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1,557 results on '"Peng, Junbiao"'

1. Machine Learning Test for Modulation Range of Ammonium Metatungstate Based Liquid Electrochromic Devices

Author

Yan, Haoyang, Li, Muyun, Ning, Honglong, Guo, Chenxiao, Li, Xinglin, Zhang, Zihan, Jiang, Bocheng, Xu, Wei, Yao, Rihui, Peng, Junbiao, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, Song, Huihui, editor, Xu, Min, editor, Yang, Li, editor, Zhang, Linghao, editor, and Yan, Shu, editor

Published
2024
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33. Impact of an oligomer deep eutectic solvent on structure and properties of natural rubber vulcanizates and their nanocomposites.

Author

Qi, Yan, Peng, Junbiao, Zhang, Chunsheng, Wang, Danling, Song, Yihu, and Zheng, Qiang

Subjects
EUTECTIC structure, CARBON-black, VULCANIZATION, NANOCOMPOSITE materials, RHEOLOGY, RUBBER
Abstract

Rubber nanocomposites exhibit strain softening under large‐amplitude oscillation shear and large‐strain cyclic tension while the softening behaviors are hard to regulate in industry. Herein, an oligomer deep eutectic solvent (DES) synthesized from polyethyleneglycol and tetrabutylammonium bromide is used to mediate the vulcanization and softening behaviors of natural rubber (NR) gums and their nanocomposites. The results show that DES could accelerate NR vulcanization and improve crosslinking density. For the hydrophilic silica nanocomposites, DES could greatly reduce tanδ and weaken weak strain overshoot accompanying Payne and lower percentages damping accompanying Mullins effects. The effects in nanocomposites filled with hydrophilic/hydrophobic silica and carbon black are investigated and compared. The investigation provides a new way for tailoring elasticity and dissipation of vulcanizate nanocomposites filled with hydrophilic silica. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Automatic measurement technology of inkjet droplet parameters.

Author

XU Wei, ZHAO Jie, YAO Rihui, NING Honglong, and PENG Junbiao

Subjects
INK, SQUARE waves, ORGANIC light emitting diodes, LIGHT sources, PROGRAMMING languages, SPRAY nozzles, INTEGRATED software, MIMO radar, PIXELS
Abstract

[Objective] The preparation of luminescent display pixels using inkjet printing technology offers significant advantages, including low cost, flexibility, and the potential for large-scale production. This approach effectively reduces the production cost of OLED displays. The process of inkjet printing organic light-emitting layers is particularly crucial and complex. It requires designing and optimizing driving waveforms to achieve stable droplet formation without satellite points. Additionally, the printing line width and thickness must be adjusted to produce a dense and uniform thin film. Before preparing display pixels, it is essential to observe the inkjet droplets and assess their stability. However, changes in driving waveform parameters, ink ratio, or printing temperature can affect various parameters, including ink droplet uniformity, stability, volume, and injection speed--changes that are often undetectable by the naked eye. [Methods] This study investigates an automatic measurement technology for inkjet droplet parameters. A droplet-driving waveform customization module has been integrated into LabVIEW software using the NI Vision visual development module. This optimization of the droplet-driving waveform aims to achieve perfect jet droplets. The droplet image is captured using phase delay technology, which employs two control signals of the same frequency and a constant phase difference. One signal is the droplet drive signal, while the other is a square wave signal that triggers the camera and strobe light source. When the first driving waveform from the nozzle arrives, another signal is output as a pulse square wave after a delay of Δt. At this moment, the strobe light source activates, and the camera captures an image of the ink droplet. When the nozzle continuously sprays ink droplets at a fixed frequency, Δt remains constant, resulting in multiple images captured by the camera that maintain consistency, giving the appearance that the ink droplets are stationary in the air. By varying the delay time Δt between the two signals, the position of the ink droplets changes, allowing for the simulation of the dynamic falling process of the ink droplets. [Results] Droplet images are obtained at different times with a phase delay of Δt = 10 µs, capturing a complete spraying process. The images undergo filter denoising, binary conversion, morphological operations, and edge detection to obtain clear droplet contours. The volume of the ink droplets is calculated using an integral formula, and the diameter of the droplets is further determined using the spherical volume formula. The spray speed of the droplets is calculated based on the differences in ink droplet positions across multiple frames of images. [Conclusions] This research on automatic measurement technology for inkjet droplet parameters has resulted in the development of a hardware device for droplet observation, with a software control system implemented in LabVIEW graphical programming language. Droplet images are captured at different times with a phase delay of Δt=10 µs. Each image undergoes filtering, denoising, binary conversion, morphological operations, and edge detection to obtain clear droplet contours, thereby capturing a complete spraying process. The effective extraction of droplet contours, along with the automatic calculation of droplet spraying speed, diameter, and volume parameters, provides a visualization tool for optimizing ink preparation and inkjet printing, thereby facilitating the production of high-quality films. [ABSTRACT FROM AUTHOR]

