Pub Date : 2013-08-01DOI: 10.1109/NANO.2013.6720899
Shunhang Zhou, Yangmin Li
In this paper, a matrix equation method, a dimension-reduce then dimension-increase matrix method is proposed to model leverage structure and closed-loop structure of compliant mechanism, respectively. The accuracy of the methods is validated by finite-element analysis (EFA).
{"title":"Analysis of a compliant mechanism with leverage and closed-loop structure based on matrix dimension-reduce method","authors":"Shunhang Zhou, Yangmin Li","doi":"10.1109/NANO.2013.6720899","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720899","url":null,"abstract":"In this paper, a matrix equation method, a dimension-reduce then dimension-increase matrix method is proposed to model leverage structure and closed-loop structure of compliant mechanism, respectively. The accuracy of the methods is validated by finite-element analysis (EFA).","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115384085","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 : 2013-08-01DOI: 10.1109/NANO.2013.6720943
H. Arava, H. Fang, Lulu Zhang, Jacob Hill, G. Liang
Due to its high thermal stability, low cost and high theoretical charge capacity, LiFePO4 has emerged as one of the most promising cathode materials for large-scale lithium ion batteries. In this work, we systematically investigated the effect on structure and electrochemical properties brought by W doping on Fe site of LiFePO4. LiFe1-yWyPO4 (y = 0. 0.01, 0.02, 0.03) samples with carbon coating were prepared by using solid-state reaction. The phase and structure of as prepared powders were characterized by X-ray diffraction. Cycling charge and discharge measurement at various C-rates, cyclic voltammetry and electrochemical impedance spectroscopy were employed to reveal the electrochemical properties. Results showed that carbon coating dramatically improved the capacity at fast C-rate. The sample with 2% W doping and carbon coating was observed to have the highest charge capacity of 146 mAhg-1 at 0.1C and 110 mAhg-1 at 1C.
{"title":"Electrochemical studies of carbon coated LiFePO4 doped with tungsten","authors":"H. Arava, H. Fang, Lulu Zhang, Jacob Hill, G. Liang","doi":"10.1109/NANO.2013.6720943","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720943","url":null,"abstract":"Due to its high thermal stability, low cost and high theoretical charge capacity, LiFePO4 has emerged as one of the most promising cathode materials for large-scale lithium ion batteries. In this work, we systematically investigated the effect on structure and electrochemical properties brought by W doping on Fe site of LiFePO4. LiFe1-yWyPO4 (y = 0. 0.01, 0.02, 0.03) samples with carbon coating were prepared by using solid-state reaction. The phase and structure of as prepared powders were characterized by X-ray diffraction. Cycling charge and discharge measurement at various C-rates, cyclic voltammetry and electrochemical impedance spectroscopy were employed to reveal the electrochemical properties. Results showed that carbon coating dramatically improved the capacity at fast C-rate. The sample with 2% W doping and carbon coating was observed to have the highest charge capacity of 146 mAhg-1 at 0.1C and 110 mAhg-1 at 1C.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115679197","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 : 2013-08-01DOI: 10.1109/NANO.2013.6720826
P. Tran, B. Wolfrum, R. Stockmann, A. Offenhausser, B. Thierry
We present a robust wafer-scale top-down process for the fabrication of locally thinned-downed silicon nanowire (SiNW) devices. The fabrication is based on electron-beam lithography in combination with a two-step tetramethylammonium hydroxide (TMAH) wet etch. We optimized the etching profile of the TMAH process on silicon-on-insulator <;100> using isopropanol additive and temperature regulation, yielding very low and controllable etching rates and enabling the formation of ultra-smooth silicon morphology. The optimized TMAH etching process was confined using photolithography to the middle sections of silicon nanowire channels to achieve localized step-etching of the nanowires. The thinned silicon nanowires were addressed via metal contact lines in the final step of the fabrication. Preliminary current-voltage characterization in liquid demonstrated a p-channel field effect transistor behavior in depletion mode with a very high output current and negligible contact resistance. The proposed process provides an alternative route for reliable and reproducible fabrication of ultra-thin silicon nanowire devices.
