检索结果-南通市图书馆

Flux blended synth.sis of novel Y2O3：Eu^3＋ sensing arrays for h.gh.y sensitive dual mode detection of LFPs on versatile surfaces

引用

Journal of Rare Earth. 2018年第9期36卷 954-964页

作者： K.N. Venkatach.laiah.h. nagabhushana R.B. Basavaj G.R Darsh.n B. Daruka Prasad S.C. Sh.rma Department of Ph.sics Amrito School of Engineering Amrito Vishwa Vidyapeethom Amrita University Bengoluru 560035 India Research.and Development Center Bharathiar University Coimbatore 641046 India Prof. C.N.R. Rao Centre for Advanced Material Science Tumakuru University Tumakuru 572103 India Department of Ph.sics Acharya Institute of Graduate Studies Bangalore 560107 India Department of Ph.sics B.M.S. Institute of Technology and Management Visveswaraya Technological University affiliated Bangalore 560064 India h.norary Professor Department of Mechanical Engineering Jain University Advisor Jain Croup of Institutions Bangalore 560069 India

In th. present communication,various fluxes blended Y2 O3：Eu3＋（5 mol%） nanopowders（NPs） were successfully fabricated by solution combustion *** pattern confirms body-centered cubic structure of th. prepared *** band gap（Eg） of th. fabricated products was estimated and is found to be in th. range of 3.13-3.32 ***（PL） emission spectra exh.bit sh.rp and intense peaks at ～579,592,614,657,704 nm corresponding to 5 D0→7 FJ（J = 0,1,2,3 and 4） transitions of Eu3＋ *** of fluxes for enh.ncing th. PL emissions was extensively *** studies of th. prepared samples are located in pure red *** NPs were explored as a novel sensing agent for visualization of latent fingerprints（LFPs） on various surfaces including porous,semiporous and non-porous surfaces followed by powder dusting *** experiments including aging,temperature,scratch.ng and aquatic fresh.water treatment tests were performed to evaluate applicability of th. fabricated *** LFPs exh.bit well defined ridge details including most auth.nticated sweat pores are also revealed with.h.gh.sensitivity,selectivity,little background h.ndrance and less *** results evidence th.t th. meth.d and fabricated NPs can be considered to be simple,rapid and economical and provide novel sensing platform for LFPs visualization in prospective forensic applications.

关键词： Fluxes Ph.toluminescence Latent fingerprint Sweat pores Forensic applications Rare earth.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Exploring one material for dual applications:A red-emitting Mg2GeO4:Eu3+ nanoph.sph.r for future generation energy efficient WLEDs and dosimetric applications

引用

Journal of Rare Earth. 2024年第10期42卷 1835-1845页

作者： Aksh.y Arjun G.P.Darsh.n S.C.Sh.rma h.nagabhushana D.V.Sunith. h.B.Premkumar Department of Ph.sics Faculty of Mathematical and Physical SciencesM.S.Ramaiah University of Applied Sciences Jain University C.N.R.Rao Centre for Advanced Materials Tumkur University Sch.ol of Applied Sciences (Ph.sics) REVA University

Th. envisaged design and developme nt of individual mate rials to excavate a broader spectrum of desired properties and offer multiple applications are h.gh.y *** th.s in mind,a series of forsterite-structured Mg2GeO4:Eu3+（1 mol%-9 mol%） nanoph.sph.rs was synth.sized via a solution combustion meth.d using oxalyl dih.drazide as a *** X-ray diffraction patterns confirm th. orth.rh.mbic crystal system with.a Puma space *** results clearly sh.w irregularly sh.ped cluster-like structures with.aggregation of th. *** diffuse reflectance spectra,th. optical energy band gap of th. Mg2GeO4:Eu3+（1 mol%-9 mol%） nanoph.sph.rs was estimated and obtained to be～4.12-4.32 *** ph.toluminescence emission spectra exh.bit intense peaks at ～579,589,610,661,and 707 nm,wh.ch.are due to ch.racteristic5D0→7F0,5D0→7F1,5Do→7F2,5D0→7F3and5D0→7F4transitions of Eu3+ions,*** Commission International de L'Eclairage color coordinates are gradually tuned from pale red（0.5980,0.4012） to a pure red（0.6385,0.3611） *** glow peaks sh.wcase excellent super-linear response at low doses of γ-irradiations,indicating th.t th. prepared ph.sph.r can be used in th.rmoluminescent personal dosimetry wh.ch.is a biological tissue *** aforementioned results demonstrate th.t th. prepared Mg2GeO4:Eu3+（1 mol%-9 mol%） nanoph.sph.rs are considered an excellent candidate for dual applications,i.e.,red component in future generation wh.te-ligh.-emitting diodes（WLEDs） and personal dosimetric applications.

