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Gold nanoparticles (AuNPs) functionalized with PEG (polyethylene glycol) and amino groups (NH2), specifically described as Au-PEG1000-NH2 (40nm), represent a type of gold nanoparticle coated with PEG molecules that have amino functional groups attached. Here's what each component signifies:

• Gold Nanoparticles (AuNPs): These are particles of gold with nanometer-scale dimensions, often used in various applications due to their unique optical, electronic, and catalytic properties at the nanoscale.

• PEG (Polyethylene Glycol): PEG is a polymer widely used in nanotechnology and biomedicine due to its biocompatibility and ability to improve the stability and solubility of nanoparticles. In this context, Au-PEG1000 refers to PEG molecules with a molecular weight (MW) of 1000.

• Amino Groups (NH2): These are functional groups containing nitrogen and hydrogen, known for their ability to bind with other molecules or surfaces through chemical reactions like amide formation or hydrogen bonding.

The specific description "Au-PEG1000-NH2 (40nm)" indicates that these gold nanoparticles have a size of 40 nanometers and are functionalized with PEG chains of MW 1000 and amino groups.

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