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Fabrication of cost-effective, highly reproducible large area arrays of nanotriangular pillars for surface enhanced raman scattering substrates

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Nano Research 2016年第10期9卷 3075-3083页

作者： Kudilatt Hasna Aldrin Antony Joaquim Puigdollers kumaran Rajeev kumar Madambi Kunjukuttan Jayaraj Nanophotonic & Optoelectronic Devices Laboratory Department of Physics Cochin University of Science & Technology Kochi 682 022 India Department of Instrumentation Cochin University of Science & Technology Kochi 682 022 India Department of Energy Science and Engineering Indian Institute of Technology Bombay Maharashtra 400 076 India Department of Enginyeria Electronica Universitat Politecnica Catalunya C/Jordi Girona 31 Modul C4 Barcelona 08034 Spain

Development of cost-effective, highly reproducible non-conventional fabrication techniques for anisotropic metal nanostructures is essential to realizing potential applications of plasmonic devices, photonic devices, and surface enhanced raman scattering （SERS） phenomenon based sensors. This report highlights the fabrication of nanotriangle arrays via nanoimprinting to overcome difficulties in creating large-area SERS active substrates with uniform, reproducible raman signals. Electron beam lithography of anisotropic nanostructures, formation of arrays of nanotriangles in silicon and the transfer of triangular shapes to polymethylmethacrylate （PMMA） sheets via nanoimprinting have not been reported elsewhere. The reuse of silicon masters offers potential for production of low cost SERS substrates. The SERS activity and reproducibility of nanotriangles are illustrated and a consistent average enhancement factor of up to -2.9 × 1011, which is the highest value reported for a patterned SERS substrate, is achieved.

关键词： metal nanostructures localized surface plasmon resonance (LSPR) surface enhanced ramanscattering (SERS) substrate enhancement factor

Spectral narratives of microstructural restyling and their controls on hydrocarbon generation potential from coal

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International Journal of Coal Science & Technology 2023年第3期10卷 167-189页

作者： Tushar Adsul Santanu Ghosh Anwita Ojha Sudip Bhattacharyya Atul kumar Varma Coal Geology and Organic Petrology Laboratory Department of Applied GeologyIndian Institute of Technology(Indian School of Mines)DhanbadJharkhand 826004India Department of Geology Mizoram UniversityAizawlMizoram 796004India Specialized Coal Petrography Laboratory Natural Energy ResourcesMission II-BGeological Survey of IndiaDK-6Sector-IlSalt Lake CityKolkataWest Bengal 700091India

The low to medium-rank Tertiary coals from Meghalaya,India,are explored for the first time for their comprehensive micro-structural characterization using the FTIR and raman ***,results from these coals are compared with the Permian medium and high-rank coals to understand the microstructural restyling during coalification and its controls on hydrocarbon *** coal samples are grouped based on the mean random vitrinite reflectance values to record the transformations in spectral attributes with increasing coal *** aliphatic carbon and the apparent aromaticity respond sharply to the first coalification jump(R:0.50%)during low to medium-rank transition and anchizonal metamorphism of the high-rank ***,the raman band intensity ratio changes during the first coalification jump but remains invari-able in the medium-rank coals and turns subtle again during the onset of pregraphitization in high-rank coals,revealing a polynomial trend with the coal *** Rock-Eval hydrogen index and genetic potential also decline sharply at the first coalification ***,an attempt to comprehend the coal microstructural controls on the hydrocarbon poten-tial reveals that the Tertiary coals comprise highly reactive aliphatic functionalities in the type I-S kerogen,along with the low paleotemperature(74.59-112.28℃)may signify their potential to generate early-mature ***,the presence of type II-II admixed kerogen,a lesser abundance of reactive moieties,and overall moderate paleotemperature(91.93-142.52℃)of the Permian medium-rank coals may imply their mixed hydrocarbon ***,anchizonal metamorphism,polycondensed aromatic microstructure,and high values of paleotemperature(~334.25 to~366.79℃)of the high-rank coals indicate a negligible potential of producing any hydrocarbons.

