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Electrochemiluminescence detection based on Ruthenium(ii) tris(bipyridine) immobilised in sulfonic-functionalised titania nanoparticles by ion exchange strategy

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ANALYST 2009年第10期134卷 2100-2105页

作者： Li, Yali Yang, Fan Yang, Xiurong Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Electroanalyt Chem Changchun 130022 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China

A novel Ruthenium(ii) tris(bipyridine)-based solid-state electrochemiluminescence (ECL) sensor was developed in this paper. The sensor was fabricated by immobilising tris(2,2'-bipyridyl) ruthenium(ii) (Ru(bpy)(3)(2+)) in sulfonic-functionalised porous titania (TiO2-SO3H) nanoparticles via an ion exchange strategy, followed by employing environment friendly and stable biopolymer chitosan (CHIT) to entrap Ru(bpy)(3)(2+)/TiO2-SO3H onto the ITO electrode. The prepared ECL sensor exhibited excellent ECL behaviors and a wide linear range from 7.5 x 10(-9) to 2.5 x 10(-3) M (R = 0.98) with a detection limit of 1.67 x 10(-10) M (S/N = 3) towards 2-(dibutylamino)-ethanol (DBAE) detection. In addition, it had good reproducibility, and the relative average deviation was 0.95% of ECL intensity-time curve under continuous potential scanning for 34 cycles. It also had good long-term stability for the DBAE detection. After being used in three weeks, the sensor was able to keep over 80% activity towards 2.5 x 10(-4) M of DBAE. Fabrication of the ECL sensor by this method is simple and easy, and hence has potential applications in ECL analysis and detection.

关键词： CHEMILUMINESCENCE BIOCHEMICAL markers ELECTROCHEMICAL sensors BIOPOLYMERS RUTHENIUM NANOPARTICLES TITANIUM dioxide MICROFABRICATION ION exchange (Chemistry)

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applications of a novel cell micropatterning process for long-term neuron and cell culture

Applications of a novel cell micropatterning process for lon...

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TRANSDUCERS 2009 - 15th International Conference on solid-state sensors, Actuators and Microsystems

作者： Chang, W.C. Sretavan, D.W. Departments of Ophthalmology and Physiology Neuroscience and Bioengineering Programs University of California San Francisco CA United States

ISBN: (纸本)9781424441938

We show several applications for a unique method for creating user-friendly, micropatterned substrates for neuron and cell culture. With neurons, we demonstrated that our micropatterns can separate cell bodies and axons while organizing them in orderly arrays for easy experimentation. These micropatterned neuron cultures also persisted for weeks, enabling maturation and development of presynaptic structures and potentially allowing the explicit design of neuronal circuits. Beyond neurons, we also demonstrated the culture of fibroblasts on the patterned substrates and showed that these cell types likewise remained viable and highly compliant to a variety micropatterns. ©2009 IEEE.

关键词： Cell culture

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CMOS-Integrated Stress sensor Systems for Mechanical Sensing and Packaging Reliability Testing

CMOS-Integrated Stress Sensor Systems for Mechanical Sensing...

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Symposium on Microelectromechanical Systems - Materials and Devices ii held at the 2008 MRS Fall Meeting

作者： Paul, Oliver Gieschke, Pascal Lemke, Benjamin Univ Freiburg Dept Microsyst Engn IMTEK D-79110 Freiburg Germany

ISBN: (纸本)9781605111117

This paper presents a selection of microsensors and microsystems based on complementary metal oxide semiconductor technology for measuring mechanical stress and tries to identify some of the next challenges. As the stress acting on the sensors may originate from effects internal or external to the package, the sensors lend themselves for the measurement of (1) time-dependent thermomechanical forces acting on a packaged microchip and (2) external mechanical constraints, i.e., forces and moments. Recently developed applications include tactile sensors, smart brackets, and a solid-state-only joystick with four degrees of freedom, among others. The systems implemented in these applications rely on sensors for in-plane stresses. For packaging testing applications, in addition, sensors for out-of-plane stress components are beneficial. First designs of such new sensors and corresponding results are presented. The calibration of piezoresistive elements is performed on dedicated experimental setups, such as optimized four-point bending and torsional bridges for the application of well-controlled in-plane stresses, and setups in the first stage of their development for the exertion of vertical stress components.

关键词： Degrees of freedom (mechanics)

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Mercury cadmium telluride infrared detector development in India: Status and issues

Mercury cadmium telluride infrared detector development in I...

