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  1. Article ; Online: Thermopressure Coupling Effect Mimicking Natural Graphite Formation to Enhance the Storage K-Ion Performance of Carbonaceous Heterostructures.

    Ji, Tianyi / Liu, Xiaoxu / Wang, Hui / Shi, Yunli / Li, Yang / Zhang, Man / Li, Junqi / Liu, Hui / Shen, Ze Xiang

    Research (Washington, D.C.)

    2023  Volume 6, Page(s) 92

    Abstract: Borrowing from natural mechanisms for material design can lead to functional mimicry and improvement. Inspired by graphite formation, a thermopressure coupling strategy under micropressure (<400 Pa) is applied to prepare carbon anodes. A thermopressure ... ...

    Abstract Borrowing from natural mechanisms for material design can lead to functional mimicry and improvement. Inspired by graphite formation, a thermopressure coupling strategy under micropressure (<400 Pa) is applied to prepare carbon anodes. A thermopressure response is discovered based on the cellulose precursor. Here, homologous graphene quantum dot/hard carbon (GQD/HC) heterostructures are synthesized. Under 181.4 Pa and 1,200 °C, the product shows a capacity of 310 mAh g
    Language English
    Publishing date 2023-03-27
    Publishing country United States
    Document type Journal Article
    ISSN 2639-5274
    ISSN (online) 2639-5274
    DOI 10.34133/research.0092
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Symmetry Breaking and Spin-Orbit Coupling for Individual Vacancy-Induced In-Gap States in MoS

    Aliyar, Thasneem / Ma, Hongyang / Krishnan, Radha / Singh, Gagandeep / Chong, Bi Qi / Wang, Yitao / Verzhbitskiy, Ivan / Yu Wong, Calvin Pei / Johnson Goh, Kuan Eng / Shen, Ze Xiang / Koh, Teck Seng / Rahman, Rajib / Weber, Bent

    Nano letters

    2024  Volume 24, Issue 7, Page(s) 2142–2148

    Abstract: Spins confined to point defects in atomically thin semiconductors constitute well-defined atomic-scale quantum systems that are being explored as single-photon emitters and spin qubits. Here, we investigate the in-gap electronic structure of individual ... ...

    Abstract Spins confined to point defects in atomically thin semiconductors constitute well-defined atomic-scale quantum systems that are being explored as single-photon emitters and spin qubits. Here, we investigate the in-gap electronic structure of individual sulfur vacancies in molybdenum disulfide (MoS
    Language English
    Publishing date 2024-02-07
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c03681
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Near-Unity Emitting, Widely Tailorable, and Stable Exciton Concentrators Built from Doubly Gradient 2D Semiconductor Nanoplatelets.

    Liang, Xiao / Durmusoglu, Emek G / Lunina, Maria / Hernandez-Martinez, Pedro Ludwig / Valuckas, Vytautas / Yan, Fei / Lekina, Yulia / Sharma, Vijay Kumar / Yin, Tingting / Ha, Son Tung / Shen, Ze Xiang / Sun, Handong / Kuznetsov, Arseniy / Demir, Hilmi Volkan

    ACS nano

    2023  Volume 17, Issue 20, Page(s) 19981–19992

    Abstract: The strength of electrostatic interactions (EIs) between electrons and holes within semiconductor nanocrystals profoundly affects the performance of their optoelectronic systems, and different optoelectronic devices demand distinct EI strength of the ... ...