关键词： Early mature oil generation Meghalaya high-sulfur coal Type II-S kerogen Microstructural ordering Coalification jump Hydrocarbon generation potential

Effect of rare earth(Nd^(3+))metal doping on structural,morphological,optical and magnetic traits of Zn-Mg nano-ferrites

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Journal of Rare Earths 2023年第11期41卷 1763-1770,I0004页

作者： Rohit Jasrotia Nisha kumari Ritesh Verma Suman Sachin kumar Godara Jahangeer Ahmed Saad M.Alshehri Bidhan Pandit Sanjay kumar Himanshi Shubham Sharma Kirti Pradip K.Maji School of Physics&Materials Science Shoolini University of Biotechnology and Management SciencesSolanHimachal Pradesh173229India Himalayan Centre of Excellence in Nanotechnology Shoolini UniversityBajholSolanH.P173229India Department of Physics Baddi University of Emerging Science and TechnologyMakhnumajraBaddiHimachal Pradesh173205India Department of Physics Amity University HaryanaGururgram122413India Department of Mathematics School of Basic and Applied SciencesMaharaja Agrasen UniversityBaddiH.P174103India Department of Apparel and Textile Technology Guru Nanak Dev UniversityAmritsar143005India Department of Chemistry College of ScienceKing Saud UniversityP.O.Box 2455Riyadh11451Saudi Arabia Department of Materials Science and Engineering and Chemical Engineering Universidad Carlos III de MadridAvenida de la Universidad 3028911LeganésMadridSpain School of Advanced Chemical Sciences Shoolini University of Biotechnology and Management SciencesSolanHimachal Pradesh173229India Dept.of Polymer&Process Engineering Indian Institute of Technology RoorkeeSaharanpurUttar Pradesh247001India

Herein,we report the synthesis of Zn_(0.7)Mg_(0.3)Nd_(x)Fe_(2-x)O_(4)(where,x=0,0,0,01,0,02)ferrite nanoparticles by employing the sol-gel auto-combustion *** X-ray diffraction(XRD)pattern suggests the formation of a pure cubic structure,without any impurity phase,with an Fd3m space group at room *** increasing doping amount,the crystallite size is reported as 35-41 nm,while the lattice parameters rise from 0.8381 to 0.8395 *** emission scanning electron microscopy(FESEM)images show the formation of spherical grains with agglomerated morphology in all the samples,with grain sizes ranging from 49 to 103 *** dispersive X-ray spectroscopy(EDX)and elemental mapping investigation confirm the chemical purity of all the *** transform infrared(FTIR)analysis shows the presence of two prominent peaks around 440 and 560 cm^(-1)that correspond to the octahedral and tetrahedral *** addition,the existence of five raman active vibratio nal modes in all produced specimens again confirms the structural purity of all the *** M-H curve shows that saturation magnetization(M_(s))first increases from 14.98 to 28.22 emu/g and then decreases to 18.98emu/g with increasing doping *** is due to the A-B type super-exchange interaction for the synthesized *** variation in coercivity(H_(c))and magnetic anisotropy(K_(1))suggest the thermal stability of all the samples and can be utilized in transformers and solenoids.

关键词： Magnetic nanoparticles Saturation magnetization Sol-gel auto-combustion synthesis Super-exchange interaction Cubic crystal structure Rare earths

快速热处理化学气相沉积法制备用于电子产品热管理的轻质柔性石墨烯

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新型炭材料（中英文） 2023年第3期38卷 534-542页

作者： Satendra kumar Manoj Goswami Netrapal Singh Uday Deshpande Surender kumar N.Sathish Academy of Scientific and Innovative Research(AcSIR) Ghaziabad 201002India CSIR-Advanced Materials and Processes Research Institute(AMPRI) Bhopal 462026India UGC-DAE Consortium for Scientific Research University CampusIndore 452001India

