milling iron powders in a planetary ball mill. The phase composition and the morphologies of the as-synthesized products were measured by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. Nanosized Fe3O4 particles were prepared by wet milling metallic iron powder （-200 mesh, 99%） in a planetary ball mill equipped with stainless steel vials using iron balls under distilled water with a ball-to-powder mass ratio of 50：1 and at a rotation speed of 300 rpm. The use of the iron balls in this method played a key role in Fe3O4 formation. The present technique is simple and the process is easy to carry out.

关键词： Fe3O4 Wet milling Planetary ball mill

How defects influence the photoluminescence of TMDCs

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Nano Research 2021年第1期14卷 29-39页

作者： Mengfan Zhou Wenhui Wang Junpeng Lu zhenhua ni School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing 211189China

Two-dimensional(2D)transition metal dichalcogenide(TMDC)monolayers,a class of ultrathin materials with a direct bandgap and high exciton binding energies,provide an ideal platform to study the photoluminescence(PL)of light-emitting *** thin TMDCs usually contain various defects,which enrich the lattice structure and give rise to many intriguing *** the influences of defects can be either detrimental or beneficial,a comprehensive understanding of the internal mechanisms underlying defect behaviour is required for PL ***,recent advances in the defect influences on PL emission are summarized and *** mechanisms are the focus of this review,such as radiative/nonradiative recombination kinetics and band structure *** challenges and opportunities are present in the field of defect manipulation,and the exploration of mechanisms is expected tofacilitate the applications of 2D TMDCs in the future.

关键词： two-dimensional material transition metal dichalcogenides(TMDCs) photoluminescence(PL) defect defect engineering quantum yield(QY)

Raman Spectroscopy and Imaging of Graphene

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Nano Research 2008年第4期1卷 273-291页

作者： zhenhua ni Yingying Wang Ting Yu Zexiang Shen Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Graphene has many unique properties that make it an ideal material for fundamental studies as well as for potential *** we review recent results on the Raman spectroscopy and imaging of *** show that Raman spectroscopy and imaging can be used as a quick and unambiguous method to determine the number of graphene *** strong Raman signal of single layer graphene compared to graphite is explained by an interference enhancement *** have also studied the effect of substrates,the top layer deposition,the annealing process,as well as folding(stacking order)on the physical and electronic properties of ***,Raman spectroscopy of epitaxial graphene grown on a SiC substrate is presented and strong compressive strain on epitaxial graphene is *** results presented here are highly relevant to the application of graphene in nano-electronic devices and help in developing a better understanding of the physical and electronic properties of graphene.

关键词： Graphene Raman spectroscopy and imaging substrate effect device application

Bi2O2Se/BP van der Waals heterojunction for high performance broadband photodetector

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Science China(Information Sciences) 2021年第4期64卷 142-148页

作者： Xing LIU Wenhui WANG Fang YANG Shaopeng FENG Zhenliang HU Junpeng LU zhenhua ni School of Physics Southeast University

Broadband photodetector has wide applications in the field of remote sensing,health monitoring and medical ***-dimensional（2D） materials with narrow bandgaps have shown enormous potential in broadband ***,the device performance is often restricted by the high dark ***,we demonstrate a high performance broadband photodetector by constructing Bi2O2Se/BP van der Waals *** device exhibits a p-n diode behavior with a current rectification ratio of ～*** from the low dark current of the heterojunction and the effective carrier separation,the device achieves the responsivity（R） of～500 A/W,～4.3 A/W and～2.3 A/W at 700 nm,1310 nm and 1550 nm,*** specific detectivity（D*） is up to ～2.8 × 1011Jones（700 nm）,～2.4 × 10～9 Jones（1310 nm）and ～1.3 × 10～9 Jones（1550 nm）.Moreover,the response time is ～9 ms,which is more than 20 times faster than that of individual BP（～190 ms） and Bi2O2Se（～180 ms） devices.

关键词： Bi$_{2}$O$_{2}$Se/BP van der Waals heterojunction broadband photodetector low dark current narrow bandgap

School of Physics,Southeast University

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Frontiers of physics 2021年第4期16卷 F0003-F0003,I0003页

作者： zhenhua ni Dean School of Physics Telephone

Overview Originated from the"Gezhi"department of Sanjiang Normal School established in 1904,the physics discipline of Southeast University(SEU)has evolved for more than one *** the past century,numerous distinguished scholars have either studied or worked in our school of physics and its predecessors,including ***-Shiung Wu,***-Hsun Wu,***-Yao Chao,and *** ***,the School of Physics in SEU is focusing on cutting edge scientific researches and first-class education.

