Thermal cycling and the optical and electrical characterization of self-assembled multilayer Nile Blue A-gold thin films
Some laser applications produce high power densities that can be dangerous to equipment and operators. We have fabricated thin-film coatings by using molecular electrostatic self-assembly to create a spectrally selective absorbing coating that is able to withstand thermal fluctuations from -20 deg. C to 120 deg. C. We made the thin-film coatings by alternating deposition of an organic dye and gold colloidal nanoparticles onto glass substrates. Nile Blue A perchlorate, with a maximum absorbance slightly above 632 nm, was chosen as the organic dye. Strong coupling between the dye molecules and the gold nanoparticles provides a redshift that increases as the film's thickness is increased. The incorporation of the gold colloidal nanoparticles also decreases the resistivity of the film. The resistivity of the film was measured with a four-point probe and found to be {approx}10 {omega}/cm for the two samples measured. Atomic-force microscopy was used to show that film thickness increased 2.4nm per bilayer. The optical properties of the film were measured at the end of every 5 thermal cycles from -20 deg. C to 120 deg. C, and negligible degradation was observed after 30 cycles.
- OSTI ID:
- 20702658
- Journal Information:
- Applied Optics, Vol. 44, Issue 30; Other Information: DOI: 10.1364/AO.44.006357; (c) 2005 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
36 MATERIALS SCIENCE
ATOMIC FORCE MICROSCOPY
COATINGS
DEPOSITION
DYES
GLASS
GOLD
LASERS
NANOSTRUCTURES
OPTICAL PROPERTIES
PARTICLES
PERCHLORATES
PHYSICAL RADIATION EFFECTS
POWER DENSITY
STRONG-COUPLING MODEL
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL CYCLING
THICKNESS
THIN FILMS