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The Nano Research Young Innovators(NR45)Awards in twodimensional materials

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Nano Research 2021年第6期14卷 1575-1582页

作者： xiangfeng duan Qihua Xiong Department of Chemistry University of CaliforniaLos AngelesLos AngelesCA90095USA State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing100084China Beijing Academy of Quantum Information Sciences Beijing100193China

Nano Research launched the Nano Research Young Innovator Awards(NR45)program in 2018 to feature young researchers under the age of 45 in various fields of nanoscience and nano-technology,in recognition of their distinguished accomplishments and/or potential to make substantial contributions to their *** NR45 awardees were selected through a competitive process by an award committee from the journal's editorial *** 2021 NR45 Awards focus on the topic area of two-dimensional(2D)materials,and highlight 35 innovators in cognitions of their extraordinary contributions to this rapidly expanding *** to all the 35 outstanding young innovators!

关键词： journal accomplishment award

Graphene-based vertical thin film transistors

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Science China(Information Sciences) 2020年第10期63卷 42-53页

作者： Liting LIU Yuan LIU xiangfeng duan Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan University Department of Chemistry and Biochemistry University of California

Vertical field effect transistors(VFETs), where the channel material is sandwiched between source-drain electrodes and the channel length is simply determined by its body thickness, have attracted considerable interest for high performance electronics owning to their intrinsic short channel length. To enable the effective gate modulation and current switching behavior, the electrode of conventional VFET is largely based on perforated metals, in which the gate electrical field could penetrate through. Recently,with the emerge of graphene, a new type of graphene based VFETs has been developed. With finite density of states and the weak electrostatic screening effect, graphene exhibits a field-tunable work-function and partial electrostatic transparency, it can thus function as an "active" contact with tunable graphene-channel junction, enabling entirely new transistor functions or higher device performance not previously *** this review, we discuss the research progresses of graphene-based VFET, including the its basic device structure, carrier transport mechanism, device performance and novel properties demonstrated.

关键词： graphene electrode vertical transistors thin film transistors van der Waals heterostructures

Van der Waals superlattices

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National Science Review 2022年第5期9卷 14-16页

作者： Huaying Ren Zhong Wan xiangfeng duan Department of Chemistry and Biochemistry University of California California Nano Systems Institute University of California

Semiconductor technology has enabled many essential devices,including transistors for computing and communication,diodes for solid-state lighting and *** all these devices,the material foundation is a series of highly elaborated heterostructures and superlattices[1].To this end,integrating different materials into heterostructures or superlattices with well-defined spatial modulation of chemical compositions and electronic structures is central for generating designed electronic functions and has been a continued pursuit of the materials science community.

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Holey graphene hydrogel with in-plane pores for high- performance capacitive desalination

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Nano Research 2016年第8期9卷 2458-2466页

作者： Weiqing Kong Xidong duan Yongjie Ge Hongtao Liu Jiawen Hu xiangfeng duan State Key Laboratory for Chemo/Biosensing and Chemometrics Department of Chemistry and Chemical Engineering Hunan University Changsha 410082 China College of Chemistry and Chemical Engineering Central South University Changsha 410083 China Department of Chemistry and Biochemistry University of Califomia Los Angeles CA 90095 USA

Capacitive deionization is an attractive approach to water desalination and treatment. To achieve efficient capacitative desalination, rationally designed electrodes with high specific capacitances, conductivities, and stabilities are necessary. Here we report the construction of a three-dimensional （3D） holey graphene hydrogel （HGH）. This material contains abundant in-plane pores, offering efficient ion transport pathways. Furthermore, it forms a highly interconnected network of graphene sheets, providing efficient electron transport pathways, and its 3D hierarchical porous structure can provide a large specific surface area for the adsorption and storage of ions. Consequently, HGH serves as a binder-free electrode material with excellent electrical conductivity. Cyclic voltammetry （CV） measurements indicate that the optimized HGH can achieve specific capacitances of 358.4 F.g 1 in 6 M KOH solution and 148 F.g-1 in 0.5 M NaCl solution. Because of these high capacitances, HGH has a desalination capadty as high as 26.8 mg.g-1 （applied potential： 1.2 V; initial NaCI concentration： -5,000 mg.L-l）.

