By Topic

Nanotechnology, 2007. IEEE-NANO 2007. 7th IEEE Conference on

Date 2-5 Aug. 2007

Filter Results

Displaying Results 1 - 25 of 309
  • Index of authors

    Publication Year: 2007 , Page(s): i - x
    Save to Project icon | Request Permissions | PDF file iconPDF (1439 KB)  
    Freely Available from IEEE
  • Technical and financial sponsors

    Publication Year: 2007 , Page(s): xi - lxxx
    Save to Project icon | Request Permissions | PDF file iconPDF (4927 KB)  
    Freely Available from IEEE
  • IEEE-NANO 2007 program

    Publication Year: 2007 , Page(s): lxxxi - lxxxii
    Save to Project icon | Request Permissions | PDF file iconPDF (314 KB)  
    Freely Available from IEEE
  • Table of contents

    Publication Year: 2007 , Page(s): lxxxiii - c
    Save to Project icon | Request Permissions | PDF file iconPDF (989 KB)  
    Freely Available from IEEE
  • 2007 7th IEEE international conference on nanotechnology

    Publication Year: 2007 , Page(s): c1
    Save to Project icon | Request Permissions | PDF file iconPDF (668 KB)  
    Freely Available from IEEE
  • Welcome message

    Publication Year: 2007 , Page(s): ci
    Save to Project icon | Request Permissions | PDF file iconPDF (216 KB) |  | HTML iconHTML  
    Freely Available from IEEE
  • DEP-based fabrication and characterization of electronic-grade CNTs for nano-sensing applications

    Publication Year: 2007 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1572 KB) |  | HTML iconHTML  

    Sensing devices using electronic-grade carbon nanotubes (EG-CNTs) as resistive sensing element were fabricated by dielectrophoresis (DEP) manipulation. DEP-based fabrication of EG-CNTs is important as it allows some control of the nominal resistance of the fabricated sensors, which is essential to improve the SNR of CNT sensors. The devices were characterized and the potential of EG-CNTs to serve as a novel temperature and humidity sensing element has been demonstrated. Electrical characterization revealed that the EG-CNTs sensors, which exhibit large linear IiquestV range, have both positive and negative TCR at higher operational temperatures. In addition, its resistance-humidity linear dependency proves its humidity sensing capability. Moreover, the EG-CNTs device is capable of operating in nW range. On the foundation of these measurements, we aim to prove EG-CNTs as a promising material for future applications in nano-sensing. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of nanobiotechnology to construct a piezoelectric sensor matrix sensing the flexibility of immunoglobulin

    Publication Year: 2007 , Page(s): 7 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (222 KB) |  | HTML iconHTML  

    We have constructed a piezoelectric sensor matrix with the capability of measuring the flexibility of immunoglobulin. The matrix consisted of 6 independent quartz crystal microbalance (QCM) coated with gold nanoparticles (GNP) of 3.5, 5, 12, 17, and 37 nm, and BSA. The detection was performed simultaneously. Antiserum against GNP bound to QCMs coated with 3.5 nm GNP and maximized for 5 nm GNP-coated QCM. To our best knowledge, this is the first biosensor sensing the topological change and flexibility of biological macromolecule. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rapid production of biocompatible polymeric nanoparticles for functionalization via radio-frequency acoustic atomization

    Publication Year: 2007 , Page(s): 11 - 15
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (752 KB) |  | HTML iconHTML  

    This work demonstrates the use of surface acoustic wave (SAW) atomization together with a nonuniform evaporation and nucleation process to give sub-50-nm diameter monodisperse nanoparticles. SAW atomization is a straightforward and energy efficient technique to generate relatively homogeneous particle size distributions that can be carried out on a chip-scale microdevice for portable drug delivery applications or scaled up for industrial production. It employs technology originally developed for the entirely different purpose of signal filtering and multiplexing, and provides direct control over the size of the particles through adjustment of the operating frequency of the ultrasonic vibration. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nanocavity protein biosensor - fabricated by molecular imprinting

    Publication Year: 2007 , Page(s): 16 - 20
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (387 KB) |  | HTML iconHTML  

