bluuebunny/crossref_metadata_2025_split huggingface dataset:
Iterative parameter identification for Hammerstein systems with ARMA noises by using the filtering identification idea
Authors: Bedoui Saida , Abderrahim Kamel , Ding Feng 
Published: June 2024

SummaryIn practical applications, many processes have nonlinear characteristics that require nonlinear models for accurate description. However, constructing such models and determining their parameters are a challenging task. This article explores filtered identification methods for estimating the parameters of a particular type of nonlinear Hammerstein systems with ARMA noise. An auxiliary model‐based least squares algorithm is developed for such systems based on the auxiliary model identification idea. A hierarchical least squares algorithm that utilizes the hierarchical identification principle is proposed to enhance computational efficiency. Additionally, a key term separation technique is employed to express the system output as a linear combination of parameters, allowing the system to be decomposed into smaller subsystems for more efficient estimation of parameters. Simulation results demonstrate the effectiveness of these proposed algorithms.
Transforming an Ionic Conductor into an Electronic Conductor via Crystallization: In Situ Evolution of Transference Numbers and Structure in (La,Sr)(Ga,Fe)O3‐x Perovskite Thin Films
Authors: Buckner Haley B. , Simpson‐Gomez Joshua , Bonkowski Alexander , Rübartsch Kathrin , Zhou Hua , De Souza Roger A. , Perry Nicola H. 
Published: June 2024

AbstractMixed‐conducting perovskites are workhorse electrochemically active materials, but typical high‐temperature processing compromises their catalytic activity and chemo‐mechanical integrity. Low‐temperature pulsed laser deposition of amorphous films plus mild thermal annealing is an emerging route to form homogeneous mixed conductors with exceptional catalytic activity, but little is known about the evolution of the oxide‐ion transport and transference numbers during crystallization. Here the coupled evolution of ionic and electronic transport behavior and structure in room‐temperature‐grown amorphous (La,Sr)(Ga,Fe)O3‐x films as they crystallize is explored.
In situ ac‐impedance spectroscopy with and without blocking electrodes, simultaneous capturingsynchrotron‐grazing‐incidence X‐ray diffraction, dc polarization, transmission electron microscopy, and molecular dynamics simulations are combined to evaluate isothermal and non‐isothermal crystallization effects and the role of grain boundaries on transference numbers. Ionic conductivity increases by ≈2 orders of magnitude during crystallization, with even larger increases in electronic conductivity. Consequently, as crystallinity increases, LSGF transitions from a predominantly ionic conductor to a predominantly electronic conductor. The roles of evolving lattice structural order, microstructure, and defect chemistry are examined. Grain boundaries appear relatively nonblocking electronically but significantly blocking ionically. The results demonstrate that ionic transference numbers can be tailored over a wide range by tuning crystallinity and microstructure without having to change the cation composition.
Microwave Assisted Ultrafast, Selective Lithium Extraction in Deep Eutectic Solvent for LIB Cathode Recycling
Authors: Alhashim Salma H. , Bhattacharyya Sohini , Ajayan Pulickel M 
Published: June 2024

AbstractThe exponential rise in the use of LIBs raises concerns over the supply chain of critical metals, e.g., Li, Co, and Ni, used in their cathodes. Deep Eutectic Solvents (DES) are considered as green lixiviants for hydrometallurgical recycling of cathodes to recover these metals, although their efficiencies are still not at par with conventionally used harsh inorganic solvents. Here it is demonstrated that when assisted by microwave, a choline chloride (ChCl): ethylene glycol (EG) based DES shows ultrafast selective extraction of Li from different commercially used cathode compositions, with a leaching efficiency of >50% in just 30 s and nearly 100% in ≈ 30 min. The ultrafast selective Li leaching can be attributed to microwave irradiation‐induced preferential non‐thermal activation of the polar ChCl in the DES. The rapid microwave approach allows time and energy‐efficient recovery of Li and also prevents the degradation of DES, as is seen in conventional prolonged high‐temperature procedures, and is able to extract Li from high solid/liquid concentrations of LIB cathodes in DES.
Dynamic Response and Swift Recovery of Filament Heater‐Integrated Low‐Power Transparent CNT Gas Sensor
Authors: Chae Myoungsu , Lee Doowon , Kim Hee‐Dong 
Published: June 2024

