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Tunable near-infrared light emission from layered TiS_(3) nanoribbons

Frontiers of physics 2024年第4期19卷 103-111页

作者： Junrong Zhang Cheng Chen Yanming Wang Yang Lu Honghong Li Xingang Hou Yaning Liang Long Fang Du Xiang Kai Zhang Junyong Wang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Frontier Institute of Chip and System Fudan UniversityShanghai 200438China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China College of Energy&Power Engineering Inner Mongolia University of TechnologyHohhot 010051China

The low-dimensional light source shows promise in photonic integrated *** layered van der Waals material that exhibits luminescence in the near-infrared optical communication waveband is an essential component in on-chip light ***,the tunable near-infrared photoluminescence(PL)of the air-stable layered titanium trisulfide(TiS3)is *** with iodine particles as a transport agent,TiS3 grown by chemical vapor transport using sulfur powder as a transport agent has fewer sulfur vacancies,which increases the luminescence intensity by an order of *** PL emission wavelength can be regulated in the near-infrared regime by thickness *** addition,we observed an interesting anisotropic strain response of PL in layered TiS3 nanoribbon:a blue shift of PL was achieved when the uniaxial tensile strain was applied along the b-axis,while a negligible shift was observed when the strain was applied along the *** work reveals the tunable nearinfrared luminescent properties of TiS3 nanoribbons,suggesting their potential applications as near-infrared light sources in photonic integrated circuits.

关键词： titanium trisulfide near-infrared luminescence S-vacancy tunability strain engineering

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Deep-UV-photo-excited synaptic Ga_(2)O_(3) nano-device with low-energy consumption for neuromorphic computing

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Journal of Semiconductors 2025年第2期46卷 88-96页

作者： Liubin Yang Xiushuo Gu Min Zhou Jianya Zhang Yonglin Huang Yukun Zhao College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Lab of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Efficient Low-carbon Energy Conversion and Utilization of Jiangsu Provincial Higher Education Institutions School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China

Synaptic nano-devices have powerful capabilities in logic,memory and learning,making them essential compo-nents for constructing brain-like neuromorphic computing ***,we have successfully developed and demonstrated a synaptic nano-device based on Ga_(2)O_(3) nanowires with low energy *** 255 nm light stimulation,the biomimetic synaptic nano-device can stimulate various functionalities of biological synapses,including pulse facilitation,peak time-dependent plasticity and memory learning *** is found that the artificial synaptic device based on Ga_(2)O_(3) nanowires can achieve an excellent"learning-forgetting-relearning"*** transition from short-term memory to long-term memory and retention of the memory level after the stepwise learning can attribute to the great relearning functionality of Ga_(2)O_(3) ***,the energy consumption of the synaptic nano-device can be lower than 2.39×10^(-11) J for a synaptic ***,our device demonstrates exceptional stability in long-term stimulation and *** the applica-tion of neural morphological computation,the accuracy of digit recognition exceeds 90%after 12 training sessions,indicating the strong learning capability of the cognitive system composed of this synaptic ***,our work paves an effective way for advancing hardware-based neural morphological computation and artificial intelligence systems requiring low power consumption.

关键词： Ga_(2)O_(3)nanowires synaptic nano-device low energy consumption neural network

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AgAuSe quantum dots with absolute photoluminescence quantum yield of 87.2%:The effect of capping ligand chain length

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nano Research 2022年第9期15卷 8555-8563页

作者： Ziqiang Sun Cheng Liu Hongchao Yang Xiaohu Yang Yejun Zhang Hongzhen Lin Youyong Li Qiangbin Wang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nano-Bio Interface Division of Nanobiomedicine and i-LabSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China

