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  1. Article ; Online: Confinement-Tunable Transition Dipole Moment Orientation in Perovskite Nanoplatelet Solids and Binary Blends.

    Marcato, Tommaso / Krumeich, Frank / Shih, Chih-Jen

    ACS nano

    2022  Volume 16, Issue 11, Page(s) 18459–18471

    Abstract: Tuning the transition dipole moment (TDM) orientation in low-dimensional semiconductors is of fundamental and practical interest, as it enables high-efficiency nanophotonics and light-emitting diodes. However, despite recent progress in nanomaterials ... ...

    Abstract Tuning the transition dipole moment (TDM) orientation in low-dimensional semiconductors is of fundamental and practical interest, as it enables high-efficiency nanophotonics and light-emitting diodes. However, despite recent progress in nanomaterials physics and chemistry, material systems that allow continuous tuning of the TDM orientation remain rare. Here, combining
    Language English
    Publishing date 2022-11-09
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.2c06600
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Engineering Two-dimensional Materials Surface Chemistry.

    Shih, Chih-Jen

    Chimia

    2016  Volume 70, Issue 11, Page(s) 800–804

    Abstract: This account reviews our recent research activities and achievements in the field of two-dimensional (2D) materials surface chemistry. 2D materials are atomically thin, so that carriers are less-restricted to move in the in-plane direction, whereas the ... ...

    Abstract This account reviews our recent research activities and achievements in the field of two-dimensional (2D) materials surface chemistry. 2D materials are atomically thin, so that carriers are less-restricted to move in the in-plane direction, whereas the out-of-plain motion is quantum-confined. Semiconductor quantum wells and graphene are two well-known examples. Applications of 2D materials in optoelectronics, surface modification, and complex materials must overcome engineering challenges associated with understanding and engineering surface chemistry of 2D materials, which essentially bridge multiscale physical phenomena. In my research group, we understand and engineer broad aspects of chemistry and physics at nanomaterials surfaces for advancing nanomaterials-based technologies. The three main topics covered in this account are as follows: i) colloidal synthesis of stacking-controlled 2D materials, ii) wetting properties of 2D materials, and iii) engineering electronic transport at 2D materials-semiconductor interfaces.
    Language English
    Publishing date 2016-11-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1516-7
    ISSN 0009-4293
    ISSN 0009-4293
    DOI 10.2533/chimia.2016.800
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4.5: Show issues

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  3. Article ; Online: Rapid Electrochemical Flow Analysis of Urinary Creatinine on Paper: Unleashing the Potential of Two-Electrode Detection.

    Bezinge, Léonard / Tappauf, Niklas / Richards, Daniel A / Shih, Chih-Jen / deMello, Andrew J

    ACS sensors

    2023  Volume 8, Issue 10, Page(s) 3964–3972

    Abstract: The development of low-cost, disposable electrochemical sensors is an essential step in moving traditionally inaccessible quantitative diagnostic assays toward the point of need. However, a major remaining limitation of current technologies is the ... ...

    Abstract The development of low-cost, disposable electrochemical sensors is an essential step in moving traditionally inaccessible quantitative diagnostic assays toward the point of need. However, a major remaining limitation of current technologies is the reliance on standardized reference electrode materials. Integrating these reference electrodes considerably restricts the choice of the electrode substrate and drastically increases the fabrication costs. Herein, we demonstrate that adoption of two-electrode detection systems can circumvent these limitations and allow for the development of low-cost, paper-based devices. We showcase the power of this approach by developing a continuous flow assay for urinary creatinine enabled by an embedded graphenic two-electrode detector. The detection system not only simplifies sensor fabrication and readout hardware but also provides a robust sensing performance with high detection efficiencies. In addition to enabling high-throughput analysis of clinical urine samples, our two-electrode sensors provide unprecedented insights into the fundamental mechanism of the ferricyanide-mediated creatinine reaction. Finally, we developed a simplified circuitry to drive the detector. This forms the basis of a smart reader that guides the user through the measurement process. This study showcases the potential of affordable capillary-driven cartridges for clinical analysis within primary care settings.
    MeSH term(s) Creatinine ; Electrochemical Techniques ; Electrodes ; Urinalysis
    Chemical Substances Creatinine (AYI8EX34EU)
    Language English
    Publishing date 2023-09-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2379-3694
    ISSN (online) 2379-3694
    DOI 10.1021/acssensors.3c01640
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Uniform, Strain-Free, Large-Scale Graphene and h-BN Monolayers Enabled by Hydrogel Substrates.

