HIGH RESOLUTION STUDIES OF SMALL PARTICLES OF GOLD AND SILVER II. Single crystals, lamellar twins and polyparticles
نویسنده
چکیده
Axial illumination lattice imaging with a high resolution electron microscope has been used to characterise directly the structures of complicated particles of silver and gold found in the early stages of particulate growth. Many of the particles are conveniently classified under a new, broad heading of “polyparticles”, indicating their similarity to polycrystals. Whereas the latter are composed of single crystals, the former are constructed from smaller discrete particles (e.g. icosahedral multiply-twinned particles).
منابع مشابه
Direct lattice imaging of small metal particles
Observations on small vapour-deposited particles of silver and gold with direct lattice imaging in the Cambridge University 600 kV high-resolution electron microscope have established unambiguously the presence of dislocations in particles as small as 15nm in diameter. The detailed structure of more complicated ' polyparticles ' can also be characterized directly. Knowledge of the internal and ...
متن کاملBacterial Synthesis of Anisotropic Metal Nanoparticles
This chapter describes the biological synthesis of anisotropic metal nanoparticles using the bacterium Actinobacter spp. The biogenic gold nanoparticles thus synthesized show triangular and hexagonal morphology with edge lengths between 0.05 μm to 2 μm. The surface topography of triangular gold particles indicated that they are ~ 9 nm thick. These flat particles show a strong absorption in the ...
متن کاملHIGH RESOLUTION STUDIES OF SMALL PARTICLES OF GOLD AND SILVER I. Multiply-twinned particles
The structure of multiply-twinned particles of gold and silver found in the early stages ofparticulate growth has been studied using direct lattice imaging methods with the Cambridge University 600 kV high resolution electron microscope. There was widespread evidence for the presence of strain-relieving partial dislocations in icosahedral particles. However, the possibility of imaging artefacts...
متن کاملEffect of Size, Shape, Composition, and Support Film on Localized Surface Plasmon Resonance Frequency: A Single Particle Approach Applied to Silver Bipyramids and Gold and Silver Nanocubes
Localized surface plasmon resonances (LSPR), collective electron oscillations in nanoparticles, are being heavily scrutinized for applications in chemical and biological sensing, as well as in prototype nanophotonic devices. This phenomenon exhibits an acute dependence on the particle’s size, shape, composition, and environment. The detailed characterization of the structure-function relationsh...
متن کاملبررسیهای ژئوشیمیایی، کانیشناسی و کانیسازی سولفیدی در رگه های کوارتز جنوب مشهد
Shelgerd area is located south of Mashhad, N.E of Iran, within Binalud Structural Zone. This region is affected by regional metamorphism, slate and phylite are the main metamorphic rocks of the area. Teriassic slate, phyllite, sandstone and Jurassic conglomerates crop out parallel to Sang bast- Shandize fault. Mineralization occurred as vein type, with trend of N65E to N50W with 75 degrees to t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2011