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Improvement of Raman spectrum uniformity of SERS substrate based on flat electrode

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Chinese Optics Letters 2023年第11期21卷 128-135页

作者：江志辉张申宋从喜毛红敏赵鑫陆焕钧曹召良 Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China

The distribution of metal nanoparticles on the surface of a surface enhancement raman scattering(SERS)-active substrate plays a prominent part in not only the enhancement of raman vibration signal,but also the spectrum uniformity.Here,a facile method to fabricate SERS substrates with excellent homogeneity and low cost was proposed,in which a lyotropic liquid crystal soft template was introduced for the coordinated growth of the silver nanoflowers in the process of electrochemistry deposition.Simulation was carried out to illustrate the dominated influence of the distance of electrodes on the deposited nanoparticle number.Two kinds of conductive materials,silver plate and indium tin oxide(ITO)glass,were chosen as the anode,while the cathode was fixed as ITO glass.The simulated conjecture on the effect of electrode flatness on the uniformity of deposited nanoparticles in silver is experimentally proved.More importantly,it was demonstrated that with a relatively smooth and flat ITO glass anode,a SERS substrate featuring higher spectrum uniformity could be achieved.This work is of great significance to the actual applications of the SERS substrate for quantitative detection with high sensitivity.

关键词： SERS Raman spectrum surface flatness nanoparticle distribution electrodeposition

Raman spectrum and Thermal Stability of a Newly Developed TeO_2-BaO-BaF_2-La_2O_3-LaF_3 Glass

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Journal of Materials Science & Technology 2004年第5期20卷 527-530页

作者： Junjie ZHANG, Shixun DAI, Shiqing XU, Guonian WANG, Liyan ZHANG and Lili HUShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800, China ShanghaiInstituteofOpticsandFineMechanics ChineseAcademyofSciencesP.O.Box800-211Shanghai201800China

In this work, a new TeO2-BaO-BaF2-La2O3-LaF3 oxyfluorotellurite glass system is investigated. Differential thermal analysis (DTA) and structural analysis by raman scattering spectra are reported on the glasses. The DTA results indicated that an increase of fluoride content in the glasses decreases the glass transition temperature (Tg) and increases the crystallization onset temperature (Tx). As a result the 70TeO2·20BaF2·10LaF3 glass showed a large Hruby's parameter, possessing excellent thermal stability. Changes in glass network structure with fluoride content are discussed based on the raman scattering spectra of glasses. The glass network structures in the 70TeO2·4(20-x)BaO·xBaF2·(10-y)La2O3·yaF3 glasses are basically composed of both Te(O, F)4 and Te(O, F)3 units, but the Te(O, F)4/Te(O, F)3 ratio in the glass becomes higher with increasing fluoride content. This may be considered one of the reasons why the 70TeO2·20BaF2·10LaF3 glass exhibits excellent thermal stability.

关键词： Raman spectrum Thermal stability Oxyfluorotellurite

金刚石raman光谱荧光本底及其对高压原位raman光谱测试的影响

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分析测试学报 2006年第Z1期25卷 18-19,21页

作者：谭大勇肖万生张红中国科学院广州地球化学研究所广东广州510640 中国科学院广州地球化学研究所广东广州510640 中国科学院广州地球化学研究所广东广州510640

　　金刚石对顶砧(diamond anvil cell,DAC)装置(如图1所示)是目前产生压力最高的静态高压实验装置,它以金刚石单晶作对顶砧单轴挤压样品产生高压,由于金刚石在很宽的能量范围对光子(可见光、高能X射线等)透明,在高压实验中可以通过显... 详细信息

