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Fano resonance boosted cascaded optical field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application

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light(Science & Applications) 2015年第1期4卷 330-336页

作者： Zhendong Zhu Benfeng Bai Oubo You qunqing li Shoushan Fan State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China TsinghuaFoxconn Nanotechnology Research Center Department of PhysicsTsinghua UniversityBeijing 100084China

Cascaded optical field enhancement(CFE)can be realized in some specially designed multiscale plasmonic nanostructures,in which the generation of extremely strong fields at nanoscale volume is crucial for many applications,for example,surface-enhanced Raman spectroscopy(SERS).In this paper,we propose a strategy for realizing a high-quality plasmonic nanoparticle-in-cavity(PIC)nanoantenna array,in which strong coupling between a nanoparticle(NP)dark mode with a high-order nanocavity bright mode can produce strong Fano resonance at the target *** Fano resonance can effectively boost the CFE in a PIC.A cost-effective and reliable nanofabrication method is developed using room temperature nanoimprinting lithography to manufacture high-quality PIC *** technique guarantees the generation of only one gold NP at the bottom of each nanocavity,which is crucial for the generation of the expected *** demonstrate the performance and application of the PIC array,the PIC array is employed as an active SERS substrate for detecting 4-aminothiophenol *** experimental SERS enhancement factor of 2×10^(7) is obtained,which verifies the field enhancement and the potential of this device.

关键词： cascaded optical field enhancement Fano resonance localized surface plasmon plasmonic nanoantenna surfaceenhanced Raman spectroscopy

Bidirectional micro-actuators based on eccentric coaxial composite oxide nanofiber

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Nano Research 2020年第9期13卷 2451-2459页

作者： Guang Wang He Ma Xiang Jin Hua Yuan Yang Wei qunqing li Kaili Jiang Shoushan Fan State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics and Tsinghua-Foxconn Nanotechnology Research CenterTsinghua UniversityBeijing 100084China College of Applied Science Beijing University of TechnologyBeijing 100124China Collaborative Innovation Center of Quantum Matter Beijing 100084China

It is of great importance to develop new micro-actuators with high performance by optimizing the structures and *** we develop a VO2/AI2O3/CNT eccentric coaxial nanofiber,which can be potentially applied as a *** specific eccentric coaxial structure was efficiently fabricated by conventional thin film deposition methodology with individual CNT *** by thermal and photothermal stimuli,the as-developed actuator delivers a bidirectional actuation behavior with large amplitudes and an ultra-fast response,〜2.5 mS.A tweezer can be further made by assembling two such nanofibers symmetrically onto a tungsten *** and unclamping can be realized by laser *** experimental and simulation investigations indicated that the actuation behaviors could be attributed to the nanostructured eccentric coaxial geometry,the thermal coefficient mismatch between layers and the fast phase transition of *** micro-actuators will have potentials in micro manipulators,nanoscaled switches,remote controls and other autonomous ***,a large variety of coaxial and eccentric coaxial nanofibers with various functions can also be developed,giving the as-developed methodology more opportunities.

关键词： carbon nanotube vanadium dioxide actuator nanofiber phase transition

Scanning electron microscopy imaging of single-walled carbon nanotubes on substrates

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Nano Research 2017年第5期10卷 1804-1818页

作者： Dongqi li Jin Zhang Yujun He Yan Qin Yang Wei Peng liu lina Zhang Jiaping Wang qunqing li Shoushan Fan Kaili Jiang State Key Laboratory o fLow-Dimensional Quantum Physics Department of Physics and Tsinghua-Fo~conn Nanotechnology Research Center Tsinghua University Beijing 100084 China Sunwoda Electronic Co. Ltd. Shenzhen 518108 China Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Carl Zeiss Shanghai Co. Ltd. Beijing Office No. 1221 North Area Building B 768 Creative Industry Park A-5 Xueyuan Rd. Haidian Dist. Beijing 100083 China Collaborative Innovation Center of Quantum Matter Beijing 100084 China

Scanning electron microscopy （SEM） plays an indispensable role in nanoscience and nanotechnology because of its high efficiency and high spatial resolution in characterizing nanomaterials. Recent progress indicates that the contrast arising from different conductivities or bandgaps can be observed in SEM images if single-walled carbon nanotubes （SWCNTs） are placed on a substrate. In this study, we use SWCNTs on different substrates as model systems to perform SEM imaging of nanomaterials. Substantial SEM observations are conducted at both high and low acceleration voltages, leading to a comprehensive understanding of the effects of the imaging parameters and substrates on the material and surface-charge signals, as well as the SEM imaging. This unified picture of SEM imaging not only furthers our understanding of SEM images of SWCNTs on a variety of substrates but also provides a basis for developing new imaging recipes for other important nanomaterials used in nanoelectronics and nanophotonics.