AbstractDesigning a transparent carbon nanotube (CNT) gas sensor for nitrogen dioxide (NO2) detection at room temperature (RT), which is unaffected by humidity, is a critical challenge in various technologies. To solve this issue, a filament‐based memristor heater (MH) embedded low‐power CNT gas sensor is proposed to address humidity‐related issues, and dynamic response with a low power consumption of 6.15 µW and swift recovery of <1 ms/30.8 µW is successfully demonstrated, without any serious effects on humidity. This study reveals that the MH can effectively heat the surface of the active region due to the joule heating effect, which improves the absorption and desorption of the target gases and mitigates the influence on the humidity, which is in a response that is below 7.5%. As a result, it is believed that the proposed MH‐embedded transparent CNT gas sensors can address the humidity issues and slow response/recovery with ultralow‐power consumption and high‐accuracy gas sensing characteristics.
Mechanism of Antiferroelectricity in Polycrystalline ZrO2
Authors: Ganser Richard , Lomenzo Patrick D. , Collins Liam , Xu Bohan , Antunes Luis Azevedo , Mikolajick Thomas , Schroeder Uwe , Kersch Alfred 
Published: June 2024

AbstractThe size and electric field dependent induction of polarization in antiferroelectric ZrO2 is the key to several technological applications that are unimaginable a decade ago. However, the lack of a deeper understanding of the mechanism hinders progress. Molecular dynamics simulations of polycrystalline ZrO2, based on machine‐learned interatomic forces with near ab initio quality, shed light on the fundamental mechanism of the size effect on the transition fields. Stress in the oxygen sublattice is the most important factor. The so constructed interatomic forces allow the calculation of the transition fields as a function of the ZrO2 film thickness and predict the ferroelectricity at large thickness. The simulation results are validated with electrical and piezo response force microscopy measurements. The results allow a clear interpretation of the properties of the double‐hysteresis loops as well as the construction of the free energy landscape of ZrO2 grains.
Lasing‐Assisted Synthesis of Metal–Organic Frameworks (MOFs) and Its Application to Memory and Neuromorphic Devices
Authors: Han Seung Woo , Lee Chang Taek , Song Young‐Woong , Yoon Yeowon , Kwon Jang‐Yeon , Yang Lianqiao , Shin Moo Whan 
Published: June 2024

AbstractRecently, metal–organic frameworks (MOFs) have gained attention in the field of electronics owing to their capability to tune their electrical characteristics. However, conventional methods for synthesizing MOFs pose challenges for their integration into electronic devices because of their long synthesis times and complex transfer steps. In this study, for the first time, lasing‐assisted synthesis (LAS) is used to rapidly and directly synthesize MOFs. These are applied to resistive random access memory (RRAM) devices. Using the LAS method, Cu(BDC) and Cu(BTC) are synthesized in a remarkably short time (≈5 min) and formed directly on metal substrates as thin films. This simplified their integration into RRAMs. The Cu(BDC)‐ and Cu(BTC)‐based RRAMs are evaluated for their potential in memory and neuromorphic applications. Both devices demonstrated nonvolatile memory capabilities with a remarkable data retention time of 104 s and long‐term plasticity (LTP) in response to voltage stimuli. However, the suitability of each device for a specific application varies depending on the type of MOFs used. The Cu(BTC)‐based RRAM is more suitable for memory applications because of its higher on/off ratio, longer endurance, and more data storage capacity. Conversely, Cu(BDC)‐based RRAM is highly effective in neural network simulation, achieving higher classification accuracy.
Elucidating the Microenvironment Structure‐Activity Relationship of Cu Single‐Site Catalysts via Unsaturated N,O‐Coordination for Singlet Oxygen Production
Authors: Li Pengfei , Deng Yang , Wang Haiyuan , Luo Yali , Che Yin , Bian Ruijuan , Gao Ruoyun , Wu Xianfeng , Zhang Zhen , Wu Xu 
Published: June 2024

AbstractUnderstanding the microenvironment structure‐activity relationship of singlet‐atom catalysts (SACs) is imperative for the development of high‐performance photocatalytic devices. However, the challenge remains to finely regulate the coordination microenvironment of SACs. Herein, single‐atom Nx─Cu─O4‐x (x = 1–4) photocatalysts with different coordination environments are successfully prepared based on pre‐design reticular supramolecular covalent organic frameworks (COFs) for direct photocatalytic 1O2 production from O2. The results show that the high activity of Cu SACs is closely related to the N,O‐coordination microenvironment, which is primarily ascribed to the different electrophilicity of the N, O atom. The electron configuration of N3‐Cu‐O1 endows photocatalyst enhanced charge transfer capability and the nearest D‐band center to the Fermi level. The “end‐on” type adsorption configuration of O2 at the N3─Cu─O1 active site can promote the breaking of Cu─O bonds rather than O─O bonds. As a result, the N3‐Cu‐O1@COF photocatalyst exhibits the most optimal formation and desorption energies for intermediates •OOH, which provides an advantageous reaction pathway with fewer steps and a lower barrier for 1O2 production. This work highlights the structure‐activity relationship of SACs for long‐term applications.
Polyoxometalates: Cascading Functionality to Unique On‐Off Organic Photoelectrochemical Transistor Operation
Authors: Chen Feng‐Zao , Hou Lu , Gao Yuan , Zhou Jia‐Yi , Kong Fen‐Ying , Han De‐Man , Zhao Wei‐Wei 
Published: June 2024