{"title":"Wafer-scale fabrication of ultra-thin silicon nanowire devices","authors":"P. Tran, B. Wolfrum, R. Stockmann, A. Offenhausser, B. Thierry","doi":"10.1109/NANO.2013.6720826","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720826","url":null,"abstract":"We present a robust wafer-scale top-down process for the fabrication of locally thinned-downed silicon nanowire (SiNW) devices. The fabrication is based on electron-beam lithography in combination with a two-step tetramethylammonium hydroxide (TMAH) wet etch. We optimized the etching profile of the TMAH process on silicon-on-insulator <;100> using isopropanol additive and temperature regulation, yielding very low and controllable etching rates and enabling the formation of ultra-smooth silicon morphology. The optimized TMAH etching process was confined using photolithography to the middle sections of silicon nanowire channels to achieve localized step-etching of the nanowires. The thinned silicon nanowires were addressed via metal contact lines in the final step of the fabrication. Preliminary current-voltage characterization in liquid demonstrated a p-channel field effect transistor behavior in depletion mode with a very high output current and negligible contact resistance. The proposed process provides an alternative route for reliable and reproducible fabrication of ultra-thin silicon nanowire devices.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114536270","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 : 2013-08-01DOI: 10.1109/NANO.2013.6720831
Nan Zheng, Mahdi Aghadjani, Kyungjun Song, P. Mazumder
Three high-sensitivity metamaterial Terahertz DNA sensors based on resonance are proposed to distinguish DNA molecule with different refractive indices. Both numerical electromagnetic method and physical circuit model interpretation are employed to analyze proposed sensor structures. Design guideline based on intuitive physical circuit model is provided and verified through full-wave simulation.
{"title":"Metamaterial sensor platforms for Terahertz DNA sensing","authors":"Nan Zheng, Mahdi Aghadjani, Kyungjun Song, P. Mazumder","doi":"10.1109/NANO.2013.6720831","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720831","url":null,"abstract":"Three high-sensitivity metamaterial Terahertz DNA sensors based on resonance are proposed to distinguish DNA molecule with different refractive indices. Both numerical electromagnetic method and physical circuit model interpretation are employed to analyze proposed sensor structures. Design guideline based on intuitive physical circuit model is provided and verified through full-wave simulation.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114925554","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 : 2013-08-01DOI: 10.1109/NANO.2013.6721029
H. Tajima, M. Nakajima, T. Fukuda
The technique to construct the artificial organ made of cultured cells is required in many fields such as tissue engineering and drug development. However, the tissue-like construction more than 200 μm thick has central hypoxia and results in necrosis because of the limitation of diffusion of materials. Then, we will propose a method to form a tissue-like construction including vascular network in itself. Biocompatible artificial vessel was wrapped in cell-sheet cocultivated with HUVEC and NIH3T3. Culture medium perfused into the artificial vessel will be diffused into the whole construction through vascular network of HUVEC. This technique will be increases the viability of the cells in the construction.
{"title":"Self-assembly of capillary network inside artificial hollow tissue","authors":"H. Tajima, M. Nakajima, T. Fukuda","doi":"10.1109/NANO.2013.6721029","DOIUrl":"https://doi.org/10.1109/NANO.2013.6721029","url":null,"abstract":"The technique to construct the artificial organ made of cultured cells is required in many fields such as tissue engineering and drug development. However, the tissue-like construction more than 200 μm thick has central hypoxia and results in necrosis because of the limitation of diffusion of materials. Then, we will propose a method to form a tissue-like construction including vascular network in itself. Biocompatible artificial vessel was wrapped in cell-sheet cocultivated with HUVEC and NIH3T3. Culture medium perfused into the artificial vessel will be diffused into the whole construction through vascular network of HUVEC. This technique will be increases the viability of the cells in the construction.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116329527","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 : 2013-08-01DOI: 10.1109/NANO.2013.6720912
Wenjun Zhang, Peng-Fei Nan, B. Lu, Yifang Chen, P. Vadgama, X. Qu
The tunable silver nano-pillar arrays were fabricated by using Electron Beam Lithography and direct current magnetron sputtering technique successfully. The as-prepared substrates retain an excellent Raman-enhancement characteristic. The developed process provides a reproducible and reliable method to fabricate the Surface-enhanced Raman Scattering substrate particularly for the high sensitivity biological detections.
