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Related Concept Videos

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Imagine taking a large number of identical...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Symmetry Elements in a Crystal

Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...
The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
Crystal Density01:19

Crystal Density

The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

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Wafer-Scale Synthesis of Aligned One-Dimensional Arsenene.

Xu Zhang1,2,3, Hongze Ji1, Lin Geng1

  • 1Division of Advanced Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.

Journal of the American Chemical Society
|November 20, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized one-dimensional (1D) arsenene within semiconducting single-walled carbon nanotubes (As@s-SWCNTs). This novel material assembly significantly enhanced field-effect transistor performance, achieving a 20-fold increase in on-state current.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Dimensionality significantly impacts material properties, necessitating controlled synthesis and assembly for research and applications.
  • One-dimensional (1D) materials offer unique electronic and structural characteristics.

Purpose of the Study:

  • To synthesize 1D arsenene within semiconducting single-walled carbon nanotubes (As@s-SWCNTs).
  • To develop wafer-scale aligned thin films of As@s-SWCNTs.
  • To investigate the charge transfer and device performance of the synthesized materials.

Main Methods:

  • Aberration-corrected scanning transmission electron microscopy (AC-STEM) for structural observation.
  • UV-visible-near-infrared (UV-vis-NIR) absorption spectroscopy for separation verification.
  • Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) for charge transfer analysis.
  • Dimension-limited self-alignment (DLSA) technique for thin film fabrication.

Main Results:

  • Successful synthesis of 1D arsenene encapsulated within single-walled carbon nanotubes (SWCNTs).
  • Observation of efficient filling and charge transfer between arsenene and SWCNTs.
  • Fabrication of wafer-scale aligned thin films using DLSA.
  • A nearly 20-fold increase in on-state current for aligned films in field-effect transistors compared to random films.

Conclusions:

  • The study demonstrates a novel method for synthesizing and assembling 1D arsenene within SWCNTs.
  • Charge transfer plays a crucial role in the properties of As@s-SWCNTs.
  • Aligned thin films of As@s-SWCNTs show significantly improved performance in field-effect transistors, highlighting potential for advanced electronic devices.