Gold Foil (Light Tight)

Formula: Au

Form: Foil (Light Tight)

Material: Gold

CAS Number: 7440-57-5

Commodity: Precious Metals

Light Tight: Light Tight

Goodfellow provides light-tight gold foil with a maximum purity of 99.999% (5N). This specialized form combines gold's excellent conductivity and chemical stability with light-blocking capabilities. It's particularly valuable in applications requiring both high performance and protection from light interference, such as in sensitive electronic and optical devices. In scientific research, it's crucial for experiments involving photosensitive materials and in the development of advanced plasmonic devices. The foil's high purity ensures minimal contamination in sensitive measurements, making it ideal for use in quantum optics and nanophotonics research. Its potential in developing next-generation sensors and biomedical devices highlights its significance in cutting-edge research and technology development.

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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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Gold Foil (Light Tight)

Material Properties for Precious Metals