　　金刚石对顶砧(diamond anvil cell,DAC)装置(如图1所示)是目前产生压力最高的静态高压实验装置,它以金刚石单晶作对顶砧单轴挤压样品产生高压,由于金刚石在很宽的能量范围对光子(可见光、高能X射线等)透明,在高压实验中可以通过显微镜观察样品,并可对样品进行高压原位X射线衍射和光谱(红外光谱、raman光谱等)测试,这一特点使其在高压科学领域得到广泛的应用.在高压原位raman光谱测试中,激发光源透过金刚石对顶砧照射到样品上产生raman信号,样品的raman信号穿过金刚石对顶砧经显微镜物镜收集并最终被探测器接收.与常规的raman光谱测试相比,基于DAC装置的高压原位raman光谱测试光路中多出了金刚石对顶砧,需要采用长焦物镜收集信号,并且随着实验压力的升高,样品的raman信号强度降低,因此提高信噪比是获得较高质量高压原位raman光谱的关键,而金刚石对顶砧的荧光本底是影响信噪比的关键因素.本文通过对20多颗金刚石对顶砧进行raman光谱测试,对金刚石的raman光谱信号(一级和二级)和非随机噪声进行了系统的评估,并结合高压原位raman光谱测试的具体特点,探讨金刚石对顶砧荧光本底对测试结果的影响.……

关键词：金刚石对顶砧光谱测试荧光高压实验原位 Raman spectrum 样品光谱信号实验装置高信噪比显微镜物镜显微镜观察金刚石单晶压力随机噪声收集射线衍射强度降低能量范围科学领域

Decoding of raman spectroscopy-encoded suspension arrays based on the detail constraint cycle domain adaptive model

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Journal of Innovative Optical Health Sciences 2022年第4期15卷 116-127页

作者： Yu Yao Kaiwen Xue Liwang Liu Shanshan Zhu Chengfeng Yue Yanhong Ji School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 GuangdongP.R.China

Previous studies have already shown that raman spectroscopy can be used in the encoding of suspension array technology.However,almost all existing convolutional neural network-based decoding approaches rely on supervision with ground truth,and may not be well generalized to unseen datasets,which were collected under different experimental conditions,applying with the same coded material.In this study,we propose an improved model based on CyCADA,named as Detail constraint Cycle Domain Adaptive Model(DCDA).DCDA implements the clasification of unseen datasets through domain adaptation,adapts representations at the encode level with decoder-share,and enforces coding features while leveraging a feat loss.To improve detailed structural constraints,DCDA takes downsample connection and skips connection.Our model improves the poor generalization of existing models and saves the cost of the labeling process for unseen target datasets.Compared with other models,extensive experiments and ablation studies show the superiority of DCDA in terms of classification stability and generalization.The model proposed by the research achieves a classification with an accuracy of 100%when applied in datasets,in which the spectrum in the source domain is far less than the target domain.

关键词： Domain adaption suspension arrays deep learning Raman spectrum generalization.

The development and application of dual-comb spectroscopy in analytical chemistry

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Chinese Chemical Letters 2023年第1期34卷 39-44页

作者： Ziheng Wei Xinyi Ren Ming Yan Hulie Zeng Department of Pharmaceutical Analysis School of PharmacyFudan UniversityShanghai 201203China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

Analytical chemistry plays an important role in the qualitive and quantitative analysis for molecules in the various circumstances,especially for the high-resolution analysis.The dual-comb spectroscopy(DCS)technology with the characteristics of high resolution,high sensitivity and instantaneous sampling exhibited a great potential in high-resolution in-situ spectral methods and has been active in the fields of spatial ranging,air composition analysis,reaction monitoring and so on.In this review,we will summarize the principle of DCS according to the different wavelength coverage and overview the applications of DCS in analytical chemistry.

关键词： Dual-comb spectroscopy Infrared spectrum Raman spectrum Spectral analysis Gas detection

Stacking driven raman spectra change of carbon based 2D semiconductor C_(3)N

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Chinese Chemical Letters 2022年第5期33卷 2600-2604页

作者： Yucheng Yang Wenya Wei Peng He Siwei Yang Qinghong Yuan Guqiao Ding Zhi Liu Xiaoming Xie School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceKey Laboratory of Polar Materials and Devices(MOE)East China Normal UniversityShanghai 200241China

As a two-dimensional carbon based semiconductor,C_(3)N acts as a promising material in many application areas.However,the basic physical properties such as Raman spectrum properties of C_(3)N is still not clear.In this paper,we clarify the Raman spectrum properties of multilayer C_(3)N.Moreover,the stacking driven raman spectra change of multilayer C_(3)N is also discussed.

