International Journal of Spectroscopy最新文献_第4页

Design of Novel Metal Nanostructures for Broadband Solar Energy Conversion 用于宽带太阳能转换的新型金属纳米结构设计

International Journal of Spectroscopy Pub Date : 2015-02-03 DOI: 10.1155/2015/147423

K. A. Zhang, D. Ma, Ying-Chih Pu, Yat Li

{"title":"Design of Novel Metal Nanostructures for Broadband Solar Energy Conversion","authors":"K. A. Zhang, D. Ma, Ying-Chih Pu, Yat Li","doi":"10.1155/2015/147423","DOIUrl":"https://doi.org/10.1155/2015/147423","url":null,"abstract":"Solar power holds great potential as an alternative energy source, but current photovoltaic cells have much room for improvement in cost and efficiency. Our objective was to develop metal nanostructures whose surface plasmon resonance (SPR) spectra closely match the solar spectrum to enhance light absorption and scattering. We employed the finite-difference time-domain simulation method to evaluate the effect of varying key parameters. A novel nanostructure with SPR absorption matching a region of the solar spectrum (300 to 1500 nm) that contains 90% of solar energy was successfully designed. This structure consists of a large gold-silica core-shell structure with smaller gold nanoparticles and nanorods on its surface. Such complex nanostructures are promising for broad and tunable absorption spectra. In addition, we investigated the SPR of silver nanoparticle arrays, which can achieve scattering close to the solar spectrum. We demonstrated an improvement in efficiency of over 30% with optimal nanoparticle radius and periods of 75 nm and 325 nm, respectively. In combination, our studies enable high-efficiency, tunable, and cost-effective enhancement of both light absorption and scattering, which has potential applications in solar energy conversion as well as biomedical imaging.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"43 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82365937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Moderate UVC Irradiation on Bovine Serum Albumin and Complex with Antimetabolite 5-Fluorouracil: Fluorescence Spectroscopic and Molecular Modelling Studies 中等紫外线照射对牛血清白蛋白及其与抗代谢物5-氟尿嘧啶复合物的影响:荧光光谱和分子模拟研究

International Journal of Spectroscopy Pub Date : 2015-01-31 DOI: 10.1155/2015/315764

Shanmugavel Chinnathambi, Shanmugavel Chinnathambi, S. Karthikeyan, D. Velmurugan, N. Hanagata, N. Hanagata, P. Aruna, S. Ganesan

引用次数: 11

Spectral Properties of Dyes with Interfragmental Charge Transfer: Solvatochromism and Solvatofluorochromism of 2-(3-Coumaroyl)-benzopyrylium Perchlorates 片段间电荷转移染料的光谱性质:2-(3-香豆醇基)-高氯酸苯并吡啶的溶剂变色和溶剂荧光变色

International Journal of Spectroscopy Pub Date : 2014-12-23 DOI: 10.1155/2014/508153

E. V. Sanin, A. I. Novikov, A. Roshal

{"title":"Spectral Properties of Dyes with Interfragmental Charge Transfer: Solvatochromism and Solvatofluorochromism of 2-(3-Coumaroyl)-benzopyrylium Perchlorates","authors":"E. V. Sanin, A. I. Novikov, A. Roshal","doi":"10.1155/2014/508153","DOIUrl":"https://doi.org/10.1155/2014/508153","url":null,"abstract":"The paper deals with the spectral properties of dyes with interfragmental charge transfer, in particular, derivatives of 2-(3-coumaroyl)benzopyrylium (CBP) perchlorates. The positions of long-wavelength absorption and emission bands, quantum yields, and lifetimes of fluorescence were measured, mostly in aprotic solvents. Regression analysis of the relationship between the spectral characteristics of CBP and the main solvent parameters (polarity, polarisability, nucleophilicity, and electrophilicity) was carried out. \u0000It was found that the characteristics of CBP depend mainly on two solvent parameters—polarity and/or nucleophilicity. An increase in these parameters results in a hypsochromic shift of absorption bands and a decrease of lifetimes and fluorescence intensity. The positions of the emission bands can demonstrate either hypsochromism or bathochromism, depending on the nature of the substituents. The solvatofluorochromic effects are not as strong as the solvatochromic ones. We believe that the spectral behaviour of CBP can be explained by cation depolarisation and by a decrease in the stability of nucleophilic complexes with solvent molecules that is associated with interfragmental charge transfer following excitation, relaxation, and radiative deactivation of the excited state.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"1 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90209829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Graphical Conversion between Compliance and Modulus, Permittivity and Electric Modulus, and Impedance and Admittance 柔度和模量、介电常数和电模量、阻抗和导纳之间的图形转换

International Journal of Spectroscopy Pub Date : 2014-11-25 DOI: 10.1155/2014/538206

M. Nakanishi

引用次数: 6

Optical Path Length Calibration: A Standard Approach for Use in Absorption Cell-Based IR-Spectrometric Gas Analysis 光程长度校准:一种用于基于吸收池的红外光谱气体分析的标准方法

International Journal of Spectroscopy Pub Date : 2014-07-17 DOI: 10.1155/2014/132607

