scholarly journals Subwavelength hole arrays with nanoapertures fabricated by scanning probe nanolithography

2006 ◽  
Vol 38 (2) ◽  
pp. 117-123 ◽  
Author(s):  
Z. Jaksic ◽  
M. Maksimovic ◽  
D. Vasiljevic-Radovic ◽  
M. Sarajlic
Keyword(s):  
Building Blocks ◽  
Scanning Probe ◽  
Positive Photoresist ◽  
Force Microscopy ◽  
Atomic Force ◽  
Optical Effects ◽  
Different Shapes ◽  
Subwavelength Hole Arrays ◽  
Hole Arrays ◽  
Electromagnetic Transmission

Owing to their surface plasmon-based operation, arrays of subwavelength holes show extraordinary electromagnetic transmission and intense field localizations of several orders of magnitude. Thus they were proposed as the basic building blocks for a number of applications utilizing the enhancement of nonlinear optical effects. We designed and simulated nanometer-sized subwavelength holes using an analytical approach. In our experiments we used the scanning probe method for nanolithographic fabrication of subwavelength hole arrays in silver layers sputtered on a positive photoresist substrate. We fabricated ordered nanohole patterns with different shapes, dispositions and proportions. The smallest width was about 60 nm. We characterized the fabricated samples by atomic force microscopy.

Scanning tunneling microscopy and atomic force microscopy: New tools for biology

1989 ◽  
Vol 47 ◽  
pp. 778-779
Author(s):  
CE Bracker ◽  
P. K. Hansma
Keyword(s):  
Physical Property ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Small Scale ◽  
Tunneling Microscopy ◽  
Force Microscopy ◽  
New Family ◽  
Small Probe ◽  
Atomic Force ◽  
Transmission Electron

A new family of scanning probe microscopes has emerged that is opening new horizons for investigating the fine structure of matter. The earliest and best known of these instruments is the scanning tunneling microscope (STM). First published in 1982, the STM earned the 1986 Nobel Prize in Physics for two of its inventors, G. Binnig and H. Rohrer. They shared the prize with E. Ruska for his work that had led to the development of the transmission electron microscope half a century earlier. It seems appropriate that the award embodied this particular blend of the old and the new because it demonstrated to the world a long overdue respect for the enormous contributions electron microscopy has made to the understanding of matter, and at the same time it signalled the dawn of a new age in microscopy. What we are seeing is a revolution in microscopy and a redefinition of the concept of a microscope.Several kinds of scanning probe microscopes now exist, and the number is increasing. What they share in common is a small probe that is scanned over the surface of a specimen and measures a physical property on a very small scale, at or near the surface. Scanning probes can measure temperature, magnetic fields, tunneling currents, voltage, force, and ion currents, among others.

SCANNING PROBE MICROSCOPY BASED NANOSCALE PATTERNING AND FABRICATION

COSMOS ◽  
2007 ◽  
Vol 03 (01) ◽  
pp. 1-21 ◽  
Author(s):  
XIAN NING XIE ◽  
HONG JING CHUNG ◽  
ANDREW THYE SHEN WEE
Keyword(s):  
Integrated Circuits ◽  
Scanning Probe Microscopy ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Force Microscopy ◽  
Nanoscale Patterning ◽  
Atomic Force ◽  
Probe Microscope ◽  
Molecular Manipulation

Nanotechnology is vital to the fabrication of integrated circuits, memory devices, display units, biochips and biosensors. Scanning probe microscope (SPM) has emerged to be a unique tool for materials structuring and patterning with atomic and molecular resolution. SPM includes scanning tunneling microscopy (STM) and atomic force microscopy (AFM). In this chapter, we selectively discuss the atomic and molecular manipulation capabilities of STM nanolithography. As for AFM nanolithography, we focus on those nanopatterning techniques involving water and/or air when operated in ambient. The typical methods, mechanisms and applications of selected SPM nanolithographic techniques in nanoscale structuring and fabrication are reviewed.