AbstractWhile existing polyoxometalates (POMs) are predominantly utilized in a range of energy devices, their potential in bioelectronics and optoelectronics, particularly in organic photoelectrochemical transistors (OPECTs), remains unexplored. Here, the potential of POMs in this aspect is unveiled by a POM/sulfide‐gated OPECT. The representative PW12/ZnIn2S4 with cascading light‐harvesting and enzyme‐like functionality enables unique on‐off OPECT operation. The incorporation of PW12 facilitates the separation of photogenerated charge carriers across the heterojunction interface, consequently inducing a pronounced gating effect. Linking with a CRISPR/Cas13a system correlating the target miRNA‐21 and biological generation of H2O2, the PW12 will enable the polymerization of dopamine into polydopamine and thus sensitively inhibit the OPECT gating. Experimental results demonstrated that the developed OPECT sensor achieved good analytical performance with a detection limit as low as 3.9 fm. This study demonstrates the potential of POMs in OPECT. Given the large family and multifunction of POMs, its implications in the diverse bioelectronics and optoelectronics are expected.
Nano‐Biointeractions of Functional Nanomaterials: The Emerging Role of Inter‐Organelle Contact Sites, Targeting, and Signaling
Authors: Blal Naym , Bardi Giuseppe , Pompa Pier Paolo , Guarnieri Daniela 
Published: June 2024

AbstractThe study of nano‐biointeractions, at the forefront of interdisciplinary research, unveils intricate interplays between nanomaterials (NMs) and intracellular organelles, which are pivotal hubs orchestrating diverse cellular processes. Thanks also to the formation of dynamic contacts among their membranes, organelles regulate lipid exchange, calcium signaling, and metabolic pathways. Recently, the potential role of NMs in cellular homeostasis through the regulation of organelle membrane contact sites (MCSs) is emerging, and a complete overview of this issue is still lacking. This perspective aims at elucidating the synergy between functional NMs and organelle contact site research, underscoring the pivotal role of NMs in advancing the comprehension of cell biology mechanisms and fostering therapeutic breakthroughs. This subject represents a crucial aspect of nano‐biointeractions, as it can reveal new molecular targets for NMs and potentially revolutionize therapeutic strategies. Nanotechnology may offer unprecedented tools to decipher and manipulate dynamic organelle interfaces with remarkable precision. Engineered nanomaterials may serve as versatile probes and effectors, enabling targeted modulation of organelle contact sites and unraveling the molecular intricacies governing organelle dynamics. Furthermore, nano‐biointeraction‐driven insights hold promise for therapeutic innovations, offering novel avenues in diseases linked to dysregulated organelle contacts.
A H₂S‐Evolving Alternately‐Catalytic Enzyme Bio‐Heterojunction with Antibacterial and Macrophage‐Reprogramming Activity for All‐Stage Infectious Wound Regeneration
Authors: He Miaomiao , Wang Zuyao , Xiang Danni , Sun Dan , Chan Yau Kai , Ren Huilin , Lin Zhijie , Yin Guangfu , Deng Yi , Yang Weizhong 
Published: June 2024

