Crystal Research and Technology最新文献_第8页

Reduction of Humidity Effect in WO3 Thin Film‐Based NO2 Sensor Using Physiochemical Optimization 利用物理化学优化降低WO3薄膜NO2传感器的湿度效应

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-27 DOI: 10.1002/crat.202000155

S. Ghosh, Murugaiya Sridar Ilango, C. Prajapati, N. Bhat

引用次数: 3

Facile Synthesis of Vertically Aligned MoS2 Nanosheets at Ambient Pressure 常压下垂直排列二硫化钼纳米片的简易合成

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-26 DOI: 10.1002/crat.202000085

C. Borah, Sanjeev Kumar

{"title":"Facile Synthesis of Vertically Aligned MoS2 Nanosheets at Ambient Pressure","authors":"C. Borah, Sanjeev Kumar","doi":"10.1002/crat.202000085","DOIUrl":"https://doi.org/10.1002/crat.202000085","url":null,"abstract":"Vertically aligned 2D molybdenum disulfide (MoS2) nanosheets are grown directly on SiO2/Si substrate using an ordinary tubular furnace under 850 °C temperature and atmospheric pressure condition. To achieve high‐quality vertically aligned 2D MoS2, the amount of precursor material, i.e., molybdenum trioxide (MoO3) powder and sulfur (S), is varied, keeping the other parameters such as temperature and carrier gas flow rate constant. The Raman spectroscopy confirms the formation of 2D MoS2 layers and it illustrates that as‐grown MoS2 is in few‐layer forms with good crystallinity. The Raman spectra identifies the best quality 2D MoS2. The topographical and morphological studies of MoS2 carried out by atomic force microscope (AFM) and field effect scanning microscope (FESEM) reveal that as‐synthesized MoS2 is vertically aligned. X‐ray diffraction and energy dispersive spectroscopy (EDS) are carried out in order to identify the phase and elements in the product. In the present work, the emphasis is given on the vertical alignment rather than the thickness of 2D MoS2. Finally, it is demonstrated that vertically aligned 2D MoS2 can be grown simply on SiO2/Si substrate using a simple ordinary tubular furnace under atmospheric pressure condition by varying the amount of MoO3 and S.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"21 6 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83155691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal 掺铈氯化钾单晶的发光性能和力学性能

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-16 DOI: 10.1002/crat.202000060

Yongtao Li, Yongju Li, Chun Li, Xuejian Zhang, F. Zeng, Hailing Lin, Zhongmin Su, C. Mahadevan

{"title":"Luminescent and Mechanical Properties of Cerium Doped Potassium Chloride Single Crystal","authors":"Yongtao Li, Yongju Li, Chun Li, Xuejian Zhang, F. Zeng, Hailing Lin, Zhongmin Su, C. Mahadevan","doi":"10.1002/crat.202000060","DOIUrl":"https://doi.org/10.1002/crat.202000060","url":null,"abstract":"Large size cerium (Ce3+)‐doped potassium chloride single crystal is grown by the resistance heating Czochralski method and characterized structurally, mechanically, and optically by carrying out X‐ray diffraction (XRD), micro‐hardness, photoluminescence (PL), PL excitation (PLE), thermo‐luminescence (TL), and decay time measurements. XRD measurements reveal the incorporation of Ce atoms into the KCl host lattice. Microhardness measurements indicate an improvement in the hardness due to Ce3+‐doping and a decrease of hardness with increasing temperature. Two intense PL emission peaks are observed at wavelengths 343 and 367 nm, attributed, respectively, to the 5d→2F5/2 and 5d→2F7/2 transitions of Ce3+. Energy level scheme for the Ce3+ ion in the KCl crystal is proposed through PL and PLE analyses. The observed TL glow curve of KCl:Ce3+ shows a sharp peak located at about 244 °C. XRD, PL, and TL studies confirm the trivalent state of Ce3+ ion in the KCl host lattice. The luminescence decay time of KCl:Ce3+ crystal is found to be 35.14 ± 0.17 ns. The present study indicates that the KCl:Ce3+ crystal grown exhibiting suitable PL and TL emissions is expected to be a potential material for radiation dosimetry and scintillation applications.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"162 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88920101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

A Simple Synthesis Method for Growing Single Crystals of a Copper Coordination Polymer [Cu(C2O4)(4‐aminopyridine)2(H2O)]n, and its Theoretical and Physical Properties Studies 铜配位聚合物[Cu(C2O4)(4‐氨基吡啶)2(H2O)]n单晶的简单合成方法及其理论和物理性质研究

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-11 DOI: 10.1002/crat.202000124

George Mathew, S. Francis, Neeraj K Rajak, S. Praveen, C. V. Tomy, D. Jaiswal-Nagar

