Yi Qin

University of Oxford

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Jianfeng Zhu

Shaanxi University of Science and Technology

Ting Zhao

Shaanxi University of Science and Technology

Suman Mallick

Sharda University

Miao Meng

Jinan University

Chun Y. Liu

Jinan University

Jianfeng Yang

Xi'an Jiaotong University

Lijiu Cao

Guangzhou Chemistry (China)

Hai‐Bo Yang

East China Normal University

Lin Xu

East China Normal University

Baocai Li

State Forestry and Grassland Administration

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Chinese Academy of Sciences

154

Shaanxi University of Science and Technology

Huazhong University of Science and Technology

University of Chinese Academy of Sciences

Soochow University

Sichuan University

Shenzhen University

University of Science and Technology of China

East China Normal University

Tsinghua University

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Development of a transverse thermoelectric voltage effect in artificial SrTiO₃/SrTi_1−xNb_xO₃ epitaxial multilayer films with incline-oriented sublayers

CrystEngComm (2014)

Yi Qin Ting Zhao Bo Wang Pengxiang Zhang Jianfeng Yang

The TTE voltage effect was greatly improved by constructing the artificial multilayer structure of STO/NSTO with accurate inclined orientation.

10.1039/c4ce00170b

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Citations (7)

One Stone, Three Birds: Feasible Tuning of Barrier Heights Induced by Hybridized Interface in Free-Standing PEDOT@Bi2Te3 Thermoelectric Films

Polymers (2024)

Feng Li Fen Wang Hongjie Luo Yajuan Zhang Jianfeng Zhu

Converting low-grade thermal energy into electrical energy is crucial for the development of modern smart wearable energy technologies. The free-standing films of PEDOT@Bi2Te3 prepared by tape-casting hold promise for flexible thermoelectric technology in self-powered sensing applications. Bi2Te3 nanosheets fabricated by the solvothermal method are tightly connected with flat-arranged PEODT molecules, forming an S-Bi bonded interface in the composite materials, and the bandgap is reduced to 1.63 eV. Compared with the PEDOT film, the mobility and carrier concentration of the composite are significantly increased at room temperature, and the conductivity reaches 684 S/cm. Meanwhile, the carrier concentration decreased sharply at 360 K indicating the creation of defect energy levels during the interfacial reaction of the composites, which increased the Seebeck coefficient. The power factor was improved by 68.9% compared to PEDOT. In addition, the introduction of Bi2Te3 nanosheets generated defects and multidimensional interfaces in the composite film, which resulted in weak phonon scattering in the conducting polymer with interfacial scattering. The thermal conductivity of the film is decreased and the ZT value reaches 0.1. The composite film undergoes 1500 bending cycles with a 14% decrease in conductivity and has good flexibility. This self-supporting flexible thermoelectric composite film has provided a research basis for low-grade thermal energy applications.

Carrier scattering

Phonon scattering

10.3390/polym16141979

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Temperature-triggered fire warning PEG@wood powder/carbon nanotube/calcium alginate composite aerogel and the application for firefighting clothing

Composites Part B Engineering (2022)

Yushu Wang Jinru Liu Yuhang Zhao Yi Qin Zhenyu Zhu

10.1016/j.compositesb.2022.110348

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Energy levels and transition data of 3p⁶3d⁸ and 3p⁵3d⁹ configurations in Fe-like ions (Z = 57,60,62,64,65)

Chinese Physics B (2021)

Bao-Ling Shi Yi Qin Xiangfu Li Banglin Deng Gang Jiang

Atomic data of highly charged ions (HCIs) offer an attractive means for plasma diagnostic and stars identification, and the investigations on atomic data are highly desirable. Herein, based on the fully relativistic multi-configuration Dirac–Hartree–Fock (MCDHF) method, we have performed calculations of the fine-structure energy levels, wavelengths, transition rates, oscillator strengths, and line strengths for the lowest 21 states of 3p 6 3d 8 –3p 5 3d 9 electric dipole (E1) transitions configurations in Fe-like ions ( Z = 57, 60, 62, 64, 65). The correlation effects of valence–valence (VV) and core–valence (CV) electrons were systematically considered. In addition, we have taken into account transverse-photon (Breit) interaction and quantum electrodynamics (QED) corrections to treat accurately the atomic state wave functions in the final relativistic configuration interaction (RCI) calculations. Our calculated energy levels and transition wavelengths are in excellent agreement with the available experimental and theoretical results. Most importantly, we predicted some new transition parameters that have not yet been reported. These data would further provide critical insights into better analyzing the physical processes of various astrophysical plasmas.

Valence electron

10.1088/1674-1056/ac4480

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Modular Construction of AIE-Active Supramolecular Cages with Tunable Fluorescence for NIR-II Blood Vessel Imaging

ACS Materials Letters (2023)

Yi Qin Xue Li Shuai Lu Miaomiao Kang Zhijun Zhang

Fluorescent supramolecular cages have attracted significant scientific interest owing to their widespread applications in molecular sensing, luminescent materials, and biological systems. However, the modular construction of such assemblies with tunable emission behaviors affording high-performance bioimaging applications is still challenging. Herein, we developed a general and straightforward protocol to formulate supramolecular cages with an aggregation-induced emission (AIE) tendency by using "donor–acceptor–donor (D–A–D)" adducts as building blocks. A series of box-shaped cages MA–MG with adjustable fluorescence from red to the second near-infrared (NIR-II) region were successfully prepared. In particular, the emission maximum of MG was located at 981 nm, behaving like the rare NIR-II emissive supramolecular cages thus far, and the cage-loaded nanoparticles MGNPs featured a high absolute quantum yield in the NIR-II region, which enabled them to perform well in blood vessel imaging.

