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147 results on '"Yao, Jian‐Lin"'

4. Insight into Multiphase Interlayer Molecular Packing and Stepwise Phase Transition in 4-(Phenylazo)benzoate Anion-Intercalated Layered Zinc Hydroxide

Author

Zhang, Jing-Ru, Mo, Yi, Fang, Wei, Yuan, Ya-Xian, Yao, Jian-Lin, and Wu, Ji Hong

Abstract

The properties of layered intercalation hybrids are closely related to interlayer molecular packing. To develop functional intercalation hybrids, it is essential to gain deep insights into interlayer molecular packing. This work reports a new comprehensive insight into the controllable multiphase interlayer molecular packing in 4-(phenylazo)benzoate anion-intercalated layered zinc hydroxide (LZH-4-PAB intercalation hybrids). The new insight breaks up the general understanding that the interlayer molecular packing of anions is usually single-phase, lacking diversity and controllability. Furthermore, it uncovers an interesting stepwise rather than the generally expected continuous phase transition of the interlayer molecular packing. The intercalated 4-PAB anions initially organize into the horizontal monolayer packing (θ = 0°, Phase I), which stepwise transforms to the tilted interdigitated antiparallel bilayer packing (θ ≈ 50°, Phase II) along with an increased intercalation loading and eventually to the vertical interdigitated antiparallel bilayer packing (θ = 90°, Phase III). The LZH-4-PAB hybrids exhibited a greatly enhanced interlayer molecular packing-dependent UV–vis absorption. This study provides helpful guidance for developing property-tailored intercalation hybrids. It may attract new interest in more layered intercalation hybrids. New and rich intercalation chemistry might be discovered in more functional intercalation hybrids beyond the 4-PAB anion-intercalated layered zinc hydroxide.

Published
2024
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9. Resolving nanostructure and chemistry of solid-electrolyte interphase on lithium anodes by depth-sensitive plasmon-enhanced Raman spectroscopy.

Author

Gu, Yu, You, En-Ming, Lin, Jian-De, Wang, Jun-Hao, Luo, Si-Heng, Zhou, Ru-Yu, Zhang, Chen-Jie, Yao, Jian-Lin, Li, Hui-Yang, Li, Gen, Wang, Wei-Wei, Qiao, Yu, Yan, Jia-Wei, Wu, De-Yin, Liu, Guo-Kun, Zhang, Li, Li, Jian-Feng, Xu, Rong, Tian, Zhong-Qun, and Cui, Yi

Subjects
RAMAN spectroscopy, SERS spectroscopy, COPPER, SURFACE plasmons, GOLD nanoparticles, ANODES, FLUOROETHYLENE
Abstract

The solid-electrolyte interphase (SEI) plays crucial roles for the reversible operation of lithium metal batteries. However, fundamental understanding of the mechanisms of SEI formation and evolution is still limited. Herein, we develop a depth-sensitive plasmon-enhanced Raman spectroscopy (DS-PERS) method to enable in-situ and nondestructive characterization of the nanostructure and chemistry of SEI, based on synergistic enhancements of localized surface plasmons from nanostructured Cu, shell-isolated Au nanoparticles and Li deposits at different depths. We monitor the sequential formation of SEI in both ether-based and carbonate-based dual-salt electrolytes on a Cu current collector and then on freshly deposited Li, with dramatic chemical reconstruction. The molecular-level insights from the DS-PERS study unravel the profound influences of Li in modifying SEI formation and in turn the roles of SEI in regulating the Li-ion desolvation and the subsequent Li deposition at SEI-coupled interfaces. Last, we develop a cycling protocol that promotes a favorable direct SEI formation route, which significantly enhances the performance of anode-free Li metal batteries. The solid-electrolyte interphase is crucial for most batteries, but its characterization is challenging. Here, authors develop a depth-sensitive plasmon-enhanced Raman spectroscopy method to enable in-situ and nondestructive resolving of its structure and chemistry as well as formation mechanisms. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Surface Enhanced Raman Spectroscopic Studies on Surface Plasmon Resonance Catalytic Activity of TiO2-Metal Nanocomposites

Author

Lu, Yan Hua, Xu, Min Min, Zhang, Chen Jie, Yuan, Ya Xian, and Yao, Jian Lin

Abstract

The rapid recombination of carriers on plasmon metal nanoparticles leads to relatively low efficiency of traditional photocatalysts. The combination of a metal and a semiconductor allows to the separation of hot electrons and holes to improve photocatalytic efficiency. In this study, Au nanoparticles were integrated with semiconductor TiO2 nanoparticles of different sizes to improve the photocatalytic activity. Various techniques have been developed to study the mechanism of catalytic activity, the significance of band bending in the space-charge region within metal–semiconductor nanocomposites, and the built-in electric field. The results provide theoretical and experimental evidence for the design of a high-performance surface plasmon resonance (SPR) photocatalyst. To reveal the interface band structure, surface-enhanced Raman spectroscopy (SERS) was employed to analyze the band structure of the TiO2–metal composites. This approach was based on the electrochemical Stark effect and a molecular probe strategy, combined with X-ray photoelectron spectroscopy (XPS), Electrochemical impedance spectroscopy (EIS), and other techniques at the molecular level. The results demonstrated that charge transfer occurred spontaneously between the Au nanoparticles and TiO2, and that the TiO2–metal interface constitutes a Schottky barrier. Moreover, the size of the TiO2 nanoparticles affects the degree of band bending. Optimal state matching was achieved with TiO2 (60 nm)–Au, improving the photocatalytic activity of the nanocomposite. The photocatalytic coupling reaction of p-aminothiophenol (PATP) acted as a probe to study the catalytic performance of TiO2–metal nanocomposites. The results revealed that the introduction of TiO2 improves the SPR catalytic activity of Au, mainly through the efficient separation of electrons and holes at the TiO2–metal interface.