    Belyaeva, Liubov / Ludwig, Cyril / Lai, Yu-Cheng / Chou, Chia-Ching / Shih, Chih-Jen

    Small (Weinheim an der Bergstrasse, Germany)

    2023  Volume 20, Issue 9, Page(s) e2307054

    Abstract: Translation of the unique properties of 2D monolayers from non-scalable micron-sized samples to macroscopic scale is a longstanding challenge obstructed by the substrate-induced strains, interface nonuniformities, and sample-to-sample variations inherent ...

    Abstract Translation of the unique properties of 2D monolayers from non-scalable micron-sized samples to macroscopic scale is a longstanding challenge obstructed by the substrate-induced strains, interface nonuniformities, and sample-to-sample variations inherent to the scalable fabrication methods. So far, the most successful strategies to reduce strain in graphene are the reduction of the interface roughness and lattice mismatch by using hexagonal boron nitride (h-BN), with the drawback of limited uniformity and applicability to other 2D monolayers, and liquid water, which is not compatible with electronic devices. This work demonstrates a new class of substrates based on hydrogels that overcome these limitations and excel h-BN and water substrates at strain relaxation enabling superiorly uniform and reproducible centimeter-sized sheets of unstrained monolayers. The ultimate strain relaxation and uniformity are rationalized by the extreme structural adaptability of the hydrogel surface owing to its high liquid content and low Young's modulus, and are universal to all 2D materials irrespective of their crystalline structure. Such platforms can be integrated into field effect transistors and demonstrate enhanced charge carrier mobilities in graphene. These results present a universal strategy for attaining uniform and strain-free sheets of 2D materials and underline the opportunities enabled by interfacing them with soft matter.
    Language English
    Publishing date 2023-10-22
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202307054
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  5. Article ; Online: Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes.

    Kumar, Sudhir / Marcato, Tommaso / Krumeich, Frank / Li, Yen-Ting / Chiu, Yu-Cheng / Shih, Chih-Jen

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 2106

    Abstract: Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than the organic counterpart, because it is ... ...

    Abstract Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than the organic counterpart, because it is not yet possible to control the transition-dipole-moment (TDM) orientation in QD solids at device level. Here, using the colloidal lead halide perovskite anisotropic nanocrystals (ANCs) as a model system, we report a directed self-assembly approach to form the anisotropic nanocrystal superlattices (ANSLs). Emission polarization in individual ANCs rescales the radiation from horizontal and vertical transition dipoles, effectively resulting in preferentially horizontal TDM orientation. Based on the emissive thin films comprised of ANSLs, we demonstrate an enhanced ratio of horizontal dipole up to 0.75, enhancing the theoretical light outcoupling efficiency of greater than 30%. Our optimized single-junction QD LEDs showed peak external quantum efficiency of up to 24.96%, comparable to state-of-the-art organic LEDs.
    Language English
    Publishing date 2022-04-19
    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/s41467-022-29812-5
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  6. Article ; Online: Performance Evaluation for Clinical Stroke Rehabilitation via an Automatic Mobile Gait Trainer.

    Shih, Chih-Jen / Li, You-Chi / Yuan, Wei / Chen, Szu-Fu / Lin, Ang-Chieh / Lin, Tzu-Tung / Wang, Fu-Cheng

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 15

    Abstract: This paper investigates the clinical efficacy of an automatic mobile trainer for gait training in stroke patients. Neuro-Developmental Treatment (NDT) is a rehabilitation method for stroke patients that enhances motor learning through repeated practice. ... ...

