Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601391
Song Han, Minsheng Wang, S. Gilje, R. Kaner, K.L. Wang
Single sheet graphite oxide films are synthesized by intercalation and exfoliation routes of graphite. Those insulating graphite oxide films were deposited on SiO2/Si substrates and reduced to semiconducting graphene. Field effect transistors of these graphite oxide and graphene films were fabricated. The transport properties of the devices were studied before and after the reduction reaction. Such method opens up the possibility of preparing high quality, large area and manufacturable graphene films with low cost.
{"title":"Semiconducting graphite oxide films for large scale carbon based electronics","authors":"Song Han, Minsheng Wang, S. Gilje, R. Kaner, K.L. Wang","doi":"10.1109/NANO.2007.4601391","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601391","url":null,"abstract":"Single sheet graphite oxide films are synthesized by intercalation and exfoliation routes of graphite. Those insulating graphite oxide films were deposited on SiO2/Si substrates and reduced to semiconducting graphene. Field effect transistors of these graphite oxide and graphene films were fabricated. The transport properties of the devices were studied before and after the reduction reaction. Such method opens up the possibility of preparing high quality, large area and manufacturable graphene films with low cost.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84464554","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601315
Bin Chen, Xianghe Peng, S. Sun
The microstructure of a Lucanidae cuticle was observed with a scanning electronic microscope (SEM). It was found that the insect cuticle is a kind of bio composite consisting of nanometer chitin fibers and sclerotic-protein matrix. There is a kind of isogonic nano-chitin-fiber structure in the cuticle, in which the fibers in different layers have different orientations, which may improve the fracture toughness of the cuticle. The maximum pullout force of the isogonic nano-chitin-fiber structure was analyzed and compared with that of the conventional parallel-fiber structure based on their representative volume element. It showed that the maximum pullout force of the isogonic nano-chitin-fiber structure is markedly larger than that of the conventional parallel-fiber structure. A comparative experiment on the maximum pullout forces of the isogonic-fiber and the parallel-fiber structures was conducted. Comparison shows that the analytical results agree well with the experimental results.
{"title":"Investigation to isogonic nano-chitin-fiber structure in Lucanidae cuticle","authors":"Bin Chen, Xianghe Peng, S. Sun","doi":"10.1109/NANO.2007.4601315","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601315","url":null,"abstract":"The microstructure of a Lucanidae cuticle was observed with a scanning electronic microscope (SEM). It was found that the insect cuticle is a kind of bio composite consisting of nanometer chitin fibers and sclerotic-protein matrix. There is a kind of isogonic nano-chitin-fiber structure in the cuticle, in which the fibers in different layers have different orientations, which may improve the fracture toughness of the cuticle. The maximum pullout force of the isogonic nano-chitin-fiber structure was analyzed and compared with that of the conventional parallel-fiber structure based on their representative volume element. It showed that the maximum pullout force of the isogonic nano-chitin-fiber structure is markedly larger than that of the conventional parallel-fiber structure. A comparative experiment on the maximum pullout forces of the isogonic-fiber and the parallel-fiber structures was conducted. Comparison shows that the analytical results agree well with the experimental results.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79512441","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601300
P. Paliwoda, D.S. Maragal, G. Rose
Molecular electronics may improve the speed and density of circuits as the limitations of CMOS become more stringent. However, due to the difficulties in manufacturing molecular circuits, it may be beneficial to use a hybrid model initially, composed of both molecular and CMOS components. The molecular feature size of such devices can yield high density memory applications, which are expected to reach 1011 b/cm2. The defect rate in such systems is expected to be 10%, which still makes it an attractive technology due to overhead. The goal of this paper is to investigate techniques of detecting defects within molecular electronic structures. Essentially, the proposed techniques will lead to systems that are self-healing with minimal loss of memory improving the reliability and the utility of the manufactured memory.
