Silicon Nitride (SiN) membrane grids

Silicon Nitride (SiN) membrane grids are advanced specimen support platforms used in Transmission Electron Microscopy (TEM) and other high-resolution imaging techniques, providing an ultra-clean, chemically inert, and mechanically robust substrate for nanoscale materials and biological specimens.

 Exceptionally strong and capable of withstanding temperatures in excess of 1000 °C, SiN grids are ideally suited to dynamic in-situ experiments where processes are observed in real time within the microscope. 

Their non-carbon composition delivers a low-background signal, making them particularly advantageous for elemental analysis techniques such as Energy-Dispersive X-ray Spectroscopy (EDS) and Electron Energy Loss Spectroscopy (EELS).

 

Core Purpose

• Carbon-Free Imaging: Unlike traditional carbon-coated grids, they provide a carbon-free background, making them essential for quantitative carbon analysis and energy-dispersive X-ray (EDX) spectroscopy.
• Thermal & Chemical Stability: They can withstand temperatures exceeding 1000°C and are resistant to most acids, bases, and solvents (except hydrofluoric acid), allowing for in situ experiments under extreme conditions.
• High Resolution: Their ultra-flat, amorphous nature reduces electron scattering and chromatic blur, enabling atomic-level resolution.  

 

Key Applications

• Materials Science:
  Nanoparticle Characterisation: Ideal for imaging nanotubes, 2D materials (like graphene), and nanowires without background interference.
  Crystal Growth: Used as a platform to observe real-time chemical reactions and crystal growth directly on the membrane.
• Life Sciences:
  Cell Culturing: The membranes are biocompatible and robust enough for eukaryotic cells to be cultured directly on them for imaging.
  Cryo-Electron Microscopy (Cryo-EM): Used to support viral particles and proteins, often providing better contrast than holey carbon films.
• Multi-Modal Analysis:
  Correlative Microscopy: Their mechanical stability allows the same sample to be analysed across multiple platforms, including SEM, AFM, Raman spectroscopy, and XRD.
• Environmental Chambers:
  In-situ Liquid & Gas Cells: Used to create sealed windows for observing samples in liquid or gas environments within the vacuum of an electron microscope.