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Infrared Technology and applications XXXV

作者： Singh, R.N. IRDE Department of Physics Lucknow University Dehra-Dun Lucknow India

ISBN: (纸本)9780819475640

In the present paper, we describe the development of Long Wave Infrared (8-12 μm) linear and 2-D IR FPA detectors using HgCdTe for use in thermal imagers and iiR seekers. In this direction, solid state Physics Laboratory(SSPL) (DRDO) tried to concentrate initially in the bulk growth and characterization of HgCdTe during the early eighties. Some efforts were then made to develop a LWIR photoconductive type MCT array in linear configuration with the IRFPA processed on bulk MCT crystals grown in the laboratory. Non availability of quality epilayers with the required specification followed by the denial of supply of CdTe, CdZnTe and even high purity Te by advanced countries, forced us to shift our efforts during early nineties towards development of 60 element PC IR detectors. High performance linear PC arrays were developed. A novel horizontal casting procedure was evolved for growing high quality bulk material using solid state recrystallization technique. Efforts for ultra purification of Te to 7N purity with the help of a sister concern has made it possible to have this material indigenously. Having succeded in the technology for growing single crystalline CdZnTe with (111) orientation and LPE growth of HgCdTe epilayers on CdZnTe substrates an attempt was made to establish the fabrication of 2D short PV arrays showing significant IR response. Thus a detailed technological knowhow for passivation, metallization, ion implanted junction formation, etc. was generated. Parallel work on the development of a matching CCD Mux readout in silicon by Semiconductor Complex Limited was also completed which was tested first in stand-alone mode followed by integration with IRFPAs through indigenously-developed indium bumps. These devices were integrated into an indigenously fabricated glass dewar cooled by a self-developed JT minicooler. In recent years, the LPE (Liquid Phase Epitaxy) growth from Te-rich route has been standardized for producing epitaxial layers with high composit

关键词： ii-VI semiconductors

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Multispectral EO/IR sensor model for evaluating UV, visible, SWIR, MWIR and LWIR system performance

Multispectral EO/IR sensor model for evaluating UV, visible,...

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Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX

作者： Sood, Ashok K. Richwine, Robert Puri, Yash R. Dhar, Nibir K. Polla, Dennis L. Wijewarnasuriya, Priyalal S. Magnolia Optical Technologies Inc. 52-B Cummings Park Woburn MA 01801 United States DARPA/MTO 3701 North Fairfax Drive Arlington VA 22203 United States Army Research Laboratory 2800 Powder Mill Road Adelphi MD 20783 United States

ISBN: (纸本)9780819475664

Next Generation EO/IR sensors using Nanostructures are being developed for a variety of Defense applications. In addition, large area IRFPA's are being developed on low cost substrates. In this paper, we will discuss the capabilities of a EO/IR sensor Model to provide a robust means for comparing performance of infrared FPA's and sensors that can operate in the visible and infrared spectral bands that coincide with the atmospheric windows - UV, Visible-NIR (0.4-1.8), SWIR (2.0-2.5), MWIR (3-5), and LWIR (8-14). The model will be able to predict sensor performance and also functions as an assessment tool for single-color and for multi-color imaging. The detector model can also characterize ZnO, Si, SiGe, InGaAs, InSb, HgCdTe and Nanostructure based sensors. The model can predict performance by also placing the specific FPA into an optical system, evaluates system performance (NEI, NETD, MRTD, and SNR). This model has been used as a tool for predicting performance of state-of-the-art detec or arrays and nanostructure arrays under development. Results of the analysis can be presented for various targets for each of the focal plane technologies for a variety of missions. © 2009 SPIE.

关键词： ii-VI semiconductors

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Array of X and gamma ray scintillator detector for space gamma ray telescope application

Array of X and gamma ray scintillator detector for space gam...

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IEEE Nuclear Science Symposium/Medical Imaging Conference

作者： Labanti, Claudio Marisaldi, Martino Fuschino, Fabio Bastia, Paolo Negri, Barbara Perotti, Francesco Soltau, Heike INAF IASF Dept Bologna Italy Thales Alenia Space Milano Milan Italy Agenzia Spaziale Italiana Rome Italy INAF IASF Dept Milan Italy PN Sensor Munche Germany Germany

ISBN: (纸本)9781424427147

A The instruments on board the latest gamma observatories (INTEGRAL, AGILE, GLAST) combines technologies based either on solid state or on scintillator detector, the first one being favorite when a low energy threshold and a good energy resolution is required, the latter being more convenient for large volume when worse performance are still acceptable. With the development of new scintillator materials and even more with new low-noise ligth readout devices the differences between the two techniques are narrowing and for some application the cheaper scintillator detector can compete with solid state devices. Furthermore both these detector concepts can be combined in a single compact device by means of the Pulse Shape Discrimination (PSD) technique that allows to discriminate direct interactions in silicon from scintillation events. Combined in arrays they can be the base for position senstive planes to be combined with coded mask in imaging instruments or the component of new generation Compton based telescopes. For this purpose two prototype systems have been designed and realized, both based on a 20 channels Silicon Drift Detectors (SDD) monolithic array coupled to individual 1 cm thick CsI(TI) scintillator crystals. In the first system the detector readout is implemented with ASICs tailored specifically to the SDD readout, while in the second system the PSD readout of the array is implemented. The performance of these kind of detectors tested in the various prototypes as well as their applications in new generation space telescopes are discussed.

关键词： Cesium iodide

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A biomedical multiprocessor SoC for closed-loop neuroprosthetic applications

A biomedical multiprocessor SoC for closed-loop neuroprosthe...

