bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hydrogen Peroxide Electrosynthesis via Selective Oxygen Reduction Reactions Through Interfacial Reaction Microenvironment Engineering
Authors: Tian Qiang , Jing Lingyan , Wang Wenyi , Ye Xieshu , Chai Xiaoyan , Zhang Xue , Hu Qi , Yang Hengpan , He Chuanxin 
Published: November 2024

AbstractThe electrochemical two‐electron oxygen reduction reaction (2e− ORR) offers a compelling alternative for decentralized and on‐site H2O2 production compared to the conventional anthraquinone process. To advance this electrosynthesis system, there is growing interest in optimizing the interfacial reaction microenvironment to boost electrocatalytic performance. This review consolidates recent advancements in reaction microenvironment engineering for the selective electrocatalytic conversion of O2 to H2O2. Starting with fundamental insights into interfacial electrocatalytic mechanisms, an overview of various strategies for constructing the favorable local reaction environment, including adjusting electrode wettability, enhancing mesoscale mass transfer, elevating local pH, incorporating electrolyte additives, and employing pulsed electrocatalysis techniques is provided. Alongside these regulation strategies, the corresponding analyses and technical remarks are also presented. Finally, a summary and outlook on critical challenges, suggesting future research directions to inspire microenvironment engineering and accelerate the practical application of H2O2 electrosynthesis is delivered.
Soft Sputtering of Large‐Area 2D MoS2 Layers Using Isolated Plasma Soft Deposition for Humidity Sensors
Authors: Youn Hye‐Young , Choi Tae‐Yang , Shim Junoh , Park Se Young , Kwon Min‐Ki , Kim Sunkook , Kim Han‐Ki 
Published: November 2024

Abstract2D transition‐metal dichalcogenides are emerging as key materials for next‐generation semiconductor technologies owing to their tunable bandgaps, high carrier mobilities, and exceptional surface‐to‐volume ratios. Among them, molybdenum disulfide (MoS2) has garnered significant attention. However, scalable wafer‐level deposition methods that enable uniform layer‐controlled synthesis remain a critical challenge. In this paper, a novel fabrication approach—isolated plasma soft deposition (IPSD) followed by sulfurization—for the scalable production of 2D MoS2 with precise layer control is introduced. The IPSD system employs a scanning‐based deposition method combined with plasma surface pretreatment, achieving large‐area, high‐quality 2D MoS2 layers. Comprehensive characterizations using Raman, UV–vis, and photoluminescence spectroscopy, and transmission electron microscopy confirmed the successful synthesis of crystalline mono‐ to tetralayer 2D MoS2 on 6‐inch SiO2/Si substrates. Furthermore, respiration sensors fabricated using the IPSD‐grown 2D MoS2 layers demonstrated fast response times (≈1 s) and high response to relative humidity levels between 30% and 60%. This study offers significant advancements in the scalable synthesis of 2D MoS2 and opens new avenues for its application in advanced sensing and electronic devices.
Investigating Impacts of Local Pressure and Temperature on CVD Growth of Hexagonal Boron Nitride on Ge(001)/Si
Authors: Franck Max , Dabrowski Jarek , Schubert Markus Andreas , Vignaud Dominique , Achehboune Mohamed , Colomer Jean‐François , Henrard Luc , Wenger Christian , Lukosius Mindaugas 
Published: November 2024