下一代电子产品的飞速发展对热管理提出了更高的要求。初始石墨烯的导热性是铜的13倍。本文通过快速热处理化学气相沉积(RTP-CVD)法制备了具有大sp^(2)结构域的单层、双层和多层石墨烯(SLG、BLG、FLG),进一步通过低浓度H_(2)还原制备了... 详细信息

下一代电子产品的飞速发展对热管理提出了更高的要求。初始石墨烯的导热性是铜的13倍。本文通过快速热处理化学气相沉积(RTP-CVD)法制备了具有大sp^(2)结构域的单层、双层和多层石墨烯(SLG、BLG、FLG),进一步通过低浓度H_(2)还原制备了高导热石墨烯。在1000℃下生长25 min制备出SLG,利用拉曼光谱和透射电子显微镜(TEM)研究了石墨烯的品质。为了验证RTP-CVD法生成的石墨烯的散热能力,将其作为2TB固态硬盘的散热器,通过红外热成像仪进行了研究。结果证明,RTP-CVD生长的石墨烯用于消费电子产品的热管理测试时性能表现优异。SLG显示温度(最高)比商用铜散热器低5℃,SLG的散热能力比商用铜散热器快200倍左右。综上,利用RTP-CVD法制备的轻质的柔性石墨烯可以成为下一代5G设备和消费电子产品热管理的更好选择。

关键词：石墨烯热管理消费类电子产品化学气相沉积

Adoption and Impact of Modern Rice Varieties on Poverty in Eastern India

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Rice science 2020年第1期27卷 56-66页

作者： Richard Kwasi BANNOR Gupta Amarnath Krishna kumar Helena OPPONG-KYEREMEH Camillus Abawiera WONGNAA Department of Agricultural Economics Agribusiness and ExtensionUniversity of Energy and Natural ResourcesSunyaniGhana Indian Council of Agricultural Research-National Rice Research Institute Cuttack 753006OrissaIndia Department of Agricultural Economics Agribusiness and ExtensionKwame Nkrumah University of Science and TechnologyKumasiGhana

The factors affecting the adoption of modern varieties(MVs) of rice and impact on poverty in Odisha, India were discussed. A total of 363 households from Cuttack and Sambalpur districts of Odisha via multistage sampling technique participated in the survey. The Cragg's Double hurdle model was used to model the determinants of adoption and intensity of adoption of MVs of rice, and the propensity score matching was used to analyze the impact of adoption on poverty. The results showed that age, education, risk aversion, land size, yield, perception of MVs as high yielding, resistant to diseases and availability of MVs positively influenced the decision to adopt. However, variables such as household size, experience of a farmer, off-farm job participation, amount of credit received, cost of seeds, insecticides and fertilizers negatively influenced the adoption of MVs. Intensity of adoption of MVs was negatively influenced by experience of a farmer, cost of fertilizer and marketability of MVs, and positively affected by household size, risk aversion, land size, cost of insecticides, perception of MVs as high yielding and availability of MV seeds. Poverty incidence, gap and severity were high among non-adopters to adopters of MVs. After matching adopters and non-adopters of MV groups using four different algorithms of nearest neighbour matching, stratification matching, radius matching and kernel matching, the impact of MV adoption resulted in higher per capita monthly household expenditure by about US$ 52.82 to US$ 63.17.

关键词： rice adoption poverty Cragg's Double hurdle model modern variety

Analysis of TiO2 for microelectronic applications:effect of deposition methods on their electrical properties

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Frontiers of Optoelectronics 2011年第4期4卷 349-358页

作者： Davinder RATHEE Sandeep K ARYA Mukesh kumar Department of Electronics and Communication Engineering Guru Jambheshwar University of Science & Technology Department of Electronics Science Kurukshetra University

