SPIE Micro + Nano Materials, Devices, and Applications最新文献_第2页

Fabrication and optical characterisation of InGaN/GaN nanorods InGaN/GaN纳米棒的制备及光学特性

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202420

X. Dai, X. Wen, M. Latzel, M. Heilmann, C. Appelt, Yu Feng, Jianfeng Yang, Weijian Chen, Shujuan Huang, S. Shrestha, S. Christiansen, G. Conibeer

引用次数: 0

Nano-engineered flexible pH sensor for point-of-care urease detection 用于即时脲酶检测的纳米工程柔性pH传感器

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2203158

A. Sardarinejad, D. Maurya, C. Y. Tay, B. Marshall, K. Alameh

{"title":"Nano-engineered flexible pH sensor for point-of-care urease detection","authors":"A. Sardarinejad, D. Maurya, C. Y. Tay, B. Marshall, K. Alameh","doi":"10.1117/12.2203158","DOIUrl":"https://doi.org/10.1117/12.2203158","url":null,"abstract":"Accurate pH monitoring is crucial for many applications, such as, water quality monitoring, blood monitoring, chemical and biological analyses, environmental monitoring and clinical diagnostic. The most common technique for pH measurement is based on the use of conventional glass pH electrodes. Glass electrodes have several limitations, such as mechanical fragility, large size, limited shapes and high cost, making them impractical for implementation as Lab-onchips and pH sensor capsules. Various metal oxides, such as RuO2, IrO2, TiO2, SnO2, Ta2O5 and PdO have recently been proposed for the realization of pH sensing electrodes. Specifically, ruthenium oxide exhibits unique properties including thermal stability, excellent corrosion resistance, low hysteresis high sensitivity, and low resistivity. In this paper, we demonstrate the concept of a miniaturized ion selective electrode (ISE) based pH sensor for point-of-care urease monitoring. The sensor comprises a thin film RuO2 on platinum sensing electrode, deposited using E-beam and R.F. magnetron sputtering, in conjunction with an integrated Ag/AgCl reference electrode. The performance and characterization of the developed pH/urea sensors in terms of sensitivity, resolution, reversibility and hysteresis are investigated. Experimental results show a linear potential-versus-urea-concentration response for urea concentrations in the range 0 - 180 mg/ml. Experimental results demonstrate super-Nernstian slopes in the range of 64.33 mV/pH - 73.83 mV/pH for RF sputtered RuO2 on platinum sensing electrode using a 80%:20% Ar:O2 gas ratio. The RuO2 sensor exhibits stable operation and fast dynamic response, making it attractive for in vivo use, wearable and flexible biomedical sensing applications.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131717425","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}

引用次数: 2

Multimode fibres: a pathway towards deep-tissue fluorescence microscopy 多模纤维:通往深层组织荧光显微镜的途径

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202355

M. Plöschner, T. Tyc, T. Čižmár

{"title":"Multimode fibres: a pathway towards deep-tissue fluorescence microscopy","authors":"M. Plöschner, T. Tyc, T. Čižmár","doi":"10.1117/12.2202355","DOIUrl":"https://doi.org/10.1117/12.2202355","url":null,"abstract":"Fluorescence microscopy has emerged as a pivotal platform for imaging in the life sciences. In recent years, the overwhelming success of its different modalities has been accompanied by various efforts to carry out imaging deeper inside living tissues. A key challenge of these efforts is to overcome scattering and absorption of light in such environments. Multiple strategies (e.g. multi-photon, wavefront correction techniques) extended the penetration depth to the current state-of-the-art of about 1000μm at the resolution of approximately 1μm. The only viable strategy for imaging deeper than this is by employing a fibre bundle based endoscope. However, such devices lack resolution and have a significant footprint (1mm in diameter), which prohibits their use in studies involving tissues deep in live animals. We have recently demonstrated a radically new approach that delivers the light in/out of place of interest through an extremely thin (tens of microns in diameter) cylindrical glass tube called a multimode optical fibre (MMF). Not only is this type of delivery much less invasive compared to fibre bundle technology, it also enables higher resolution and has the ability to image at any plane behind the fibre without any auxiliary optics. The two most important limitations of this exciting technology are (i) the lack of bending flexibility and (ii) high demands on computational power, making the performance of such systems slow. We will discuss how to overcome these limitations.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133291266","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}