{"title":"Silver surface-enhanced raman scattering substrates prepared by a nanofabrication process using Electron Beam Lithography and magnetron sputtering","authors":"Wenjun Zhang, Peng-Fei Nan, B. Lu, Yifang Chen, P. Vadgama, X. Qu","doi":"10.1109/NANO.2013.6720912","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720912","url":null,"abstract":"The tunable silver nano-pillar arrays were fabricated by using Electron Beam Lithography and direct current magnetron sputtering technique successfully. The as-prepared substrates retain an excellent Raman-enhancement characteristic. The developed process provides a reproducible and reliable method to fabricate the Surface-enhanced Raman Scattering substrate particularly for the high sensitivity biological detections.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132469653","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 : 2013-08-01DOI: 10.1109/NANO.2013.6720935
F. Brunetti, G. Ulisse, C. Ciceroni, F. Ricci, F. Gemma, M. Dispenza, A. Fiorello, A. Di Carlo
In this work we present the development of a Carbon Nanotubes based multifinger microtriodes. Such device represents a viable and optimized alternative to the standard Spindt-type microtriode. The main improvement of the multifinger geometry consists on the possibility to reduce the cathode-grid capacitance by reducing the overlap between the two electrodes using a parallel patterning of the metallic lines. This approach allows doubling the cut-off frequency of the devices with respect to the Spindt-type triode. The prototype multifinger triode has been realized and field emission properties have been measured.
{"title":"Field emission triode in a multifinger configuration with carbon nanotubes emitters","authors":"F. Brunetti, G. Ulisse, C. Ciceroni, F. Ricci, F. Gemma, M. Dispenza, A. Fiorello, A. Di Carlo","doi":"10.1109/NANO.2013.6720935","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720935","url":null,"abstract":"In this work we present the development of a Carbon Nanotubes based multifinger microtriodes. Such device represents a viable and optimized alternative to the standard Spindt-type microtriode. The main improvement of the multifinger geometry consists on the possibility to reduce the cathode-grid capacitance by reducing the overlap between the two electrodes using a parallel patterning of the metallic lines. This approach allows doubling the cut-off frequency of the devices with respect to the Spindt-type triode. The prototype multifinger triode has been realized and field emission properties have been measured.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130450820","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 : 2013-08-01DOI: 10.1109/NANO.2013.6720997
Bum-Joon Kim, Jung-Sik Kim
In this study, a highly sensitive hydrogen gas sensor of the multi-layer and micro-heater type was designed and fabricated using a microelectromechanical system (MEMS) process. The sensing layer of palladium deposited in the middle of the sensor platform was modified to be a nano-bumpy structure using nanosized polystyrene beads. The root-mean square roughness measured by AFM was 9.07 nm for the nano-bumpy Pd structure whereas that of the simple Pd thin film was 0.98 nm. At hydrogen gas concentration of 2,000 ppm, the sensitivity of the simple Pd thin film and the Pd nano-bumpy film was 0.638 and 1.045, respectively. The sensitivity of the Pd nano-bumpy film was much higher than that of the Pd thin film due to the very high surface-to-volume ratio of the nano-bumpy Pd structure.