    A 'nanocavity' protein biosensor fabricated using the molecular imprinting technique has been developed. We employed microcontact printing to form molecular imprints in a polymer thin-film to act as 'artificial antibodies' for protein recognition. Proteins considered to be important biomarkers in clinical diagnosis were chosen as our templates, namely: Creactive protein, ribonuclease, lysozyme and myoglobin. In order to obtain the best thin-film composition with specific recognition sites, isothermal titration calorimetry was used as an auxiliary tool to examine enthalpy changes among the templates, the functional monomers and the cross-linkers. Nanocavities related to the shape of aggregated template proteins were observed on the imprinted surfaces by using atomic force microscopy (AFM). We found that by optimizing the composition ratio between the lowest affinity cross-linker and the highest affinity functional monomer highly selective recognition sites for a variety of template proteins were able to be formed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrokinetic bio-molecules separation and preconcentration by MWCNTs filter in nanofluidic channel for high sensitive electrochemical detection

    Publication Year: 2007 , Page(s): 21 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (497 KB) |  | HTML iconHTML  

    This paper presents a study of electrokinetic transport in a nano-fluidic chip that allow for separation and pre-concentration of the molecular mixtures into a high density multi-wall carbon nano tubes (MWCNTs) array of nano-channels. The MWCNTs array was used as an induced-surface charge filter to attract the opposite charged molecules on the wall surface by van der Waals and electrostatic force. The surface charge of MWCNTs is inversely proportional to the channel wall thickness and proportional the dielectric constant of itself and the applied external electric-field. A modified RuOx particles MWCNTs electrode was used as electrochemical sensor to increase the reactive surface area and reduce the redox potential for 0.1 muM insulin detection. 0.5 muM FITC (fluorescein) and Rhodamine 6G dye mixtures during the electrokinetic trapping process, could be easily to separate by the electric property of dyes in a MCNTs filter nanochannel, the concentration capability of FITC as high as 5000-10000 folds have been demonstrated. For electrochemical behavior, the RuOx/MWCNTs electrodes could be efficient to reduce about 0.055-0.06V oxide potential compared with MWCNTs only electrodes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A dual-mass MEMS vibratory gyroscope with adaptive control scheme

    Publication Year: 2007 , Page(s): 25 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (215 KB) |  | HTML iconHTML  

    A micromachined vibratory gyroscope with two proof-masses to measure rotation rate is presented. The two proof-masses are driven electrostatically in opposite directions along drive axis to generate differential Coriolis force detection. In order to improve the performance of the MEMS gyroscope, an adaptive control method is developed. This scheme tunes the drive natural frequencies of gyroscope to a given frequency, regulates the amplitudes of the drive axis to a required value, achieves translational acceleration elimination, cancels out quadrature error due to stiffness coupling, and drives the sense axis vibration to zero for dynamic range and precision improvement. Simulation results verify the theoretical analysis. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of a high sensitivity capacitive force sensor

    Publication Year: 2007 , Page(s): 29 - 33
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (563 KB) |  | HTML iconHTML  

    This paper presents the design and development of a MEMS based, capacitive sensor for micro-force measurement. The sensor has an overall dimension of 3600 mum times 1000 mum times 10 mum and was fabricated using the Micragem fabrication process. A displacement reduction mechanism is incorporated in this sensor design to increase the sensitivity of the sensor. Analysis from Finite Element software, COMSOL, confirms that a 10:1 displacement reduction ratio is achievable with this mechanism. Simulation results show that the sensor is capable of measuring a maximum force input of 11 milli-Newton, resulting from a 20-mum displacement on the sensing structure. A 6-DOF manipulator and an evaluation board were used to experimentally verify the performance the sensor. Experimental results show that a capacitance change of approximately 175 to 200 fF can be observed from a 20-mum displacement. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrochemical co-deposition of Nickel-Alumina Nanocomposite for Microsystem Applications

    Publication Year: 2007 , Page(s): 34 - 38
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (739 KB) |  | HTML iconHTML  

    Recently, nanocomposite materials have caught a wide attention due to their excellent properties. In this study, the Nickel-Alumina (Ni-Al2O3) nanocomposite as a new material for high temperature and high stress applications was investigated. Effects of the surfactant, temperature, and current density on the surface morphology, surface roughness, and mechanical property of the electrochemically synthesized nanocomposite were characterized and discussed. Also, Ni-Al2O3 nanocomposite micro components of good qualities were fabricated using optimized conditions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel design methodology for MEMS device

    Publication Year: 2007 , Page(s): 39 - 44
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (354 KB) |  | HTML iconHTML  