    Abstract This paper investigates the clinical efficacy of an automatic mobile trainer for gait training in stroke patients. Neuro-Developmental Treatment (NDT) is a rehabilitation method for stroke patients that enhances motor learning through repeated practice. Despite the proven effectiveness of therapist-assisted NDT, it is labor-intensive and demands health resources. Therefore, we developed automatic trainers based on NDT principles to perform gait training. This paper modifies the mobile trainer's intervention patterns to improve the subject's longitudinal gait symmetry, lateral pelvic displacement symmetry, and pelvic rotation. We first invited ten healthy subjects to test the modified trainer and then recruited 26 stroke patients to undergo the same gait training. Longitudinal symmetry, lateral symmetry, and pelvic rotation were assessed before, during, and after the intervention. Most subjects show improvements in longitudinal symmetry, lateral symmetry, and pelvic rotation after using the trainer. These results confirm the trainer's effectiveness of the modified intervention schemes in helping clinical gait rehabilitation for stroke patients.
    MeSH term(s) Humans ; Stroke Rehabilitation ; Gait ; Stroke ; Exercise Therapy/methods ; Treatment Outcome ; Gait Disorders, Neurologic/rehabilitation
    Language English
    Publishing date 2023-07-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23156793
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  7. Article ; Online: Correction: Real-time, smartphone-based processing of lateral flow assays for early failure detection and rapid testing workflows.

    Colombo, Monika / Bezinge, Léonard / Rocha Tapia, Andres / Shih, Chih-Jen / deMello, Andrew J / Richards, Daniel A

    Sensors & diagnostics

    2023  Volume 3, Issue 1, Page(s) 153

    Abstract: This corrects the article DOI: 10.1039/D2SD00197G.]. ...

    Abstract [This corrects the article DOI: 10.1039/D2SD00197G.].
    Language English
    Publishing date 2023-11-07
    Publishing country England
    Document type Published Erratum
    ISSN 2635-0998
    ISSN (online) 2635-0998
    DOI 10.1039/d3sd90022c
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  8. Article ; Online: Paper-Based Laser-Pyrolyzed Electrofluidics: An Electrochemical Platform for Capillary-Driven Diagnostic Bioassays.

    Bezinge, Léonard / Lesinski, Jake M / Suea-Ngam, Akkapol / Richards, Daniel A / deMello, Andrew J / Shih, Chih-Jen

    Advanced materials (Deerfield Beach, Fla.)

    2023  Volume 35, Issue 30, Page(s) e2302893

    Abstract: Microfluidic paper-based analytical devices (µPADs) are indispensable tools for disease diagnostics. The integration of electronic components into µPADs enables new device functionalities and facilitates the development of complex quantitative assays. ... ...

    Abstract Microfluidic paper-based analytical devices (µPADs) are indispensable tools for disease diagnostics. The integration of electronic components into µPADs enables new device functionalities and facilitates the development of complex quantitative assays. Unfortunately, current electrode fabrication methods often hinder capillary flow, considerably restricting µPAD design architectures. Here, laser-induced graphenization is presented as an approach to fabricate porous electrodes embedded into cellulose paper. The resulting electrodes not only have high conductivity and electrochemical activity, but also retain wetting properties for capillary transport. Paper-based electrofluidics, including a lateral flow device for injection analysis of alkaline phosphatase in serum and a vertical flow device for quantitative detection of HPV16 with a CRISPR-based assay are demonstrated. It is expected that this platform will streamline the development of diagnostic devices that combine the operational simplicity of colorimetric lateral flow tests with the added benefits and possibilities offered by electronic signaling.
    MeSH term(s) Paper ; Cellulose ; Lab-On-A-Chip Devices ; Electrodes ; Microfluidic Analytical Techniques
    Chemical Substances Cellulose (9004-34-6)
    Language English
    Publishing date 2023-06-12
    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.202302893
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  9. Article: Ligand-assisted solid phase synthesis of mixed-halide perovskite nanocrystals for color-pure and efficient electroluminescence.