AbstractThe chemical vapor deposition (CVD) growth of hexagonal boron nitride (hBN) on Ge substrates is a promising pathway to high‐quality hBN thin films without metal contaminations for microelectronic applications, but the effect of CVD process parameters on the hBN properties is not well understood yet. The influence of local changes in pressure and temperature due to different reactor configurations on the structure and quality of hBN films grown on Ge(001)/Si is studied. Injection of the borazine precursor close to the sample surface results in an inhomogeneous film thickness, attributed to an inhomogeneous pressure distribution at the surface, as shown by computational fluid dynamics simulations. The additional formation of nanocrystalline islands is attributed to unfavorable gas phase reactions due to the radiative heating of the injector. Both issues are mitigated by increasing the injector‐sample distance, leading to an 86% reduction in pressure variability on the sample surface and a 200 °C reduction in precursor temperature. The resulting hBN films exhibit no nanocrystalline islands, improved thickness homogeneity, and high crystalline quality (Raman FWHM = 23 cm−1). This is competitive with hBN films grown on other non‐metal substrates but achieved at lower temperature and with a low thickness of only a few nanometers.
Pressure‐Induced Unusual Transition of Luminescence Mechanics from Self‐Trapped Exciton to Free Exciton Emission in Lead Bromide Perovskitoids
Authors: Rong Yan , Wang Lingrui , Wang Yongheng , Wang Wenxin , Wang Jiaxiang , Yuan Yifang , Shahzadi Urooj , Chen Junnian , Zhang Lei , Wang Kai , Guo Haizhong 
Published: November 2024

AbstractUnderstanding the luminescence mechanics of metal halide perovskites is the key to uncovering the detailed pathways responsible for remarkable photophysical properties and engineering materials with enhanced optoelectronic properties. In this work, high pressure is employed to reveal the self‐trapped exciton (STE) emission features of a 1D lead bromide perovskitoid (HM)Pb2Br6. Upon compression, a remarkable 42‐fold enhancement in the intensity compared to the initial emission, along with exciton transfer from STE emission to narrow free exciton emission, is achieved in (HM)Pb2Br6. These phenomena are related to the anisotropic compression of (HM)Pb2Br6, which results in enhanced structural stiffness and a significant reduction in the distances of Pb─Pb bond lengths between inter‐[Pb2Br6]2− chains, as well as Pb─Br bond lengths within the three basic intra‐[Pb2Br6]2− octahedra. These results provide essential insights into the intriguing photophysics of STEs and shed new light on the dramatic exciton transfer to control and enhance the optical properties of the metal halide perovskites.
Pressure‐Induced Excitation‐Dependent Emission Color Tuning and Enhancement in 1D Zigzag Edge‐Sharing Perovskites (C6H10N2)PbX4 (X = Br, Cl)
Authors: Wu Xueqian , Sun Yiyang , Wang Lingrui , Huang Yijia , Wang Jiaxiang , Yuan Yifang , Shahzadi Urooj , Fu Ruijing , Wang Kai , Guo Haizhong 
Published: November 2024

Abstract1D zigzag edge‐sharing perovskites have generated intense research interest due to their unique structures and optoelectronic properties. Recent efforts have focused on refining these structures to enhance their efficiency across various applications. Herein, high‐pressure is utilized to modulate the properties of two Pb‐based perovskites, (AMP)PbCl4 and (AMP)PbBr4 (where AMP2+ = C6H10N22+), characterized by 1D zigzag edge‐sharing [PbX4]2−∞ chains linked by AMP through hydrogen bonding. An inverse excitation‐dependent emission phenomenon and emission enhancement are observed in these two perovskites, attributed to the contraction of inhomogeneously coordinated [PbX6]4− octahedra. Pressure‐induced lattice contraction promotes the overlap of Pb and X orbitals, resulting in a decrease in the bandgap. Concurrently, pressure‐induced phase transitions, due to the distortion of [PbX6]4− octahedra, lead to discontinuous decreases in the bandgap. These high‐pressure optical and structural explorations facilitate the systematic design of halide perovskites with desired characteristics.
Heater‐Embedded Visible‐Light Phototransistor Based on Cd‐Doped IGZO Film Fabricated through Microwave‐Assisted Sol–Gel Process
Authors: Kim Eun‐Ha , Ha Tae‐Jun 
Published: November 2024