关键词： Dosimetry Nanoph.sph.rs Ph.toluminescence Ph.tometric properties Rare earth. Th.rmoluminescence

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Enh.ncement of luminescence intensity and spectroscopic analysis of Eu^(3+) activated and Li^+ ch.rge-compensated Bi_2O_3 nanoph.sph.rs for solid-state ligh.ing

引用

Journal of Rare Earth. 2019年第4期37卷 356-364页

作者： S.Ash.ini S.C.Prash.nth. Ramach.NDra Naik h.nagabhushana Department of Ph.sics Channabasaveshwara Institute of Technology Research.Center Department of Science East West Institute of Technology Department of Ph.sics New Horizon College of Engineering CNR Rao Center for Advanced Materials Tumkur University

Th. present work reports th. synth.sis, ch.racterization, ph.toluminescence and ph.tocatalytic activity of Eu^(3+)(1 mol%-11 mol%) doped and Li^+(0.5 mol%-5 mol%) co-doped Bi_2 O_3 nanoph.sph.rs(NPs) by sonoch.mical meth.d. Th. average particle size was estimated using powder X-ray diffraction(PXRD)and transmission electron microscopy(TEM) and is found to be in th. range of 30-35 nm. Th. scanning electron microscopy(SEM) images were h.gh.y dependent on sonication time and concentration of epigallocatech.n gallate(EGCG) bio-surfactant. Th. energy gap of doped and co-doped Bi_2 O_3 nanoph.sph.rs was estimated using Kubelka-Munk(K-M) function and is found to be in th. range of2.9-3.08 eV. Th. effect of Li+ co-doping on luminescence of optimized Bi_2 O_3:Eu^(3+) was studied and is found about more th.n 3 fold enh.ncement of emission intensity. Judd-Ofelt parameters(Ω_2, Ω_4 and Ω_6).transition probabilities(A_T), quantum efficiency(η), luminescence lifetime(τ_(rad)), color ch.omaticity coordinates(CIE) and correlated color temperature(CCT) values were estimated from th. emission spectra and are discussed in detail. Th. estimated CIE ch.omaticity co-ordinates are very close to th. NTSC(National Television Standard Committee) standard value of red emission. Th. synth.sized NPs sh.w excellent ph.tocatalytic activity of acid red-88 under UV-ligh. irradiation, wh.ch.can degrade 98.1% in60 min. Th. decreasing electron-h.le pair recombination rate with.quick electron transfer ability is predominantly ascribed to th. balance between crystallite size, morph.logy, band gap, defects, surface area, etc. Th.se results sh.w a ligh. for th. use of sonoch.mical route of Bi_2 O_3:Eu^(3+):Li^+ in solid state display and ph.tocatalytic applications.

关键词： Bi2O3:Eu3+:Li+ Sonoch.mical Ph.toluminescence CIE n CCT Ph.tocatalysis Rare earth.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative study of Eu^(3+)-activated LnOCl(Ln=La and Gd) ph.sph.rs and th.ir Judd-Ofelt analysis

引用

Journal of Rare Earth. 2015年第9期33卷 946-953页

作者： N.Dh.nanjaya C.Sh.vakumara Roh.t Saraf Sukanti Beh.ra h.nagabhushana Department of Ph.sics B.M.S. Institute of Technology and Management Solid State and Structural Ch.mistry Unit Indian Institute of Science C. N. R. Rao Center for Advanced Materials Tumkur University

Eu3＋-activated layered LnOCI （Ln=La and Gd） ph.sph.rs were synth.sized by th. conventional solid-state meth.d at relatively low temperature （700 ℃） and sh.rter duration of 2 h. Th. structural parameters were refined by th. Rietveld refinement analysis and confirmed by th. h.gh.resolution transmission electron microscopy （h.TEM）. Both.th. compounds were crystallized in th. tetragonal structure with.space group P4/nmm （No. 129）. Th. h.mogeneity of th. elements were ana- lyzed by TEM mapping and found to be uniformly distributed. Th. ph.toluminescence spectra revealed th.t th. intensity of 5D0--7F2 transition （619 nm） was more intense in Eu3＋-activated GdOC1 compared to LaOC1. Th.s was due to th. property of Gd3＋ ions to act as an intermediate sublattice to facilitate th. energy transfer to Eu3＋ ions. Intensity parameters and radiative properties such.as transition probabilities, radiative lifetime and branch.ng ratio were calculated using th. Judd-Ofelt th.ory. Th. CIE color coordinates result revealed th.t th. Eu3＋-activated GdOC1 （0.641, 0.354） ph.sph.r was close to th. commercial red ph.sph.rs like, Y203：Eu3＋（0.645, 0.347）, Y202S：Eu3＋（0.647, 0.343） and National Television System Committee （NTSC）（0.67, 0.33）. Th. results suggest th.t th. present GdOCI：Eu3＋ compound acts as a potential candidate for red ph.sph.r materials.

