SEM specimens being coated with layer of gold

Numéro d’image : 11832520
SEM specimens being coated with layer of gold
Specimen preparation. Two insects being coated with gold prior to analysis with a scanning electron microscope (SEM). The coating is to improve their electrical conductivity and their ability to reflect electrons and hence provide clear images. The layer of gold (5-10 nanometres thick) is deposited by a process called sputter coating. A plate (upper centre) of pure gold is positioned above the microchip within a vacuum chamber containing argon gas. An applied voltage causes ionisation of the argon with subsequent ionisation of some of the gold atoms. Gold ions stream down onto the specimen to form a uniform layer. The ion plasma causes the bright glow
Licence : Droits gérés
Crédit: Science Photo Library / Goetgheluck, Pascal
Taille de l’image : 3971 px × 5184 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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