关键词： Southeast School discipline

Probing the intrinsic optical quality of CVD grown MoS2

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Nano Research 2017年第5期10卷 1608-1617页

作者： Amina Zafar Haiyan Nan Zainab Zafar Zhangting Wu Jie Jiang Yumeng You zhenhua ni Department of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 211189 China Ordered Matter Science Research Center Southeast University Nanjing 211189 China

Optical emission efficiency of two-dimensional layered transition metal dichalcogenides （TMDs） is one of the most important parameters affecting their optoelectronic performance. The optimization of the growth parameters by chemical vapor deposition （CVD） to achieve optoelectronic-grade quality TMDs is, therefore, highly desirable. Here, we present a systematic photoluminescence （PL） spectroscopic approach to assess the intrinsic optical and crystalline quality of CVD grown MoS2 （CVD MoS2）. We propose the use of the intensity ratio between the PL measured in air and vacuum as an effective way to monitor the intrinsic optical quality of CVD MoS2. Low-temperature PL measurements are also used to evaluate the structural defects in MoS2, via defect-associated bound exciton emission, which well correlates with the field-effect carrier mobility of MoS2 grown at different temperatures. This work therefore provides a sensitive, noninvasive method to characterize the optical properties of TMDs, allowing the tuning of the growth parameters for the development of optoelectronic devices.

关键词： transition metaldichalcogenides MoS2 chemical vapor deposition photoluminescence defect mobility

Synergistic graphene/aluminum surface plasmon coupling for zinc oxide lasing improvement

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Nano Research 2017年第6期10卷 1996-2004页

作者： Qiuxiang Zhu Feifei Qin Junfeng Lu Zhu Zhu Haiyan Nan Zengliang Shi zhenhua ni Chunxiang Xu State Key Laboratory of Bioelectronics School of Biological Science & Medical Engineering Southeast University Nanjing 210096 China College of Communication and Electronic Engineering Hunan City University Yiyang 413000 China Department of Physics Southeast University Nanjing 210096 China

Collective oscillations of free electrons generate plasmons on the surface of a material. A whispering-gallery microcavity effectively confines the light field on its surface based on the total reflection from its internal wall. When these two kinds of electromagnetic waves meet each other, the stimulated emissions from an individual ZnO microrod were enhanced more than 50-fold and the threshold was reduced after the whispering-gallery microcavity was coated with a monolayer of graphene and A1 nanoparticles. The improvement of the lasing performance was attributed to the synergistic energy coupling of the graphene/A1 surface plasmons with ZnO excitons. The lasing characteristics and the coupling mechanism were investigated systematically.

关键词： ZnO microrod A1 nanoparticles graphene surface plasmons energy coupling

Temperature-sensitive and solvent-resistance hydrogel sensor for ambulatory signal acquisition in“moist/hot environment”

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Nano Research 2023年第7期16卷 10348-10357页

作者： Xinyu Qu Hanjun Sun Xiaolong Kan Bing Lei Jinjun Shao Qian Wang Wenjun Wang zhenhua ni Xiaochen Dong Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) School of Physical and Mathematical SciencesNanjing Tech University(NanjingTech)Nanjing 211816China School of Physical Science and Information Technology Liaocheng UniversityLiaocheng 252059China School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing 211189China School of Chemistry&Materials Science Jiangsu Normal UniversityXuzhou 221116China

To realize continuously and stably work in a“moist/hot environment”,flexible electronics with excellent humid resistance,antiswelling,and detection sensitivity are ***,a solvent-resistant and temperature-ultrasensitive hydrogel sensor was prepared by combining MXene and quaternized chitosan(QCS)with the binary polymer *** strong electrostatic interaction between the QCS chain and the poly(acrylic acid)(PAA)network endows the hydrogel stability against solvent erosion,high temperature,and high *** strong dynamic interaction between MXene and polymer matrix significantly improves the mechanical properties and sensing(strain and temperature)sensitivity of the *** hydrogel strain sensor exhibits a high gauge factor(5.53),temperature/humidity tolerance(equilibrium swelling ratio of 2.5%at 80℃),and excellent cycle stability,which could achieve a remote and accurate perception of complex human motion and environment fluctuation under aquatic ***,the hydrogel sensor exhibits impressive thermal response sensitivity(-3.183%/℃),ultrashort response time(<2.53 s),and a low detection limit(<0.5℃)in a wide temperature range,which is applied as an indicator of the body surface and ambient *** short,this study broadens the application scenarios of hydrogels in persistent extreme thermal and wet environments.

关键词： flexible electronics hydrogel sensor solvent-resistance underwater application