Hejun Xu

ORCID: 0000-0002-0080-4397
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About
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Research Areas
  • Advanced Sensor and Energy Harvesting Materials
  • MXene and MAX Phase Materials
  • 2D Materials and Applications
  • Semiconductor materials and devices
  • Supercapacitor Materials and Fabrication
  • Advanced Memory and Neural Computing
  • Gas Sensing Nanomaterials and Sensors
  • Graphene research and applications
  • Conducting polymers and applications
  • Advancements in Battery Materials
  • Integrated Circuits and Semiconductor Failure Analysis
  • Thermal properties of materials
  • Methane Hydrates and Related Phenomena
  • Advanced Photocatalysis Techniques
  • Geotechnical and Geomechanical Engineering
  • Rock Mechanics and Modeling
  • Advanced Thermoelectric Materials and Devices
  • Tactile and Sensory Interactions
  • Mineralogy and Gemology Studies
  • Carbon Nanotubes in Composites
  • Electronic and Structural Properties of Oxides
  • Advanced Chemical Sensor Technologies
  • Power Systems and Renewable Energy
  • Geological and Geochemical Analysis
  • Ferroelectric and Negative Capacitance Devices

Ukrainian National Tchaikovsky Academy of Music
2024-2025

Shanghai Electric (China)
2024

East China Normal University
2017-2023

State Key Laboratory of Transducer Technology
2017

Mechanical flexible electronic skin has been focused on sensing various physical parameters, such as pressure and temperature. The studies of material design array-accessible devices are the building blocks strain sensors for subtle sensing. Here, we report a new facile preparation graphene hybrid structure with an ultrafast dynamic response. Graphene oxide nanosheets used surfactant to prevent restacking in aqueous solution. This exhibits frequency-independent resistive property. Exceeding...

10.1021/acsami.7b07311 article EN ACS Applied Materials & Interfaces 2017-06-21

Flexible in-plane solid-state supercapacitor fabricated by CVD-grown metallic VSe<sub>2</sub>nanosheets presents excellent mechanical stability and high energy density.

10.1039/c8ta00089a article EN Journal of Materials Chemistry A 2018-01-01

Two-dimensional (2D) materials have become a hot study topic in recent years due to their outstanding electronic, optical, and thermal properties. The unique band structures of strong in-plane chemical bonds weak out-of-plane van der Waals (vdW) interactions make 2D promising for nanodevices various other applications. Raman spectroscopy is powerful non-destructive characterization tool the properties materials. In this work, we review research on with spectroscopy. addition, discuss...

10.1088/1674-1056/27/3/037802 article EN Chinese Physics B 2018-03-01

Two-dimensional (2D) metallic transition-metal dichalcogenide (MTMD)/carbon-nanotube (CNT) compounds are competitive electrode materials for solid-state flexible in-plane supercapacitors, resulting from the synergistic effect of large specific surface area 2D MTMDs and excellent mechanical properties CNT. In this paper, high-quality VSe2/CNT material is prepared by one-step chemical vapor deposition (CVD) method. The CVD method offers a facile safe way to synthesize pure compound. VSe2...

10.1063/1.5078555 article EN Applied Physics Letters 2019-01-14

The advancement of flexible wearable humidity sensors presents significant potential for smart healthcare and monitoring training/learning states. These devices enable real-time detection ambient respiratory conditions, aiding in the prevention diseases improving accuracy vocal phonation training. In this study, we present a high-performance sensor using an Ag/PEDOT composite as humidity-sensitive material. film's morphology elemental composition were analyzed via SEM, HRTEM, mapping, while...

10.1021/acsaelm.4c02235 article EN ACS Applied Electronic Materials 2025-03-24

Alloying is critical for regulating the electron states of layered two-dimensional (2D) materials, which has a significant influence on physical and chemical properties 2D such as electrochemical catalysis, magnetism, bandgap semiconductors. Here, we report alloy Fe-doped VSe2 with good homogeneity at atomic level by using one-step synthesis method. presents enhanced hydrogen evolution reaction (HER) performance. It found that shows improved catalytic activity compared to virgin VSe2,...

10.1063/5.0008092 article EN Applied Physics Letters 2020-06-01

In this work, we investigate the resistive switching in hafnium dioxide (HfO2) and aluminum oxide (Al2O3) bilayered stacks using in-situ transmission electron microscopy X-ray energy dispersive spectroscopy. Conductance of HfO2/Al2O3 stack changes gradually upon electrical stressing which is related to formation extended nanoscale physical defects at interface migration re-crystallization Al into bulk. The results suggest two competing mechanisms including redistribution oxygen ions species...

10.1016/j.apmt.2023.101739 article EN cc-by Applied Materials Today 2023-01-20

Abstract Two-dimensional (2D) transition metal dichalcogenides alloys are potential materials in the application of photodetectors over a wide spectral range due to their composition-dependent bandgaps. The study bandgap engineering is important for 2D devices. Here, we grow Mo 1− x W Se 2 on mica, sapphire and SiO /Si substrates by chemical vapor deposition (CVD) method. grown mica CVD method first time. Photoluminescence (PL) spectroscopy used investigate effects interlayer coupling force...

10.1088/1674-4926/40/6/062005 article EN Journal of Semiconductors 2019-06-01

With the advancements in technology, there is an increasing demand for enhanced flexibility and convenience flexible wearable sensors. A composite nanohydrogel sensor with excellent mechanical properties, high sensitivity, stability, real-time monitoring was prepared this work. The hydrogel made up of polyacrylamide, poly(vinyl alcohol), V2C nanosheets. integration conductive nanosheets substantially enhances sensor's conductivity sensitivity. At same tensile strain, increased by 80%...

10.1021/acsapm.4c03103 article EN ACS Applied Polymer Materials 2024-11-11

The robustness of electrostatic sensitive devices is important in state-of-the-art silicon technology. However, the electrical breakdown-induced microstructure evolution remains unclear. In this work, we performed physical failure analysis breakdown an enhanced modified lateral silicon-controlled rectifier-based discharge (ESD) device. Direct visualization conductive metal filaments doped substrate has been achieved by high-resolution transmission electron microscopy. locations these induced...

10.1109/ted.2021.3053501 article EN IEEE Transactions on Electron Devices 2021-02-12

The ultrastable metal electrodes that can withstand the mechanical deformations of soft substrates are always essential for development flexible supercapacitors. However, electrode physically deposited on substrate is rigid and delaminated, contact interface easily degraded under cycling. highly conductive composites with intermixed metal–polymer structure as key to solving problem. In this work, a universal facile method micro-supercapacitors (MSCs) combination nickel electroless plating...

10.1021/acsaem.8b01629 article EN ACS Applied Energy Materials 2018-12-03

Abstract Distributed photovoltaic power generation system usually adopts series wiring scheme, which has problems such as high voltage DC electrical safety risk, mismatch of modules and maintenance management difficulty. Three schemes module level electronics technology are proposed, including string inverter with rapid shutdown device, optimizer micro inverter. The shut-off, data monitoring, optimization function characteristics each scheme described compared, the suggested application...

10.1088/1742-6596/2731/1/012020 article EN Journal of Physics Conference Series 2024-03-01
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