Quantum yield

Triphenylamine

10.1021/acsmaterialslett.3c00542

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DT-GC: Adaptive Garbage Collection with Dynamic Thresholds for SSDs

Yi Qin Dan Feng Jingning Liu Wei Tong Zhiming Zhu

Solid state drives (SSDs) are rapidly growing used in both personal computer and enterprise server area in the past several years. Compare with traditional hard disk drive, the advantages of SSDs are great performance, small size and shock resistance. However, SSDs suffer from obvious performance dropping when free physical pages become lacking, after plenty of data writing. Because time-consuming garbage collection has to be ran to gaining enough free pages. Most algorithms determine a certain threshold of free page proportion, which could not adapt to various application environments, to trigger the garbage collection process. To achieve efficient garbage collection in most application environments, we propose DT-GC, an adaptive garbage collection method with dynamic thresholds. In such scheme, garbage collection request with different priority could be triggered intelligently by dynamic thresholds, which are determined by the running state of SSDs.

10.1109/ccbd.2014.28

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Filtering low‐energy carriers to enhance thermoelectric performance of Cd‐doped SnSe via incorporation of MXene sheets

International Journal of Applied Ceramic Technology (2023)

Yi Qin Mengxue Wang Xiaohan Li Yajuan Zhang Shenglai Tang

Abstract SnSe‐based materials have attracted widespread attention in thermoelectrics due to their outstanding thermoelectric performance. However, the pristine and unmodified polycrystalline SnSe reveals poor electrical properties. Doping and constructing nanostructured composite architectures to produce energy filtering effect proved to be an effective method to strengthen thermoelectric performance. In this study, Ti 3 C 2 /Sn 0.98 Cd 0.02 Se composites are successfully fabricated by the solvothermal method combined with the electrostatic self‐assembly method and spark plasma sintering. The phase interface introduced by incorporating Ti 3 C 2 into Sn 0.98 Cd 0.02 Se can effectively filter low‐energy carriers due to its generation of energy barriers, thereby the Seebeck coefficient of x wt% Ti 3 C 2 /Sn 0.98 Cd 0.02 Se x = (0.05, 0.5, 1) samples is better than that of the pristine Sn 0.98 Cd 0.02 Se over the whole temperature range. Meanwhile, high conductivity was also obtained in 1 wt% Ti 3 C 2 /Sn 0.98 Cd 0.02 Se sample so that the high power factor of 3.31 μWcm −1 K − 2 was acquired at 773 K. Ultimately, a peak ZT value of 0.41 was obtained at 773 K, compared with pristine Sn 0.98 Cd 0.02 Se, and the thermoelectric performance improved by 24%. This study offers an available approach to efficiently enhance the thermoelectric properties of polycrystalline SnSe‐based materials.

Spark Plasma Sintering

10.1111/ijac.14585

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Inside Cover: Construction of Highly Emissive Pt(II) Metallacycles upon Irradiation (Chin. J. Chem. 4/2019)

Chinese Journal of Chemistry (2019)

Yi Qin Ying Zhang Guang‐Qiang Yin Yuxuan Wang Changwei Zhang

The inside cover picture shows in situ construction of highly emissive Pt(II) metallacycles upon irradiation. The self‐assembled diarylethene‐containing metallacycles can realize supramolecular transform from the open‐ring isomers to their closed‐ring ones under UV irradiation. Moreover, the closed‐ring isomers featured a relatively high fluorescence quantum yield. This property of “turn‐on” fluorescence switching provides a new method to construct highly emissive supramolecular fluorescent materials by light stimulus. More details are discussed in the article by Yang et al. on page 323–329. image

Diarylethene

Quantum yield

10.1002/cjoc.201990042

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Design of low cost broadband class-E power amplifier using low voltage supply

High Frequency Postgraduate Student Colloquium (2004)

Yi Qin Shengjie Gao A. Sambell

The design of a broadband high efficiency class-E power amplifier for use in wireless communication systems is presented. A low cost PHEMT device is employed to enhance both efficiency and bandwidth performance. The design has been investigated theoretically and experimentally and simulated using the harmonic balance method in an advance design system (ADS). A peak PAE of 72.1% is achieved at 1.95 GHz with transducer power gain of 10.8 dB in the improved design, together with a resulting bandwidth of 35% (1.52 GHz to 2.16 GHz). Simulation and practical results confirm the validity of these approaches.

Power bandwidth

10.1109/hfpsc.2004.1360363

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Coordination-driven self-assembly of a Pt(iv) prodrug-conjugated supramolecular hexagon

Chemical Communications (2017)

Zhizhou Yue Han Wang Yiming Li Yi Qin Lin Xu

This article presents a new strategy to engage coordination-driven self-assembly for platinum drug delivery. The self-assembled supramolecular hexagon is conjugated with three equivalents of Pt(iv) prodrugs and displays a superior therapeutic index compared to cisplatin against a panel of human cancer cell lines.

10.1039/c7cc07622c

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Citations (45)