Abstract:
A colloidal suspension of hollow aluminium, cap-shaped nanoparticles (‘nano-caps’) can be
conveniently produced by evaporation of aluminium onto a spin-coated layer of polystyrene nanoparticles (PSNPs),
followed by sonication and dissolution of the polymer template. Although ordinary spherical aluminium
nanoparticles have a plasmon resonance in the ultra-violet, the ‘nano-caps’ show plasmon absorption between 700
and 1200 nm due to their geometry. The position of their extinction peaks can be tuned by varying the thickness of
the aluminium and the shape of the nano-cap. The optical properties of these shapes were modelled using the
Discrete Dipole Approximation method, which confirmed that the ‘caps’ have very significantly red-shifted
absorbance and scattering compared to spheres. This finding suggests that aluminium nano-caps might compete with
gold and silver nanoparticles in applications requiring absorption in the near infrared.