AbstractA phototransistor with a sol–gel‐based Cd‐doped indium‐gallium‐zinc‐oxide (IGZO) photoactive sensing channel on a dual‐purpose indium‐tin‐oxide (ITO) substrate (gate electrode and embedded transparent heater) is reported for the first time. The Cd‐doped IGZO layer is fabricated in situ by a one‐step microwave‐assisted sol–gel process with reduced temperature (<125 °C) and time (<15 min). Despite the wide bandgap of the IGZO (≈3.83 eV) channel, visible‐light (≈2 eV) photosensing is achieved in the developed phototransistor upon Cd doping owing to the reduced bandgap (≈3.71 eV) and increased density of subgap states associated with oxygen vacancies in the metal–oxygen bonding structure. In addition, the Cd‐doped IGZO phototransistor exhibits excellent operational stability (up to 10 000 cycles) and long‐term reliability (up to 30 days). Finally, the embedded Joule heater, based on the inherent transparent ITO substrate, significantly improves the recovery characteristics of the IGZO phototransistor owing to relaxation of the photoexcited charges at the oxygen‐vacancy‐related trap states upon heating, resulting in 100% recovery in a significantly reduced timeframe (≈10 s). These findings pave the way for the development of high‐performance, stable, and reliable visible‐light phototransistors based on wide‐bandgap IGZO active sensing channels with fast and full recovery, expanding their practical applicability of optoelectronics.
PEA2SnI4 Perovskite Thin Films for Photonics: Linear and Nonlinear Optical Properties and Waveguided Photoluminescence
Authors: Suárez Isaac , Sánchez‐Díaz Jesús , Pashaei Adl Hamid , Mora‐Seró Iván , Martínez‐Pastor Juan P 
Published: November 2024

AbstractIn this work, 2D PEA2SnI4 (PEA: 2‐phenylethanaminium) perovskite thin films, formed with the reducing agent NaBH4 to control the Sn+4 defects are investigated. Optical characterization of the films reveals idoneous properties for the development of photon sources, particularly an extraordinarily high absorption coefficient at the exciton resonance > 10 µm−1, the ability to enhance the light‐matter interaction due to the high refractive index. These linear optical properties are complemented with impressive nonlinear optical characteristics, involving a giant nonlinear absorption β = 7–10 cm MW−1 and a remarkably high nonlinear refractive coefficient, n2 = 1.5–4 cm2 GW−1. The integration of PEA2SnI4 films into rigid and flexible waveguides further enhances the generation of waveguided photoluminescence (PL), which is also obtained under the two‐photon absorption mechanism. The efficient generation of PL is validated by the reabsorption effect, resulting in the propagation of recycled photons over distances longer than 3 mm with an increased effective lifetime from 3 to 8.5 ns. These findings pave the way for the development of novel photonic functionalities based on these innovative low‐dimensional semiconductors.
2D Transition Metal Carbo‐Chalcogenide Nb2CSe2: A Combination of Transition Metal Dichalcogenide and MXene for Ultrafast Photonics Application
Authors: Ren Ke , Pan Zhongben , Tu Xueyang , Pan Han , Gao Kong , Li Zongsheng , Chu Hongwei , Fang Yuqiang , Li Dechun 
Published: November 2024

