Pub Date : 2007-04-23DOI: 10.1109/NEMS.2007.352016
S. Promnimit, S. Pratontep, C. Thanachayanonr, J.K. Park, J. Dutta
This work reports on the growth process of multilayer thin films based on layer by layer (LBL) deposition of engineered nanoparticles. The LBL thin films were constructed with zinc sulphide nanoparticles capped with a polyelectrolyte such as chitosan, and gold nanoparticles stabilized by electrostatic charges. The LBL process of self assembly of nanoparticle monolayers & subsequent monoparticulate layered sandwiched units were built on silanized substrates by repeating the self-organization process. The authors discuss tie linear growth of the layers upon multiple dipping, the surface morphology of the obtained films, and the I-V characteristics with increasing film thicknesses.
{"title":"Growth Process of Novel Thin Films by Directed Self Organization of Nanoparticles","authors":"S. Promnimit, S. Pratontep, C. Thanachayanonr, J.K. Park, J. Dutta","doi":"10.1109/NEMS.2007.352016","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352016","url":null,"abstract":"This work reports on the growth process of multilayer thin films based on layer by layer (LBL) deposition of engineered nanoparticles. The LBL thin films were constructed with zinc sulphide nanoparticles capped with a polyelectrolyte such as chitosan, and gold nanoparticles stabilized by electrostatic charges. The LBL process of self assembly of nanoparticle monolayers & subsequent monoparticulate layered sandwiched units were built on silanized substrates by repeating the self-organization process. The authors discuss tie linear growth of the layers upon multiple dipping, the surface morphology of the obtained films, and the I-V characteristics with increasing film thicknesses.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115270979","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}
The cellular force is one of the most important parameters of cellular physiological behavior and mechanical interactions between the cell and its environment which could regulate the cell migration, contractility and gene expression. In order to evidence the characteristics of the physiology and cellular mechanics of the epithelial cells, therefore, we use the micro-pillars arrays (MPAs) to measure the traction force of the Madin-Darby canine kidney (MDCK) cells. When MDCK cells adhere on the different geometry of MPAs, the cell will pull MPAs and cause the pillars displacement due to the traction force. Furthermore, the cellular image and the displacement of the pillars could be analyzed by optic microscope system, and could be evaluated the mechanical interactions between the cells and MPAs. Therefore, this method might help us understand the cellular mechanics and physiological phenomenon between the cells and underlying substrates.
{"title":"Study on the Cell Mechanics of MDCK Cells by Elastic Micro-pillars Arrays","authors":"Chien-Wen Wang, Wei-Ren Chen, Ching-Chou Wu, Hsien-Chang Chang","doi":"10.1109/NEMS.2007.352215","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352215","url":null,"abstract":"The cellular force is one of the most important parameters of cellular physiological behavior and mechanical interactions between the cell and its environment which could regulate the cell migration, contractility and gene expression. In order to evidence the characteristics of the physiology and cellular mechanics of the epithelial cells, therefore, we use the micro-pillars arrays (MPAs) to measure the traction force of the Madin-Darby canine kidney (MDCK) cells. When MDCK cells adhere on the different geometry of MPAs, the cell will pull MPAs and cause the pillars displacement due to the traction force. Furthermore, the cellular image and the displacement of the pillars could be analyzed by optic microscope system, and could be evaluated the mechanical interactions between the cells and MPAs. Therefore, this method might help us understand the cellular mechanics and physiological phenomenon between the cells and underlying substrates.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115693798","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 : 2007-04-23DOI: 10.1109/NEMS.2007.352221
Y. Chu, Ming-Tai Lu, Hsien-Chang Chang
Conductivity detection can be considered electrochemical technique as well but has the ability to detect any analyte irrespective of whether it contains an or not. The authors used MEMS to fabricate the microelectrode. The microchannel was made by PDMS and modified by O2 plasma. In this study the authors detected organic components such as catechol, dopamine, histamine and vitamin C, and inorganic ions like K+, Li+ and Ca2+. In 30 sec electrokinetic injection time for individual sample detection was performed using a field strength (E) of 440 V/cm, and E = 230 V/cm for separation electrophoresis. Each sample can be detected less than 90 sec excluding catechol.
