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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Structural evolution of polycrystalline tungsten tips with palladium oxide reservoirs
摘要： We present herein a method to prepare thermodynamically stable tungsten (W) nanopyramids. First, the sides of a W needle are coated with a collodion containing powdered palladium oxide. The W needle is subsequently annealed under ultrahigh vacuum to adsorb palladium (Pd) atoms onto the apex of the W needle via surface diffusion and thereby produce a W nanotip coated with a monolayer Pd film. Field ion microscopy reveals that {111} planes of the W nanotip are contracted by faceting the {211} planes surrounding the {111} plane. This structural change is analogous to the formation of three-sided W nanopyramids. The W nanopyramids appear generally the same as the existing nanopyramids. However, as opposed to the existing nanopyramids, the tip of the proposed nanopyramids does not comprise a single atom.
关键词： faceting,nanotip,palladium oxide,field emission,palladium,tungsten,field ion microscopy
更新于2025-09-23 15:21:21
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Properties of one-free standing CNT cold cathode for high resolution devices
摘要： A high resolution imaging technology has been developed with cold cathode electron source. Just grown carbon nanotube (CNT) field emitter was prepared for electron microscope. The angular current density, virtual source and lifetime of the emitted electrons were evaluated with three different categorized. An estimated beam brightness was extracted from the experimental value. With the geometric field enhancement factor, reduced brightness (Br) is depend on and enhanced brightness with higher geometric factors. The reduced brightness of 1.42 × 1011 A · m-2sr-1V-1 at 1,100V of applied voltage obtained.
关键词： CNT cold cathode,High brightness,Electron microscopy
更新于2025-09-23 15:21:21
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Spin resolved Imaging with Scanning Field-Emission Microscopy
摘要： Secondary electrons emitted from a scanning field-emission microscope are spin analyzed with a Mott detector. Spin polarization up to 15% is observed with a lateral resolution of less than 5 nm, with a potential resolution of even less than 1 nm. In this paper the proof of principle is conducted by comparing this method with a well-established method of spin mapping and with reference samples examined by these two microscopes.
关键词： Secondary Electrons,Magnetic Imaging,Electron Microscopy,Field Emission
更新于2025-09-23 15:21:21
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Atomic Force Microscopy in Molecular and Cell Biology || Assessment of Pathological or Drug-Dependent Changes in Cell Membrane Morphology and Cell Biomechanical Properties by Atomic Force Microscopy
摘要： Identification of the nanoscale changes that take place in cell membrane (CM) morphology or cell biomechanical properties (CBPs) in disease states or in response to drug treatment enable for a better understanding of the effects of the drugs on disease pathogenesis and recovery. CM proteins and CBPs have a crucial role in the regulation of many physiological and pathological processes. Direct assessment of the CM and CBPs is therefore useful not only for a better appreciation of cell structure but also for a better understanding of cell pathophysiology. Atomic force microscopy (AFM) is a technique that can be employed to assess CM structure and CBPs at the nanometer scale. In the first part of this chapter, we describe the principles of AFM and appraise its value in the assessment of CM morphology and CBPs. In the second part, we review examples of disease- or drug- dependent changes in CM morphology and CBPs that have been elucidated using AFM.
关键词： Nanoscale,Atomic force microscopy,Cell membrane
更新于2025-09-23 15:21:21
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Silicon Cold Field Emission Electron Sources for Electron Microscopy Inspection Systems
摘要： Next generation electron beam inspection tools will require a high brightness electron source. We have designed, microfabricated and tested arrays of metal coated silicon cold field emitters that have high current density and high reduced brightness, offering a promising alternative to thermal field emitters. One of the main challenges that must be addressed with cold field emitters is achieving stable emission current. Using current pulsing, we have been able to improve the stability of field emission currents and have demonstrated beam currents with less than 1% noise.
关键词： electron source,microfabrication,cold field emission,electron microscopy,inspection systems,cathode,silicon
更新于2025-09-23 15:21:21
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Fluorescence Imaging for Ultrafiltration of Individual Nanoparticles from a Colloidal Solution in Track Membranes
摘要： We have used ? uorescence nanoscopy for direct imaging of adsorption of individual colloidal quantum dots of diameter ~10 nm (spherical core/shell CdSeS/ZnS semiconductor nanocrystals, functionalized by organic oleic acid ligands) in nanopores of a nuclear ? lter (a polypropylene track membrane with pores of diameter ~500 nm). We have shown that when a colloidal toluene solution passes through the pores of the membrane, the nanoparticles are completely retained at a depth of 10 μm.