AbstractThe disorder of the macrophage phenotype and the hostile by‐product of lactate evoked by pathogenic infection in hypoxic deep wound inevitably lead to the stagnant skin regeneration. In this study, hydrogen sulfide (H2S)‐evolving alternately catalytic bio‐heterojunction enzyme (AC‐BioHJzyme) consisting of CuFe2S3 and lactate oxidase (LOD) named as CuFe2S3@LOD is developed. AC‐BioHJzyme exhibits circular enzyme‐mimetic antibacterial (EMA) activity and macrophage re‐rousing capability, which can be activated by near‐infrared‐II (NIR‐II) light. In this system, LOD exhausts lactate derived from bacterial anaerobic respiration and generated hydrogen peroxide (H2O2), which provides an abundant stock for the peroxidase‐mimetic activity to convert the produced H2O2 into germicidal •OH. The GPx‐mimetic activity endows AC‐BioHJzyme with a glutathione consumption property to block the antioxidant systems in bacterial metabolism, while the O2 provided by the CAT‐mimetic activity can generate 1O2 under the NIR‐II irradiation. Synchronously, the H2S gas liberated from CuFe2S3@LOD under the infectious micromilieu allows the reduction of Fe(III)/Cu(II) to Fe(II)/Cu(І), resulting in sustained circular EMA activity. In vitro and in vivo assays indicate that the CuFe2S3@LOD AC‐BioHJzyme significantly facilitates the infectious cutaneous regeneration by killing bacteria, facilitating epithelialization/collagen deposition, promoting angiogenesis, and reprogramming macrophages. This study provides a countermeasure for deep infectious wound healing via circular enzyme‐mimetic antibiosis and macrophage re‐rousing.
Strategies to Control Crystal Growth of Highly Ordered Rubrene Thin Films for Application in Organic Photodetectors
Authors: Hofmann Anna‐Lena , Wolansky Jakob , Hambsch Mike , Talnack Felix , Bittrich Eva , Winkler Lucy , Herzog Max , Zhang Tianyi , Antrack Tobias , Winkler L. Conrad , Schröder Jonas , Riede Moritz , Mannsfeld Stefan C.B. , Benduhn Johannes , Leo Karl 
Published: June 2024

AbstractOrganic semiconductors still lag behind their inorganic counterparts in terms of mobility due to their lower structural order, in particular in thin films. Here, the highly ordered phase of triclinic rubrene – characterized by high vertical hole mobility – grown from a vacuum‐deposited thin film is used by post‐annealing and implemented into organic photodetectors. Since the triclinic rubrene exhibits a high roughness with a peak‐to‐valley value of 250 nm, which is detrimental to the dark current, strategies to control the crystal growth are developed. These investigations show that a suppression layer of 20 nm C60 is the most promising approach to successfully reduce the surface roughness while maintaining the triclinic phase, proven by grazing‐incidence wide‐angle X‐ray scattering (GIWAXS). With the smoothened active layer, the dark current density is reduced by three orders of magnitude compared to the neat rubrene layer. It is as low as 2.5 × 10−10 A cm−2 at −0.1 V bias, reflected in an overall specific detectivity of 6 × 1011 Jones at zero bias (based on noise measurements) and a high linear dynamic range of 170 dB. This strategy using a suppression layer thus proves successful and is very promising to be applied to other crystalline materials.
Universal Enhancement Effect of Nonlinear Optical Response from Band Hybridization
Authors: Lai Junwen , Zhan Jie , Liu Peitao , Shirakawa Tomonori , Seiji Yunoki , Chen Xing‐Qiu , Sun Yan 
Published: June 2024

AbstractBulk photovoltaic effect, i.e. shift current, is a nonlinear second‐order optical response that can rectify an alternating current (AC) electric field into a direct current (DC). Depending on the wavelength of the incident light, shift current finds applications in various fields, including solar energy conversion and radiation detection. Its promising application in energy conversion and information processing has inspired investigations to uncover the relationship between shift current and electronic structures of materials. Despite numerous efforts dedicated to designing principles for strong bulk photovoltaic effect materials, the only widely accepted crucial parameter is the joint density of states (JDOS). In this study, employing effective model analysis and first‐principles calculations, an enhancement effect of bulk photovoltaic effect is found to arise from band hybridization that is typically along with anti‐crossing‐like electronic band structures, similar to the Berry curvature effects in intrinsic anomalous Hall conductivity. While this mechanism does not offer a comprehensive understanding of the relationship between electronic structure and the magnitude of bulk photovoltaic effect, it represents practical progress in the design of materials with strong bulk photovoltaic effect.
Integrated Optical Microrings on Fiber Facet for Broadband Ultrasound Detection
Authors: Sun Jialve , Hou Feiyang , Feng Shengfei , Li Changhui 
Published: June 2024