{"title":"Testing molecular devices in CMOS/nano integrated circuits","authors":"P. Paliwoda, D.S. Maragal, G. Rose","doi":"10.1109/NANO.2007.4601300","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601300","url":null,"abstract":"Molecular electronics may improve the speed and density of circuits as the limitations of CMOS become more stringent. However, due to the difficulties in manufacturing molecular circuits, it may be beneficial to use a hybrid model initially, composed of both molecular and CMOS components. The molecular feature size of such devices can yield high density memory applications, which are expected to reach 1011 b/cm2. The defect rate in such systems is expected to be 10%, which still makes it an attractive technology due to overhead. The goal of this paper is to investigate techniques of detecting defects within molecular electronic structures. Essentially, the proposed techniques will lead to systems that are self-healing with minimal loss of memory improving the reliability and the utility of the manufactured memory.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81753119","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601376
K. Jiang, Lihong Cheng, L. Zheng, Zheng Yao, Guorong Li, Q. Yin
Nanofillers in epoxy composites sometimes results in unexpected properties. Presented in this paper are some findings on the dielectric properties of diglycidyl ether of bisphenol-A (DGEBA) epoxy resin incorporated with surface modified nanosilica particles. 20 nm particles were used in the investigation and the results were compared with those of 100 nm silica composite. The composites were examined under infrared spectroscopy and XRD and it was found that the surface modification of the nanoparticles lead to a good hydrophobic property and made particles easier to form bonds with the resin. The measurements of the dielectric properties of the composites showed that by adding low dielectric constant nanosilica particles, the dielectric constants of the composite were notably increased as opposed to a drop as one might expect, while the dielectric losses were lowered. The increase phenomenon in dielectric constant is explained in terms of water molecules existence in the composites produced during the process.
{"title":"The unique dielectric behaviour of nanosilica epoxy composites","authors":"K. Jiang, Lihong Cheng, L. Zheng, Zheng Yao, Guorong Li, Q. Yin","doi":"10.1109/NANO.2007.4601376","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601376","url":null,"abstract":"Nanofillers in epoxy composites sometimes results in unexpected properties. Presented in this paper are some findings on the dielectric properties of diglycidyl ether of bisphenol-A (DGEBA) epoxy resin incorporated with surface modified nanosilica particles. 20 nm particles were used in the investigation and the results were compared with those of 100 nm silica composite. The composites were examined under infrared spectroscopy and XRD and it was found that the surface modification of the nanoparticles lead to a good hydrophobic property and made particles easier to form bonds with the resin. The measurements of the dielectric properties of the composites showed that by adding low dielectric constant nanosilica particles, the dielectric constants of the composite were notably increased as opposed to a drop as one might expect, while the dielectric losses were lowered. The increase phenomenon in dielectric constant is explained in terms of water molecules existence in the composites produced during the process.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82273853","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601255
F. C. Soumetz, L. Pastorino, C. Ruggiero
Nanometer-sized structures have been found to interact with cell function and development. In tissue engineering, the fabrication of bioactive devices which mimic physiologic conditions has a key role in eliciting specific cellular responses and in guaranteeing long term success of implants. To this regard the layer by layer (LBL) self assembly technique is an efficient method to develop nanostructured thin films. This technique was used to assemble biomimetic coatings containing fibronectin, an adhesive glycoprotein of the extracellular matrix (ECM). The deposited films were then tested for the response of a line of human osteoblast-like cells in order to evaluate their potential for bone tissue repair purposes. The assembled films resulted to be effective in improving cell adhesion and proliferation. Therefore, this technique shows a high potential for the optimization of the surface properties of biomaterials.
