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Structural editing of layered transition metal carbides via chemical scissor-mediated intercalation

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Science China Materials 2023年第6期66卷 2525-2526页

作者： Xiangyuan Kong Congwei Tan hailin peng School of Physical Science and Engineering Beijing Jiaotong UniversityBeijing 100044China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Intercalation chemistry is a promising methodology that has been widely used to synthesize two-dimensional(2D) materials and their intercalated layered derivatives,predominantly through introducing non-native species into the van der Waals(vdW) *** tailoring guest-host interaction chemistry,the intercalated materials with tunable properties hold promise for fundamental studies of novel physical phenomena and applications ranging from transistors to supercapacitors,batteries,and sensors[1].

关键词： layered chemistry introducing

Vacancy Ordering and Lithium Insertion inⅢ_(2)Ⅵ_(3) Nanowires

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Nano Research 2009年第4期2卷 327-335页

作者： hailin peng Xiao Feng Zhang Ray DTwesten Yi Cui Department of Materials Science and Engineering Stanford UniversityStanfordCalifornia 94305USA Electron Microscope Division Hitachi High Technologies AmericaInc.5100 Franklin DrivePleasantonCalifornia 94588USA Gatan Inc. 5933 Coronado LanePleasantonCalifornia 94588USA

Superlattice structures resulting from vacancy ordering have been observed in many *** we report vacancy ordering behavior inⅢ_(2)Ⅵ_(3)*** formation of layer-like structural vacancies has been achieved during the synthesis of In_(2)Se_(3)nanowires through a vapor-transport *** In_(2)Se_(3)nanowires with small amounts of Ga during synthesis can completely change the structural vacancy ordering from a layer-like to a screw-like pattern for(In_(x)Ga_(1-x))_(2)Se_(3)*** atoms can fill in the layer-like structural vacancies of In_(2)Se_(3)nanowires and generate new types of vacancy and lithium atom ordering *** screw-patterned vacancies of(In_(x)Ga_(1-x))_(2)Se_(3)nanowires show reversible lithium *** results contribute to the understanding of structure property correlations ofⅢ_(2)Ⅵ_(3)materials used in lithium ion storage,photovoltaics,and phase change memory.

关键词： Nanowire(NW) vacancy ordering superlattice Ⅲ-Ⅵ lithium insertion

2D Bi_(2)O_(2)Se:An Emerging Material Platform for the Next-Generation Electronic Industry

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Accounts of Materials Research 2021年第9期2卷 842-853页

作者： Tianran Li hailin peng Center for Nanochemistry Beijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

CONSPECTUS:Silicon has been the dominant semiconductor for the microelectronics industry since the late *** Moore’s law,silicon-based integrated circuit(IC)technology evolved into a 5 nm node by the end of ***,silicon-based electronics face various challenges such as reduced carrier mobility and increased short-channel effects at sub-10 nm *** overcome these drawbacks,two-dimensional(2D)semiconductors are among the most competitive candidate materials for next-generation electronics,due to their intrinsic atomic thickness,flexibility,and dangling-bond-free *** all the 2D semiconductors,an air-stable and high-mobility 2D Bi_(2)O_(2)Se semiconductor,a novel ternary material,has some prominent advantages that make it particularly favorable in the electronics ***,it demonstrates ultrahigh carrier mobility,moderate band gap,outstanding stability,and excellent mechanical ***,it can react with oxygen plasma or oxygen at elevated temperatures to form a high-κnative oxide *** native oxide Bi2SeO5 forms an atomically sharp interface with Bi_(2)O_(2)Se and can directly serve as a gate ***_(2)O_(2)Se is also embodied with some interesting physical properties such as strong spin−orbit coupling,dimerized selenium vacancies,and *** advantage of these properties,researchers have fabricated high-performance electronic devices,including logic devices,optoelectronics,thermoelectrics,sensors,and memory *** this account,we will systematically review the structure of 2D Bi_(2)O_(2)Se,including its crystal structure,surface structure,point defects,and electronic band structure and how these structures can affect the electron transport in 2D Bi_(2)O_(2)*** will then discuss different approaches to synthesize this material including chemical vapor deposition(CVD),metal−organic chemical vapor deposition(MOCVD),molecular beam epitaxy(MBE),and the solution-assisted *** these meth