引用次数: 0

Liquid marble as microbioreactor for bioengineering applications 液体大理石微生物反应器在生物工程中的应用

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2201110

F. Sarvi, Kanika Jain, Layla Alhasan, Tina Arbatan, W. Shen, P. Chan

引用次数: 0

Surface plasmon interference lithography using Al grating structure on glass 铝光栅结构玻璃表面等离子体干涉光刻技术

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202516

Y. Kim, K. Choi

引用次数: 0

Enabling rapid behavioral ecotoxicity studies using an integrated lab-on-a-chip systems 使用集成的芯片实验室系统实现快速行为生态毒性研究

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202394

Yushi Huang, D. Nugegoda, D. Wlodkowic

{"title":"Enabling rapid behavioral ecotoxicity studies using an integrated lab-on-a-chip systems","authors":"Yushi Huang, D. Nugegoda, D. Wlodkowic","doi":"10.1117/12.2202394","DOIUrl":"https://doi.org/10.1117/12.2202394","url":null,"abstract":"Behavioral ecotoxicity tests are gaining an increasing recognition in environmental toxicology. Behavior of sensitive bioindicator species can change rapidly in response to an acute exposure to contaminants and thus has a much higher sensitivity as compared to conventional LC50 mortality tests. Furthermore, behavioral endpoints seems to be very good candidates to develop early-warning biomonitoring systems needed for rapid chemical risk assessment. Behavioral tests are non-invasive, fast, do not harm indicator organisms (behavioural changes are very rapid) and are thus fully compatible with 3R (Replacement – Reduction – Refinement) principle encouraging alternatives to conventional animal testing. These characteristics are essential when designing improved ecotoxicity tests for chemical risk assessment. In this work, we present a pilot development of miniaturized Lab-on-a-Chip (LOC) devices for studying toxin avoidance behaviors of small aquatic crustaceans. As an investigative tool, LOCs represent a new direction that may miniaturize and revolutionize behavioral ecotoxicology. Specifically our innovative microfluidic prototype: (i) enables convening “caging” of specimens for real-time videomicroscopy; (ii) eliminates the evaporative water loss thus providing an opportunity for long-term behavioral studies; (iii) exploits laminar fluid flow under low Reynolds numbers to generate discrete domains and gradients enabling for the first time toxin avoidance studies on small aquatic crustaceans; (iv) integrates off-the-chip mechatronic interfaces and video analysis algorithms for single animal movement analysis. We provide evidence that by merging innovative bioelectronic and biomicrofluidic technologies we can deploy inexpensive and reliable systems for culture, electronic tracking and complex computational analysis of behavior of bioindicator organisms.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126190890","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}

引用次数: 5

Investigation of emission properties of vacuum diodes with nanodiamond-graphite emitters 纳米金刚石-石墨真空二极管发射特性研究

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202812

E. Gornev, S. Orlov, R. Yafarov, S. Timoshenkov, V. Timoshenkov, A. Timoshenkov

{"title":"Investigation of emission properties of vacuum diodes with nanodiamond-graphite emitters","authors":"E. Gornev, S. Orlov, R. Yafarov, S. Timoshenkov, V. Timoshenkov, A. Timoshenkov","doi":"10.1117/12.2202812","DOIUrl":"https://doi.org/10.1117/12.2202812","url":null,"abstract":"The aim of the work was to study the effect of various microelectronic structural and technological implementations to improve the field emission properties of the nano-carbon emitters. The field emission properties of vacuum diodes with nanodiamond-graphite emitters of different geometric shapes was researched. The nanodiamond-graphite layers deposition were carried out from ethanol vapor at low pressure using microwave plasma. Three series of experiments were studied. Researching of emission currents with flat cathodes on silicon wafer coated by nanodiamond-graphite layer were done in first series of experiments. In the second series of experiments, the electrical parameters of integrated field emission diodes with flat nanodiamond-graphite emitters was studied. In the third series of experiments, the electrical parameters of field emission with flat nanodiamond-graphite formed as a micro-sized needles or blades were studied. Vacuum emission studies were done at temperature 300K and pressure 1 × 10-6 Torr. Threshold voltage from10-50V per micron and current density about 0.2 A/cm2 were obtained in the first series of experiments. In the second and third series of experiments, a threshold voltage from 1 to 10V/ μm and current density of 1.75 A/cm2 were displayed. The greatest current density more than 20 A/cm2 was obtained using a blade-type emitter.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"218 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123863624","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}