Published
2024
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47. A Novel Strategy to Achieve High-Performance Titanium-Doped InZnO Thin-Film Transistors Using Atomic Layer Deposition

Author

Hu, Tianxing, Li, Min, Xu, Hua, Tao, Hong, Zou, Jianhua, Zhou, Junhong, Xu, Miao, Peng, Junbiao, and Wang, Lei

Abstract

Titanium-doped InZnO (TiIZO) thin-film transistors (TFTs) with different doping concentrations were successfully fabricated using plasma-enhanced atomic layer deposition (PEALD). Specifically, TiIZO TFTs with Ti cation doping concentration of 0.5% using tetra (dimethylamino) titanium (TDMATi) exhibited a high field-effect mobility of 51.22 cm2/Vs and a small subthreshold swing (SS) of 0.24 V/decade. Furthermore, compared to undoped IZO TFTs, TiIZO TFTs exhibited enhanced bias stability under positive and negative temperature bias stress. This improvement is attributed to the appropriate Ti doping concentration, which suppresses impurity oxygen defects, reduces the trap density at the insulator/channel interface, and introduces additional charge carriers.

Published
2024
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48. High-responsivity photoelectrochemical ultraviolet photodetector based on SnO2 nanosheets-Ga2O3.

Author

Chen, Haoyan, Huang, Yucheng, Yao, Rihui, Zhang, Kangping, Guo, Chenxiao, Liu, Dingrong, Hou, Mingyue, Deng, Zeneng, Ning, Honglong, and Peng, Junbiao

Subjects
THIN films, TIN oxides, ELECTROCHEMICAL analysis, PHOTODETECTORS, HETEROJUNCTIONS
Abstract

Tin oxide (SnO2) has garnered significant attention for its high spectral selectivity when used as an ultraviolet photodetector (PD). In this study, SnO2 nanosheets (NSs) were synthesized via a hydrothermal method, followed by spin-coating a layer of Ga2O3 thin film to construct a heterojunction photoelectrochemical ultraviolet PD (PEC UV PD). Initially, we investigated the effect of precursor composition on the properties of the Ga2O3 thin films. It was observed that the thickness of the films increased with higher precursor concentrations, while the optical bandgap decreased. Based on these findings, we successfully fabricated the SnO2 NSs-Ga2O3 PEC UV PD. Electrochemical analysis revealed that as the precursor concentration used for spin-coating Ga2O3 increased, the device's responsivity and detectivity initially increased and then decreased. After optimization, the device prepared with a 0.2 M Ga(NO3)3 solution spin-coated on SnO2 exhibited excellent spectral selectivity (R 265nm/ R 420nm ∼ 4472), a responsivity of 4.86 mA W−1, and a detectivity of 2.72 × 109 Jones. This study demonstrates that coating Ga2O3 is an effective approach to constructing high-performance SnO2-based UV PDs. [ABSTRACT FROM AUTHOR]

Published
2025
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