关键词： piezoelectric ferroelectric replace

A transparent, conducting tape for flexible electronics

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Nano Research 2016年第4期9卷 917-924页

作者： Ya Huang Suiyang Liao Jie Ren Bilal Khalid hailin peng Hui Wu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Transparent electrodes are essential components for optoelectronic devices such as displays and thin-film solar cells. Traditionally, the deposition of transparent conducting layers and the sealing of the device are separate steps. Here we report on a highly transparent, conductive, and flexible ＂tape＂, which can be obtained by transferring silver nanowire networks to conventional transparent tape. We utilized the viscidity of the tape to reduce the junction resistance between silver nanowires and further protect the nanowires from corrosion, oxidation and mechanical damage. By this simple method, we obtained a flexible tape with high transparency （-90% at 550 nm wavelength） and low sheet resistance （approaching 22 Ω.sq^-1）. The transparent tape can be attached and stuck firmly on complex surfaces, making the surface highly conductive. We demonstrated the use of the tape as both a conducting layer and a sealing layer for flexible electronics applications including in-situ temperature monitoring and electrochromic devices.

关键词： transparent electrode silver nanowires tape flexible electronics

Vertical graphene nanosheetsmodiBed Al current collectors for high-performance sodium-ion batteries

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Nano Research 2020年第7期13卷 1948-1954页

作者： Kexin Wang Chongzhen Wang Hao Yang Xiongbiao Wang Feng Cao Qinci Wu hailin peng Center for Nanochemistry(CNC) Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100094China

Rechargeable sodium-ion batteries(SIBs)are promising candidates for large-scale energy storage owing to their excellent high-power ***,Al-based current collectorsat both anodes and cathodes of SIBs,which widely influence the power properties of a variety of electrodes in SIBs,have rarely been ***,we demonstrate that vertical graphene nanosheets grown on commercial Al foil by the plasma-enhanced chemical vapor deposition(PECVD)method,form a robust connection with the carbon-based conductive network of the electrode,thereby significantly reducing the electrode current collector interfacial *** sodium vanadium phosphate(NVP)anodes with vertical graphenenanosheetmodified Al foil(G-AI)current collectors,the interfacial resistance between the electrode and current collector is reduced 20-fold compared with that in the case of Al *** G-AI current collector reduces the polarization and improves the rate capability compared with that of Al current collectors within both cathodes and anodes of *** a high rate of 5 C,the capacity retention of NVP cathode with G-AI current collector is 74%,which is much higher than that with AI foil(22%).We believe that the obtained results support the prospect for the widespread use of G-AI current collectors in the further improvement of high-power profiles of SIBs.

关键词： vertical graphene nanosheets sodium-ion batteries current collector interfacial resistance

Large-area chemical vapor deposition-grown monolayer graphene-wrapped silver nanowires for broad-spectrum and robust antimicrobial coating

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Nano Research 2016年第4期9卷 963-973页

作者： Chen Zhao Bing Deng Guanchu Chen Bo Lei Hong Hua hailin peng Zhimin Yan Department of Oral Medicine Peking University School of Stomatology Beijing 100081 China Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences . (BNLMS) College of Chemistry and Molecular Engin eefing Peking University Beijing 100871 China

New types of antimicrobial systems are urgently needed owing to the emergence of pathogenic microbial strains that gain resistance to antibiotics commonly used in daily life and medical care. In this study we developed for the first time a broad-spectrum and robust antimicrobial thin film coating based on large-area chemical vapor deposition （CVD）-grown graphene-wrapped silver nanowires （AgNWs）. The antimicrobial graphene/AgNW hybrid coating can be applied on commerdal flexible transparent ethylene vinyl acetate/polyethylene terephthalate （EVA/PET） plastic films by a full roll-to-roll process. The graphene/AgNW hybrid coating showed broad-spectrum antimicrobial activity against Gram-negative （Escherichia coli） and Gram-positive bacteria （Staphylococcus aureus）, and fungi （Candida albicans）. This effect was attributed to a weaker microbial attachment to the ultra-smooth graphene film and the sterilization capacity of Ag＋, which is sustainably released from the AgNWs and presumably enhanced by the electrochemical corrosion of AgNWs. Moreover, the robust antimicrobial activity of the graphene/AgNW coating was reinforced by AgNW encapsulation by graphene. Furthermore, the antimicrobial efficiency could be enhanced to -100% by water electrolysis by using the conductive graphene/AgNW coating as a cathode. We developed a transparent and flexible antimicrobial cover made of graphene/AgNW/EVA/PET and an antimicrobial denture coated by graphene/ AgNW, to show the potential applications of the antimicrobial materials.