关键词： capacitive deionization desalination electrochemical capacitor graphene hydrogel (GH) in-plane pore

Suppressed threshold voltage roll-off and ambipolar transport in multilayer transition metal dichalcogenide feed-back gate transistors

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Nano Research 2020年第7期13卷 1943-1947页

作者： Yang Liu Peiqi Wang Yiliu Wang Yu Huang xiangfeng duan Department of Chemistry and Biochemistry University of CaliforniaLos AngelesLos AngelesCA 90095USA Department of Materials Science and Engineering University of CaliforniaLos AngelesLos AngelesCA 90095USA California Nanosystems Institute University of CaliforniaLos AngelesLos AngelesCA 90095USA

The layered semiconducting transition metal dichaloogenides(S-TMDs)have attracted considerable interest as the channel material for field-effect transistors(FETs).However,the multilayer S-TMD transistors usually exhibit considerable threshold voltage(Vn)shit and ambipolar behavior at high source-drain bias,which is undesirable for modern digital *** we report the design and fabrication of double feedback gate(FBG)transistors,i.e.,source FBG(S-FBG)and drain FBG(D-FBG),to combat these *** FBG transistors differ from normal transistors by including an extra feedback gate,which is directly connected t0 the source/drain electrodes by extending and overlapping the source/drain electrodes over the yttrium oxide dielectrics on *** show that the S-FBG transistors based on mutilayer MoSg exhibit nearly negligible VIn rlloff at large source drain bias,and the D-FBG mutilayer WSe2 transistors could be tailored into either n-type or p-type transport,depending on the polarity of the drain *** double FBG structure offers an effective strategy to tailor multilayer s-TMD transistors with suppressed Vn roll-off and ambipolar transport for high-performance and low-power logic applications.

关键词： two-dimensional transition metal dichalcogenides feedback gate transistor threshold voltage roll-off ambipolar behavior tailoring

Selective growth of wide band gap atomically thin Sb2O3 inorganic molecular crystal on WS2

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Nano Research 2019年第11期12卷 2781-2787页

作者： Guangzhuang Sun Bo Li Shifa Wang Zhengwei Zhang Jia Li Xidong duan xiangfeng duan State Key Laboratory for Chemo/Biosensing and Chemometrics and Hunan Key Laboratory of Two Dimensional Materials College of Chemistry and Chemical EngineeringHunan UniversitChangsha 410082China Department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China School of Electronic and Information Engineering Chongqing Three Gorges UniversityChongqing Wanzhou 404000China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCalifornia 90095USA

Heterostructures combined by different individual two-dimensional(2D)materials are essential building blocks to realize unique electronic,optoelectronic properties and multifunctional *** date,the direct growth of 2D/2D atomic van der Waals heterostructures(vdWHs)have been extensively ***,the heterostructures from 2D inorganic molecular crystals and atomic crystals have been rarely *** we report two-step direct epitaxial growth of the inorganic molecular-atomic Sb2O3/WS2 *** thickness of Sb2O3 nanosheets on WS2 nanosheets can be tuned by variable growth *** growth behavior of Sb2O3 on WS2 was determined through *** images,Raman spectra,Raman mappings and selected-area electron diffraction(SAED),etc.,reveal that Sb2O3/WS2 heterostructures are vertically stacked with high crystal *** transport measurements demonstrate that the heterotransistors based on the heterostructures possess high current on/off ratio of 5 × 10^5,obvious gate-tunable and current rectification output *** characterizations show that the heterostructures have a clear photoresponse with high responsivity of 16.4 *** growth of vdWHs from 2D inorganic molecular-atomic crystals may open up new opportunities in 2D functional electronics and optoelectronics.

关键词： vapor phase epitaxy selective growth Sb2O3/WS2 heterostructures band alignment rectification effect

Chemical vapor deposition growth of single-crystalline cesium lead halide microplatelets and heterostructures for optoelectronic applications

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Nano Research 2017年第4期10卷 1223-1233页

作者： Yiliu Wang Xun Guan Dehui Li Hung-Chieh Cheng Xidong duan Zhaoyang Lin xiangfeng duan Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA 90095 USA State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Materials Science and Engineering University of California Los Angeles Los Angeles CA 90095 USA California NanoSystems Institute University of California Los Angeles Los Angeles CA 90095 USA