AbstractTransition metal carbo‐chalcogenides (TMCCs), a novel class of 2D materials, combining the distinctive properties of transition metal dichalcogenides (TMDs) and MXenes, eliciting considerable interest for their excellent properties across various fields. However, TMCCs' optical properties and potential in ultrafast photonics remain unexplored. This study investigates Nb2CSe2, a novel developed TMCC, which exhibits superior optical properties and robust environmental stability. Density functional theory calculations reveal solid near‐infrared absorption and a high density of states near the Fermi level in Nb2CSe2, indicative of high carrier mobility and robust optical responses. The nonlinear absorption coefficient of Nb2CSe2 is measured as 0.431 cm GW−1, significantly outperforming most TMDs and MXenes. Its fastest relaxation lifetime of excited carriers is on the order of hundreds of femtoseconds. The wavelength‐dependent transition of carrier dynamics and excitation intensity‐dependent transition of absorption mechanism is observed. For the first time, a TMCC‐based saturable absorber is integrated into an erbium‐doped fiber laser cavity, the evolution from Q‐switched operation to conventional soliton operation with sub‐picoseconds pulse width and dual‐wavelength complex soliton dynamics are realized, underscoring the material's superior capabilities in enhancing ultrafast laser performance. This research provides a promising platform for fundamental studies and practical applications of TMCCs in ultrafast photonics.
High‐Efficiency Luminescence and Robust Thermal Quenching Resistance in Organic–Inorganic Hybrid Indium‐Based Metal Halides
Authors: Tang Zhe , Wang Xiaochen , Bai Tianxin , Liu Siyu , Wang Shuyue , Wei Qingfeng , Fan Binbin , Chen Junsheng 
Published: November 2024

AbstractLow‐dimensional lead‐free metal halide perovskites have attracted considerable attention for the development of multifunctional optoelectronic materials owing to their extensive structural diversity and adjustable optical properties. However, organic cation‐based low‐dimensional metal halides often exhibit limited thermal stability, while inorganic cations‐based ones have a poor solution processability. To address these challenges, this study proposes a hybrid organic–inorganic cation approach by utilizing both 4,4‐difluoropiperidine (DFPD) and cesium (Cs+) to prepare low‐dimensional metal halides: (DFPD)2CsInCl6. Two isostructural metal halides are developed: α‐(DFPD)2CsInCl6 and β‐(DFPD)2CsInCl6, which exhibit different space group symmetries. This strategy ensures both thermal stability and introduces structural diversity. Doping (DFPD)2CsInCl6 with antimony (Sb3+) enhances its PLQY from 0% to 100%. The emission centers of both materials exhibit temperature‐insensitive behavior and maintain efficient and stable PL emission even at high temperatures (up to 400 K), making them excellent candidates as thermally stable phosphor materials for solid‐state lighting applications. This work thus expands the scope of developing multifunctional low‐dimensional metal halides.
Intrinsic Room‐Temperature Phosphorescent Hydrogel Driven by Phase Separation and Glass Transition
Authors: Fan Xinzhen , Gao Lu , Jin Yijie , Qiu Tian , Banquy Xavier , Zhu Xiao‐Xia , Zhao Chuanzhuang 
Published: November 2024

AbstractDesigning room‐temperature phosphorescent (RTP) hydrogels presents a unique challenge in comparison to RTP polymeric films and powders, due to the quenching of phosphorescence by water molecules within the hydrogel and their inherent softness. This study presents the first example of intrinsic RTP hydrogels without doping by luminophores or stiffening agents. The hydrogel is synthesized by copolymerizing acrylamide (Am) with N‐acryloyl‐aminoundecanoic acid (NAUA). The hydrophobic NAUA induces phase separation in the hydrogel network and the glass transition of the hydrophobic phase can stiffen the structure and constrain the mobility of water molecules and chain segments. Under such condition, the clustering of amide and carboxylic acid groups triggers the emission of RTP with a persistent afterglow exceeding 1.5 s, which is as good as the reported RTP hydrogels with dopants. When the hydrogel is heated above its glass transition temperature, its modulus drops quickly from 20.0 to 0.026 MPa within 2 s and RTP also diminishes. Taking advantage of the temperature‐switchable rigidity and RTP behavior, the hydrogels are endowed with functions such as shape memory, temperature‐sensing, and information concealment.
Unveiling Ultrafast Spin‐Valley Dynamics and Phonon‐Mediated Charge Transfer in MoSe2/WSe2 Heterostructures
Authors: Wagner Julian , Bernhardt Robin , Rieland Lukas , Abdul‐Aziz Omar , Li Qiuyang , Zhu Xiaoyang , Dal Conte Stefano , Cerullo Giulio , van Loosdrecht Paul H. M. , Hedayat Hamoon 
Published: November 2024