AbstractThe miniature optical fiber ultrasound sensor with high sensitivity and bandwidth is important for the field of ultrasonic detection. In this study, a unique fiber ultrasound sensor via integrating optical microrings on a multicore fiber facet is reported. The results demonstrate this sensor can be used in liquid environment and has high sensitivity with broadband bandwidth. The detector's equivalent noise pressure (NEP) can reach 13.2 mPa Hz−1/2 with a broadband ultrasound response over 250 MHz (103 MHz in −6 dB). Besides, this sensor is resistant to environmental impurities. The sensor is successfully applied to photoacoustic microscopy (PAM) with a lateral resolution of 5 µm and an axial resolution of 6.6 µm. Furthermore, an integrated transceiver structure for ultrasound/photoacoustic detection is proposed, which has great application prospects for using in constrained tiny spaces, such as endoscopy, or closely scanning over uneven surfaces.
Study on the Oxygen Partial Pressure Dependent Annealing Effect for SiO2/SiC Stack
Authors: Zhang Qian , You Nannan , Wang Jiayi , Xu Yang , Zhang Kuo , Wang Shengkai 
Published: June 2024

AbstractPost‐oxidation annealing in oxygen (O2) ambient can improve the quality of the SiO2/SiC stack without introducing foreign atoms. In order to reveal the annealing mechanism at different oxygen partial pressures (P(O2)), this work focuses on the dependence of the annealing effect on P(O2) in a wide range from 0.01 Pa to 101 kPa for SiO2/SiC stack. In order to minimize the C‐related defects generated during SiC oxidation, the SiO2/SiC stacks are formed by oxidizing the deposited Si on the SiC epitaxial layer. The electrical characteristics of the annealed samples show that low P(O2) is beneficial to improve the interface quality, and high P(O2) is beneficial to improve the oxide layer quality. In addition, time of flight secondary ion mass spectrometry and X‐ray photoelectron spectroscopy analysis shows that the distribution and filling of oxygen vacancies (V[O]) are consistent with the electrical results. Finally, a model describing V[O] filling amount with P(O2) is proposed to quantitatively characterize the dependence of the annealing effect on P(O2), which shows that the filling amount of V[O] is proportional to P(O2)n (n∼0.065). This model provides theoretical support for improving the quality of SiC MOS by O2 annealing.
Inkjet‐Printed Phase Change Memory Devices
Authors: He Hanglin , Kumaar Dhananjeya , Portner Kevin , Zellweger Till , Schenk Florian M. , Wintersteller Simon , Vlnieska Vitor , Emboras Alexandros , Wood Vanessa , Yarema Maksym 
Published: June 2024

AbstractPhase change memory (PCM) is among the most promising candidates for the next generation of storage‐class and main memory systems in the computing era beyond Moore's law. However, the widespread installment of PCM devices is limited by the high price‐per‐bit and complex fabrication process. In this paper, it is shown that functional PCM memory devices can be printed, proving low‐cost avenues for non‐silicon memory technologies. Taking Ge‐Sb‐Te (GST) as a case study, PCM inks are prepared and optimize their structural, rheological, and printing parameters. GST layers are then printed onto PCM devices in the planar configuration, showing excellent performance, such as non‐volatility, resistivity contrast, low cycle‐to‐cycle variability, and endurance of at least 100 cycles. This paper provides a novel approach to liquid‐based engineered PCM devices through inkjet printing, enabling patterned memory layers, lower price‐per‐bit, and customizable multi‐material PCM arrays.
Strain Driven Electrical Bandgap Tuning of Atomically Thin WSe2
Authors: Islam Md Akibul , Nicholson Eric , Barri Nima , Onodera Momoko , Starkov Danny , Serles Peter , He Shuo , Kumral Boran , Zavabeti Ali , Shahsa Haleh , Cui Teng , Wang Guorui , Machida Tomoki , Singh C.V. , Filleter Tobin 
Published: June 2024

AbstractTuning electrical properties of 2D materials through mechanical strain has predominantly focused on n‐type 2D materials like MoS2 and WS2, while p‐type 2D materials such as WSe2 remain relatively unexplored. Here, the impact of controlled mechanical strain on the electron transport characteristics of both mono and bi‐layer WSe2 is studied. Through coupling atomic force microscopy (AFM) nanoindentation techniques and conductive AFM, the ability to finely tune the electronic band structure of WSe2 is demonstrated. The research offers valuable mechanistic insights into understanding how WSe2's electronic properties respond to mechanical strain, a critical prerequisite for the development of flexible photoelectronic devices. It is also observed that under high pressure, the AFM tip/monolayer WSe2/metal substrate junction transitions from Schottky to Ohmic contact, attributed to significant charge injection from the substrate to the WSe2. These findings are significant for designing efficient metal/semiconductor contact in thin and flexible PMOS (p‐type Metal–Oxide–Semiconductor) devices.