关键词： single-walled carbonnanotube scanning electronmicroscopy imaging surface charging

Metal-film-assisted ultra-clean transfer of single-walled carbon nanotubes

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Nano Research 2014年第7期7卷 981-989页

作者： Yujun He Dongqi li Tianyi li Xiaoyang lin Jin Zhang Yang Wei Peng liu lina Zhang Jiaping Wang qunqing li Shoushan Fan Kaili Jiang State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics & Tsinghua-Foxconn Nanotechnology ResearchCenter Tsinghua University Beijing 100084 China

Transfer printing of nanomaterials onto target substrates has been widely used in the fabrication of nanodevices, but it remains a challenge to fully avoid contamination introduced in the transfer process. Here we report a metal-film- assisted method to realize an ultra-clean transfer of single-walled carbon nanotubes （SWCNTs） mediated by poly（methyl methacrylate）（PMMA）. The amount of PMMA residue can be greatly reduced due to its strong physical adhesion to the metal film, leading to ultra-clean surfaces of both the SWCNTs and the substrates. This metal-film-assisted transfer method is efficient, nondestructive, and scalable. It is also suitable for the transfer of graphene and other nanostructures. Furthermore, the relatively low temperature employed allows this technique to be compatible with nanomaterial-based flexible electronics.

关键词： metal-film-assisted single-walled carbonnanotube transfer flexible substrate Schottky barrier

Influences of chemical reactions on polysulfide reduction reaction process on promotor surface in li-S batteries

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Nano Research 2024年第4期17卷 2712-2718页

作者： Yufeng Luo Zhenhan Fang Zixin Hong Shaorong Duan Haitao liu Hengcai Wu qunqing li Yuegang Zhang Shoushan Fan Wenhui Duan Jiaping Wang Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Frontier Science Center for Quantum Information Tsinghua UniversityBeijing 100084China

Polar promotors have been proven effective in catalyzing the polysulfide(PS)reduction reaction(PSRR)process in lithium-sulfur(li-S)***,the promotor surface tends to be poisoned due to the accumulation of insoluble discharging products of lithium disulfide(li_(2)S_(2))and lithium sulfide(li_(2)S)during li-S battery ***,we investigate the detailed PSRR mechanism on the surface of manganese sulfides(MnS)as a representative promoter by performing in-situ Raman mapping *** catalytic ability of MnS enables thorough electrochemical reduction of PSs to li_(2)S_(2) and li_(2)S on the MnS *** generated li_(2)S_(2) and li_(2)S then adsorb the dissolved PSs via chemical reactions among sulfur species during the subsequent PSRR *** phenomenon mitigates promotor poisoning and continuously improves the reversible ***,the assembled li-S cell demonstrates excellent electrochemical performance after introducing a conductive interlayer containing a thin piece of carbon nanotube film and MnS promotors.

关键词： promotors polysulfides chemical reactions catalytic ability in-situ Raman measurements

In Situ TEM Observation of the Gasification and Growth of Carbon Nanotubes Using Iron Catalysts

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Nano Research 2011年第8期4卷 767-779页

作者： Xiaofeng Feng See Wee Chee Renu Sharma Kai liu Xu Xie qunqing li Shoushan Fan Kaili Jiang Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University Beijing 100084 China Leroy Eyring Center for Solid State Science Arizona State University Tempe AZ 85287 USA Present address： Department of Materials Science and Engineering University of California Berkeley CA 94720 USA Present Address： Department of Materials Science and Engineerig Rensselaer Polytechnic Institute Troy NY 12180 USA Present address： National Institute of Science and Technology Gaithersburg MD 20899 USA Present address： Department of Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 USA

We report the in situ transmission electron microscope (TEM) observation of the catalytic gasification and growth of carbon nanotubes (CNTs). It was found that iron catalysts can consume the CNTs when pumping out the precursor gas, acetylene, at the growth temperature, and reinitiate the growth when acetylene is re-introduced. The switching between gasification and growth of CNTs can be repeated many times with the same catalyst. To understand the phenomenon, thermogravimetric analysis (TGA) coupled with mass spectroscopy was used to study the mechanism involved. It was shown that the residual water molecules in the growth chamber of the TEM react with and remove carbon atoms of CNTs as carbon monoxide vapor under the action of the catalyst, when the precursor gas is pumped out. This result contributes to a better understanding of the water-assisted and oxygen-assisted synthesis of CNT arrays, and provides useful clues on how to extend the lifetime and improve the activity of the catalysts.

