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Research Letters in Nanotechnology最新文献

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Achieving High Aspect Ratio of Track Length to Width in Molds for Discrete Track Recording Media 实现高长宽比在模具的离散轨道记录媒体
Research Letters in Nanotechnology Pub Date : 2008-06-08 DOI: 10.1155/2008/765398
K. O. Aung, C. Shankaran, R. Sbiaa, E. Tan, S. Wong, S. Piramanayagam
{"title":"Achieving High Aspect Ratio of Track Length to Width in Molds for Discrete Track Recording Media","authors":"K. O. Aung, C. Shankaran, R. Sbiaa, E. Tan, S. Wong, S. Piramanayagam","doi":"10.1155/2008/765398","DOIUrl":"https://doi.org/10.1155/2008/765398","url":null,"abstract":"Discrete track media (DTM) fabricated by nanoimprint lithography (NIL) is considered as a potential technology for future hard disk drives (HDD). In the fabrication of a master mold for NIL, patterning the resist tracks with a narrow distribution in the width is the first critical step. This paper reports the challenges involved in the fabrication of high aspect ratio discrete tracks on Polymethylmethacrylate (PMMA) resist by means of electron beam lithography. It was observed that fabrication parameters applied for successful patterning of discrete tracks in nanoscale length were not directly suitable for the patterning of discrete tracks in micron scale. Hence different approaches such as thick layer resist coating, introducing of post exposure baking process, and varying of exposure parameters were used in order to achieve uniform sharp discrete tracks in micron scale length on the resist. The optimal parameters were used to pattern 20 𝜇m long tracks with 70 nm track pitch on the resist.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115587792","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: 3
Iron Oxide Doped Alumina-Zirconia Nanoparticle Synthesis by Liquid Flame Spray from Metal Organic Precursors 金属有机前驱体液相火焰喷涂合成氧化铁掺杂氧化铝-氧化锆纳米颗粒
Research Letters in Nanotechnology Pub Date : 2008-05-18 DOI: 10.1155/2008/516478
Juha‐Pekka Nikkanen, H. Keskinen, M. Aromaa, M. Järn, T. Kanerva, E. Levänen, J. Mäkelä, T. Mäntylä
{"title":"Iron Oxide Doped Alumina-Zirconia Nanoparticle Synthesis by Liquid Flame Spray from Metal Organic Precursors","authors":"Juha‐Pekka Nikkanen, H. Keskinen, M. Aromaa, M. Järn, T. Kanerva, E. Levänen, J. Mäkelä, T. Mäntylä","doi":"10.1155/2008/516478","DOIUrl":"https://doi.org/10.1155/2008/516478","url":null,"abstract":"The liquid flame spray (LFS) method was used to make iron oxide doped alumina-zirconia nanoparticles. Nanoparticles were generated using a turbulent, high-temperature (𝑇max∼3000 K) H2-O2 flame. The precursors were aluminium-isopropoxide, zirconium-𝑛-propoxide, and ferrocene in xylene solution. The solution was atomized into micron-sized droplets by high velocity H2 flow and introduced into the flame where nanoparticles were formed. The particle morphology, size, phase, and chemical composition were determined by TEM, XRD, XPS, and N2-adsorption measurements. The collected particulate material consists of micron-sized aggregates with nanosized primary particles. In both doped and undoped samples, tetragonal phase of zirconia was detected in room temperature while alumina was found to be noncrystalline. In the doped powder, Fe was oxidized to Fe2O3. The primary particle size of collected sample was approximately from 6 nm to 40 nm. Doping was observed to increase the specific surface area of the powder from 39 m2/g to 47 m2/g.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123167893","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: 8
Apparent Enhanced Solubility of Single-Wall Carbon Nanotubes in a Deuterated Acid Mixture 单壁碳纳米管在氘化酸混合物中的溶解度明显增强
Research Letters in Nanotechnology Pub Date : 2008-04-30 DOI: 10.1155/2008/296928
T. Ramanathan, F. Fisher, R. Ruoff, L. Brinson
