Moth-eye effect in hierarchical carbon nanotube anti-reflective coatings
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Optical anti-reflection is achieved in natural surfaces by exploiting hierarchical surface morphology. Here, we show that single-walled carbon nanotube (SWCNT) coatings deposited on silicon (Si) realize a broad-band, omnidirectional, and nearly polarization-independent suppression of Si optical reflection, with an increase of film absorption. This is attributed to a biomimetic, hierarchical surface morphology, which introduces a graded refractive index— the so-called moth-eye effect. Moreover, the anti-reflective behavior can be tuned by varying the SWCNT film thickness. The SWCNT random networks are realized by a simple, rapid, reproducible, and inexpensive solution-processing technique and deposited on Si by a dry-transfer printing method, at room temperature. The technology may be used to coat arbitrary substrates such as optical instruments, radiometric applications, light and thermal sensors, solar cells, and light emitting diodes; thus improving the device absorption or emission of light, due to the film optical properties.
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|Item Type:||Journal Article|
|Keywords:||Single-walled carbon nanotube films; Anti-reflective coatings; Silicon; Moth-eye effect; Graded-index; Biomimetics; Ultra-black; Hierarchical morphology|
|Subjects:||Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Optical Physics not elsewhere classified (020599)|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Facilities:||Science and Engineering Centre, Central Analytical Research Facility|
|Copyright Owner:||Copyright 2016 Elsevier Ltd.|
|Deposited On:||17 Jul 2016 22:34|
|Last Modified:||24 Jul 2016 04:04|
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