引用次数: 0

Some minding about the creation of multi-spectrum passive terahertz imaging system 关于建立多光谱无源太赫兹成像系统的几点思考

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2196796

Alexander Denisov, J. Qiu, Shengchang Lan, Hao Liu, Yuriy Cherukhin

引用次数: 0

Evaluation of zinc oxide nano-microtetrapods for biomolecule sensing applications 氧化锌纳米微四足体在生物分子传感中的应用评价

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202529

Wei Zhao, Yichen Zhao, Mikael C. F. Karlsson, Qin Wang, M. Toprak

{"title":"Evaluation of zinc oxide nano-microtetrapods for biomolecule sensing applications","authors":"Wei Zhao, Yichen Zhao, Mikael C. F. Karlsson, Qin Wang, M. Toprak","doi":"10.1117/12.2202529","DOIUrl":"https://doi.org/10.1117/12.2202529","url":null,"abstract":"Zinc oxide tetrapods (ZnO-Ts) were synthesized by flame transport synthesis using Zn microparticles. This work herein reports a systematical study on the structural, optical and electrochemical properties of the ZnO-Ts. The morphology of the ZnO-Ts was confirmed by scanning electron microscopy (SEM) as joint structures of four nano-microstructured legs, of which the diameter of each leg is 0.7-2.2 μm in average from the tip to the stem. The ZnO-Ts were dispersed in glucose solution to study the luminescence as well as photocatalytic activity in a mimicked biological environment. The photoluminescence (PL) intensity in the ultraviolet (UV) region quenches with linear dependence to increased glucose concentration up to 4 mM. The ZnO-Ts were also attached with glucose oxidase (GOx) and over coated with a thin film of Nafion to form active layers for electrochemical glucose sensing. The attachment of GOx and coating of Nafion were confirmed by infrared spectroscopy (FT-IR). Furthermore, the current response of the active layers based on ZnO-Ts was investigated by cyclic voltammetry (CV) in various glucose concentrations. Stable current response of glucose was detected with linear dependence to glucose concentration up to 12 mM, which confirms the potential of ZnO-Ts for biomolecule sensing applications.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131453133","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}

引用次数: 1

Improved properties of phosphor-filled luminescent down-shifting layers: reduced scattering, optical model, and optimization for PV application 改进的磷填充发光下移层性能:减少散射、光学模型和优化PV应用

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202343

A. Solodovnyk, B. Lipovšek, K. Forberich, E. Stern, J. Krč, M. Batentschuk, M. Topič, C. Brabec

{"title":"Improved properties of phosphor-filled luminescent down-shifting layers: reduced scattering, optical model, and optimization for PV application","authors":"A. Solodovnyk, B. Lipovšek, K. Forberich, E. Stern, J. Krč, M. Batentschuk, M. Topič, C. Brabec","doi":"10.1117/12.2202343","DOIUrl":"https://doi.org/10.1117/12.2202343","url":null,"abstract":"We studied the optical properties of polymer layers filled with phosphor particles in two aspects. First, we used two different polymer binders with refractive indices n = 1.46 and n = 1.61 (λ = 600 nm) to decrease Δn with the phosphor particles (n = 1.81). Second, we prepared two particle size distributions D50 = 12 μm and D50 = 19 μm. The particles were dispersed in both polymer binders in several volume concentrations and coated onto glass with thicknesses of 150 - 600 μm. We present further a newly developed optical model for simulation and optimization of such luminescent down-shifting (LDS) layers. The model is developed within the ray tracing framework of the existing optical simulator CROWM (Combined Ray Optics / Wave Optics Model), which enables simulation of standalone LDS layers as well as complete solar cells (including thick and thin layers) enhanced by the LDS layers for an improved solar spectrum harvesting. Experimental results and numerical simulations show that the layers of the higher refractive index binder with larger particles result in the highest optical transmittance in the visible light spectrum. Finally we proved that scattering of the phosphor particles in the LDS layers may increase the overall light harvesting in the solar cell. We used numerical simulations to determine optimal layer composition for application in realistic thin-film photovoltaic devices. Surprisingly LDS layers with lower measured optical transmittance are more efficient when applied onto the solar cells due to graded refractive index and efficient light scattering. Therefore, our phosphor-filled LDS layers could possibly complement other light-coupling techniques in photovoltaics.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128127288","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}

引用次数: 1