Femtosecond-laser nanostructuring of black diamond films under different gas environments

Year: 2020

Authors: Girolami M., Bellucci A., Mastellone M., Orlando S., Serpente V., Valentini V., Polini R., Sani E., De Caro T., Trucchi D. M.

Sani E.,

Autors Affiliation: CNR, ISM, Ist Struttura Mat, DiaTHEMA Lab, Via Salaria Km 29,300, I-00015 Rome, Italy; Univ Roma La Sapienza, Dipartimento Sci Base & Applicate Ingn, Piazzale Aldo Moro 5, I-00185 Rome, Italy; CNR, ISM, Ist Struttura Mat, I-85050 Potenza, Italy; Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, Via Ric Sci 1, I-00133 Rome, Italy; CNR, INO, Ist Nazl Ott, I-50125 Florence, Italy; CNR, ISMN, Ist Studio Mat Nanostrutturati, Via Salaria Km 29,300 Monterotondo Stn, I-00015 Rome, Italy.

Abstract: Irradiation of diamond with femtosecond (fs) laser pulses in ultra-high vacuum (UHV)
conditions results in the formation of surface periodic nanostructures able to strongly interact
with visible and infrared light. As a result, native transparent diamond turns into a completely
di erent material, namely “black” diamond, with outstanding absorptance properties in the solar
radiation wavelength range, which can be eciently exploited in innovative solar energy converters.
Of course, even if extremely e ective, the use of UHV strongly complicates the fabrication process.
In this work, in order to pave the way to an easier and more cost-e ective manufacturing workflow
of black diamond, we demonstrate that it is possible to ensure the same optical properties as
those of UHV-fabricated films by performing an fs-laser nanostructuring at ambient conditions
(i.e., room temperature and atmospheric pressure) under a constant He flow, as inferred from the
combined use of scanning electron microscopy, Raman spectroscopy, and spectrophotometry analysis.
Conversely, if the laser treatment is performed under a compressed air flow, or a N2 flow, the optical
properties of black diamond films are not comparable to those of their UHV-fabricated counterparts.

Journal/Review: MATERIALS

Volume: 13 (24)      Pages from: 5761-1  to: 5761-12

KeyWords: femtosecond laser; diamond; black diamond; nanostructures; optical properties;
Raman spectroscopy; solar absorptance
DOI: 10.3390/ma13245761

Citations: 5
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