关键词： C_(3)N Raman spectrum Carbon based semiconductor 2D materials Stacking structure

Influence of Re-ions with different ionic radius in Ba_(12)ReNb_(9)O_(36) on crystal structure and microwave dielectric properties

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Journal of Materiomics 2022年第1期8卷 104-112页

作者： Pengcheng Zhang Hao Li Xiaoqing Chen Xing Zhang Hongcheng Yang Canbing Li Shuren Zhang College of Electrical and Information Engineering Hunan UniversityChangsha410082China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China National Engineering Research Center of Electromagnetic Radiation Control Materials University of Electronic Science and Technology of ChinaChengdu610054China

The Ba_(12)ReNb_(9)O_(36)(Re=Yb,Ce,Tm,Er,Y,Ho,Dy,Gd)ceramics are synthesized by solid-phase reaction method.The phase composition,crystal structure,microstructure,and microwave dielectric properties of the ceramics are investigated by X-ray diffraction,X-ray photoelectron spectroscopy,Scanning electron microscopy and Raman spectrum.The optimal microwave dielectric properties(ε_(r)=37.23,Q×f=36600 GHz,andτ_(f)=34 ppm/℃)are obtained for Ba_(12)YbNb_(9)O_(36) ceramic sintered at 1420℃for 6 h.In this system,the variation of dielectric constant is dominated by polarizability.The Q×f is mainly affected by internal strain/fluctuation of d-spacing.The variation of τ_(f) is related to the temperature coefficient of dielectric constant and the oxygen octahedron distortion.Furthermore,the reduction of Ce^(4+) ions,the relative density,linear thermal expansion coefficient,and the second phase are also important factors affecting microwave dielectric properties.

关键词： Microwave dielectric ceramic Ba_(12)ReNb_(9)O_(36) Polarizability Raman spectrum

raman Scattering spectrum Analysis of GaP and Its luminous Materials

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Semiconductor Photonics and Technology 1997年第1期3卷 7-13页

作者： ZHANG Fujia, ZHANG Dejiang, SHAO Jiafeng(Lanzhou University, Lanzhou 730000, CHN)QI Li, GAN Run jin(Beijing Mechanical lndustry Institute, Beijing 100083, CHN)

Abstract: The raman scattering spectra of n- type GaP(doped S) single crystal and red and green luminous materials grown on the n - type GaP (doped S) single crys-tal substrate by liquid - phase epitaxy are analyed. The results show that the spectra of GaP single crystal and its luminous materials include not only the first - order longitudi-nal optical photons and transverse optical phonons raman scattering peaks, but also the peaks of the bound excitons, bound electrons and bound holes.

关键词： LPE Luminescence Raman spectrum Semiconductor Materials

The application of label-free imaging technologies in transdermal research for deeper mechanism revealing

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Asian Journal of Pharmaceutical Sciences 2021年第3期16卷 265-279页

作者： Danping Zhang Qiong Bian Yi Zhou Qiaoling Huang Jianqing Gao Institute of Pharmaceutics College of Pharmaceutical SciencesZhejiang UniversityHangzhou 310058China The Third People’s Hospital of Hangzhou Hangzhou 310012China Jiangsu Engineering Research Center for New-Type External and Transdermal Preparations Changzhou 213000China

The penetration behavior of topical substances in the skin not only relates to the transdermal delivery efficiency but also involves the safety and therapeutic effect of topical products,such as sunscreen and hair growth products.Researchers have tried to illustrate the transdermal process with diversified theories and technologies.Directly observing the distribution of topical substances on skin by characteristic imaging is the most convincing approach.Unfortunately,fluorescence labeling imaging,which is commonly used in biochemical research,is limited for transdermal research for most topical substances with a molecular mass less than 500 Da.Label-free imaging technologies possess the advantages of not requiring any macromolecular dyes,no tissue destruction and an extensive substance detection capability,which has enabled rapid development of such technologies in recent years and their introduction to biological tissue analysis,such as skin samples.Through the specific identification of topical substances and endogenous tissue components,label-free imaging technologies can provide abundant tissue distribution information,enrich theoretical and practical guidance for transdermal drug delivery systems.In this review,we expound the mechanisms and applications of the most popular label-free imaging technologies in transdermal research at present,compare their advantages and disadvantages,and forecast development prospects.

关键词： Infrared spectroscopy Raman spectrum Mass spectrometry Label-free imaging technology Mechanism research