Measurement of Plasticity Gradients with Scanning Probe Microscopy

1993 ◽  
Vol 318 ◽  
Author(s):  
James D. Kiely ◽  
Dawn A. Bonnell
Keyword(s):  
Fracture Surface ◽  
Scanning Probe Microscopy ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Ceramic System ◽  
Force Microscopy ◽  
Metal Fracture ◽  
Atomic Force ◽  
Metal Ceramic

ABSTRACTScanning Tunneling and Atomic Force Microscopy were used to characterize the topography of fractured Au /sapphire interfaces. Variance analysis which quantifies surface morphology was developed and applied to the characterization of the metal fracture surface of the metal/ceramic system. Fracture surface features related to plasticity were quantified and correlated to the fracture energy and energy release rate.

Structural and Magnetic Investigation of Cu, Co Substituted NiFe2O4 Thin Films by Scanning Probe Microscopy (AFM, MFM)

2015 ◽  
Vol 830-831 ◽  
pp. 589-591 ◽  
Author(s):  
Hakikat Sharma ◽  
N.S. Negi
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Microstructural Analysis ◽  
Secondary Phase ◽  
Scanning Probe ◽  
Force Microscopy ◽  
Atomic Force ◽  
Magnetic Investigation ◽  
Probe Microscope ◽  
Xrd Patterns

In the present study we prepared NiFe2O4, Ni0.95Cu0.05Fe2O4and Ni0.94Cu0.05Co0.01Fe2O4thin films by metallo-organic decomposition method (MOD) using spin coating technique. The samples were characterized by XRD. XRD patterns of thin films confirmed the formation of cubic spinel structure without any secondary phase. For microstructural analysis we characterized samples by Scanning Probe Microscope (SPM). From Atomic force microscopy (AFM), we analyzed surface morphology, calculated grain size, roughness and porosity. It has been found that grain size and roughness affected by Cu, Co substitution. After this we carried out magnetic force microscopy (MFM) on the samples. Effect of substitution on magnetic grains was observed from MFM.

Bacteria and viruses in the objective of probe microscopy

2021 ◽  
Vol 3 ◽  
Author(s):  
I.V. Yaminsky ◽  
Keyword(s):  
Atomic Force Microscopy ◽  
Scanning Probe Microscope ◽  
Scanning Probe ◽  
Probe Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Probe Microscope

The article is devoted to the study of viruses and bacteria using a scanning probe microscope in the atomic force microscopy mode, in particular, to the question, what data can be obtained using this method and how to interpret it.

scholarly journals Layer by Layer Antimicrobial Coatings Based on Nafion, Lysozyme, and Chitosan

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1563 ◽  
Author(s):  
Ella N. Gibbons ◽  
Charis Winder ◽  
Elliot Barron ◽  
Diogo Fernandes ◽  
Marta J. Krysmann ◽  
...  
Keyword(s):  
Surface Characteristics ◽  
Building Blocks ◽  
Layer By Layer ◽  
Exclusion Zone ◽  
Antimicrobial Coatings ◽  
Force Microscopy ◽  
New Family ◽  
Atomic Force ◽  
Multilayer Assemblies ◽  
And Staphylococcus Aureus

The study focuses on the development of a new family of layer-by-layer coatings comprising Nafion, lysozyme and chitosan to address challenges related to microbial contamination. Circular dichroism was employed to gain insights on the interactions of the building blocks at the molecular level. Quartz crystal microbalance tests were used to monitor in real time the build-up of multilayer coatings, while atomic force microscopy, contact angle and surface zeta potential measurements were performed to assess the surface characteristics of the multilayer assemblies. Remarkably, the nanocoated surfaces show almost 100% reduction in the population of both Escherichia coli and Staphylococcus aureus. The study suggests that Nafion based synergistic platforms can offer an effective line of defence against bacteria, facilitating antimicrobial mechanisms that go beyond the concept of exclusion zone.

scholarly journals Structural and Chemical Hierarchy in Hydroxyapatite Coatings

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4447
Author(s):  
Karlis A. Gross ◽  
Christiane Petzold ◽  
Liene Pluduma-LaFarge ◽  
Maris Kumermanis ◽  
Håvard J. Haugen
Keyword(s):  
Electrical Potential ◽  
Building Blocks ◽  
X Ray Diffraction ◽  
Kelvin Probe ◽  
Structural Variations ◽  
Homogeneous Microstructure ◽  
Structural Hierarchy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Hydroxyapatite Coatings