AbstractHelicity‐resolved ultrafast transient absorption spectroscopy is used to study spin‐valley polarization dynamics in a vertically stacked MoSe2/WSe2 heterostructure. The experimental findings reveal details of interlayer charge transfer on ultrafast timescales, showing that the spin‐valley polarized state of photoexcited carriers is conserved during the charge transfer and formation of interlayer excitons. These results confirm that phonon scattering mediates the interlayer charge transfer process, while a high phonon population at elevated temperatures causes a significant decrease in spin‐valley selective charge transfer. Moreover, the experimental findings demonstrate the possibility that interlayer excitons and their spin‐valley polarization can be probed in the optical response of intralayer excitons. These findings pave the way for ultrafast detection, control, and manipulation of spin‐valley polarized excitons in transition metal dichalcogenide‐based 2D heterostructures.
Suppress Dark‐Current for High‐Photoresponse MoS2 Transistor
Authors: Zhang Chunchi , Liu Jinxiu , Wu Haijuan , Tan Chao , Hao Xin , Wang Zegao 
Published: November 2024

AbstractDue to the atomic thickness of 2D MoS2 film, the electronic structure is easily tunable by electric field and exhibits abundant property. However, due to the limit capacitance of inorganic dielectric, the tunability is still not well exhibited. Herein, a MoS2 phototransistor with large tunability driven by ion‐gel film is fabricated. To improve the interface and reduce the dark current, the passivation layer is used to hinder the leakage current. With the passivation layer, there will be a specific barrier height on the interface of metal electrodes and ion‐gel membrane. Under effect of the PVA (polyvinyl alcohol) passivation layer, the current on/off radio can reach 107 and the mobility can reach 6.54 cm2/(Vs) superior to the one without passivation layer. There is an abnormal behavior in the transistor including positive and negative photoresponse due to the coupling of the photogating effect and the adsorption of negative ion. The photoresponsivity can increase by 29 times which can reach 603.48 A W−1 at 400 nm illumination. Furthermore, the flexible transistor based on ion‐gel can be demonstrated and it found that the transistor still has a considerable photoresponse with strain of 0.49%. This work provides a new solution for flexible wearable electronic and photoelectronic detection field.
From the Bulk to the Nanoscale: Strong Evolution in the Structure and Chiroptical Properties of Chiral Halide Double Perovskites
Authors: Maniadi Maria , Tieriekhov Kostiantyn , Ségut Olivier , Mercier Nicolas , Abhervé Alexandre 
Published: November 2024

AbstractIn the quest for lead‐free chiral metal‐halide materials, 2D double perovskites appear as very promising candidates especially for spintronic applications. However, compared to highly crystalline Pb2+ compounds, the more challenging synthetic procedure for compounds based on Ag+ and Bi3+/Sb3+ so far limited the number of these chiral materials to very few reported examples, as highlighted by the absence of crystal structure based on the extensively used (S/R)‐1‐phenylethylammonium (S/R‐MBA) cations in chiral metal halides. This study presents the successful preparation and characterization of a complete series of 2D bromide‐based and iodide‐based double perovskites based on the cations (S/R)‐1‐(4‐bromophenyl)ethylammonium (S/R‐4BrMBA), which allows to describe their structures, thin film processing, and resulting chiroptical properties. The strong modulation of the structure and circular dichroism (CD) properties at the nanoscale is unprecedented, since the thin films of (S/R‐4BrMBA)4AgBiBr8 strongly evolve from a single‐phase compound with small intrinsic CDiso to a polymorphic material showing a strong increase in the CD signal due to macroscopic effects.
Selective Enzymatic C−H‐Oxyfunctionalization for the Efficient Synthesis of Grevillic Acid
Authors: Cziegler Clemens , Baumert Benjamin , Badenhorst Christoffel P. S. , Siems Karsten , Bornscheuer Uwe T. 
Published: November 2024