    Due to MEMS device needs highly accurate design, a novel design methodology for MEMS device is put forward in this paper. Firstly, top-down and bottom-up hybrid design process based on IP library is proposed. It facilitates and speeds up design cycle and reduces the expense of MEMS design by using IP components which have been successfully implemented. Secondly, virtual fabrication process is proposed. It is used to establish stable, accurate and robust 3D geometry of device according to the fabrication process. Voxel-based visualization technique is applied to virtual fabrication process to achieve better process simulation result. It could help designers achieve highly accurate fabrication process and result. Thirdly, virtual operation is proposed. It is used to visualize and simulate the mechanical operation of MEMS device. This module could exhibit 3D realistic animation in virtual reality (VR) environment. It could help designers achieve highly accurate physical operation characteristic of MEMS device. With the help of virtual fabrication process and virtual operation, intuitive image and realistic animation of MEMS device is exhibited at the design stage. An available prototyping MEMS CAD which implements both top-down and bottom-up design notion integrates with virtual fabrication process and virtual operation. A bimetallic thermally-actuated micropump is studied through the paper using this novel design methodology. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synthesis and transistor performances of high quality single crystalline vapor-liquid-solid grown Si1-xGex nanowire

    Publication Year: 2007 , Page(s): 45 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1712 KB) |  | HTML iconHTML  

    We present a successful synthesis of single crystalline homogeneous Si1-xGex nanowires (diameter: 7~52 nm) via vapor-liquid-solid mechanism. Results show that quality, density, and growth rate of Si1-xGex nanowires are greatly affected by the growth temperature and the single crystalline Si1-xGex nanowires without amorphous sheath layer can be obtained at optimized growth temperature. Control of the amount of Ge in nanowire was obtained with different GeH4 gas flow rates. Using back-gated field effect transistor integrated with HfO2 gate dielectric, TaN/Ta metal gate and Pd source/drain electrode, Si1-xGex nanowire transistor exhibits p-MOS operation with Ion/Ioff~104, sub-threshold swing of 97 mV/dec. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fabrication of lenses for AlGaInP LEDs using Step and Flash Imprint lithography

    Publication Year: 2007 , Page(s): 49 - 52
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (159 KB) |  | HTML iconHTML  

    This paper describes a new data preparation technique, which allows for the design of optical lenses in a conventional CAD package and immediate transfer to a lithographic system, for example Electron Beam or Focused Ion Beam Lithography. Most importantly, we show that this approach could be used to fabricate lens arrays in templates for Step-and Flash Imprint lithography onto 4iquestwafers. One application for this is to enhancing AlGaInP LED performance by texturing the top current spreading layer. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Functionalized multi-walled carbon nanotube coating on mainspring with reinforced mechanical strength

    Publication Year: 2007 , Page(s): 53 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (469 KB) |  | HTML iconHTML  

    Here, we have successfully fabricated high performance mainspring by co-electrodeposition of functionalized multi-walled carbon nanotubes coating in the presence of chitosan. The functionalized multi-walled carbon nanotubes (f-MWCNTs) can be easily electro-deposited with chitosan onto the mainspring under a moderate condition, with controllable film thickness from a few hundred nanometers to tens of micrometers. The Young modulus of the coated mainspring was evaluated by a cantilever loading test. Our results show that the Young modulus of a mainspring coated with a f-MWCNT composite layer has been greatly improved. A 5 pm composite coating on a 100 mum mainspring (implying a 5 increase in the total thickness) can increase the Young modulus, by an average of 41.6%. The reported co-electrodeposition technique provides a facile approach to form stable, reproducible, and rigid f-MWCNTs composite coating, which leads to realization of high-performance mainspring with reinforced mechanical strength. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Structural and optical properties of CuPc/ZnSe multilayer hybrid thin films prepared by electron beam evaporator

    Publication Year: 2007 , Page(s): 58 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (355 KB) |  | HTML iconHTML  

    Multilayer hybrid thin films consisting of alternating layers of organic and inorganic materials were fabricated with powder of copper-phthalocyanine (CuPc) and zinc selenide (ZnSe) by electron beam evaporator. The structural and optical characterization of multilayer hybrid thin film were carried out by using X-ray diffraction (XRD), atomic force microscope (AFM) and UV-Vis absorption spectroscopy. XRD patterns show two peaks of the orientation of (200) plane monoclinic structure in CuPc material and (111) plane cubic structure in ZnSe material where pair numbers of multilayer hybrid thin film higher than two pairs. With the variation in the number of pairs of CuPc/ZnSe, AFM images present almost similar morphology but the optical absorption spectra are significantly changed. Such spectral changes can be interpreted by the effect of the aggregate size and the characteristic of the multilayer hybrid structure. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synthesis of well aligned silicon nanowire arrays by reflow of photoresist techniques

    Publication Year: 2007 , Page(s): 62 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1801 KB) |  | HTML iconHTML  