Metal oxide semiconductor（MOS） device down-scaling is a powerful driving force for the evolution of microelectronics. The downsizing rate of metal oxide semiconductor field effect transistors（MOSFETs） is really marvelous. Silicon dioxide（SiO2） has served as a perfect gate dielectric for the last four decades. Due to physical limitations, leakage current, high interface trap charge it now needs to be replaced with higher permittivity dielectric material. Keeping the motivation for the search of high-k materials, extensive studies have been carried out on several metal oxides, such as ZrO2, Ta2O5, TiO2, Al2O3and HfO2for the replacement of SiO2. The high dielectric constant（k） of titanium dioxide（TiO2） will open multifaceted prospects for the use of this material in microelectronic devices. In this paper, a comparative study of various deposition methods for fabrication of thin TiO2films has been presented. This work uses a combination of simulation results, experimental data and critical analysis of published data. Further, an experiment using sol-gel method has been carried out to deposit thin films of TiO2. It has been characterized and compared with the earlier reported fabrication methods. The X-ray diffraction analyses and raman spectra indicate the presence of anatase TiO2phase in the film. The dielectric constant as calculated using capacitance-voltage（C-V） analysis was found to be 23. The refractive index of the film was *** TiO2films studied for microelectronic applications and present acceptable properties such as low leakage current density of 1.0×10–5A/cm at 1 V and band gap of 3.6 eV. The leakage current has been found to be dominant by the Schottky emission at lower electric field, while Flower-Nordheim（F-N） tunneling occurs at higher biasing voltages.

关键词： titanium dioxide (TiO 2 ) high- k material sol-gel thin films atomic force microscopy (AFM) capacitance-voltage ( C-V ) analysis

Cobalt doped ZrO2 decorated multiwalled carbon nanotube:A promising nanocatalyst for photodegradation of indigo carmine and eosin Y dyes

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Progress in Natural Science:Materials International 2016年第4期26卷 354-361页

作者： William Wilson Anku Samuel Osei-Bonsu Oppong Sudheesh kumar Shukla Eric Selorm Agorku Poomani Penny Govender Department of Applied Chemistry University of Johannesburg

This paper reports the degradation of indigo carmine and eosin Y dyes in water, catalyzed by cobalt and multiwalled carbon nanotube modified zirconium oxide nanocomposite（Co-ZrO2-MWCNTs） under simulated visible light. The bare ZrO2,ZrO2-MWCNTs, Co-ZrO2and Co-ZrO2-MWCNTs with different percentage compositions of cobalt were synthesized by homogeneous co-precipitation method. Characterization of the prepared nanocomposites was carried out using X-Ray powder Diffraction（XRD）, Fourier Transformer Infrared（FTIR） Spectroscopy, Transmission Electron Microscopy（TEM）, raman Spectroscopy,（UV–Vis）-Spectroscopy and Energy Dispersive Spectroscopy（EDS） for their structure, formation,morphology, size and elemental analysis. The experimental results indicated that all the cobalt and MWCNTs modified nanocomposites demonstrated higher photocatalytic activities compared to the bare ZrO2. The most efficient catalyst（0.5% Co-ZrO2-MWCNTs） with the band gap and Ka values of 5.21 e V and 16.86*10-3min-1respectively exhibited 98% degradation efficiency toward indigo carmine and 87% toward eosin Y in 180 min.

关键词： Multiwalled carbon nanotube Cobalt ZrO2 Nanocomposite Photodegradation

Mycogenic Silver Nanoparticles From Endophytic Trichoderma atroviride with Antimicrobial Activity

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Journal of Renewable Materials 2020年第2期8卷 171-185页

作者： Ahmed Abdel-Azeem Amr A.Nada Anthonia O’Donovan Vijay kumar Thakur Amr Elkelish Microbiology Section Department of BotanyFaculty of ScienceUniversity of Suez CanalIsmailia41522Egypt Department of Analysis and Evaluation Egyptian Petroleum Research InstituteNasr CityCairoP.B.11727Egypt Institut Européen des Membranes IEMUMR-5635Univ MontpellierENSCMCNRSMontpellierFrance School of Science and Computing Galway-Mayo Institute of TechnologyGalwayIreland Enhanced Composites and Structures Center School of AerospaceTransport and ManufacturingCranfield UniversityBedfordshireUK Botany Section Department of BotanyFaculty of ScienceUniversity of Suez CanalIsmailia41522Egypt