    Abstract The strength of electrostatic interactions (EIs) between electrons and holes within semiconductor nanocrystals profoundly affects the performance of their optoelectronic systems, and different optoelectronic devices demand distinct EI strength of the active medium. However, achieving a broad range and fine-tuning of the EI strength for specific optoelectronic applications is a daunting challenge, especially in quasi two-dimensional core-shell semiconductor nanoplatelets (NPLs), as the epitaxial growth of the inorganic shell along the direction of the thickness that solely contributes to the quantum confined effect significantly undermines the strength of the EI. Herein we propose and demonstrate a doubly gradient (DG) core-shell architecture of semiconductor NPLs for on-demand tailoring of the EI strength by controlling the localized exciton concentration via in-plane architectural modulation, demonstrated by a wide tuning of radiative recombination rate and exciton binding energy. Moreover, these exciton-concentration-engineered DG NPLs also exhibit a near-unity quantum yield, high photo- and thermal stability, and considerably suppressed self-absorption. As proof-of-concept demonstrations, highly efficient color converters and high-performance light-emitting diodes (external quantum efficiency: 16.9%, maximum luminance: 43,000 cd/m
    Language English
    Publishing date 2023-08-23
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.3c05125
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Pressure driven rotational isomerism in 2D hybrid perovskites.

    Yin, Tingting / Yan, Hejin / Abdelwahab, Ibrahim / Lekina, Yulia / Lü, Xujie / Yang, Wenge / Sun, Handong / Leng, Kai / Cai, Yongqing / Shen, Ze Xiang / Loh, Kian Ping

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 411

    Abstract: Multilayers consisting of alternating soft and hard layers offer enhanced toughness compared to all-hard structures. However, shear instability usually exists in physically sputtered multilayers because of deformation incompatibility among hard and soft ... ...

    Abstract Multilayers consisting of alternating soft and hard layers offer enhanced toughness compared to all-hard structures. However, shear instability usually exists in physically sputtered multilayers because of deformation incompatibility among hard and soft layers. Here, we demonstrate that 2D hybrid organic-inorganic perovskites (HOIP) provide an interesting platform to study the stress-strain behavior of hard and soft layers undulating with molecular scale periodicity. We investigate the phonon vibrations and photoluminescence properties of Ruddlesden-Popper perovskites (RPPs) under compression using a diamond anvil cell. The organic spacer due to C4 alkyl chain in RPP buffers compressive stress by tilting (n = 1 RPP) or step-wise rotational isomerism (n = 2 RPP) during compression, where n is the number of inorganic layers. By examining the pressure threshold of the elastic recovery regime across n = 1-4 RPPs, we obtained molecular insights into the relationship between structure and deformation resistance in hybrid organic-inorganic perovskites.
    Language English
    Publishing date 2023-01-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-36032-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: 2D Material Infrared Photonics and Plasmonics.

    Elbanna, Ahmed / Jiang, Hao / Fu, Qundong / Zhu, Juan-Feng / Liu, Yuanda / Zhao, Meng / Liu, Dongjue / Lai, Samuel / Chua, Xian Wei / Pan, Jisheng / Shen, Ze Xiang / Wu, Lin / Liu, Zheng / Qiu, Cheng-Wei / Teng, Jinghua

    ACS nano

    2023  Volume 17, Issue 5, Page(s) 4134–4179

    Abstract: Two-dimensional (2D) materials including graphene, transition metal dichalcogenides, black phosphorus, MXenes, and semimetals have attracted extensive and widespread interest over the past years for their many intriguing properties and phenomena, ... ...

    Abstract Two-dimensional (2D) materials including graphene, transition metal dichalcogenides, black phosphorus, MXenes, and semimetals have attracted extensive and widespread interest over the past years for their many intriguing properties and phenomena, underlying physics, and great potential for applications. The vast library of 2D materials and their heterostructures provides a diverse range of electrical, photonic, mechanical, and chemical properties with boundless opportunities for photonics and plasmonic devices. The infrared (IR) regime, with wavelengths across 0.78 μm to 1000 μm, has particular technological significance in industrial, military, commercial, and medical settings while facing challenges especially in the limit of materials. Here, we present a comprehensive review of the varied approaches taken to leverage the properties of the 2D materials for IR applications in photodetection and sensing, light emission and modulation, surface plasmon and phonon polaritons, non-linear optics, and Smith-Purcell radiation, among others. The strategies examined include the growth and processing of 2D materials, the use of various 2D materials like semiconductors, semimetals, Weyl-semimetals and 2D heterostructures or mixed-dimensional hybrid structures, and the engineering of light-matter interactions through nanophotonics, metasurfaces, and 2D polaritons. Finally, we give an outlook on the challenges in realizing high-performance and ambient-stable devices and the prospects for future research and large-scale commercial applications.
    Language English
    Publishing date 2023-02-23
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.2c10705
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Cobalt sulfide nanoflakes grown on graphite foam for Na-ion batteries with ultrahigh initial coulombic efficiency