Hydroxyapatite coatings need similarly shaped splats as building blocks and then a homogeneous microstructure to unravel the structural and chemical hierarchy for more refined improvements to implant surfaces. Coatings were thermally sprayed with differently sized powders (20–40, 40–63 and 63–80 µm) to produce flattened homogeneous splats. The surface was characterized for splat shape by profilometry and Atomic force microscopy (AFM), crystal size by AFM, crystal orientation by X-ray diffraction (XRD) and structural variations by XRD. Chemical composition was assessed by phase analysis, but variations in chemistry were detected by XRD and Raman spectroscopy. The resulting surface electrical potential was measured by Kelvin probe AFM. Five levels of structural hierarchy were suggested: the coating, the splat, oriented crystals, alternate layers of oxyapatite and hydroxyapatite (HAp) and the suggested anion orientation. Chemical hierarchy was present over a lower range of order for smaller splats. Coatings made from smaller splats exhibited a greater electrical potential, inferred to arise from oxyapatite, and supplemented by ordered OH− ions in a rehydroxylated surface layer. A model has been proposed to show the influence of structural hierarchy on the electrical surface potential. Structural hierarchy is proposed as a means to further refine the properties of implant surfaces.

Spectroscopic Characterization of Flame-Generated 2-D Carbon Nano-Disks

2015 ◽  
Vol 1726 ◽  
Author(s):  
Patrizia Minutolo ◽  
Mario Commodo ◽  
Gianluigi De Falco ◽  
Rosanna Larciprete ◽  
Andrea D'Anna
Keyword(s):  
Carbon Nanostructures ◽  
Functional Materials ◽  
Building Blocks ◽  
Spectroscopic Characterization ◽  
Molecular Compound ◽  
Force Microscopy ◽  
Atomic Force ◽  
Thin Carbon ◽  
On Line ◽  
20 Nm

ABSTRACTIn this work we produce atomically thin carbon nanostructures which have a disk-like shape when deposited on a substrate. These nanostructures have intermediate characteristics between a graphene island and a molecular compound and have the potentiality to be used either as they are, or to become building blocks for functional materials or to be manipulated and engineered into composite layered structures.The carbon nanostructures are produced in a premixed ethylene/air flame with a slight excess of fuel with respect to the stoichiometric value. The size distribution of the produced compounds in aerosol phase has been measured on line by means of a differential mobility analyzer (DMA) and topographic images of the structures deposited on mica disks were obtained by Atomic Force Microscopy. Raman spectroscopy and XPS have been used to characterize their structure and the electronic and optical properties were obtained combining on-line photoionization measurements with Cyclic Voltammetry, light absorption and photoluminescence.When deposited on the mica substrate the carbon compounds assume the shape of an atomically thin disk with in plane diameter of about 20 nm. Carbon nano-disks consist of a network of small aromatic island with in plane length, La, of about 1 nm. Raman spectra evidence a significant amount of disorder which is in a large part due to the quantum confinement in the aromatic islands. Nano-disks contain small percentage of sp3 and the O/C ratio is lower than 6%. They furthermore present interesting UV and visible photoluminescence properties.

Block Copolymer Microdomain Morphologies by Phase Detection Imaging

1996 ◽  
Vol 461 ◽  
Author(s):  
Ph. Leclère ◽  
J. M. Yu ◽  
R. Lazzaroni ◽  
Ph. Dubois ◽  
R. JéRôme ◽  
...  
Keyword(s):  
Scanning Probe Microscopy ◽  
Scanning Probe ◽  
Phase Detection ◽  
Surface Phase ◽  
Force Microscopy ◽  
Microscopy Technique ◽  
Atomic Force ◽  
Different Types ◽  
Microdomain Structure ◽  
Thermodynamic Processes

ABSTRACTAtomic Force Microscopy with Phase Detection Imaging is used to study the surface microdomain morphology of thick (i.e., ca. 2 mm) films of triblock copolymers, such as polymethylmethacrylate - block - polybutadiene - block - polymethylmethacrylate copolymers prepared by a well-taylored two-step sequential copolymerization promoted by a 1,3-diisopropenylbenzene based difunctional anionie initiator. By means of this new scanning probe microscopy technique, it is shown that the surface exhibits a segregated microphase structure, corresponding to the different types of components predicted theoretically by thermodynamic processes. We investigate the relationships between the size and characteristics of the microdomain structure as a function of the molecular parameters of the constituent polymers. Our data illustrate the interest of Phase Detection Imaging in the elucidation of surface phase separation in block copolymers.

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