There is an increasing interest in developing nanoparticles with diverse biologic *** this end,we prepared 10 to 15 nm silver nanoparticles(AgNP)from native isolates of Trichoderma *** this study,endophytic fungi hosted four medicinal plants in Saint Katherine Protectorate,South Sinai,Egypt have been isolated by surface sterilization technique on four isolation *** species,based on their frequency of occurrence,out of twenty recovered taxa were tested for their capability to synthesize extracellular *** atroviride hosted Chiliadenus montanus was found to be the best candidate for the production of mycogenic AgNPs among all examined *** mycosynthesized AgNPs were compared with chemically synthesized and characterized using Ultraviolet-visible(UV-vis)spectroscopy,raman spectroscopy,X-ray diffraction(XRD)and high-resolution transmission electron microscopy(HRTEM)*** HRTEM result showed the distribution of spherical AgNPs ranging from 10 to 15 *** atroviride isolate was subjected to sequencing for confirmation of phenotypic *** internal transcribed spacer(ITS)1-5.8 s-ITS2 rDNA sequences obtained were compared with those deposited in the GenBank Database and registered with accession number MH283876 in the NCBI ***,anticandidal and antifungal effects of chemically and mycosynthesized AgNPs were examined at various concentrations in vitro against six pathogenic bacteria and 4 pathogenic fungi by agar well diffusion *** antibiotics;Gentamicin,Amoxicillin,Clotrimazole,and Nystatin at 5μg/disk were taken as positive controls,while 5%DMSO was used as the negative *** data revealed that the application of mycogenic AgNPs at a concentration of 100 ppm resulted in maximum inhibition of pathogenic bacteria and *** data suggest that AgNPs from native isolates of Trichoderma atroviride(MH283876)offer a source of rapid synthesis of eco-friendly,e

关键词： Antimicrobial endobionts mycogenic AgNPS Saint Katherine Protectorate

Microwave-assisted synthesis of Mg:PbI2 nanostructures and their structural,morphological,optical,dielectric and electrical properties for optoelectronic technology

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Chinese Physics B 2020年第11期29卷 420-426页

作者： Mohd.Shkir Ziaul Raza Khan T Alshahrani Kamlesh VChandekar M Aslam Manthrammel Ashwani kumar S AlFaify Advanced Functional Materials and Optoelectronics Laboratory(AFMOL) Department of PhysicsCollege of ScienceKing Khalid UniversityAbha 61413P.O.Box 9004Saudi Arabia Department of Physics College of ScienceUniversity of HailP.O.Box 2440HailSaudi Arabia Department of Physics College of SciencePrincess Nourah Bint Abdulrahman UniversityRiyadh 11671Saudi Arabia Department of Physics Rayat Shikshan Sanstha’sKarmaveer Bhaurao Patil CollegeVashiNavi Mumbai 400703India Department of Physics IK Gujral Punjab Technical UniversityJalandhar 144603India

This work reports the cost-effective growth of Mg:PbI2 nanostructures with 0,1,2.5 and 5.0 wt.%Mg doping ***,vibrational,morphological properties are analyzed using x-ray diffraction(XRD),raman spectroscopy and scanning electron microscopy(SEM).XRD and raman studies confirm the monophasic hexagonal system of Mg:PbI2,and no additional impurity peaks are *** Scherrer formula is used to determine sizes of crystallites to be in the range of 47-52 ***/SEM e-mapping analyses confirm the incorporation of Mg in PbI2 matrix and its uniform distribution throughout the *** hexagonal nanosheet-and nanoplate-like morphologies are detected in SEM images for pure and Mg-doped *** optical band gap of nanostructures is obtained from Tauc’s relation to be in the range 3.0-3.25 *** and electrical properties are found in significant enhancement as Mg doping in PbI2 matrix,also the conduction mechanism is discussed.

关键词： Mg:PbI2 nanostructures structural properties optical band gap dielectric constant ac conductivity