{"title":"Apparent Enhanced Solubility of Single-Wall Carbon Nanotubes in a Deuterated Acid Mixture","authors":"T. Ramanathan, F. Fisher, R. Ruoff, L. Brinson","doi":"10.1155/2008/296928","DOIUrl":"https://doi.org/10.1155/2008/296928","url":null,"abstract":"An apparent enhanced solubility of single-wall carbon nanotubes (SWNTs) in the deuterated form of the standard 3 : 1 sulfuric (H2SO4) to nitric (HNO3) acid mixture treatment is reported and attributed to the stronger interaction of deuterium bonds with the single-wall carbon nanotube surface. UV-Visible spectroscopy was used to characterize the apparent enhanced solubility of the SWNTs treated in deuterated forms of the acid mixture in comparison to the standard acid mix, while FTIR was used to analyze the nature of the functional groups generated on the SWNTs as a result of the different acid treatments. The apparent enhanced solubility reported here is consistent with the limited number of computational and experimental results published in the literature regarding the interaction of carbon nanotubes with deuterated solvents; however, a detailed understanding of the underlying mechanism responsible for this observation is currently lacking. The apparent increased solubility observed here could potentially be utilized in many applications where carbon nanotube dispersion is required.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125573722","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: 11
Gold and TiO2 Nanostructurated Surfaces for Assembling of Electrochemical Biosensors 用于组装电化学生物传感器的金与TiO2纳米结构表面
Research Letters in Nanotechnology Pub Date : 2008-04-03 DOI: 10.1155/2008/789153
A. Curulli, D. Zane
{"title":"Gold and TiO2 Nanostructurated Surfaces for Assembling of Electrochemical Biosensors","authors":"A. Curulli, D. Zane","doi":"10.1155/2008/789153","DOIUrl":"https://doi.org/10.1155/2008/789153","url":null,"abstract":"Devices based on nanomaterials are emerging as a powerful and general class of ultrasensitive sensors for the direct detection of biological and chemical species. In this work, we report the preparation and the full characterization of nanomaterials such as gold nanowires and TiO2 nanostructured films to be used for assembling of electrochemical biosensors. Gold nanowires were prepared by electroless deposition within the pores of polycarbonate particle track-etched membranes (PTMs). Glucose oxidase was deposited onto the nanowires using self-assembling monolayer as an anchor layer for the enzyme molecules. Finally, cyclic voltammetry was performed for different enzymes to test the applicability of gold nanowires as biosensors. Considering another interesting nanomaterial, the realization of functionalised TiO2 thin films on Si substrates for the immobilization of enzymes is reported. Glucose oxidase and horseradish peroxidase immobilized onto TiO2-based nanostructured surfaces exhibited a pair of well-defined and quasireversible voltammetric peaks. The electron exchange between the enzyme and the electrodes was greatly enhanced in the TiO2 nanostructured environment. The electrocatalytic activity of HRP and GOD embedded in TiO2 electrodes toward H2O2 and glucose, respectively, may have a potential perspective in the fabrication of third-generation biosensors based on direct electrochemistry of enzymes.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126539428","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: 2
Charge Transport Phenomena in Peptide Molecular Junctions 多肽分子结中的电荷传输现象
Research Letters in Nanotechnology Pub Date : 2008-03-26 DOI: 10.1155/2008/853253
A. Luchini, D. Long, I. Vaisman, E. Petricoin, D. Geho, L. Liotta
{"title":"Charge Transport Phenomena in Peptide Molecular Junctions","authors":"A. Luchini, D. Long, I. Vaisman, E. Petricoin, D. Geho, L. Liotta","doi":"10.1155/2008/853253","DOIUrl":"https://doi.org/10.1155/2008/853253","url":null,"abstract":"Inelastic electron tunneling spectroscopy (IETS) is a valuable in situ spectroscopic analysis technique that provides a direct portrait of the electron transport properties of a molecular species. In the past, IETS has been applied to small molecules. Using self-assembled nanoelectronic junctions, IETS was performed for the first time on a large polypeptide protein peptide in the phosphorylated and native form, yielding interpretable spectra. A reproducible 10-fold shift of the I/V characteristics of the peptide was observed upon phosphorylation. Phosphorylation can be utilized as a site-specific modification to alter peptide structure and thereby influence electron transport in peptide molecular junctions. It is envisioned that kinases and phosphatases may be used to create tunable systems for molecular electronics applications, such as biosensors and memory devices.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121055487","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
