Carbon-based nanostructures obtained in water by ultrashort laser pulses

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Abstract

An ultrashort (100 fs) Ti:Sapphire pulsed laser has been employed in order toproduce nanostructures by pulsed ablation of a graphite target in water. Different (10-100-1000 Hz) repetition rates have been used, and the features of material produced have beeninvestigated by surface enhanced Raman spectroscopy (SERS) and scanning electron micro-scopy (SEM). SERS spectra show that a broad asymmetric band associated with diamond-likecarbon (DLC) is observed when repetition rates of 10 or 100 Hz are used. On the contrary,ablated species produced with 1 kHz pulses present a narrow peak at 1333 cm -1 , the typicalmode of diamond, which is, however, embedded in a DLC band centered at 1540 cm -1 . SEMimages show the presence of dispersed octahedral-shaped structures having a size from 1 to 5 ?m,in the case of 10 or 100 Hz repetition rates, and agglomerates of particles having a dimensionbelow 300 nm, when 1 kHz pulses are used.

Autore Pugliese

Tutti gli autori

  • A. Santagata; A. De Bonis; A. De Giacomo; M. Dell'Aglio; A. Laurita; G.S. Senesi; R. Gaudiuso; S. Orlando; R. Teghil and G.P Parisi

Titolo volume/Rivista

Journal of physical chemistry. C

Anno di pubblicazione

2011

ISSN

1932-7447

ISBN

Non Disponibile

Numero di citazioni Wos

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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