{"title":"A Simple Synthesis Method for Growing Single Crystals of a Copper Coordination Polymer [Cu(C2O4)(4‐aminopyridine)2(H2O)]n, and its Theoretical and Physical Properties Studies","authors":"George Mathew, S. Francis, Neeraj K Rajak, S. Praveen, C. V. Tomy, D. Jaiswal-Nagar","doi":"10.1002/crat.202000124","DOIUrl":"https://doi.org/10.1002/crat.202000124","url":null,"abstract":"This work reports on a novel and simple synthetic route for the growth of metal–organic crystal [Cu(C2O4)(4‐aminopyridine)2(H2O)]n of large size using the technique of liquid–liquid diffusion or layer diffusion. Single‐crystal X‐ray diffraction measurements revealed a very good quality of the grown single crystals with a small value 1.101 of goodness‐of‐fit R. Rietveld refinement done on powder X‐ray diffractogram obtained on few single crystals crushed together revealed a very small value of R as 3.45, indicating very good crystal quality in a batch of crystals. Density functional theory with three different basis sets generated the optimized geometry of a monomeric unit as well as its vibrational spectra. Comparison between experimentally obtained bond lengths, bond angles, IR frequencies, etc. suggests (B3LYP/LanL2DZ, B3LYP/6‐311++ G(d,p) basis set to describe the properties the best. Magnetic susceptibility measurements confirm the metal–organic crystal [Cu(C2O4)(4‐aminopyridine)2(H2O)]n to be a very good representation of a spin 1/2 Heisenberg antiferromagnet.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"8 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82892189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Comments on the Paper: “Synthesis, Growth and Optical, Mechanical, Electrical and Surface Properties of an Inorganic New Nonlinear Optical Crystal: Sodium Cadmium Tetra Chloride (SCTC)” 对“无机新型非线性光学晶体四氯化镉钠(SCTC)的合成、生长及其光学、机械、电学和表面性能”一文的评论

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-06 DOI: 10.1002/crat.202000097

B. R. Srinivasan

引用次数: 0

Numerical Modeling of Heat Transfer and Thermal Stress at the Czochralski Growth of Neodymium Scandate Single Crystals 氧化钕单晶生长过程中传热和热应力的数值模拟

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-05 DOI: 10.1002/crat.202000106

K. Böttcher, W. Miller, S. Ganschow

引用次数: 2

Radiation Sensors: Growth and Characterization of Radiation Sensors Based on Single Crystals of Hybrid Metal–Organic Methylammonium Lead Bromide and Iodide Perovskite (Crystal Research and Technology 11/2020) 辐射传感器:基于杂化金属-有机甲基铵-溴化铅-碘化钙钛矿单晶的辐射传感器的生长与表征(晶体研究与技术11/2020)

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-01 DOI: 10.1002/crat.202070031

引用次数: 0

Masthead: Crystal Research and Technology 11'2020 报头:晶体研究与技术11'2020

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-11-01 DOI: 10.1002/crat.202070032

引用次数: 0

The Transformation Relationship between Two Hydrates of Calcium Dobesilate and its Application in Crystallization Process 多贝酸钙两种水合物的转化关系及其在结晶过程中的应用

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-10-12 DOI: 10.1002/crat.202000139

X. Yao, Yanfang Wu, Shujia Sun, F. Ren, Shunping Yang, Yan Liu

{"title":"The Transformation Relationship between Two Hydrates of Calcium Dobesilate and its Application in Crystallization Process","authors":"X. Yao, Yanfang Wu, Shujia Sun, F. Ren, Shunping Yang, Yan Liu","doi":"10.1002/crat.202000139","DOIUrl":"https://doi.org/10.1002/crat.202000139","url":null,"abstract":"As a classic drug with several hydrate forms, Calcium Dobesilate is widely used in the treatment of diabetic retinopathy and chronic venous insufficiency, and Monohydrate is the medicinal form. The key impurity, hydroquinone, is an important synthetic raw material of Calcium Dobesilate, but has a potential genotoxicity, so the content of hydroquinone in the final product should be lower. In this paper, based on characterization results of different hydrates, the Dihydrate is found as the beneficial form for purification, thus a novel crystallization process for purification has been carried out. The Dihydrate is obtained by a recrystallization and then transformed into the Monohydrate. From the results of solid‐state characterization and process analysis of phase transformation, the transformation relationship between the two hydrates is determined, and it is found out that the transformation from Dihydrate to Monohydrate could only happen via solution‐mediated transformation in Ethanol or Isopropanol. The impurity content of the Monohydrate product prepared by the new crystallization process is far below the current standard in the Pharmacopoeia.","PeriodicalId":10797,"journal":{"name":"Crystal Research and Technology","volume":"55 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2020-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87261981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Urate Crystals: Morphology Regulation of Monosodium Urate Monohydrate Crystals via Fabricated Uniform Hydrogel Slices (Crystal Research and Technology 10/2020) 尿酸盐晶体:制备均匀水凝胶片对一水尿酸钠晶体形态的调控(晶体研究与技术10/2020)

IF 1.5 4区材料科学

Crystal Research and Technology Pub Date : 2020-10-01 DOI: 10.1002/crat.202070029

引用次数: 0