电导率检测也可以被认为是电化学技术，但它具有检测任何分析物的能力，而不管它是否含有苯胺。采用微机电系统(MEMS)制备微电极。采用PDMS制备微通道，O2等离子体修饰微通道。在这项研究中，作者检测了有机成分，如儿茶酚、多巴胺、组胺和维生素C，以及无机离子，如K+、Li+和Ca2+。在30秒的电动注射时间内对单个样品进行检测，使用电场强度(E)为440 V/cm, E = 230 V/cm进行分离电泳。除儿茶酚外，每个样品可在90秒内检测到。
{"title":"Application of Conductometric Capillary Electrophoresis Microchip in Detect Organic and Inorganic Ions","authors":"Y. Chu, Ming-Tai Lu, Hsien-Chang Chang","doi":"10.1109/NEMS.2007.352221","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352221","url":null,"abstract":"Conductivity detection can be considered electrochemical technique as well but has the ability to detect any analyte irrespective of whether it contains an or not. The authors used MEMS to fabricate the microelectrode. The microchannel was made by PDMS and modified by O2 plasma. In this study the authors detected organic components such as catechol, dopamine, histamine and vitamin C, and inorganic ions like K+, Li+ and Ca2+. In 30 sec electrokinetic injection time for individual sample detection was performed using a field strength (E) of 440 V/cm, and E = 230 V/cm for separation electrophoresis. Each sample can be detected less than 90 sec excluding catechol.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114929279","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 : 2007-04-23DOI: 10.1109/NEMS.2007.352210
R. Chuealee, P. Aramwit, T. Srichana
A thermotropic liquid crystals of cholesteryl cetyl carbonate was investigated as a novel nanosystem for delivery of lipophilic drugs. The aims were to synthesize, characterize and develop a formulation for amphotericin B (AmB) in cholesteryl cetyl carbonate liquid crystals. Cholesteryl cetyl carbonate was synthesized and identified by thin layer chromatography (TLC), flash column chromatography, Fourier transformed infrared (FTIR) spectroscopy, mass spectrometry (MS) and Nuclear magnetic resonance spectroscopy (NMR). X-ray diffraction (XRD), transmission electron microscope (TEM), polarized light microscope and differential scanning calorimetry (DSC) were employed to characterize liquid crystals properties. Cholesteryl cetyl carbonate structure is composed of three parts; steroid planar nucleus, hydrocarbon chains and carbonate linkage between the two parts of steroid ring and hydrocarbon chain from fatty alcohol. The phase transition temperatures appeared at around 8 and 36degC and cubic-shaped formation were observed in a micrograph at room temperature. The formulations of AmB in liquid crystals after physical mixing with a sugar revealed high content uniformity and had good characteristics of dry powder forms. It caused low toxicity to red blood cells.
{"title":"Characteristics of Cholesteryl Cetyl Carbonate Liquid Crystals as Drug Delivery Systems","authors":"R. Chuealee, P. Aramwit, T. Srichana","doi":"10.1109/NEMS.2007.352210","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352210","url":null,"abstract":"A thermotropic liquid crystals of cholesteryl cetyl carbonate was investigated as a novel nanosystem for delivery of lipophilic drugs. The aims were to synthesize, characterize and develop a formulation for amphotericin B (AmB) in cholesteryl cetyl carbonate liquid crystals. Cholesteryl cetyl carbonate was synthesized and identified by thin layer chromatography (TLC), flash column chromatography, Fourier transformed infrared (FTIR) spectroscopy, mass spectrometry (MS) and Nuclear magnetic resonance spectroscopy (NMR). X-ray diffraction (XRD), transmission electron microscope (TEM), polarized light microscope and differential scanning calorimetry (DSC) were employed to characterize liquid crystals properties. Cholesteryl cetyl carbonate structure is composed of three parts; steroid planar nucleus, hydrocarbon chains and carbonate linkage between the two parts of steroid ring and hydrocarbon chain from fatty alcohol. The phase transition temperatures appeared at around 8 and 36degC and cubic-shaped formation were observed in a micrograph at room temperature. The formulations of AmB in liquid crystals after physical mixing with a sugar revealed high content uniformity and had good characteristics of dry powder forms. It caused low toxicity to red blood cells.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124909941","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 : 2007-04-23DOI: 10.1109/NEMS.2007.351988
S. Xia
Monolithic ISFET (ion-sensitive field-effect transistor) pH sensor and microelectrode amperometric immunosensor based on the micro fabrication technology have been studied. The Monolithic ISFET sensor, including the differential ISFET/REFET sensing device and the signal-processing circuit integrated on a single chip, was fabricated by standard CMOS and MEMS technology. Polypyrrole were electropolymerized at different voltage on ISFET gate and REFET gate to form ion-sensitive membrane and ion-insensitive membrane. Micro and compatible amperometric immunosensor, composed of micro electrodes and micro reaction pools, was developed by MEMS technology. Bireceptor molecules were immobilized on the sensitive area of the electrode surface by the technology of self-assembled monolayers. The immunosensor was characterized by detection of immunoglobulin G and ¿-fetoprotein. Both kinds of the sensors show attractive advantages, such as miniaturization, compatibility with CMOS techniques, easy to be designed into micro array and enables relatively rapid, reliable and inexpensive field-analysis.