    Solari, Simon F / Kumar, Sudhir / Jagielski, Jakub / Kubo, Nikolas M / Krumeich, Frank / Shih, Chih-Jen

    Journal of materials chemistry. C

    2021  Volume 9, Issue 17, Page(s) 5771–5778

    Abstract: Colloidal nanocrystals (NCs) of lead halide perovskites have generated considerable interest in the fabrication of optoelectronic devices, such as light emitting-diodes (LEDs), because of their tunable optical bandgap, narrow spectral width, and high ... ...

    Abstract Colloidal nanocrystals (NCs) of lead halide perovskites have generated considerable interest in the fabrication of optoelectronic devices, such as light emitting-diodes (LEDs), because of their tunable optical bandgap, narrow spectral width, and high defect tolerance. However, the inhomogeneous halide distribution within individual NCs remains a critical challenge in order to obtain color-stable electroluminescence in mixed-halide systems. Here, we demonstrate a new post-synthetic approach, ligand-assisted solid phase synthesis (LASPS), for the preparation of electroluminescent colloidal NCs of methylammonium (MA) lead halide perovskites, at room temperature. The slow reaction kinetics preserves the morphology, size, and shape in the resulting NCs whose emission covers the entire visible spectral region with photoluminescence (PL) quantum yields (QYs) of up to >90% and colloidal stability up to several months. The LEDs fabricated using the prepared mixed-halide NCs display narrowband electroluminescence (EL) ranging from 476 to 720 nm. The optimized red LEDs exhibit an external quantum efficiency,
    Language English
    Publishing date 2021-03-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 2702245-6
    ISSN 2050-7534 ; 2050-7526
    ISSN (online) 2050-7534
    ISSN 2050-7526
    DOI 10.1039/d0tc04667a
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  10. Article: Superior gait performance and balance ability in Latin dancers.

    Liu, Yen-Ting / Lin, Ang-Chieh / Chen, Szu-Fu / Shih, Chih-Jen / Kuo, Tien-Yun / Wang, Fu-Cheng / Lee, Pei-Hsin / Lee, Adeline Peiling

    Frontiers in medicine

    2022  Volume 9, Page(s) 834497

    Abstract: Background: Latin dance consists of various fast and stability-challenging movements that require constant body adjustments to maintain proper posture and balance. Although human gaits are assumed to be symmetrical, several factors can contribute to ... ...

    Abstract Background: Latin dance consists of various fast and stability-challenging movements that require constant body adjustments to maintain proper posture and balance. Although human gaits are assumed to be symmetrical, several factors can contribute to asymmetrical behavior of the lower extremities in healthy adults. These include lower limb dominance, ground reaction forces, lower limb muscle power, foot placement angle, and range of joint motion. Gait impairment can lead to a high risk of falling, diminished mobility, and even cognition impairment. We hypothesized that Latin dancers might have a more symmetric gait pattern and better balance ability than healthy non-dancer controls.
    Methods: We investigated the impact of Latin dance training on gait behaviors and body balance. We recruited twenty Latin dancers and 22 normal healthy subjects to conduct walking experiments and one-leg stance tests, and we measured their kinematic data by inertial measurement units. We then defined four performance indexes to assess gait performance and body stability to quantify the potential advantages of dance training.
    Results: We found that the two gait asymmetric indexes during the walking test and the two performance indexes during the one-leg stance tests were better in Latin dancers compared with the healthy control group. The results confirmed the superiority of Latin dancers over the healthy control group in gait symmetry and balance stability. Our results suggest that Latin dancing training could effectively strengthen lower limb muscles and core muscle groups, thereby improving coordination and enhancing gait performance and balance.
    Conclusion: Latin dance training can benefit gait performance and body balance. Further studies are needed to investigate the effect of Latin dance training on gait and balance outcomes in healthy subjects and patients with gait disorders.
    Language English
    Publishing date 2022-08-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2775999-4
    ISSN 2296-858X
    ISSN 2296-858X
    DOI 10.3389/fmed.2022.834497
    Database MEDical Literature Analysis and Retrieval System OnLINE

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