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IEEE International Conference on solid-state Circuits (ISSCC)

作者： Tung-Chien Chen Kuanfu Chen Zhi Yang Kimberly Cockerham Wentai Liu National Taiwan University Taipei Taiwan University of California Santa Cruz CA Stanford University Stanford CA

Successful proof-of-concept laboratory experiments on cortically controlled motor prostheses, brain pacemakers and hippocampal prostheses motivate continued development for neural prosthetic systems. Advances in implantable electrode arrays and miniaturized multichannel recording ICs enable long-duration, wireless and closed-loop experiments on freely moving subjects. To further improve clinically viable neural prostheses, the bulk associated with external systems must be eliminated. Thus a miniaturized processing-and-controlling system interfacing recording ICs and actuators in real time is required.

关键词： Neural prosthesis Sorting Principal component analysis Epilepsy Prosthetics sensor arrays Covariance matrix Logic gates Feature extraction Implants

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Advances in radar systems by SELEX Sistemi Integrati: Today and towards the future

Advances in radar systems by SELEX Sistemi Integrati: Today ...

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European Radar Conference (EURAD)

作者： Marina Grossi Annamaria Fiorello Stefano Pagliai Microelectron. & Photonic Dept. SELEX-Sist. Integrati Rome Italy Microelectronic and Photonic Department SELEX Sistemi Integrati Rome Italy Military Primary Radar Department SELEX Sistemi Integrati Rome Italy

SELEX Sistemi Integrati is now watching toward the future to reinforce its leadership in the state of the art of radar systems. The strong position in the market has been achieved by delivering top radar performance in many fields of application and it has been based on the capability to manage the proper technology insertion in its radar systems. For each radar product the Company has identified its own key technology components and has planned its development and insertion to take the right advantage from a well established radar knowledge. The same winning approach is now followed for the next generation of SELEX-SI radar systems. In the paper it will be shown how the Company has developed technology and radar systems together in the past, how it is delivering up to date solutions now and how it is preparing the new generation of radar systems by investing again in technology. In this field the focus will be on the new multifunction/multirole radar applications and on the technological capabilities that SELEX-SI is developing by taking advantage of its Research and development facilities.

关键词： Radar applications Radar antennas sensor arrays Paper technology Phased arrays Time to market Transmission line measurements Gallium arsenide solid state circuits Field programmable gate arrays

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Time-of-flight PET detector based on multi-pixel photon counter

Time-of-flight PET detector based on multi-pixel photon coun...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Chang Lyong Kim David L. McDaniel Alexander Ganin GE Global Research Center Niskayuna NY USA GE Healthcare Systems Waukesha WI USA

Geiger-mode multi-pixel APD is recognized as the best alternative solid-state photo-sensor for vacuum PMTs in various applications. Its magnetic field immunity and high gain have made it popular in MR/PET and high-energy physics detector research. In this paper, we utilized its compactness and high gain in the design of a TOF PET detector. In typical block detectors based on PMT, the full timing capability of both the PMT and scintillator could not be achieved due to the light sharing used in the Anger logic scheme. Since the Geiger-mode APD is a solid-state based technology, we can utilize one-to-one coupling between a scintillator and the photo-sensor to utilize the best timing capability of both. Also, the high photon detection efficiency of MPPC, Geiger mode APD from Hamamatsu, would help improve timing resolution. We made a block detector based on a 4 × 4 array of 3 × 3 mm 2 MPPC coupled to a 4 × 4 array of 3 × 3 × 25 mm 3 LYSO crystals to evaluate its performance. We have achieved an average energy resolution of 9% and 314ps coincidence timing resolution with very good uniformity. This shows that the solid-state based photo-sensor can be used for TOF PET detector. During the development of the detector, we recognized that a compact and low power electronic readout scheme is one of the biggest challenges, including its cost, for MPPC or other Geiger-mode APDs to be realized as products.

关键词： Positron emission tomography Counting circuits Timing solid state circuits sensor arrays Energy resolution Radiation detectors Magnetic fields Physics Logic

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developments in localisation sensor systems

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sensor REVIEW 2008年第2期28卷 98-101页

作者： Connolly, Christine Stalactite Technologies Ltd Wakefield UK

Purpose - The purpose of this paper is to report the development trends and emerging applications of non-GPS localisation sensors. Design/methodology/approach - The principles of gyroscopes and micro-electro-mechanical systems-based inertial sensors are introduced, followed by a review of products from various companies, and their applications. Findings - Highly integrated systems in robust solid-state materials are being packed into smaller housings, opening up new applications for inertial navigation sensors. The Kalman filter algorithm is widely used to remove noise from multi-sensor data and provide reliable attitude and heading measurements. applications range from stabilising cameras and detecting the motion of towed sonar arrays, to autonomous robot navigation, motion analysis in sports science, and navigating first-response rescue workers in disaster zones. Originality/value - Concentrates on non-GPS localisation technology, and shows that new developments are revolutionising position-finding and position-controlling applications.

关键词： intelligent sensors localization measurement

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