{"title":"Special Invited Lecture: Integrated MEMS Sensors","authors":"S. Xia","doi":"10.1109/NEMS.2007.351988","DOIUrl":"https://doi.org/10.1109/NEMS.2007.351988","url":null,"abstract":"Monolithic ISFET (ion-sensitive field-effect transistor) pH sensor and microelectrode amperometric immunosensor based on the micro fabrication technology have been studied. The Monolithic ISFET sensor, including the differential ISFET/REFET sensing device and the signal-processing circuit integrated on a single chip, was fabricated by standard CMOS and MEMS technology. Polypyrrole were electropolymerized at different voltage on ISFET gate and REFET gate to form ion-sensitive membrane and ion-insensitive membrane. Micro and compatible amperometric immunosensor, composed of micro electrodes and micro reaction pools, was developed by MEMS technology. Bireceptor molecules were immobilized on the sensitive area of the electrode surface by the technology of self-assembled monolayers. The immunosensor was characterized by detection of immunoglobulin G and ¿-fetoprotein. Both kinds of the sensors show attractive advantages, such as miniaturization, compatibility with CMOS techniques, easy to be designed into micro array and enables relatively rapid, reliable and inexpensive field-analysis.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125114015","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 : 2007-04-23DOI: 10.1109/NEMS.2007.352068
W. Chow, M. Wong, W.J. Li, K. Wong
We present a novel fabrication technique to fabricate functionalized CNT sensors rapidly using electrochemical deposition method. The basic fabrication process of this sensor includes fabrication of a gold (Au) microelectrode array by photolithography process, functionalization of multi-walled carbon nanotubes (MWNTs) with carboxylic acid groups (-COOH), and electro-chemical deposition of functionalized MWNTs (f-CNTs) on the Au microelectrode array. The adhesion between the f-CNTs and the Au microelectrodes could be enhanced if CNT sensors are built using the process described in this paper. The I-V characteristics of the sensors were investigated. Our experimental results show that CNT sensors fabricated by electro-chemical process have dramatically different I-V characteristics compared with sensors fabricated by DEP or AFM manipulation techniques. The power limit of the sensors ranges from 0.28mW to 6.21mW, which is much higher than most reported CNT sensors. Self-heating effect can be induced at input power of ~2.2mW. Based on these experimental results, we think that the novel f-CNT sensors should be investigated further for applications in thermal, mechanical, and biomedical systems.