Published
2023
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20. Exploring electrosorption at iron electrode with in situ surface-enhanced infrared absorption spectroscopy

Author

Huo, Sheng-Juan, Wang, Jin-Yi, Yao, Jian-Lin, and Cai, Wen-Bin

Subjects
Electrochemical reactions -- Observations, Iron -- Electric properties, Infrared spectroscopy -- Methods, Electrodes -- Chemical properties, Chemistry
Abstract

Surface-enhanced infrared absorption spectroscopy (SEIRAS) in attenuated total reflection (ATR) configuration has been extended to the Fe electrode/electrolyte interface in neutral and weakly acidic solutions for the first time. The SEIRA-active Fe film electrode was obtained through a potenfiostatic electrodeposition of a virtually pinhole-free 40 nm-thick Fe overfilm onto a 60 nm-thick Au underfilm chemically predeposited on the reflecting plane of an ATR Si prism. The infrared absorption for CO adlayer at the Fe film electrode measured with ATR-SEIRAS was enhanced by a factor of larger than 34, as compared to that at a Fe bulk electrode with external infrared absorption spectroscopy in the literature. More importantly, the unipolar band shape enabled the reliable determination of the Stark tuning rates of CO adlayer at Fe electrode. In situ ATR-SEIRAS was also applied to study the electrosorption of a typical corrosion inhibitor benzotriazole (BTAH) on Fe electrode as a function of potential, providing additional spectral information at positive potentials in support of the formation of a polymer-like surface complex [Fe.sup.II.sub.m][(BTA).sub.n], as the corrosion-resistant layer. 10.1021/ac1002323

Published
2010

26. Experimental Study on 28nm Chip/Package Interactions in eWLB (Embedded Wafer Level BGA) Fan-Out Wafer Level Packages

Author

Seung Wook Yoon, Seng Guan Chow, Dongkai Shangguan, Yao Jian Lin, and Won Kyung Choi

Subjects
Form factor (design), Engineering, business.industry, Ball grid array, Automotive Engineering, Electronic engineering, Fan-out, Wafer, Electronics, business, Chip, Wafer-level packaging, Embedded Wafer Level Ball Grid Array
Abstract

To meet the continued demand for form factor reduction and functional integration of electronic devices, WLP (Wafer Level Packaging) is an attractive packaging solution with many advantages in comparison with standard BGA (Ball Grid Array) packages. The advancement of fan-out WLP has made it a more promising solution as compared with fan-in WLP, because it can offer greater flexibility in enabling more IO's, multi-chips, heterogeneous integration and 3D SiP. In particular, eWLB (Embedded Wafer Level BGA) is a fan-out WLP solution which can enable applications that require higher I/O density, smaller form factor, excellent heat dissipation, and thin package profile, and it has the potential to evolve in various configurations with proven integration flexibility, process robustness, manufacturing capacity and production yield. It also facilitates integration of multiple dies vertically and horizontally in a single package without using substrates. For eWLB fan-out WLP, the structural design as well as selection of materials is very important in determining the process yield and long term reliability. Therefore it is necessary to investigate the key design factors affecting the reliability comprehensively. This work is focused on an experimental study on the chip-package interactions in eWLB fan-out WLP with multilayer RDL's. Standard JEDEC component and board level tests were carried out to investigate reliability, and both destructive and non-destructive analyses were performed to investigate potential structural defects. Warpage, die cracking and other failures were characterized through metrology measurements and electrical tests. Board assembly processes (including SMT, underfill, etc.) were also studied. The influence of materials and structural design on the package reliability will be demonstrated. Thermal characterization and thermo-mechanical simulation results will also be discussed.

Published
2016

36. Acceptorless Dehydrogenation of Alcohols Catalyzed by CuI N-Heterocycle Thiolate Complexes.

Author

Tan, Da‐Wei, Li, Hong‐Xi, Zhang, Meng‐Juan, Yao, Jian‐Lin, and Lang, Jian‐Ping

Subjects
OXIDATION of chemical alcohols, CATALYTIC dehydrogenation, COPPER clusters, THIOLATES, HETEROCYCLIC compounds, ALIPHATIC alcohols, ALLYL alcohol, BENZYL alcohol
Abstract

CuI N-heterocycle thiolate clusters efficiently catalyze the acceptorless dehydrogenation of alcohols at 70 °C. A variety of secondary/primary benzylic, allylic, and aliphatic alcohols are dehydrogenated to the corresponding ketones and aldehydes in high yields of isolated product upon release of H2. This simple catalytic system is involved in the synthesis of imines through the one-pot reaction of alcohols and amines. [ABSTRACT FROM AUTHOR]

Published
2017
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