Assembly/Disassembly of DNA-Au Nanoparticles: A Strategy of Intervention dna -金纳米颗粒的组装/拆卸:一种干预策略
Research Letters in Nanotechnology Pub Date : 2008-02-13 DOI: 10.1155/2008/527294
I. Lim, Lingyan Wang, Uma Chandrachud, S. Gal, C. Zhong
{"title":"Assembly/Disassembly of DNA-Au Nanoparticles: A Strategy of Intervention","authors":"I. Lim, Lingyan Wang, Uma Chandrachud, S. Gal, C. Zhong","doi":"10.1155/2008/527294","DOIUrl":"https://doi.org/10.1155/2008/527294","url":null,"abstract":"This report describes the viability of a strategy for manipulating the assembly/disassembly processes of DNA-Au nanoparticles by molecular intervention. Using the temperature-induced assembly and disassembly processes of DNAs and gold nanoparticles as a model system, the introduction of a molecular recognition probe is demonstrated to lead to the intervention of the assembly/disassembly processes depending on its specific biorecognition. This process can be detected by monitoring the change in the optical properties of gold nanoparticles and their DNA assemblies. Implications of the preliminary results to exploration of the resulting nanostructures for fine-tuning of the interfacial reactivities in DNA-based bioassays and biomaterial engineering are also discussed.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127616669","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: 2
Patterning of Gold Nanoparticles on DNA Self-Assembled Scaffolds 金纳米颗粒在DNA自组装支架上的图案
Research Letters in Nanotechnology Pub Date : 2008-02-11 DOI: 10.1155/2008/827174
Immensee Cheng, Bryan Wei, Xunyun Zhang, Yongjian Wang, Y. Mi
{"title":"Patterning of Gold Nanoparticles on DNA Self-Assembled Scaffolds","authors":"Immensee Cheng, Bryan Wei, Xunyun Zhang, Yongjian Wang, Y. Mi","doi":"10.1155/2008/827174","DOIUrl":"https://doi.org/10.1155/2008/827174","url":null,"abstract":"We report a method of patterning the 1D and 2D arrays of gold nanoparticles on the DNA self-assembled scaffolds. The 5 nm gold nanoparticle was well positioned at the center of each 4×4 tile motif of the DNA scaffold. The precisely located gold particles can form 1D and 2D arrays. This controllable scaffolding technology may become a promising tool for nanoscaled fabrication of electronics and photonic devices.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116664390","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: 4
Effect of Premelting on Conductivity of DNA-Lipid Films 预熔对dna -脂质膜导电性的影响
Research Letters in Nanotechnology Pub Date : 2007-04-20 DOI: 10.1155/2009/540257
A. Kasumov, S. Nakamae, M. Cazayous, T. Kawasaki, Y. Okahata
{"title":"Effect of Premelting on Conductivity of DNA-Lipid Films","authors":"A. Kasumov, S. Nakamae, M. Cazayous, T. Kawasaki, Y. Okahata","doi":"10.1155/2009/540257","DOIUrl":"https://doi.org/10.1155/2009/540257","url":null,"abstract":"We have measured temperature-dependent (between 20 and 80∘C) electrical conductivity and molecular structure (Raman spectroscopy) of DNA-lipid cast film. Our findings show that the conductivity is strongly influenced by premelting effects in the molecular structure starting near physiological temperatures (∼40∘C), prior to the global DNA denaturation.","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128334674","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: 2
Studies on Calcium Ion Selectivity of ZnO Nanowire Sensors Using Ionophore Membrane Coatings 离子载体膜涂层ZnO纳米线传感器对钙离子选择性的研究
Research Letters in Nanotechnology Pub Date : 1900-01-01 DOI: 10.1155/2008/701813
M. Asif, O. Nour, M. Willander, M. Yakovleva, B. Danielsson
{"title":"Studies on Calcium Ion Selectivity of ZnO Nanowire Sensors Using Ionophore Membrane Coatings","authors":"M. Asif, O. Nour, M. Willander, M. Yakovleva, B. Danielsson","doi":"10.1155/2008/701813","DOIUrl":"https://doi.org/10.1155/2008/701813","url":null,"abstract":"Zinc oxide nanorods with 100nm diameter and 900nm length were grown on the surface of a silver wire (0.25mm in diameter)\u0000with the aim to produce electrochemical nanosensors. It is shown that the Zn ...","PeriodicalId":145228,"journal":{"name":"Research Letters in Nanotechnology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124205406","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: 14
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