关键词： graphene silver nanowires antimicrobial chemical vapor deposition (CVD) electrochemical corrosion

Visualizing fast growth of large single-crystalline graphene by tunable isotopic carbon source

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Nano Research 2017年第2期10卷 355-363页

作者： Luzhao Sun1 Li Lin Jincan Zhang Huan Wang hailin peng Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China

The fast growth of large single-crystalline graphene by chemical vapor deposition on Cu foil remains a challenge for industrial-scale applications. To achieve the fast growth of large single-crystalline graphene, understanding the detailed dynamics governing the entire growth process--including nucleation, growth, and coalescence is important; however, these remain unexplored. In this study, by using a pulsed carbon isotope labeling technique in conjunction with micro-Raman spectroscopy identification, we visualized the growth dynamics, such as nucleation, growth, and coalescence, during the fast growth of large single- crystalline graphene domains. By tuning the supply of the carbon source, a growth rate of 320 μm/min and the growth of centimeter-sized graphene single crystals were achieved on Cu foil.

关键词： large single-crystalline graphene fast growth isotope labelling carbon source

Investigation of black phosphorus as a nano-optical polarization element by polarized Raman spectroscopy

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Nano Research 2018年第6期11卷 3154-3163页

作者： Nannan Mao Shishu Zhang Jinxiong Wu Huihui Tian Juanxia Wu Hua Xu hailin peng Lianming Tong Jin Zhang Center for Nanochemistry Beijing National Laboratory for Molecular Sciences Key Laboratory for the Physics and Chemistry of Nanodevices State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 China School of Materials Science and Engineering Shaanxi Normal University Ki'an 770062 China

Manipulating the polarization of light at the nanoscale is essential for the development of nano-optical devices. Owing to its corrugated honeycomb structure, two-dimensional （2D） layered black phosphorus （BP） exhibits outstanding in-plane optical anisotropy with distinct linear dichroism and optical birefringence in the visible region, which are superior characteristics for ultrathin polarizing optics. Herein, taking advantage of polarized Raman spectroscopy, we demonstrate that layered BP with a nanometer thickness can remarkably alter the polarization state of a linearly-polarized laser and behave as an ultrathin optical polarization element in a BP-Bi2Se3 stacking structure by inducing the exceptionally polarized Raman scattering of isotropic Bi2Se3. Our findings provide a promising alternative for designing novel polarization optics based on 2D anisotropic materials, which can be easily integrated in micro- sized all-optical and optoelectronic devices.

关键词： black phosphorus polarizing optics linear dichroism birefringence two-dimensional layered crystals

Exploitation of Bi2O2Se/graphene van der Waals heterojunction for creating efficient photodetectors and short-channel field-effect transistors

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InfoMat 2019年第3期1卷 390-395页

作者： Congwei Tan Shipu Xu Zhenjun Tan Luzhao Sun Jinxiong Wu Tianran Li hailin peng Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesInstitute of Physical ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijingChina Academy for Advanced Interdisciplinary Studies Peking UniversityBeijingP.R.China

The formation of heterojunction within solid-state devices enables them with eventually high performances,but provides a challenge for material synthesis and device fabrication because strict conditions such as lattice match are ***,we show a facile method to fabricate a van der Waals(vdW)heterojunction between two-dimensional(2D)bismuth oxyselenide(Bi2O2Se)and graphene,during which the graphene is directly transferred to the Bi2O2Se and served as a lowcontract-resistant electrode with small work function mismatch(~50 meV).As an optoelectronic device,the Bi2O2Se/graphene vdW heterojunction allows for the efficient sensing toward 1200-nm incident *** the application of fieldeffect transistors(FETs),the short-channel(50 nm)sample can be synthesized by utilizing these two 2D materials(ie,channel:Bi2O2Se;drain/source terminal:graphene)and the n-type characteristic can be observed with the accordant field *** is confirmed that we show a simple way to prepare the vdW heterojunction which is aiming to the high-performance applications among optoelectronics and FETs.

关键词： Bi2O2Se graphene van der Waals heterojunctions