关键词： LaOC1 GdOC1 ph.sph.rs Judd-Ofelt CIE rare earth.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rauvolfia serpentina-Mediated Green Synth.sis of CuO Nanoparticles and Its Multidisciplinary Studies

引用

Acta Metallurgica Sinica(English.Letters) 2015年第9期28卷 1134-1140页

作者： K.Lingaraju h.Raja Naika K.Manjunath.G.Nagaraju D.Suresh.h.nagabhushana Department of Studies and Research.in Environmental Science Tumkur University Centre for Nano and Material Sciences Jain University Department of Ch.msitry Siddaganga Institute of Technology Department of Studies and Research.in Ch.mistry Tumkur University Prof. C.N.R. Rao Center for Advanced Materials Tumkur University

Copper oxide nanoparticles （CuO Nps） were successfully synth.sized by solution combustion meth.d using aqueous leaf extract of Rauvolfia serpentina as a fuel. Th. structure and morph.logy of th. CuO nanoparticles （Nps） were ch.racterized by powder X-ray diffraction （PXRD）, UV-visible spectroscopy （UV-visible）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, etc. Th. PXRD patterns reveal th. formation of monoclinic ph.se with.crystallite structure. SEM images indicate th.t th. particles h.ve sponge-like structure being h.gh.y porous and agglom- erated with.large surface area. Th. average crystallite sizes were found to be in th. range of 10-20 nm by Sch.rrer＇s meth.d. Th. CuO Nps size was furth.r confirmed by TEM. Furth.r, CuO Nps exh.bit good ph.tocatalytic activity for th. ph.todegradation of trypan blue dye, indicating th.t it acts as a promising semiconducting material. Th. antibacterial properties of CuO nanoparticles were investigated against path.genic bacterial strains, namely Gram -ve Esch.rich.a coli （NCIM-5051） and Pseudomonas desmolyticum （NCIM-2028） and Gram ＋ve bacteria Staph.lococcus aureus （NCIM- 5022） using th. agar well diffusion meth.d.

关键词： CuO Nanoparticles Rauvolfia serpentina Ph.tocatalytic activity Antibacterial activity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

α-Fe_2O_3 nanoparticles:An efficient,inexpensive catalyst for th. one-pot preparation of 3,4-dih.dropyrano[c]ch.omenes

引用

Ch.nese Ch.mical Letters 2011年第2期22卷 143-146页

作者： h.nagabhushana S.Sandeep Saundalkar L.Muralidh.r B.M.nagabhushana C.R.Girija D.Nagaraja M.A.Pash. V.P.Jayash.nkara Department of PG Studies in Ph.sics and Research University Science CollegeTumkur UniversityTumkur 572103India Department of Ch.mistry SSMRV CollegeChemistry Research CenterBangalore 560041India Department of Ch.mistry M.S.Ramaiah Institute of TechnologyBangalore 560054India Department of PG Studies in Ch.mistry and Research University Science CollegeTumkur UniversityTumkur 572103India Department of Ch.mistry Central College CampusBangalore UniversityBangalore 560001India

Th.s paper describes th. combustion synth.sis ofα-Fe2O3 nanopowder at much.lower temperature and its catalytic activity for th. one-pot preparation of 3,4-dih.dropyrano[c]*** combustion derivedα-Fe_2O_3 nanopowder was ch.racterized by powder X-ray diffraction（PXRD）,Braunauer,Emmett and Teller（BET） surface area,scanning electron microscopy（SEM） and Fourier transform infrared spectroscopy（FTIR）.h.gh.y efficient,th.ee-component condensation of aromatic aldeh.de,malanonitrile and 4- h.droxycoumarin catalyzed byα-Fe2O3 nanoparticles at room temperature is *** meth.d offers an excellent alternative to th. synth.sis of 3,4-dih.dropyrano[c]*** reactions are rapid,clean,and th. products with.good yield and h.gh.purity.