    Well aligned Si nanowires (SiNWs) by Vapor-Liquid-Solid growth process are presented. Instead of using H2, the current work uses N2 as carrier gas. The growth conditions of SiNWs are controlled by the ratio of nitrogen versus silane gas. Tapering of nanowires was found at T=620degC and P=333 m torr, and the tapering parameter was reduced by increasing the N2 gas. Tapering of nanowires is attributed to volume reduction of Au catalyst which diffuses onto the side wall of nanowires. However, it is found that the N2 gas has a similar effect of O2 gas which can reduce diffusion of Au catalyst so that volume reduction of Au catalyst is not so significant and nanowire growth becomes untapered. By adopting reflow of photoresist techniques, the size of metal catalyst for SiNWs growth can be significantly reduced, and the growth location of SiNWs can be defined. Well aligned Si nanowires can be obtained. However, aspect ratio of the nano size hole in the photoresist after reflow has a significant effect on the amount of the Au in the nanoparticles and thus the quality and growth of the nanowires. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the behaviors of multi-island structure for single-electron threshold logic circuits

    Publication Year: 2007 , Page(s): 66 - 69
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (100 KB) |  | HTML iconHTML  

    This paper investigates the behaviors of multi-island structure as an alternative redundancy scheme for single-electron tunneling (SET) based digital circuits. In particular, we focus on an SET logic gate (2-input NAND gate) to explore the role of this structure in improving the immunity against random background charges. Also discussed are the parameter selection with multi-island structure, and the difference between this structure and the existing redundancy strategy. Experiments using SIMON simulator show the advantages of the proposed structure. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reducing stray currents in molecular memory through data encoding

    Publication Year: 2007 , Page(s): 70 - 75
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB) |  | HTML iconHTML  

    Much progress is being made in the fabrication of molecular devices and nanoscale circuits. Such strides have led to studies and experimental tests using these devices in non-volatile memory arrays. However, the architecture of such arrays makes it difficult to accurately determine the value of each stored bit in the memory. When reading, each bit is effected by the rest of the memory through variable numbers of `stray current pathsiquest. This paper presents the idea of data encoding to thwart the impacts of these stray currents. The results show that this encoding method makes each bit unique and deterministic, independent of the memory array size. Details of the encoding scheme, the hardware design, and layouts are presented throughout this work. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computation of Direct Tunneling gate leakage currents in nano-MOSFETs using ensemble Full Band Monte Carlo with quantum correction

    Publication Year: 2007 , Page(s): 76 - 80
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (318 KB) |  | HTML iconHTML  

    We present the analysis of direct tunneling (DT) gate leakage current in a 25 nm channel length n-channel metal oxide semiconductor field effect transistor MOSFET using an ensemble full band Monte Carlo (FBMC) simulation which incorporates quantum effects using Schrodinger solver. The DT current is simulated and compared with quantum drift diffusion (DD) results using DESSIS. The FBMC simulations yield DT currents one order higher than DD currents. In addition a dual thickness gate oxide structure is simulated using FBMC and DD and found to be effective in reducing the DT current. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A rectangular metal-insulator-metal based nanoscale plasmonic resonator

    Publication Year: 2007 , Page(s): 81 - 84
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (479 KB) |  | HTML iconHTML  

    We present an optical range resonator based on single mode metal-insulator-metal plasmonic gap waveguides. Near lossless transmission at 90deg bends enables us to design rectangular structures with cross-section area less than 500 nm2, which also leads to easing the fabrication process. The resonator exhibits a free spectral range of 270 nm. We show that a small bridge between the resonator and the input waveguide can be used to tune the resonance frequency. In addition, nanoscale add/drop directional couplers are realizable using the presented ring resonator structure. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Clock-free nanowire crossbar architecture based on Null Convention Logic (NCL)

    Publication Year: 2007 , Page(s): 85 - 89
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (94 KB) |  | HTML iconHTML  

    There have been numerous nanowire crossbar architectures proposed till date, although all of them are envisioned to be synchronous (i.e., clocked). The clock is an important part in a circuit and it needs to be connected to all the components to synchronize their operation. Considering non-deterministic nature of nanoscale integration, realizing them on a nano wire crossbar system would be quite cumbersome. Unlike the conventional clocked counterparts, a new clock-free crossbar architecture is proposed to resolve the issues with clocked counterparts in this paper, where the use of clock is eliminated from the architecture. This has been done by implementing delay-insensitive logic encoding technique called Null Convention Logic (NCL). A delay-insensitive full adder has been implemented on the proposed architecture to demonstrate the feasibility in this paper. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.