{"title":"Osteoblast-like cells response to layer by layer self assembled biomimetic coatings","authors":"F. C. Soumetz, L. Pastorino, C. Ruggiero","doi":"10.1109/NANO.2007.4601255","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601255","url":null,"abstract":"Nanometer-sized structures have been found to interact with cell function and development. In tissue engineering, the fabrication of bioactive devices which mimic physiologic conditions has a key role in eliciting specific cellular responses and in guaranteeing long term success of implants. To this regard the layer by layer (LBL) self assembly technique is an efficient method to develop nanostructured thin films. This technique was used to assemble biomimetic coatings containing fibronectin, an adhesive glycoprotein of the extracellular matrix (ECM). The deposited films were then tested for the response of a line of human osteoblast-like cells in order to evaluate their potential for bone tissue repair purposes. The assembled films resulted to be effective in improving cell adhesion and proliferation. Therefore, this technique shows a high potential for the optimization of the surface properties of biomaterials.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80811709","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601273
S. Fardad, R. Massudi
Effects of liquid surrounding on production, initial size, colloidal stability and optical properties of zinc and zinc oxide nanoparticles, synthesized by pulsed laser ablation method in different liquid environments are studied. In this work, Zn and ZnO nanoparticles were produced by 532 nm harmonic of a Nd:YAG laser ablation of a pure zinc metal target in different aqueous solutions of deionized water, ethanol and sodium hydroxide with various concentrations and pH. It was found that by changing the pH and temperature of the environment, the structure, size, and stability of the colloidal nanoparticles changed. The particles produced using low ablation energies in NaOH solutions with 510 were ZnO and Zn respectively. On the other hand, by increasing the temperature from 0 degC to 60 degC, larger particles were produced and their colloid was more stable. For characterizing nano-particle optical properties, structure, size and growth; UV-VIS absorbance and FTIR spectroscopy, and XRD were employed.
{"title":"Environment effect on structure, size control and stability of Zn and ZnO nanoparticles","authors":"S. Fardad, R. Massudi","doi":"10.1109/NANO.2007.4601273","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601273","url":null,"abstract":"Effects of liquid surrounding on production, initial size, colloidal stability and optical properties of zinc and zinc oxide nanoparticles, synthesized by pulsed laser ablation method in different liquid environments are studied. In this work, Zn and ZnO nanoparticles were produced by 532 nm harmonic of a Nd:YAG laser ablation of a pure zinc metal target in different aqueous solutions of deionized water, ethanol and sodium hydroxide with various concentrations and pH. It was found that by changing the pH and temperature of the environment, the structure, size, and stability of the colloidal nanoparticles changed. The particles produced using low ablation energies in NaOH solutions with 5<pH<10 and pH>10 were ZnO and Zn respectively. On the other hand, by increasing the temperature from 0 degC to 60 degC, larger particles were produced and their colloid was more stable. For characterizing nano-particle optical properties, structure, size and growth; UV-VIS absorbance and FTIR spectroscopy, and XRD were employed.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83233421","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601169
Niraj Sinha, J. Yeow, D. A. Jaffray
For biomedical applications, tomographic imaging of objects in rapid motion requires high speed and high temporal resolution. It has been found that a multipixel carbon nanotube (CNT) based field emission X-ray source can produce spatially and temporally modulated radiations. When a multi-pixel configuration is used, crosstalk (leaking of current from one pixel to the neighboring pixel) comes into picture. In order to achieve good image quality, the crosstalk should be negligible. We report a study on the crosstalk phenomenon in a multi-pixel CNT array. The study will help in improving the imaging capability of computed tomography (CT) scanner.
{"title":"Experimental investigation of the crosstalk phenomenon and current stability in a carbon nanotube array","authors":"Niraj Sinha, J. Yeow, D. A. Jaffray","doi":"10.1109/NANO.2007.4601169","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601169","url":null,"abstract":"For biomedical applications, tomographic imaging of objects in rapid motion requires high speed and high temporal resolution. It has been found that a multipixel carbon nanotube (CNT) based field emission X-ray source can produce spatially and temporally modulated radiations. When a multi-pixel configuration is used, crosstalk (leaking of current from one pixel to the neighboring pixel) comes into picture. In order to achieve good image quality, the crosstalk should be negligible. We report a study on the crosstalk phenomenon in a multi-pixel CNT array. The study will help in improving the imaging capability of computed tomography (CT) scanner.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83412466","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601205
A. Chaudhry, M.S. Islam
Single crystal Si nanowires are grown between highly doped prefabricated silicon electrodes in the form of nano bridges. Resistance values extracted from the current-voltage measurements for a large number of the nano-bridges with varying lengths and diameters are used to propose a model which highlights the relative contribution of the contact resistance to the total resistance for nanowire based devices. We estimate the specific contact resistance based on our empirical model to be in the range 3.74times10-6 - 5.02times10-6 Omega-cm2 for our epitaxially interfaced Si nano-bridges. This value is almost two orders of magnitude lower than that of previously reported contact made to silicon nanowires with an evaporated metal film.