{"title":"Rapid Fabrication of CNT Sensors Using Electro-chemical Deposition of Functionalized CNTs","authors":"W. Chow, M. Wong, W.J. Li, K. Wong","doi":"10.1109/NEMS.2007.352068","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352068","url":null,"abstract":"We present a novel fabrication technique to fabricate functionalized CNT sensors rapidly using electrochemical deposition method. The basic fabrication process of this sensor includes fabrication of a gold (Au) microelectrode array by photolithography process, functionalization of multi-walled carbon nanotubes (MWNTs) with carboxylic acid groups (-COOH), and electro-chemical deposition of functionalized MWNTs (f-CNTs) on the Au microelectrode array. The adhesion between the f-CNTs and the Au microelectrodes could be enhanced if CNT sensors are built using the process described in this paper. The I-V characteristics of the sensors were investigated. Our experimental results show that CNT sensors fabricated by electro-chemical process have dramatically different I-V characteristics compared with sensors fabricated by DEP or AFM manipulation techniques. The power limit of the sensors ranges from 0.28mW to 6.21mW, which is much higher than most reported CNT sensors. Self-heating effect can be induced at input power of ~2.2mW. Based on these experimental results, we think that the novel f-CNT sensors should be investigated further for applications in thermal, mechanical, and biomedical systems.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124347611","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 : 2007-04-23DOI: 10.1109/NEMS.2007.352132
K. Lee, K. Park, K. Koh, Soonil Lee
The authors synthesized high quality ZnO nanorods on Au-and ZnO-coated ITO substrates using a low temperature wet chemical process. Scanning electron microscopy and X-ray diffraction showed that ZnO nanorods were vertically aligned on both type of substrates. Room temperature photoluminescence (PL) measurements showed a strong band-edge emission at ~380 nm for ZnO nanorods on both type of substrates, but substrate-dependent difference was observed in weak and broad visible emissions. Through the careful and systematic analysis of PL spectra, the authors confirmed that the apparent peak at ~760 nm were nothing but the second-order feature of the band-edge emission. Finally, the authors took advantage the selectivity of ZnO-nanorod growth on particular surfaces to demonstrate the possibility for pattered growth.
{"title":"Synthesis of High Quality ZnO Nanorods by Low Temperature Wet Chemical Process","authors":"K. Lee, K. Park, K. Koh, Soonil Lee","doi":"10.1109/NEMS.2007.352132","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352132","url":null,"abstract":"The authors synthesized high quality ZnO nanorods on Au-and ZnO-coated ITO substrates using a low temperature wet chemical process. Scanning electron microscopy and X-ray diffraction showed that ZnO nanorods were vertically aligned on both type of substrates. Room temperature photoluminescence (PL) measurements showed a strong band-edge emission at ~380 nm for ZnO nanorods on both type of substrates, but substrate-dependent difference was observed in weak and broad visible emissions. Through the careful and systematic analysis of PL spectra, the authors confirmed that the apparent peak at ~760 nm were nothing but the second-order feature of the band-edge emission. Finally, the authors took advantage the selectivity of ZnO-nanorod growth on particular surfaces to demonstrate the possibility for pattered growth.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123390939","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 : 2007-04-23DOI: 10.1109/NEMS.2007.352046
B. Stadler, H. Solak, S. Frerker, M. Grandin, J. Voros
We present a platform for the controlled patterning of nano-objects such as gold colloids in the micron and nanorange. We are separating the lithography step from the subsequent functionalization. This has many advantages among them the independence of the linkage chemistry and the lithography process and the possibility to position individual nano-objects. The lithography step is extreme UV interference lithography in the nanorange and standard photolithography in the micron range. As a proof of concept, micro and nanopatterns of single-stranded DNAs are created in an inert background of PLL-g-PEG. The DNA patterns are converted to arrays of DNA-tagged gold colloids by directed self-assembly using the specificity of DNA hybridization. Especially nanoline arrays of gold colloids have the potential to serve as e.g. nanowires for electrical label-free biosensing. In addition, we also present the characterization of the adsorption kinetics of 20 nm DNA-tagged gold colloids via SPR.