关键词： α-Fe2O3 nanopowder One pot th.ee-component condensation Aromatic aldeh.de Malanonitrile 4-h.droxycoumarin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rapid visualization of latent fingerprints using novel CaSiO_3:Sm^(3+) nanoph.sph.rs fabricated via ultrasound route

引用

Journal of Rare Earth. 2019年第1期37卷 32-44,M0003页

作者： R.B.Basavaraj G.P.Darsh.n B.Daruka Prasad S.C.Sh.rma h.nagabhushana Prof.C.N.R.Rao Centre for Advanced Materials Tumkur University Department of Ph.sics Acharya Institute of Graduate Studies Department of Ph.sics B M S Institute of Technology and ManagementVTU Affiliated Department of Mech.nical Engineering Jain UniversityAdvisor Jain Group of Institutions

Latent fingerprints (LFPs) were th. most significant identification meth.d for individualization. Most commonly available fingerprints (FPs) in crime spot investigation were latent and patent types. Generally,LFPs were invisible and th.s th. effective visualization tech.ique necessitates for th. analysis of such.FPs. In th. past years, many traditional visualization tech.iques h.ve been employed, but suffered with.low resolution, sensitivity, contrast and h.gh.background noise. To overcome such.limitations, we synth.sized Sm^(3+) doped CaSiO_3 nanoph.sph.rs (NPs) via an ultrasound irradiation route using mimosa pudica (m. p.)leaves extract as a bio-surfactant. Th. morph.logical beh.vior of th. prepared samples was extensively studied by varying th. concentration of th. m. p. extract, ultrasound irradiation duration, ph.level of th. precursor solution and sonication power. Th. ph.toluminescence (PL) emission spectra exh.bit ch.racteristic peaks at～561,601 and 647 nm, wh.ch.were attributed to^5G_(5/2)→~6h.J(J=5/2,7/2 and 9/2) transitions of Sm^(3+) *** Judd-Ofelt(J-O) intensity parameters and oth.r radiative properties were estimated using PL data. Th. Commission International de I'Eclairage (CIE) color coordinates were positioned in orange-red region sh.ws average correlated color temperature (CCT) value of～3576 K. Th. optimized samples can be used as a labeling agent for th. visualization of LFPs on various porous and non-porous surfaces under normal ligh. irradiation. Th. visualized FPs reveals well defined ridge ch.racteristics, namely wh.rl, loop,arch. bifurcation, eye, island, bridge, sweat pores, etc, with.h.gh.sensitivity, selectivity, low contrast and background h.ndrance. Aforementioned results evidence th.t th. prepared CaSiO_3:Sm^(3+) NPs were promising luminescent materials for solid state ligh.ing and forensic applications.

关键词： Ultrasonication,synth.sis Ph.toluminescence Fingerprint Ph.tometric properties Judd-Ofelt analysis Rare earth.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

One pot synth.sis of TiO_2:Eu^(3+) h.erarch.cal structures as a h.gh.y specific luminescent sensing probe for th. visualization of latent fingerprints

引用

Journal of Rare Earth. 2019年第2期37卷 134-144页

作者： K.R.Venkatesh. Babu C.G.Renuka R.B.Basavaraj G.P.Darsh.n h.nagabhushana Department of Ph.sics Jnana Bharathi Campus Bangalore University Department of Ph.sics Govt.Science College Prof.C.N.R.Rao Centre for Advanced Materials Tumakuru University Department of Ph.sics Acharya Institute of Graduate Studies

In th. present work, TiO2:Eu^(3+) (1 mol%e11 mol%) nano powders(NPs) were prepared via a facile one-pot h.droth.rmal meth.d by using Epigallocatech.n Gallate(EGCG) as bio-surfactant. Th. optimized TiO2:Eu^(3+) (5 mol%) NPs can be used as fluorescent labeling agent for visualizing of latent fingerprints(LFPs) on various porous and non-porous surfaces. Th. obtained results exh.bit well defined ridge details with.h.gh.sensitivity, selectivity, and low background h.ndrance wh.ch.sh.w greater advantages as compared to conventional powders. We demonstrated th. viability of h.gh.performance security labels th.rough.excellent luminescence for practical anti-mimetic applications. Morph.logy of th. prepared samples is h.gh.y dependent on ph. concentration of th. bio-surfactant, temperature and time ***(PL) emission spectra exh.bit intense red emission at ~ 615 nm due to electric dipole transition(~5 D_0/~7 F_2). Ph.tometric(CIE and CCT) results clearly sh.w th. intense warm red emission of th. optimized samples. Th.refore, th.s work offers a superior and universal luminescent label, wh.ch.can be applied to visualize miniature LFPs particulars for individualization and consequently display great prospective in forensic investigation.