关键词： Carbon nanotubes gasification growth iron catalyst environmental transmission electron microscopy (ETEM),thermogravimetric analysis (TGA)

Stressed carbon nanotube devices for high tunability,high quality factor, single mode GHz resonators

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Nano Research 2018年第11期11卷 5812-5822页

作者： Xinhe Wang Dong Zhu Xinhe Yang Long Yuan Haiou li Jiangtao Wang Mo Chen Guangwei Deng Wenjie liang qunqing li Shoushan Fan Guoping Guo Kaili Jiang State Key Laboratory of Low-Dimensional Quantum Physics Dept. of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University Beijing 100084 China Key Laboratory of Quantum Information CAS University of Science and Technology of China Hefei230026 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China Fert Beijing Research Institute School of Electrical and Information Engineering BDBC Beihang University Beijing I O019 I China Collaborative Innovation Center of Ouantum Matter Beijing 100084 China

The emerging applications of nanoelectromechanical systems (NEMS) in ground-state cooling, quantum manipulation, communication devices, etc., call for a nanoresonator with high frequency, quality factor, and tunability, as well as easy integration. Here we show that such a nanoresonator can be achieved by using a unique assembly technique that transfers the stressed inner shell of carbon nanotubes (CNTs) to a self-aligned device geometry. The as-fabricated nanoresonator shows excellent comprehensive performance, i.e., high frequency (2-3 GHz), high tunability (80-110 MHz/V), high quality factor (3 x 10(4)), and single mode operation. The defect-free nature of the inner shell of the CNT gives rise to a high quality factor, and the preloaded tension improves the resonant frequency and tunability. This resonator with excellent performance also enables the integration of homogeneous devices and will play a key role in the emerging applications of NEMS.

关键词： carbon nanotube nanomechanical resonator stress high tunability high frequency

Active coherent control of nanoscale light confinement：Modulation of plasmonic modes and position of hotspots for surface-enhanced Raman scattering detection

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Nano Research 2017年第9期10卷 2934-2943页

作者： Zhendong Zhu Qixia Wang Fa Zeng Oubo You Sitian Gao Benfeng Bai Qiaofeng Tan Guofan Jin qunqing li Shoushan Fan Wei li Yushu Shi Xueshen Wang Division ofNano Metrology and Materials Measurement National Institute ofMetrology Beijing 100028 China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing 100084 China Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University Beijing 100084 China Laser Fusion Research Center China Academic of Engineering Physics Mianyang 621900 China

Multistep plasmonic nanostructures can induce the deep modulation of electromagnetic-field interactions on the nanoscale for positioning hotspots, and this generation of enhanced fields is important in many optical applications. In this article, a new strategy is proposed for fabricating a plasmonic doublestacked nanocone (DSC) nanostructure. In the DSC structure, a tunable plasmonic hybrid mode proceeds from the strong coupling of the plasmonic resonance of a fundamental cavity mode with a localized surface plasmon gap mode. In the nanostructure, the far-field response is deeply modulated and the hottest spots can be effectively positioned on the top surface of the DSC nanostructure. A controllable and cost-effective mask-reconfiguration technique for manufacturing the multiscale nanostructure is developed, which guarantees the generation of the introduced crucial stage on the DSC nanostructure. To evaluate the features of the plasmonic resonance, the DSC nanostructure is used as a surface-enhanced Raman scattering (SERS) substrate for detecting 4-mercaptopyridine molecules under specific excitation conditions. Its good performance, with an average measured SERS enhancement factor as high as 108, demonstrates its strong plasmonic-mode hybridization and extreme field enhancement.

关键词： surface plasmons mode hybridization positioning hotspot double-stacked nanocone (DSC) nanostructure surface-enhanced Raman scattering (SERS)

Freestanding macroscopic metal-oxide nanotube films derived from carbon nanotube film templates

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Nano Research 2015年第6期8卷 2024-2032页

作者： He Ma Yang Wei Jiangtao Wang Xiaoyang lin WenyunWu Yang Wu ling Zhang Peng liu Jiaping Wang qunqing li Shoushan Fan Kaili Jiang State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics & Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University Beijing 100084 China

Aligned carbon nanotube films coated with amorphous carbon were developed into novel templates by atomic layer deposition. Freestanding macroscopic metal-oxide nanotube films were then successfully synthesized by using these templates. The reactive amorphous carbon layer greatly improved the nuclei density, which ensured the high quality of the films and allowed for precise control of the wall thickness of the nanotubes. Using template-synthesized alumina nanotube films, we demonstrate a humidity sensor with a high response speed, a transmission electron microscopy （TEM） grid, and a catalyst support. The cross- stacked assembly, ultrathin thickness, chemical inertness, and high thermal stability of the alumina nanotube films contributed to the excellent performance of these devices. In addition, it is expected that the metal-oxide nanotube films would have significant potential owing to their material richness, macroscopic appearance, flexibility, compatibility with the semiconducting technologies, and the feasibility of mass production.

关键词： metal-oxide nanotube film atomic layer deposition carbon nanotube humidity sensor catalyst support