{"title":"Contact resistance of epitaxially interfaced bridged silicon nanowires","authors":"A. Chaudhry, M.S. Islam","doi":"10.1109/NANO.2007.4601205","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601205","url":null,"abstract":"Single crystal Si nanowires are grown between highly doped prefabricated silicon electrodes in the form of nano bridges. Resistance values extracted from the current-voltage measurements for a large number of the nano-bridges with varying lengths and diameters are used to propose a model which highlights the relative contribution of the contact resistance to the total resistance for nanowire based devices. We estimate the specific contact resistance based on our empirical model to be in the range 3.74times10-6 - 5.02times10-6 Omega-cm2 for our epitaxially interfaced Si nano-bridges. This value is almost two orders of magnitude lower than that of previously reported contact made to silicon nanowires with an evaporated metal film.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82623181","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601377
P. Civalleri, M. Gilli, M. Bonnin
A two-state open quantum system composed of identical noninteracting particles, excited by a sinusoidal TEM electromagnetic wave and in contact with a thermal bath of an infinite thermal capacitance, is considered as a model for a typical nano circuit component working under linear conditions. Its steady state performance can be analyzed to any degree of accuracy by the Harmonic Balance Technique. It is shown that the power delivered to the bath, which in turn influences the small signal active performance, only depends on the even harmonics. This is the basis for implementing improved equivalent circuits.
{"title":"Frequency domain analysis of open two-state quantum systems","authors":"P. Civalleri, M. Gilli, M. Bonnin","doi":"10.1109/NANO.2007.4601377","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601377","url":null,"abstract":"A two-state open quantum system composed of identical noninteracting particles, excited by a sinusoidal TEM electromagnetic wave and in contact with a thermal bath of an infinite thermal capacitance, is considered as a model for a typical nano circuit component working under linear conditions. Its steady state performance can be analyzed to any degree of accuracy by the Harmonic Balance Technique. It is shown that the power delivered to the bath, which in turn influences the small signal active performance, only depends on the even harmonics. This is the basis for implementing improved equivalent circuits.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80949676","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}
Pub Date : 2007-08-01DOI: 10.1109/NANO.2007.4601253
R. Yu, Hualing Chen, Tianning Chen, Xiangyang Zhou
This paper presents a mathematical model for three-dimensional biodegradable multi-layer drug delivery microstructure with large array of micro-chambers. The simultaneous release of multiple drugs from this type of drug delivery microstructure is modeled using cellular automata (CA) and discrete iterations. The model can describe the dynamic behavior of drug release. Furthermore, simulations about this type of drug delivery microstructure enclosed two drugs are carried out. The simulation results show that the introduced mathematical model can act as the basis of a new optimal design methodology for three-dimensional biodegradable multi-layer drug delivery microstructure.
{"title":"Modeling the drug release from 3D multi-layer microstructure with micro-chambers","authors":"R. Yu, Hualing Chen, Tianning Chen, Xiangyang Zhou","doi":"10.1109/NANO.2007.4601253","DOIUrl":"https://doi.org/10.1109/NANO.2007.4601253","url":null,"abstract":"This paper presents a mathematical model for three-dimensional biodegradable multi-layer drug delivery microstructure with large array of micro-chambers. The simultaneous release of multiple drugs from this type of drug delivery microstructure is modeled using cellular automata (CA) and discrete iterations. The model can describe the dynamic behavior of drug release. Furthermore, simulations about this type of drug delivery microstructure enclosed two drugs are carried out. The simulation results show that the introduced mathematical model can act as the basis of a new optimal design methodology for three-dimensional biodegradable multi-layer drug delivery microstructure.","PeriodicalId":6415,"journal":{"name":"2007 7th IEEE Conference on Nanotechnology (IEEE NANO)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81001645","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}
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