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Formula: Au
Form: Foil (Light Tight)
Material: Gold
CAS Number: 7440-57-5
Commodity: Precious Metals
Light Tight: Light Tight
Gold Foil (Light Tight) is a key material in scientific research, particularly for electrochemical and surface science applications. Its excellent electrical conductivity and high reflectivity make it ideal for experiments in photoelectron spectroscopy, X-ray absorption fine structure (XAFS), and surface plasmon resonance (SPR). The foil’s light-tight properties are crucial for minimizing interference in sensitive laboratory measurements, such as those involving electrochemical impedance spectroscopy (EIS) and bioelectrochemical systems. Gold foil is commonly used in the development of highly precise sensors, as it ensures stable and reproducible results. Its applications extend to renewable energy research, particularly in energy storage systems, where consistent surface interactions are critical for performance.
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Material Properties for Precious Metals

Atomic Properties
Element Value
Atomic number 79
Crystal structure Face centred cubic
Electronic structure Xe 4f¹⁴ 5d¹⁰ 6s¹
Valences shown 1,3
Atomic weight( amu ) 196.9665
Thermal neutron absorption cross-section( Barns ) 98.8
Photo-electric work function( eV ) 4.8
Atomic radius - Goldschmidt( nm ) 0.144
Ionisation potential( No./eV ) 1/ 9.22
Ionisation potential( No./eV ) 2/ 20.5
Mechanical Properties
Element Value
Material condition Soft
Material condition Hard
Poisson's ratio 0.42
Poisson's ratio 0.42
Bulk modulus( GPa ) 171
Bulk modulus( GPa ) 171
Tensile modulus( GPa ) 78.5
Tensile modulus( GPa ) 78.5
Hardness - Vickers( kgf mm⁻² ) 20-30
Hardness - Vickers( kgf mm⁻² ) 60
Tensile strength( MPa ) 130
Tensile strength( MPa ) 220
Yield strength( MPa ) 205
Yield strength( MPa ) -
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 2.20@20@20°C
Temperature coefficient( K⁻¹ ) 0.004@0-100°C
Thermal emf against Pt (cold 0C - hot 100C)( mV ) 0.74
Physical Properties
Element Value
Boiling point( C ) 3080
Density( gcm⁻³ ) 19.3@20°C
Thermal Properties
Element Value
Melting point( C ) 1064.4
Latent heat of evaporation( J g⁻¹ ) 1738
Latent heat of fusion( J g⁻¹ ) 64.9
Specific heat( J K⁻¹ kg⁻¹ ) 129@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 318@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 14.1@0-100°C

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