{"title":"Highly sensitive hydrogen sensor with a nano bumpy structured Pd film","authors":"Bum-Joon Kim, Jung-Sik Kim","doi":"10.1109/NANO.2013.6720997","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720997","url":null,"abstract":"In this study, a highly sensitive hydrogen gas sensor of the multi-layer and micro-heater type was designed and fabricated using a microelectromechanical system (MEMS) process. The sensing layer of palladium deposited in the middle of the sensor platform was modified to be a nano-bumpy structure using nanosized polystyrene beads. The root-mean square roughness measured by AFM was 9.07 nm for the nano-bumpy Pd structure whereas that of the simple Pd thin film was 0.98 nm. At hydrogen gas concentration of 2,000 ppm, the sensitivity of the simple Pd thin film and the Pd nano-bumpy film was 0.638 and 1.045, respectively. The sensitivity of the Pd nano-bumpy film was much higher than that of the Pd thin film due to the very high surface-to-volume ratio of the nano-bumpy Pd structure.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123157296","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 : 2013-08-01DOI: 10.1109/NANO.2013.6721052
S. Lam, M. Chan
The effect of parasitic capacitances and resistances on RF performance is investigated for a recently reported 30-nm transistor with regrown source and drain structure which is to reduce the access resistance in nanoscale MOSFETs. The relatively large lateral parasitic capacitances from the gate electrode to the regrown source and drain regions are quantitatively determined to estimate their impact on the transistor's RF performance. The current gain cut-off frequency fT of such a transistor is estimated to be about 320 GHz using small-signal equivalent circuit model calculations. With the significantly reduced parasitic series resistances due to the regrown source and drain structures, the maximum frequency of oscillation fmax can attain up to 530 GHz. The parasitic circuit elements are identified to have varying degree of impact on the RF performance. This brings important implication in the device design and structure optimization in nanoscale transistors for RF applications.
{"title":"Effect of parasitic capacitances and resistances on the RF performance of nanoscale MOSFETs","authors":"S. Lam, M. Chan","doi":"10.1109/NANO.2013.6721052","DOIUrl":"https://doi.org/10.1109/NANO.2013.6721052","url":null,"abstract":"The effect of parasitic capacitances and resistances on RF performance is investigated for a recently reported 30-nm transistor with regrown source and drain structure which is to reduce the access resistance in nanoscale MOSFETs. The relatively large lateral parasitic capacitances from the gate electrode to the regrown source and drain regions are quantitatively determined to estimate their impact on the transistor's RF performance. The current gain cut-off frequency fT of such a transistor is estimated to be about 320 GHz using small-signal equivalent circuit model calculations. With the significantly reduced parasitic series resistances due to the regrown source and drain structures, the maximum frequency of oscillation fmax can attain up to 530 GHz. The parasitic circuit elements are identified to have varying degree of impact on the RF performance. This brings important implication in the device design and structure optimization in nanoscale transistors for RF applications.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123318565","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 : 2013-08-01DOI: 10.1109/NANO.2013.6720931
T. Wang, S. Korposh, S. James, R. Tatam, S-W Lee
The formation of poly(acrylic acid), PAA, -anchored polyelectrolyte multilayers on an optical fibre long period grating (LPG) by the layer-by-layer (LbL) assembly technique for highly sensitive ammonia gas detection is reported. PAA could act as a receptor for binding of amine compounds, especially ammonia, which would induce changes in the coating properties such as optical thickness (OT), film thickness/density and electrostatic interaction, thus influencing the transmission spectrum of the LPG. The ammonia binding is based on the acid-base interaction to free carboxylic acid groups of PAA. Film morphology and thickness changes due to the binding of ammonia gas, explaining the sensing mechanism, were confirmed through atomic force microscopic (AFM) measurements.
{"title":"Polyelectrolyte multilayer nanothin film coated long period grating fiber optic sensors for ammonia gas sensing","authors":"T. Wang, S. Korposh, S. James, R. Tatam, S-W Lee","doi":"10.1109/NANO.2013.6720931","DOIUrl":"https://doi.org/10.1109/NANO.2013.6720931","url":null,"abstract":"The formation of poly(acrylic acid), PAA, -anchored polyelectrolyte multilayers on an optical fibre long period grating (LPG) by the layer-by-layer (LbL) assembly technique for highly sensitive ammonia gas detection is reported. PAA could act as a receptor for binding of amine compounds, especially ammonia, which would induce changes in the coating properties such as optical thickness (OT), film thickness/density and electrostatic interaction, thus influencing the transmission spectrum of the LPG. The ammonia binding is based on the acid-base interaction to free carboxylic acid groups of PAA. Film morphology and thickness changes due to the binding of ammonia gas, explaining the sensing mechanism, were confirmed through atomic force microscopic (AFM) measurements.","PeriodicalId":189707,"journal":{"name":"2013 13th IEEE International Conference on Nanotechnology (IEEE-NANO 2013)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122573317","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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