Organic-inorganic hybrid halide perovskites, such as CH3NHgPbI3, have emerged as an exciting class of materials for solar photovoltaic applications; however, they are currently plagued by insufficient environmental stability. To solve this issue, all-inorganic halide perovskites have been developed and shown to exhibit significantly improved stability. Here, we report a single-step chemical vapor deposition growth of cesium lead halide （CsPbX3） microcrystals. Optical microscopy studies show that the resulting perovskite crystals predominantly adopt a square-platelet morphology. Powder X-ray diffraction （PXRD） studies of the resulting crystals demonstrate a highly crystalline nature, with CsPbC13, CsPbBr3, and CsPbI3 showing tetragonal, monoclinic, and orthorhombic phases, respectively. Scanning electron microscopy （SEM） and atomic force microscopy （AFM） studies show that the resulting platelets exhibit well-faceted structures with lateral dimensions of the order of 10-50 μm, thickness around 1 μm, and ultra-smooth surface, suggesting the absence of obvious grain boundaries and the single-crystalline nature of the individual microplatelets. Photoluminescence （PL） images and spectroscopic studies show a uniform and intense emission consistent with the expected band edge transition. Additionally, PL images show brighter emission around the edge of the platelets, demonstrating a wave-guiding effect in high-quality crystals. With a well-defined geometry and ultra-smooth surface, the square platelet structure can function as a whispering gallery mode cavity with a quality factor up to 2,863 to support laser emission at room temperature. Finally, we demonstrate that such microplatelets can be readily grown on a variety of substrates, including silicon, graphene, and other two-dimensional materials such as molybdenum disulfide, which can readily allow the construction of heterostructure optoelectronic devices, including a graphene/perovskite/ graphene vertically-stacked pho

关键词： chemical vapor deposition inorganic perovskite microplatelets photoluminescence optical cavity photodetection

Highly sensitive detection of mercury（Ⅱ） ions with few-layer molybdenum disulfide

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Nano Research 2015年第1期8卷 257-262页

作者： Shan Jiang Rui Cheng Rita Ng Yu Huang xiangfeng duan Department of Chemistry and Biochemistry University of California Los Angeles California 90095 USA Department of Materials Science and Engineering University of California Los Angeles California 90095 USA California Nanosystems Institute University of California Los Angeles California 90095 USA

Two-dimensional （2D） layered transition metal dichalcogenide （TMD） materials （e.g., MoS2） have attracted considerable interest due to their atomically thin geometry and semiconducting electronic properties. With ultrahigh surface to volume ratio, the electronic properties of these atomically thin semiconductors can be readily modulated by their environment. Here we report an investigation of the effects of mercury（II）（Hg^2＋） ions on the electrical transport properties of few-layer molybdenum disulfide （MoS2）. The interaction between Hg^2＋ ions and few-layer MoS2 was studied by field-effect transistor measurements and photoluminescence. Due to a high binding affinity between Hg2. ions and the sulfur sites on the surface of MoS2 layers, Hg^2＋ ions can strongly bind to MoS2. We show that the binding of Hg^2＋ can produce a p-type doping effect to reduce the electron concentration in n-type few-layer MoS2. It can thus effectively modulate the electron transport and photoluminescence properties in few-layer MoS2. By monitoring the conductance change of few-layer MoS2 in varying concentration Hg2~ solutions, we further show that few-layer MoS2 transistors can function as highly sensitive sensors for rapid electrical detection of Hg^2＋ ion with a detection limit of 30 pM.

关键词： molybdenum disulfide 2D layered materials mercury doping effect sensors

On the occasion of the 80th birthday of Professor Yitai Qian:Celebrating 60 years of innovation in solid-state chemistry and nanoscience

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Nano Research 2021年第10期14卷 3337-3342页

作者： Shu-Hong Yu xiangfeng duan Yi Xie Peidong Yang Yadong Li Department of Chemistry University of Science and Technology of ChinaHefei 230026China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesLos AngelesCA 90095USA Department of Chemistry University of CaliforniaBerkeleyBerkeleyCA 94720USA Department of Chemistry Tsinghua UniversityBeijing 100084China

Professor Yitai Qian,a pioneer in nanomaterials,an academician of the Chinese Academy of Sciences(CAS)and a professor at the University of Science and Technology of China(USTC),has committed his entire career to the development of solid-state chemistry and nanoscience in *** is recognized for his pioneering contributions to the development of emerging high-Tc superconducting materials,and the development of solvothermal methodology for the synthesis of a wide range of low-dimensional *** the landmarking scientific advancements he has made in his own trailblazing research,*** has directly mentored more than 100 excellent PhD students,in addition to many more master and undergraduate students,many of them have gone on to become the leading scientists in China and worldwide in the field of nanoscience and *** exaggeration,the academic offspring and extended family of *** have contributed a substantial portion of nanoscience and nanotechnology development over the past several decades.

关键词： chemistry state solid