Surface ligands of colloidal quantum dots(QDs)have a profound influence on their surface states,which has been verified in the studies of the effect of ligand head groups on the photoluminescence(PL)properties of ***,the investigation of the ligand chain length is ***,we systematically explored the effect of chain length on the Ag_(2)Se QDs by selecting three ligands,1-octanethiol(OTT),1-dodecanethiol(DDT),and 1-hexadecanethiol(HDT),with diverse chain *** found that the PL intensity of Ag_(2)Se QDs increased with the decrease of the ligand chain length due to the enhanced passivation of surface defects emerging from the robust QD-ligand interface binding affinity and the weaker hydrophobic chain–chain ***,AgAuSe QDs terminated with OTT were obtained by alloying parent OTT-Ag_(2)Se QDs with Au precursor with a record absolute PL quantum yield(PLQY)of 87.2%at 970 nm,facilitating ultrasensitive in vivo angiography imaging in a nude mouse *** expect that our finding of the important role of the ligand chain length on the optical properties of QDs will be suggestive to the design and synthesis of high-quality QDs,and also look forward to the clinical applications of the ultra-bright AgAuSe QDs.

关键词： quantum dots surface ligand ligand chain length photoluminescence quantum yield bioimaging

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Quantitative measurement of the charge carrier concentration using dielectric force microscopy

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Chinese Physics B 2023年第3期32卷 449-455页

作者：赖君奇陈博文邢志伟李雪飞陆书龙陈琪陈立桅 i-Lab CAS Center for Excellence in NanoscienceSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China In-situ Center for Physical Sciences School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The charge carrier concentration profile is a critical factor that determines semiconducting material properties and device *** force microscopy(DFM)has been previously developed to map charge carrier concentrations with nanometer-scale spatial ***,it is challenging to quantitatively obtain the charge carrier concentration,since the dielectric force is also affected by the ***,we quantitative measured the charge carrier concentration at the saturation mobility regime via the rectification effect-dependent gating ratio of *** measuring a series of n-type GaAs and GaN thin films with mobility in the saturation regime,we confirmed the decreased DFM-measured gating ratio with increasing electron *** with numerical simulation to calibrate the tip–sample geometry-induced systematic error,the quantitative correlation between the DFM-measured gating ratio and the electron concentration has been established,where the extracted electron concentration presents high accuracy in the range of 4×10^(16)–1×10^(18)cm^(-3).We expect the quantitative DFM to find broad applications in characterizing the charge carrier transport properties of various semiconducting materials and devices.

关键词： dielectric force microscopy charge carrier concentration quantitative measurement numerical simulation

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High-operating-temperature MWIR photodetector based on a InAs/GaSb superlattice grown by MOCVD

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Journal of Semiconductors 2022年第1期43卷 49-52页

作者： Xiujun Hao Yan Teng He Zhu Jiafeng Liu Hong Zhu Yunlong Huai Meng Li Baile Chen Yong Huang Hui Yang Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsCASSuzhou 215123China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China

We demonstrate a high-operating-temperature(HOT)mid-wavelength InAs/GaSb superlattice heterojunction in-frared photodetector grown by metal-organic chemical vapor *** crystalline quality and the near-zero lattice mis-match of a InAs/GaSb superlattice on an InAs substrate were evidenced by high-resolution X-ray *** a bias voltage of-0.1 V and an operating temperature of 200 K,the device exhibited a 50%cutoff wavelength of~4.9μm,a dark current dens-ity of 0.012 A/cm^(2),and a peak specific detectivity of 2.3×10^(9) cm·Hz^(1/2)/W.

关键词： HOT MWIR InAs/GaSb superlattice aluminum-free MOCVD

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通过砷取代调控黑磷带隙用于高性能光电探测器件

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Science China Materials 2023年第6期66卷 2364-2371页

作者：汪洋陈程唐梓铭陆欢曹水艳张伟易敏张凯刘衍朋郭万林 Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical Structuresand Institute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China

多层黑磷的带隙(~0.33 eV)覆盖~3.7微米光谱范围,在红外应用方面有巨大潜力.然而进一步降低带隙使其可用于远红外器件仍面临挑战.此外,黑磷材料及器件饱受空气稳定性差的困扰.因此,我们提出了同系物砷取代的策略,实现了对黑磷带隙的调... 详细信息