{"title":"Nanopatterning with Extreme Ultraviolet Interference Lithography for Nanoelectronics and Biotechnology","authors":"B. Stadler, H. Solak, S. Frerker, M. Grandin, J. Voros","doi":"10.1109/NEMS.2007.352046","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352046","url":null,"abstract":"We present a platform for the controlled patterning of nano-objects such as gold colloids in the micron and nanorange. We are separating the lithography step from the subsequent functionalization. This has many advantages among them the independence of the linkage chemistry and the lithography process and the possibility to position individual nano-objects. The lithography step is extreme UV interference lithography in the nanorange and standard photolithography in the micron range. As a proof of concept, micro and nanopatterns of single-stranded DNAs are created in an inert background of PLL-g-PEG. The DNA patterns are converted to arrays of DNA-tagged gold colloids by directed self-assembly using the specificity of DNA hybridization. Especially nanoline arrays of gold colloids have the potential to serve as e.g. nanowires for electrical label-free biosensing. In addition, we also present the characterization of the adsorption kinetics of 20 nm DNA-tagged gold colloids via SPR.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123437781","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 : 2007-04-23DOI: 10.1109/NEMS.2007.352072
S. Azimi, M. R. Bahmanyar, M. Zolgharni, W. Balachandran
This paper introduces an inductance-based sensor for detection of DNA hybridization and investigates its performance by means of computer simulation. In order to detect the occurrence of hybridization, single strand target DNA's are tagged with magnetic beads. Target DNA's are then exposed to known single strand probe DNA's which are immobilized on a surface in the proximity of a spiral coil with a specific design. After hybridization, the expected variations in the coil inductance due to presence of magnetic beads are studied for different coils as well as magnetic beads of different sizes and permeabilities. The simulation results are presented and discussed in order to obtain optimal coil parameters with the aim of producing maximum variations in the coil inductance.
{"title":"An Inductance-based Sensor for DNA Hybridization Detection","authors":"S. Azimi, M. R. Bahmanyar, M. Zolgharni, W. Balachandran","doi":"10.1109/NEMS.2007.352072","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352072","url":null,"abstract":"This paper introduces an inductance-based sensor for detection of DNA hybridization and investigates its performance by means of computer simulation. In order to detect the occurrence of hybridization, single strand target DNA's are tagged with magnetic beads. Target DNA's are then exposed to known single strand probe DNA's which are immobilized on a surface in the proximity of a spiral coil with a specific design. After hybridization, the expected variations in the coil inductance due to presence of magnetic beads are studied for different coils as well as magnetic beads of different sizes and permeabilities. The simulation results are presented and discussed in order to obtain optimal coil parameters with the aim of producing maximum variations in the coil inductance.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131285571","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 : 2007-04-23DOI: 10.1109/NEMS.2007.352262
Byung-Seon Kong, Hee‐Tae Jung, Sounghee Park, Moon-ki Park
We have developed a simple and practical method to enhance the electrical conductivity of single-walled carbon nanotube (SWNT) films without loss of their transparency. In order to achieve an enhanced conductivity of transparent SWNT films, we carried out the formation of gold nanoparticles through the reduction of gold ions (Au3+) onto the SWNT films which manufactured by the vacuum filtration method. The electroless reduction of gold ions results from redox reactions between Au3+ and SWNT sidewalls just by immersion bare SWNT films into an ethanolic aqueous solution of gold salt (HAuCl4) for several minutes. After the formation of gold nanoparticles, the electrical conductivity increased over two-fold of the initial conductivity and maintained the visible light transmittance ~80 %.
{"title":"Enhancement in Electrical Conductivity of Transparent Single-Walled Carbon Nanotube Films","authors":"Byung-Seon Kong, Hee‐Tae Jung, Sounghee Park, Moon-ki Park","doi":"10.1109/NEMS.2007.352262","DOIUrl":"https://doi.org/10.1109/NEMS.2007.352262","url":null,"abstract":"We have developed a simple and practical method to enhance the electrical conductivity of single-walled carbon nanotube (SWNT) films without loss of their transparency. In order to achieve an enhanced conductivity of transparent SWNT films, we carried out the formation of gold nanoparticles through the reduction of gold ions (Au3+) onto the SWNT films which manufactured by the vacuum filtration method. The electroless reduction of gold ions results from redox reactions between Au3+ and SWNT sidewalls just by immersion bare SWNT films into an ethanolic aqueous solution of gold salt (HAuCl4) for several minutes. After the formation of gold nanoparticles, the electrical conductivity increased over two-fold of the initial conductivity and maintained the visible light transmittance ~80 %.","PeriodicalId":364039,"journal":{"name":"2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128347118","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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