High resolution electron microscopy of (SN)x

Abstract

Abstract:Pristine and iodinated (SN) x were studied by high resolution electron microscopy. High resolution electron micrographs showing lattice fringes up to 0.22 nm were obtained. In these electron micrographs, the texture of (SN) x crystals was elucidated to be fibrillar or mosaic; the lattice fringes were observed in domains extended along the molecular axis (b-axis) and very narrow in the perpendicular direction. Each crystallite varied from place to place in size but maintained the b-axis orientation. The high resolution image of iodinated (SN)x did not show directly the location of iodine atoms and their presence was deduced only from the optical transform of the image. The optical transform showed that iodine atoms were not intercalated uniformly, but locafized at the skin region on (SN)x fibers, where the crystal lattice was highly distorted. Then the iodination of (SN)x is supposed to result in the destruction of the crystal lattice by invasion of iodine atoms or to take place preferentially at a distorted crystal region.

Poly(sulfur nitride): The First Polymeric Metal

“…[33] Highresolution electron microscopy shows the microfibrillar morphology of (SN) x and also that crystals are composed of a large number of small, microtwinned crystallites. [34,35] A scanning tunneling microscopy image also revealed the surface microtwin (100) structure with a series of ridges along the chain axis. This twinning occurs less frequently in crystals grown using the Nakada method (Sec.…”

Some aspects of doping mechanism in Polyschwefelnitrid (SN)x

“…This means that the iodine atoms diffuse along the direction of the molecular chain at the largest rate. Moreover, the observation of lattice fringes by high resolution electron microscopy revealed that the size of fibrils is not uniform but varies widely from a single chain to a large single-crystal-like domain [14]. The (SN)x crystals comprise fine and long fibrils which are a few tens nm in lateral dimension and extended extremely in the direction of chain axis [5,13].…”

“…The (SN)x crystal has a fiber structure consisting of fine fibrils [2,13,14] and the electron diffraction pattern of (SN)x doped with halogen shows a characteristic feature [5,6]. From close examination of the Xray and electron diffraction patterns, it was found that the halogen atoms are localized in the disordered regions of the (SN)x matrix crystal and their localization is closely related to the fibrillar nature of crystals.…”