LIII. The Examination of p-n Junctions with the Scanning Electron Microscope†

Oatley, C.W.; Evekhart, T. E.

doi:10.1080/00207215708937060

Cited by 58 publications

(26 citation statements)

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“…Although the percolation threshold is known to be affected by various factors, e.g. aspect ratio of CNTs [35,36], CNT waviness [37][38][39], processing conditions [40][41][42], the obtained results clearly demonstrate the potential of the aqueous film former systems for the deposition of CNT networks on GF.…”

Section: Modification Of the Polymeric Film Former System By Dispersementioning

confidence: 72%

“…After the annealing CNTs can hardly be observed sticking out the PP film on the GF. However, charge contrast imaging [42][43][44][45] enables one to derive information about the distribution of CNTs within the outermost layer of nanocomposites. Figure 3d Whenever a single GF fails or the interfacial shear stress exceeds a critical limit and locally causes the interphase to fail this will be reflected in a permanent increase of resistance, as certain conductive paths cease to exist.…”

Section: Preparation and Characterization Of Cnt-coated Gf Yarnsmentioning

confidence: 99%

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Health monitoring in continuous glass fibre reinforced thermoplastics: Manufacturing and application of interphase sensors based on carbon nanotubes

Rausch

Mäder

2010

Composites Science and Technology

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To cite this version:J. Rausch, E. Mäder. Health monitoring in continuous glass fibre reinforced thermoplastics: Manufacturing and application of interphase sensors based on carbon nanotubes. Composites Science and Technology, Elsevier, 2010, 70 (11), pp.1589. 10.1016/j.compscitech.2010 Accepted Manuscript This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT AbstractIn this study, a new approach for health monitoring of GF reinforced composites is presented by incorporating percolated carbon nanotubes (CNTs) into the composites interphase. This is achieved applying CNT-filled coatings to glass fibres (GF). Taking advantage of the electrical properties of CNTs, this allows a highly localized monitoring of the composites interphase.The approach is largely independent on matrix material and can be applied to thermoplastic or thermoset resin matrix materials with minor adjustments. The resistance of CNT-coated GF yarns shows a linear dependence on the yarn length and depends on the CNT weight fraction of the coating, as well as on the amount of coating on the GF yarn. Performing tensile tests in combination with simultaneous resistance measurements on CNT-coated GF yarns embedded in a polypropylene matrix, the interphase behaviour during mechanical loading is monitored, providing information on this specific area. This allows relating interphase failure or GF breakage to the resistance data and demonstrates the potential of this approach for health monitoring of GF reinforced composites.

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Section: Modification Of the Polymeric Film Former System By Dispersementioning

confidence: 72%

Section: Preparation and Characterization Of Cnt-coated Gf Yarnsmentioning

confidence: 99%

Health monitoring in continuous glass fibre reinforced thermoplastics: Manufacturing and application of interphase sensors based on carbon nanotubes

Rausch

Mäder

2010

Composites Science and Technology

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“…The technique is based on sensing potential variations on the sample surface that were caused by electron charging. This contrast effect was known as early as 1957 [59] and was termed "voltage contrast". A discussion on this technique was conducted by Chung et al [60] in 1983 who monitored carbon black fillers.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the quality of carbon nanotube dispersions in polymers using scanning electron microscopy

Kovacs

Andresen

Pauls

et al. 2007

Carbon

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The ability to examine conducting filler particles in an insulating polymer matrix by scanning electron microscopy (SEM) was investigated. The detection of selected secondary electrons is necessary to resolve sub-micron scale filler particles, but not every SEM detector seems to be able to monitor the small changes introduced by the conducting filler particles. The influence of SEM parameters and the challenge of image interpretation in view of the apparent lack of appropriate information in literature are discussed. In accordance with other experiments on light element samples, all monitored electrons seem to be emitted within approximately 50 nm of the sample depth and no information is accessible from deeper regions even by increasing the acceleration voltage.

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“…The combined effect of secondary and field-emission is also possible through electron-stimulated field-emission [32,33], where electrons strike the tip of a nanoscale emitter under a strong applied field, leading to highly enhanced emission of further electrons. An applied electric field can also affect the emission and trajectories of secondary electrons emitted from a cathode, enabling voltage-contrast imaging in electron microscopy [34][35][36]. Finally, it is only natural to expect that more than two stimuli can also be employed, as in combining several of field, light, heat, and primary energetic particles all at once, to induce electron emission.…”

Section: Sourcementioning

confidence: 99%

Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

Nojeh

2014

ISRN Nanomaterials

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Carbon nanotubes have a host of properties that make them excellent candidates for electron emitters. A significant amount of research has been conducted on nanotube-based field-emitters over the past two decades, and they have been investigated for devices ranging from flat-panel displays to vacuum tubes and electron microscopes. Other electron emission mechanisms from carbon nanotubes, such as photoemission, secondary emission, and thermionic emission, have also been studied, although to a lesser degree than field-emission. This paper presents an overview of the topic, with emphasis on these less-explored mechanisms, although field-emission is also discussed. We will see that not only is electron emission from nanotubes promising for electronsource applications, but also its study could reveal unusual phenomena and open the door to new devices that are not directly related to electron beams.

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LIII. The Examination of p-n Junctions with the Scanning Electron Microscope†

Cited by 58 publications

References 1 publication

Health monitoring in continuous glass fibre reinforced thermoplastics: Manufacturing and application of interphase sensors based on carbon nanotubes

Health monitoring in continuous glass fibre reinforced thermoplastics: Manufacturing and application of interphase sensors based on carbon nanotubes

Analyzing the quality of carbon nanotube dispersions in polymers using scanning electron microscopy

Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

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