scholarly journals Grids for Applications in High-Temperature High-Resolution Transmission Electron Microscopy

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Yucheng Lan ◽  
Hui Wang ◽  
Dezhi Wang ◽  
Gang Chen ◽  
Zhifeng Ren
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Temperature ◽  
High Resolution ◽  
Atomic Layer ◽  
Deposition Technique ◽  
Amorphous Films ◽  
Transmission Electron ◽  
Layer Deposition ◽  
Atomic Layer Deposition Technique

New TEM grids coated with ultrathin amorphous films have been developed using atomic layer deposition technique. The amorphous films can withstand temperatures over in air and in vacuum when the thickness of the film is 2 nm, and up to in air when the thickness is 25 nm, which makes heating TEM grids with nanoparticles up to in air and immediate TEM observation without interrupting the nanoparticles possible. Such coated TEM grids are very much desired for applications in high-temperature high-resolution transmission electron microscopy.

Growth of Nano-Needles of Manganese(IV) Oxide by Atomic Layer Deposition

2008 ◽  
Vol 8 (2) ◽  
pp. 1003-1011
Author(s):  
Ola Nilsen ◽  
Steinar Foss ◽  
Arne Kjekshus ◽  
Helmer Fjellvåg
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Deposition Technique ◽  
Transmission Electron ◽  
Layer Deposition ◽  
Atomic Layer Deposition Technique

Needles of manganese(IV) oxide in the nanometer range have been synthesised using the atomic layer deposition technique. Traditionally the atomic layer deposition technique is used for the fabrication of thin films, however, we find that needles of β-MnO2 are formed when manganese(IV) oxide is deposited as relatively thick (ca. 800 nm) thin films on substrates of α-Al2O3 [(001) and (012) oriented]. There is no formation of needles when the film is deposited on substrates such as Si(100) or soda lime glass. The film is formed using Mn(thd)3 (Hthd = 2,2,6,6-tetramethylheptane-3,5-dione) and ozone as precursors. While thin films (ca. 100 nm) consist of ε′-MnO2,22, 23 the same process applied to thicker films results in the formation of nano-needles of β-MnO2. These needles of β-MnO2 have dimensions ranging from approximately 1.5 μm at the base down to very sharp tips. The nano-needles and the bulk of the films have been analysed by atomic force microscopy, scanning electron microscopy, X-ray diffraction, and transmission electron microscopy.

Atomistic Visualization of Mechanical Interaction in Gold Crystalline Boundaries by Time-Resolved High Resolution Transmission Electron Microscopy

1998 ◽  
Vol 05 (03n04) ◽  
pp. 739-745
Author(s):  
Tokushi Kizuka
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Atomic Layer ◽  
Mechanical Tests ◽  
Atomic Scale ◽  
Mechanical Interaction ◽  
Time Resolved ◽  
Specimen Holder ◽  
Transmission Electron

The atomic processes in mechanical interaction were visualized by time-resolved high resolution transmission electron microscopy at a spatial resolution of 0.2 nm and a time resolution of 1/60 s. Nanometer-sized tips of gold were approached, contacted, bonded, deformed and fractured inside a 200 kV electron microscope using a piezo-driving specimen holder. The crystallographic boundary formed after the contact. A few layers near the surfaces and bonding boundaries were responsible for the approach, contact and bonding processes. Atomic scale mechanical tests, such as the friction test, compressing, tensile and shear deformation tests, were proposed. A new type of mechanical processing at one-atomic-layer resolution was demonstrated. Atomic scale contact or noncontact type surface scanning similar to that in atomic force microscopy was also performed with the gold tips.

scholarly journals Experimental observation of carousel-like phason flips in the decagonal quasicrystal Al60Cr20Fe10Si10

2021 ◽  
Vol 77 (5) ◽  
Author(s):  
Zhanbing He ◽  
Jean-Luc Maurice ◽  
Haikun Ma ◽  
Yanguo Wang ◽  
Hua Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Temperature ◽  
High Resolution ◽  
Translational Symmetry ◽  
Long Range Order ◽  
Decagonal Quasicrystal ◽  
Microscopy Imaging ◽  
Transmission Electron

Quasicrystals have special crystal structures with long-range order, but without translational symmetry. Unexpectedly, carousel-like successive flippings of groups of atoms inside the ∼2 nm decagonal structural subunits of the decagonal quasicrystal Al60Cr20Fe10Si10 were directly observed using in situ high-temperature high-resolution transmission electron microscopy imaging. The observed directionally successive phason flips occur mainly clockwise and occasionally anticlockwise. The origin of these directional phason flips is analyzed and discussed.

Atomic and Electronic Structures of Cu/Sapphire Interfaces by HRTEM and EELS Analyses

2005 ◽  
Vol 475-479 ◽  
pp. 3859-3862 ◽  
Author(s):  
Takeo Sasaki ◽  
Teruyasu Mizoguchi ◽  
Katsuyuki Matsunaga ◽  
Shingo Tanaka ◽  
Takahisa Yamamoto ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Energy Loss ◽  
Electronic Structures ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Deposition Technique ◽  
Transmission Electron ◽  
Electron Energy Loss

Interfacial atomic and electronic structures of Cu/Al2O3(0001) and Cu/Al2O3(11 ＿ ,20) prepared by a pulsed-laser deposition technique were characterized by high-resolution transmission electron microscopy (HRTEM) and electron energy-loss spectroscopy (EELS). It was found that both systems have O-terminated interfaces, irrespective of different substrate orientations. This indicates that Cu-O interactions across the interface play an important role for the Cu/Al2O3 systems.

Surface structure of (001) Au films by high resolution transmission electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 246-247
Author(s):  
William Krakow
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Atomic Layer ◽  
Surface Layers ◽  
Transmission Electron ◽  
Fcc Lattice ◽  
Unit Cells ◽  
Diffraction Patterns ◽  
Fractional Unit

In nonprimitive lattices, surface layers corresponding to partially filled unit cells give rise to reflections forbidden in the bulk structure. These reflections allow detailed studies of the surface layer by high resolution transmission electron microscopy and computer modeling experiments.The occurrence of fractional unit cells at the surface of (001) oriented Au films can be demonstrated by assembling the fcc lattice by the alternate stacking of planar {100} type layers such that the atoms of,each atomic layer are embedded in the depressions of neighboring planes above and below. The stacking sequence is of the ABABAB….type with the B layers shifted an amount ao/2 in the [100] direction (Fig. 1a). The presence of an excess A or B layer gives rise to additional reflections with mixed odd and even Miller indices which are forbidden in the fcc lattice, e.g., (110). In obtaining diffraction patterns from ∼100Å thick Au films the forbidden reflections were approximately 2% of the corresponding bulk lattice reflections and easily identified (see Fig. 1b).

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