    Wang, Haisheng / Liu, Jilei / Wang, Huanhuan / Cai, Xiaoyi / Ye, Xinli / Zhang, Lili / Chen, Zhen / Shen, Ze Xiang

    Journal of materials chemistry A. 2020 Aug. 4, v. 8, no. 30

    2020  

    Abstract: Sodium-ion batteries (SIBs) are regarded as promising low-cost alternatives to the prevailing lithium-ion batteries. However, most anode materials for SIBs suffer from low initial coulombic efficiency (ICE), limiting their commercial applications. Herein, ...

    Abstract Sodium-ion batteries (SIBs) are regarded as promising low-cost alternatives to the prevailing lithium-ion batteries. However, most anode materials for SIBs suffer from low initial coulombic efficiency (ICE), limiting their commercial applications. Herein, we demonstrate a Na-ion anode with an extremely high ICE of 99.4%, based on cobalt sulfide (Co₉S₈/CoS) nanoflakes grown on graphite foam (GF) in a diglyme-based electrolyte. The achievement of such a high ICE can be ascribed to the following three aspects: (i) negligible side reactions between a diglyme-based electrolyte and Co₉S₈/CoS, owing to a much higher Fermi level of diglyme reduction than anode potential μA of Co₉S₈/CoS, which can block electron transfer from the anode to the electrolyte, (ii) highly reversible conversion reaction of Co₉S₈/CoS, and (iii) much lower initial capacity loss of substrate GF, compared with other sorts of carbon. The underlying rules revealed in this study serve as general guidelines in the development of sodium-ion anodes to achieve superb ICE.
    Keywords anodes ; cobalt sulfide ; electrolytes ; electron transfer ; foams ; graphene ; guidelines ; lithium batteries
    Language English
    Dates of publication 2020-0804
    Size p. 14900-14907.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d0ta04312e
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Layered P3-Type K

    Zhang, Xinyuan / Yu, Dongxu / Wei, Zhixuan / Chen, Nan / Chen, Gang / Shen, Ze Xiang / Du, Fei

    ACS applied materials & interfaces

    2021  Volume 13, Issue 16, Page(s) 18897–18904

    Abstract: Layered transition metal oxides are ideal ... ...

    Abstract Layered transition metal oxides are ideal Na
    Language English
    Publishing date 2021-04-14
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.1c03233
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites.

    Fu, Jianhui / Li, Mingjie / Solanki, Ankur / Xu, Qiang / Lekina, Yulia / Ramesh, Sankaran / Shen, Ze Xiang / Sum, Tze Chien

    Advanced materials (Deerfield Beach, Fla.)

    2021  Volume 33, Issue 11, Page(s) e2006233

    Abstract: Excitonic effects underpin the fascinating optoelectronic properties of 2D perovskites that are highly favorable for photovoltaics and light-emitting devices. Analogous to switching in transistors, manipulating these excitonic properties in 2D ... ...

    Abstract Excitonic effects underpin the fascinating optoelectronic properties of 2D perovskites that are highly favorable for photovoltaics and light-emitting devices. Analogous to switching in transistors, manipulating these excitonic properties in 2D perovskites using coherent phonons could unlock new applications. Presently, a detailed understanding of this underlying mechanism remains modest. Herein, the origins of the carrier-phonon coupling in 2D perovskites using transient absorption (TA) spectroscopy are explicated. The exciton fine structure is modulated by coherent optical phonons dominated by the vibrational motion of the PbI
    Language English
    Publishing date 2021-02-11
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202006233
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Strong Optical, Electrical, and Raman in-Plane Anisotropy in Corrugated Two-Dimensional Perovskite

    Lekina, Yulia / Febriansyah, Benny / Fan, Xiaofeng / You, Lu / Morris, Samuel / Wang, Junling / England, Jason / Huang, Xiaoli / Yan, Jiaxu / Shen, Ze Xiang

    Journal of physical chemistry. 2021 Oct. 12, v. 125, no. 41

    2021  

    Abstract: Combining the unique properties of hybrid halide perovskites and in-plane anisotropic potential of two-dimensional materials, corrugated layered perovskites are excellent candidates for novel optoelectronic devices. Here, we report strong in-plane ... ...