关键词： nanopore,single-photon source,CdSe,membrane,nanoscopy,entangled-photon source,quantum dot,colloidal solution,microscopy,nanoparticles,ultra? ltration,oleic acid,nuclear ? lter,luminescence,polymer
更新于2025-09-23 15:21:21
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Cutaneous erysipeloid metastasis of cholangiocarcinoma and evaluation by in?vivo reflectance confocal microscopy
摘要： Cutaneous metastases are relatively uncommon, occurring in only 0.7% to 9% of all internal malignancies. Cholangiocarcinoma is a rare bile duct neoplasm that accounts for less than 2% of malignancies. Although it is well known that cholangiocarcinoma metastasizes to the lungs, liver, peritoneum, and retroperitoneal lymph nodes, a retrospective review of the literature from 1978 to 2014 indicates only 30 cases of cutaneous cholangiocarcinoma, with 17 cases presenting without concurrent metastasis in other sites. Among these patients, the cutaneous metastatic disease occurred evenly at adjacent and distant sites, presenting as 0.3-cm to 4-cm erythematous papules or nodules with or without ulceration. The median overall survival after diagnosis of cutaneous cholangiocarcinoma metastasis is 4 months. Paradoxically, single-site metastases carry a significantly worse prognosis than multiple-site metastases and may be attributed to difficulty in identifying a singular lesion. In vivo reflectance confocal microscopy (RCM) is a novel, noninvasive diagnostic alternative to skin biopsy with comparable insurance reimbursement that captures real-time, high-resolution, cellular-level images from the skin surface down to the reticular dermis (up to 300 μm depth). This modality forgoes traumatic biopsy and has been used for diagnosis and monitoring of skin cancers and inflammatory dermatoses.
关键词： cholangiocarcinoma,erysipeloid,cutaneous metastasis,reflectance confocal microscopy
更新于2025-09-23 15:21:21
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Silicon nitride photonic integration for visible light applications
摘要： In this article, we provide a review of fabrication platforms and state of the art developments in the area of silicon nitride photonic integrated circuits (PICs) for the visible wavelength range, mostly employed in biomedical and chemical sensing applications. Additionally, we introduce PIX4life, the European pilot line for silicon nitride PICs for visible applications. PIX4life provides a unified framework for the development of such PICs, including design and software, fabrication, characterization and packaging.
关键词： Visible light,Silicon nitride,Photonics,Biophotonics,Microscopy,Sensing
更新于2025-09-23 15:21:21
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Frictional Characteristics of Suspended MoS <sub/>2</sub>
摘要： Molybdenum disulfide (MoS2), a booming layered two-dimensional (2D) nanomaterial, has gain intensive interests for its remarkable physical properties. In this work, the friction characteristics of suspended MoS2 are systematically investigated with atomic force microscopy (AFM). The friction on the suspended MoS2 is much larger than that on the supported MoS2 because of the softening bending rigidity and easier formation of puckering at the AFM tip-MoS2 contact interface, and the difference would increases with the applied load. Similar to the supported MoS2, the friction on the suspended MoS2 also decreases with the increasing layers because of the enhanced bending rigidity. The friction on the suspended MoS2 is relatively insensitive to the shapes of holes below but sensitive to the dimensions. This work can provide beneficial guidance for the diverse design requirements of MoS2-based nanoelectromechanical devices.
关键词： friction,suspended,Molybdenum disulfide,puckering effect,bending rigidity,AFM,atomic force microscopy,MoS2,supported
更新于2025-09-23 15:21:21
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Fabrication of Two-Dimensional Arrays of Fluorescent Centers in Single-Crystalline Diamond Using Particle Beam Writing
摘要： Micrometer-scale patterning was performed using the particle beam writing technique with a focused heavy-ion microbeam, allowing the creation of a unique two-dimensional distribution of fluorescent centers in single-crystalline diamond. The focused nitrogen microbeam was scanned over the target of single-crystalline diamond prepared by chemical vapor deposition to create nitrogen-vacancy (NV) centers at defined positions. Imaging using a custom-built confocal fluorescence microscopy system revealed that the desired NV distribution was generated in the target crystal with a spatial resolution similar to the beam resolution. A two-dimensional matrix barcode test pattern was successfully generated in a diamond substrate to demonstrate the encryption of information inside a solid-state target.
关键词： diamond,particle beam writing,two-dimensional,chemical vapor deposition,nitrogen vacancy centers,confocal fluorescence microscopy
更新于2025-09-23 15:21:21