J. Nwaboh, O. Witzel, A. Pogány, O. Werhahn, V. Ebert

{"title":"Optical Path Length Calibration: A Standard Approach for Use in Absorption Cell-Based IR-Spectrometric Gas Analysis","authors":"J. Nwaboh, O. Witzel, A. Pogány, O. Werhahn, V. Ebert","doi":"10.1155/2014/132607","DOIUrl":"https://doi.org/10.1155/2014/132607","url":null,"abstract":"We employed a comparison method to determine the optical path length of gas cells which can be used in spectroscopic setup based on laser absorption spectroscopy or FTIR. The method is based on absorption spectroscopy itself. A reference gas cell, whose length is ap rioriknown and desirably traceable to the international system of units (SI), and a gas mixture are used to calibrate the path length of a cell under test. By comparing spectra derived from pressure-dependent measurements on the two cells, the path length of the gas cell under test is determined. The method relies neither on the knowledge of the gas concentration nor on the line strength parameter of the probed transition which is very rarely traceable to the SI and of which the uncertainty is often relatively large. The method is flexible such that any infrared light source and infrared active molecule with isolated lines can be used. We elaborate on the method, substantiate the method by reporting results of this calibration procedure applied to multipass and single pass gas cells of lengths from 0.38 m to 21 m, and compare this to other methods. The relative combined uncertainty of the path length results determined using the comparison method was found to be in the ±0.4% range.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"19 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84450965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Uniform versus Nonuniform Scaling of Normal Modes Predicted by Ab Initio Calculations: A Test on 2-(2,6-Dichlorophenyl)-N-(1,3-thiazol-2yl) Acetamide 用从头计算预测正态模式的均匀与非均匀标度:对2-(2,6-二氯苯基)- n -(1,3-噻唑-2基)乙酰胺的测试

International Journal of Spectroscopy Pub Date : 2014-07-10 DOI: 10.1155/2014/649268

A. K. Srivastava, A. K. Pandey, S. Pandey, P. Nayak, B. Narayana, B. Sarojini, N. Misra

引用次数: 2

Quantum Chemical and Spectroscopic Investigations of (Ethyl 4 hydroxy-3-((E)-(pyren-1-ylimino)methyl)benzoate) by DFT Method DFT法研究(4 -羟基-3-((E)-(芘-1-苯甲酸)甲基苯甲酸酯)的量子化学和光谱

International Journal of Spectroscopy Pub Date : 2014-07-09 DOI: 10.1155/2014/841593

Diwaker, A. Gupta

引用次数: 8

New Kinetic Spectrophotometric Method for Determination of Fexofenadine Hydrochloride in Pharmaceutical Formulations 动力学分光光度法测定制剂中盐酸非索非那定的含量

International Journal of Spectroscopy Pub Date : 2014-06-29 DOI: 10.1155/2014/308087

S. Ashour, Mouhammed Khateeb

引用次数: 7

Binding of the Bi (III) Complex of Naringin with β-Cyclodextrin/Calf Thymus DNA: Absorption and Fluorescence Characteristics 柚皮苷Bi (III)配合物与β-环糊精/小牛胸腺DNA的结合:吸收和荧光特性

International Journal of Spectroscopy Pub Date : 2014-06-05 DOI: 10.1155/2014/562160

Sameena Yousuf, I. V. Enoch

引用次数: 1

Understanding and Control of High Temperature Oxidation Flaws of Low-Density Poly(ethylene) with Raman Spectroscopy 拉曼光谱对低密度聚乙烯高温氧化缺陷的认识与控制

International Journal of Spectroscopy Pub Date : 2014-06-05 DOI: 10.1155/2014/194563

M. Veitmann, R. Jumeau, P. Bourson, M. Ferriol, F. Lahure

{"title":"Understanding and Control of High Temperature Oxidation Flaws of Low-Density Poly(ethylene) with Raman Spectroscopy","authors":"M. Veitmann, R. Jumeau, P. Bourson, M. Ferriol, F. Lahure","doi":"10.1155/2014/194563","DOIUrl":"https://doi.org/10.1155/2014/194563","url":null,"abstract":"Studies of high temperature oxidation of polyethylene are not much present in the literature though it can really be a problem especially in polymer production and processing. This study aims to detect oxidation flaws in polyethylene and to determine their impact on polymer structure and properties. Besides, we suggest a method via PLS-regression to determine the degree of flaws that can occur during polymer processing due to oxidation. Several kinds of oxidation flaws were reproduced in laboratory at 150°C in an oven operating in air and Raman spectroscopy analysis was performed on each sample. Using statistical tools as chemometrics on these spectra, we have built a Partial Least Square (PLS) model able to predict the oxidation degree of flaws. Interpretation of the model construction and further characterization tests show that oxidation can be followed with the evolution of the crystalline carbon group and of the created carbonyl functions. Finally we suggest possible mechanisms which can explain the high temperature oxidation process in LPDE, and we link them to the modification of the material properties.","PeriodicalId":14329,"journal":{"name":"International Journal of Spectroscopy","volume":"51 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89467569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5