多层黑磷的带隙(~0.33 eV)覆盖~3.7微米光谱范围,在红外应用方面有巨大潜力.然而进一步降低带隙使其可用于远红外器件仍面临挑战.此外,黑磷材料及器件饱受空气稳定性差的困扰.因此,我们提出了同系物砷取代的策略,实现了对黑磷带隙的调控和稳定性的增强.通过优化化学气相传输的生长参数,我们制备出砷含量可控的毫米级黑磷母体.经扫描隧道显微镜和能谱分析,砷原子随机嵌入黑磷的主晶格中并保留了原有几近完美的晶格排列.对于60%砷含量的多层黑磷,其电学带隙降低至~0.16±0.02 eV并伴随强的p型掺杂.受益于较小的晶格畸变和强掺杂效应,基于砷取代黑磷的光电器件表现出高达约882 mA W^(-1)的光响应率,远超未取代的黑磷基光电器件(约314 mA W^(-1)).更为重要的是,砷取代的黑磷器件在暴露大气环境(温度~20℃;湿度~33%)48小时后未表现出明显的氧化迹象.本文为开发黑磷基、可长时间运行的光电探测器和光调制器件提供了新途径.

关键词：扫描隧道显微镜光电器件光电探测器件红外应用红外器件化学气相传输空气稳定性生长参数

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Chirally assembled plasmonic metamolecules from intrinsically chiral nanoparticles

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nano Research 2022年第10期15卷 9447-9453页

作者： Jiahao Pan Xiaoyao Wang Jinjin Zhang Qin Zhang Qiangbin Wang Chao Zhou School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nano-Bio Interface Suzhou Key Laboratory of Functional Molecular Imaging TechnologyDivision of Nanobiomedicine and i-labSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123China Jiangsu Key Laboratory of Thin Films School of Physical Science and TechnologySoochow UniversitySuzhou 215006China College of Materials Sciences and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

Significant chiroptical responses could be generated by chiral coupling of achiral plasmonic nanoparticles,or originated from intrinsically chiral plasmonic *** we create dimeric plasmonic metamolecules possessing both chiral coupling between nanoparticles and intrinsic chiroptical responses derived from nanoparticles *** plasmonic metamolecules are prepared by assembling helical plasmonic nanorods(HPNRs)with intrinsic chirality in chiral manners on DNA origami *** HPNRs with the same or opposite chirality,or one HPNR and one achiral gold nanorod,are coupled chirally into dimeric metamolecules with intriguing plasmonic circular dichroism(PCD).We found that both of the intrinsic chirality of constituent HPNRs and the chiral coupling contribute to the overall PCD while their weights are different in different metamolecules and vary in different wavelength range for a certain *** to conventional chiral plasmonic metamolecules from achiral nanoparticles,or discrete chiral nanoparticles,these metamolecules bring more dimensions for tailoring chiroptical responses and make it more flexible to design plasmonic nanodevices with custom PCD.

关键词： chiral plasmonics DNA origami plasmonic circular dichroism gold nanoparticle

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Manipulating exciton confinement for stable and efficient flexible quantum dot light-emitting diodes

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Photonics Research 2024年第9期12卷 1927-1936页

作者： XIAOYUN HU JIANFANG YANG YUFEI TU ZHEN SU FEI ZHU QINGQING GUAN ZHIWEI MA Key Laboratory of Oil and Gas Fine Chemicals Ministry of EducationCollege of Chemical EngineeringXinjiang UniversityUrumqi 830017China School of Telecommunications and Intelligent Manufacturing Sias UniversityXinzheng 451150China CAS Key Laboratory of Nano-Bio Interface Division of Nanobiomedicine and i-LabSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Flexible quantum dot light-emitting diodes(QLEDs)show great promise for the next generation of flexible,wearable,and artificial intelligence display ***,the performance of flexible QLEDs still lags behind that of rigid substrate devices,hindering their commercialization for display *** we report the superior performance of flexible QLEDs based on efficient red ZnCdSe/ZnS/ZnSe QDs(A-QDs)with antitype-I *** reveal that using ZnS as an intermediate shell can effectively confine the exciton wavefunction to the inner core,reducing the surface sensitivity of the QDs and maintaining its excellent emission *** flexible QLEDs exhibit a peak external quantum efficiency of 23.0%and a long lifetime of 63,050 h,*** anti-type-I nanostructure of A-QDs in the device simultaneously suppresses defectinduced nonradiative recombination and balances carrier injection,achieving the most excellent performance of flexible QLEDs ever *** study provides new insights into achieving superior performance in flexible QD-based electroluminescent devices.