AbstractIn this study, a selective C−H‐oxyfunctionalization using an unspecific peroxygenase (UPO) enabled an efficient biosynthetic route for the synthesis of grevillic acid (GA), a natural antioxidant. The route commenced with the release of o‐coumaric acid (oCA) from trans‐2‐coumaric acid glucoside (trans‐CAG) using commercially available β‐glucosidase from almonds. In addition, a cis‐to‐trans photoisomerization of cis‐CAG was implemented to increase the synthetic access of oCA. The key step, the para‐hydroxylation relative to the existing hydroxyl group of oCA, was accomplished by an UPO with full conversion and 93% isolated yield. Despite its name, the UPO turned out to exhibit excellent regioselectivity in this C−H functionalization, requiring only H2O2 as a cosubstrate.
Micro/Nanofibers for Flexible, Stretchable, and Strain‐Insensitive Wearable Electronics‐ A Review
Authors: Hanif Adeela , Kim Dong Sung 
Published: November 2024

AbstractThe development of flexible and stretchable wearable electronics has significantly advanced smart fabrics, biomedical devices, and healthcare technologies. However, these devices often face challenges from mechanical deformations that disrupt signals, emphasizing the need for strain‐insensitive architectures to maintain functionality under varying strain conditions. Progress in this field relies on multifunctional, strain‐insensitive microfibers and nanofibers (NFs) to ensure consistent performance while minimizing signal interference caused by mechanical stress. This review highlights the advantages of fibers for flexible, stretchable, and strain‐insensitive wearable electronics, analyzing materials, fabrication methods, and design strategies that optimize strain insensitivity in single free‐standing microfibers (SFMs) and NF‐based devices. It emphasizes maintaining mechanical and electrical stability under large strains through strategic material selection, advanced fiber spinning techniques, and innovative structural designs. While emphasizing SFMs, this review also provides a concise exploration of the role of NFs within this context. The applications of SFMs in wearable electronics, particularly as conductors, sensors, and components in smart textiles, are discussed with an emphasis on strain insensitivity. The review concludes by addressing challenges in this evolving field of wearable electronics and outlining future research directions, offering insights to drive innovations in fiber‐based wearable electronics for reliable, lightweight, breathable, user‐friendly, and high‐performance wearable devices.
Uncovering the Nanoscopic Humidity Ingression in Multifunctional Addivated Halide Perovskites
Authors: Kazim Samrana , Huang Junyi , Haris Muhammed P.U. , Li Xiongjie , Shi Xiaotang , Zhang Zhiguo , Berger Rüdiger , Buffeteau Thierry , Bassani Dario M. , Wang Mingkui , Ahmad Shahzada 
Published: November 2024

AbstractSulfur‐based multifunctional additives are attractive for increasing not only the device power conversion efficiency but also the moisture stability of perovskite solar cells. The stability of the device against external and internal stress plays a pivotal role in the commercial endeavor of emerging technologies such as perovskite photovoltaics. However, the potential of sulfur‐based additives remains largely unexplored for perovskite solar cell fabrication. Here, a mechanism is deduced for the local nanoscopic humidity ingression into a multifunctional additiviated formamidinium‐loaded halide perovskites. By tuning the iodide and bromide tails of the additives, the influence of sulfur heteroatom containing ammonium‐amidinium salts on the photo‐physical and device properties of a formamidinium‐rich perovskite absorber is uncovered. In addition, the process of strong water adsorption is excluded through the proton‐migration mechanism, thereby significantly improving the moisture resistance of perovskite films. The high crystallinity and long lifetime decay allow a higher PCE of 25.14% to be achieved compared to the control at 22.49%, along with improved long‐term stability by retaining 99.6% of the initial PCE after 1000 h.