    Abstract Combining the unique properties of hybrid halide perovskites and in-plane anisotropic potential of two-dimensional materials, corrugated layered perovskites are excellent candidates for novel optoelectronic devices. Here, we report strong in-plane anisotropy in a two-dimensional hybrid halide perovskite with corrugated inorganic sheets. We assigned the angle-dependent Raman spectra to particular orientations of the crystals where the method applied is suitable for fast determination of the in-plane crystallographic axes. We demonstrated strong in-plane anisotropy of the optoelectronic properties: electrical measurements showed that changes of photoconductivity and angle-resolved reflectance spectroscopy exhibited variation of the band structure. Employing first-principles calculations, we confirmed the observed anisotropy of the dielectric response. Photoluminescence spectroscopy revealed an anomalous energy shift of ∼20 meV dependent on the relative orientation of the crystals and polarization of the excitation light. Using temperature-dependent analysis of the photoluminescence spectra, we obtained the anisotropic exciton–phonon coupling strength as well as the angle-dependent average phonon energy involved, which contributes to the shift of the photoluminescence peak maximum. This discovery of the in-plane anisotropic behavior in layered 2D perovskites could be expected to spur new functionalities in optical and optoelectronic device applications.
    Keywords anisotropy ; electronic equipment ; energy ; photoluminescence ; physical chemistry ; reflectance spectroscopy
    Language English
    Dates of publication 2021-1012
    Size p. 22630-22642.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.1c06261
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Inorganic frameworks of low-dimensional perovskites dictate the performance and stability of mixed-dimensional perovskite solar cells.

    Febriansyah, Benny / Li, Yongxin / Giovanni, David / Salim, Teddy / Hooper, Thomas J N / Sim, Ying / Ma, Daphne / Laxmi, Shoba / Lekina, Yulia / Koh, Teck Ming / Shen, Ze Xiang / Pullarkat, Sumod A / Sum, Tze Chien / Mhaisalkar, Subodh G / Ager, Joel W / Mathews, Nripan

    Materials horizons

    2023  Volume 10, Issue 2, Page(s) 536–546

    Abstract: Mixed-dimensional perovskites containing mixtures of organic cations hold great promise to deliver highly stable and efficient solar cells. However, although a plethora of relatively bulky organic cations have been reported for such purposes, a ... ...

    Abstract Mixed-dimensional perovskites containing mixtures of organic cations hold great promise to deliver highly stable and efficient solar cells. However, although a plethora of relatively bulky organic cations have been reported for such purposes, a fundamental understanding of the materials' structure, composition, and phase, along with their correlated effects on the corresponding optoelectronic properties and degradation mechanism remains elusive. Herein, we systematically engineer the structures of bulky organic cations to template low-dimensional perovskites with contrasting inorganic framework dimensionality, connectivity, and coordination deformation. By combining X-ray single-crystal structural analysis with depth-profiling XPS, solid-state NMR, and femtosecond transient absorption, it is revealed that not all low-dimensional species work equally well as dopants. Instead, it was found that inorganic architectures with lesser structural distortion tend to yield less disordered energetic and defect landscapes in the resulting mixed-dimensional perovskites, augmented in materials with a longer photoluminescence (PL) lifetime, higher PL quantum yield (up to 11%), improved solar cell performance and enhanced thermal stability (
    Language English
    Publishing date 2023-02-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 2744250-0
    ISSN 2051-6355 ; 2051-6347
    ISSN (online) 2051-6355
    ISSN 2051-6347
    DOI 10.1039/d2mh00868h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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