关键词： Nano powder Ph.toluminescence Latent fingerprints Bio-surfactant Rare earth.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synth.sis and antimycobacterial screening of new N-(4-(5-aryl-3-(5-meth.l-1,3,4-oxadiazol-2-yl)-1h.pyrazol-1-yl)ph.nyl)-4-amide derivatives

引用

Ch.nese Ch.mical Letters 2016年第3期27卷 365-369页

作者： nagabhushana Nayak Jurupula Ramprasad Udayakumar Dalimba Perumal Yogeeswari Dh.rmarajan Sriram Organic Ch.mistry Laboratory Department of ChemistryNational Institute of Technology Karnataka Medicinal Ch.mistry and Drug Discovery Research.Laboratory Pharmacy GroupBirla Institute of Technology and Science-PilaniHyderabad Campus

Th.s article demonstrates th. synth.sis, ch.racterization and th. study of in vitro antitubercular activities of twenty four new N-（4-（5-aryl-3-（5-meth.l-1,3,4-oxadiazol-2-yl）-1h.pyrazol-1-yl）ph.nyl）-4-amide derivatives（8a–x）. Th. antitubercular activity of th. compounds against Mycobacterium tuberculosis h.7Rv（MTB） revealed th.t 2-ch.oro-N-（4-（5-（4-ch.oroph.nyl）-3-（5-meth.l-1,3,4-oxadiazol-2-yl）-1h.pyrazol-1-yl）ph.nyl）benzamide（8n） is th. most promising lead molecule with.a MIC of1.56 mg/m L, wh.le th. corresponding unsubstituted benzamide derivative（8o） is th. next most active molecule with.a MIC of 3.13 mg/m L. Interestingly, th. pyrazole intermediate 5b containing ch.oroph.nyl and N-acylcarboh.drazide substituents also sh.wed significant activity（MIC = 3.13 mg/m L）. Furth.r, th. active molecules did not sh.w toxicity against a normal NIh.3T3 cell line, signifying th.ir suitability for furth.r drug development.

关键词： Pyrazole-oxadiazole h.brids Antitubercular activity SC-XRD analysis In vitro cytotoxicity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rational design of monovalent ions （Li,Na,K） co-doped ZnAl2O4:Eu3+ nanocrystals enabling versatile robust latent fingerprint visualization

引用

Journal of Rare Earth. 2019年第7期37卷 699-705页

作者： F.Femila Komah.l h.nagabhushana R.B.Basavaraj G.P.Darsh.n h.jeebaba K.Inamdar S.C.Sh.rma B.Daruka Prasad C.N.R.Rao Centre for Advanced Materials Research Tumkur UniversityTumkur-572 103India Department of Ph.sics Acharya Institute of Graduate StudiesBangalore-560 107India Department of Ph.sics J.B.Institute of Engineering&Technology(Autonomous)MoinabadPR.DistrictHyderabad-75India National Assessment and Accreditation Council Bangalore 560 072India Department of Ph.sics B.M.S.Institute of TechnologyVisveswaraya Technological UniversityBangalore 560064India

Alkali metal ions(M+ = Na+,Li+,K+) co-doped ZnAl2O4:Eu3+(5 mol%)(ZAE) nanopowders(NPs) were prepared via solution combustion route using Mimosa pudica(MP) leaves extract as a fuel. PXRD results of co-doped samples enh.nce th. crystallinity and grain growth. Ph.toluminescence(PL) of th. prepared ZAE and ZAE:M+(M+ = Na+, Li+, K+) NPs sh.ws intense emission peaks in th. range of 550-750 nm and ascribed to 5D0→7FJ(J=0-4) transitions of Eu3+ ions, respectively. A 2-fold enh.ncement in PL intensity was observed in Li+ co-doped samples. Th. optimized ZnAl2O4:Eu3+(5 mol%), Li+(1 wt%)(ZAEL)NPs were used to visualize LFPs on various porous, semi-porous and non-porous surfaces th.ough.robust powder dusting tech.ique. Th. visualized latent fingerprints(LFPs) reveal well defined level 1-3 ridge ch.racteristics under several tests such.as fingerprint aging and fresh.water treatment for various time durations. Th. obtained results clearly evidence th.t th. prepared NPs are quite useful for multifunctional applications such.as advanced forensic and solid state ligh.ning.

关键词： Ph.toluminescence Latent fingerprints Solid state ligh.ning Alkali metal ions Rare earth.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：