Carbon nanocrystals produced by pulsed laser ablation of carbon

Abstract

Plasma laser ablation experiments were performed irradiating glassy-carbon targets placed in vacuum through a pulsed Nd:YAG laser operating at the second harmonic (532 nm), 9 ns pulse width and 10 9 W/cm 2 density power.Thin films of ablated carbon were deposited on silicon oxide substrates placed at different distances and angles with respect to the target.The analysis of the deposited material was carried out by using surface profiler, scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and Raman spectroscopy.Results show the evidence of carbon nanocrystals and nanostructures with dimension of the order of 100 nm deposited on the substrates together with a large amount of amorphous phase. The spectroscopic investigations and the SEM images indicate the formation of nanodiamond seeds as a nucleation process induced on the substrate surface. Nanostructures were investigated as a function of the laser intensity and angle distribution. Experimental results were compared with the literature data coming from nanodiamonds growth with different techniques.Experiments performed at Instituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) of Catania (Italy) and data analysis conducted at Dipartimento di Fisica and DFMTA of the Università of Messina (Italy), CNR-ITIS of Messina and ST-Microelectronics of Catania will be presented and discussed.

Rational Synthesis, Characterization, and Application of Environmentally‐Friendly (Polymer‐Carbon Dot) Hybrid Composite Film for Fast and Efficient UV Assisted Cd2+ removal from water

“…On the contrary, the IG/ID of PC (1.1) was significantly smaller than CDs, implying its successful conversion to CDs. The determined IG/ID of our newly synthesized CDs was higher than previously reported works [50,51].…”

Energy distributions of particles ejected from laser-generated pulsed plasmas

“…Thin films deposition by PLA and ions injection by LIS represent only two of many possible applications, whereas the energy distributions of neutral and ion species emitted from the laser-generated plasma become critical parameters in order to control and to optimise the application. Energetic ions, for example, permit to induce ion implantation effects in the exposed surfaces, improving the film-substrate adhesion, or to induce activation and growth of nanocrystals [2]. Neutrals characterize the fractional ionisation of the plasma and have an important role in the plasma properties (temperature, density, ion neutralization, charge exchange and ionisation processes, etc.).…”

Simultaneous electrochemical determination of epinephrine and uric acid in the presence of ascorbic acid using SnO2/graphene nanocomposite modified glassy carbon electrode

“…It is well known [27,28] that the typical features of carbon materials in Raman spectra are: i) the G band at 1580 cm −1 deriving from the E 2g phonon of C sp 2 atoms; the D band at 1350 cm -1 related to the breathing mode of the C hexagonal ring and assigned to local defects and disorder mostly at the edges of GO-SnO 2 platelet. Raman spectra of SnO 2 , GO and GO-SnO 2 hybrid materials were shown in Fig.…”