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| 1 | SERS study on the synergistic effects of electric field enhancement and charge transfer in an Ag2S quantum dots/plasmonic bowtie nanoantenna composite system显示文摘Localized surface plasmon resonance(LSPR)of nanostructures and the interfacial charge transfer(CT)of semiconductor materials play essential roles in the study of optical and photoelectronic properties.In this paper,a composite substrate of Ag2S quantum dots(QDs)coated plasmonic Au bowtie nanoantenna(BNA)arrays with a metalinsulator-metal(MIM)configuration was built to study the synergistic effect of LSPR and interfacial CT using surface-enhanced Raman scattering(SERS)in the near-infrared(NIR)region.The Au BNA array structure with a large enhancement of the localized electric field(E-field)strongly enhanced the Raman signal of adsorbed p-aminothiophenol(PATP)probe molecules.Meanwhile,the broad enhanced spectral region was achieved owing to the coupling of LSPR The as-prepared Au BNA array structure facilitated enhancements of the excitation as well as the emission of Raman signal simultaneously,which was established by finite-difference time-domain simulation.Moreover,Ag2S semiconductor QDs were introduced into the BNA/PATP system to further enhance Raman signals,which benefited from the interfacial CT resonance in the BNA/Ag2S-QDs/PATP system.As a result,the Raman signals of PATP in the BNA/Ag2S-QDs/PATP system were strongly enhanced under 785 nm laser excitation due to the synergistic effect of E-field enhancement and interfacial CT.Furthermore,the SERS polarization dependence effeas of the BNA/Ag2S-QDs/PATP system were also investigated.The SERS spectra indicated that the polarization dependence of the substrate increased with decreasing polarization angles(θpola)of excitation from p-polarized(θpola=90°)excitation to s-polarized(θpola=0°)excitation.This study provides a strategy using the synergistic effect of interfacial CT and E-field enhancement for SERS applications and provides a guidance for the development of SERS study on semiconductor QD-based plasmonic substrates,and can be farther extended to other material-nanostructure systems for various optoelectronic and sensing applications. | BIN WANG CHEN ZHAO HUANYU LU TINGTING ZOU SUBHASH C.SINGH ZHI YU CHAONAN YAO XIN ZHENG JUN XING YUTING ZOU CUNZHU TONG WEILI YU BO ZHAO CHUNLEI GUO | 2020 | Photonics Research2020，8，4： | 1 |
| 2 | 根据Lg波Q值反演得到的Hi-CLIMB项目西藏剖面地震衰减特征显示文摘利用可靠的双台站法研究了喜马拉雅—青藏大陆岩石层造山(Hi-CLIMB)项目西藏剖面的地壳Lg波的Q值。使用沿800km长的密间距的地震剖面记录的4次M≥5.5地震提取Lg波波谱。从2369种可能的配对中挑选出107对高质量的台站间的路径,使我们能够使用标准的双台站法进行Lg波Q值的测量。通过将这107个高质量台站间的Q0(1Hz的Lg波Q)值用做输入,由反演得出衰减特征的横向变化。该地区Q0的估计值范围是从88±5到165±15,羌塘地体的值最低,喜马拉雅山脉较低区域一些地方的值最高。最低值被认为是高泊松比、更高温度以及地壳部分熔融引起的。这些结果不含有任何可检测到的Q0值变化,不论在喜马拉雅—西藏碰撞带(即印度河—雅鲁藏布江缝合带)还是在大班公—怒江缝合带(BNSZ)都是如此。沿喜马拉雅地震探测项目剖面的一致低Q0值证明整个高原的地壳普遍存在部分熔融现象。 | C.Singh M.Shekar A.Singh R.K.Chadha 张尧(译) 徐沁(校) 吕春来(复校) | 2012 | 世界地震译丛2012，43，5： | 1 |
| 3 | Laser-induced periodic surface structured electrodes with 45% energy saving in electrochemical fuel generation through field localization显示文摘Electrochemical oxidation/reduction of radicals is a green and environmentally friendly approach to generating fuels.These reactions,however,suffer from sluggish kinetics due to a low local concentration of radicals around the electrocatalyst.A large applied electrode potential can enhance the fuel generation efficiency via enhancing the radical concentration around the electrocatalyst sites,but this comes at the cost of electricity.Here,we report about a~45%saving in energy to achieve an electrochemical hydrogen generation rate of 3×10^(16) molecules cm^(–2)s^(–1)(current density:10 mA/cm^(2))through localized electric field-induced enhancement in the reagent concentration(LEFIRC)at laser-induced periodic surface structured(LIPSS)electrodes.The finite element model is used to simulate the spatial distribution of the electric field to understand the effects of LIPSS geometric parameters in field localization.When the LIPSS patterned electrodes are used as substrates to support Pt/C and RuO_(2) electrocatalysts,the η_(10) overpotentials for HER and OER are decreased by 40.4 and 25%,respectively.Moreover,the capability of the LIPSS-patterned electrodes to operate at significantly reduced energy is also demonstrated in a range of electrolytes,including alkaline,acidic,neutral,and seawater.Importantly,when two LIPSS patterned electrodes were assembled as the anode and cathode into a cell,it requires 330 mVs of lower electric potential with enhanced stability over a similar cell made of pristine electrodes to drive a current density of 10 mA/cm^(2).This work demonstrates a physical and versatile approach of electrode surface patterning to boost electrocatalytic fuel generation performance and can be applied to any metal and semiconductor catalysts for a range of electrochemical reactions. | Chaudry Sajed Saraj Subhash C.Singh Gopal Verma Rahul A Rajan Wei Li Chunlei Guo | 2022 | Opto-Electronic Advances2022，5，11： | 0 |
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