关键词： diodes quantum light

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Light-stimulated low-power artificial synapse based on a single GaN nanowire for neuromorphic computing

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Photonics Research 2023年第10期11卷 1667-1677页

作者： MIN ZHOU YUKUN ZHAO XIUSHUO GU QIANYI ZHANG JIANYA ZHANG MIN JIANG SHULONG LU Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China

The fast development of the brain-inspired neuromorphic computing system has ignited an urgent demand for artificial synapses with low power consumption. In this work, it is the first time a light-stimulated low-power synaptic device based on a single GaN nanowire has been demonstrated successfully. In such an artificial synaptic device, the incident light, the electrodes, and the light-generated carriers play the roles of action potential,presynaptic/postsynaptic membrane, and neurotransmitter in a biological synapse, respectively. Compared to those of other synaptic devices based on GaN materials, the energy consumption of the single-GaN-nanowire synaptic device can be reduced by more than 92%, reaching only 2.72 × 10^(-12)J. It is proposed that the oxygen element can contribute to the synaptic characteristics by taking the place of the nitrogen site. Moreover, it is found that the dynamic “learning-forgetting” performance of the artificial synapse can resemble the behavior of the human brain, where less time is required to relearn the missing information previously memorized and the memories can be strengthened after relearning. Based on the experimental conductance for long-term potentiation(LTP) and long-term depression(LTD), the simulated network can achieve a high recognition rate up to 90%after only three training epochs. Such few training times can reduce the energy consumption in the supervised learning processes substantially. Therefore, this work paves an effective way for developing single-nanowire-based synapses in the fields of artificial intelligence systems and neuromorphic computing technology requiring lowpower consumption.

关键词： power artificial computing

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Engineering Smart HIV-1 Integrase Aptamers with Thioflavin T-Binding Capacity for Constructing Multiple Label-Free biosensors

SSRN

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SSRN 2024年

作者： Cao, Yanwei Li, Wenjing Pei, Renjun CAS Key Laboratory of Nano-Bio Interface Division of Nanobiomedicine Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou215123 China

Thioflavin T (ThT) has been used as a sensitive fluorescence probe for lighting up nucleic acids. The binding of ThT is dependent on the structural topologies of DNA sequences. To date, most oligonucleotides interact with ThT through only a single topology, and this limits the applications of ThT as a sensing agent. Here, we modulated an HIV-1 integrase aptamer, 93del, to have switchable topologies by optimizing its 3′ flanking residues to enhance its ThT-binding capacity. Our data revealed that the sequences formed stem-loop hairpins and I-motif/G-quadruplex (G4) hybrids in Na+ buffer under alkaline and acidic conditions, respectively. Both topologies could bind ThT with high affinity (Kd ~0.5 μM) and dramatically enhance the fluorescent signal of ThT. However, in the presence of K+, the sequences could be assembled into interlocked G4s, which had a low affinity for ThT but a high affinity for N-methyl mesoporphyrin IX (NMM). This allowed us to build highly sensitive fluorescent K+ sensors that were insusceptible to interference from Na+. Additionally, we found that the stacking of homologous base pairs in the hairpin loops was essential for ThT recognition and could be used as an indicator in the construction of label-free molecular beacons, allowing monitoring of microRNAs effectively in human serum spiked test. By employing external stimuli to induce the transformation of these topologies, we were able to sensitively detect ATP molecules in vitro and Hg2+ in lake water under specific acidic conditions. Our study provides a strategy for exploiting undiscovered functions of existing aptamers. © 2024, The Authors. All rights reserved.

关键词： Topology

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