CC BY
0Formation, stabilization and orientation of linear carbon chains using arc discharge and laser radiation
A. Osipov*, V. Samyshkin, A. Kucherik, A. Abramov
Vladimir State University, Russia
* osipov@vlsu.ru
We present a method of synthesis of sp-carbon allotropes or carbynes. Linear chains of carbon atoms are obtained from graphite placed in a joint field of laser plasma and arc discharge. The combined action of laser and arc discharge allows to create conditions for the formation of a variety of carbon allotropes, whose structural composition is governed by the interplay of external fields. The stabilization of the obtained structures realizes in water by attaching them to gold nanoparticles (NPs) by means of the laser ablation process. Resulting nanoobjects represent pairs of NPs connected by multiple straight carbon chains of several nanometer lengths. If NPs at the opposite ends of a chain differ in size, the structure acquires a dipole moment due to the difference in work functions of the two NPs. We take advantage of the dipole polarisation of carbon chains for ordering them by the external electric field. We deposit them on a glass substrate by the sputtering method in the presence of static electric fields of magnitudes up to 105 V/m. The formation of one-dimensional carbyne quasi-crystals deposited on a substrate is evidenced by high-resolution TEM and X-ray diffraction measurements. The original kinetic model describing the dynamics of ballistically flowing nano-dipoles reproduces the experimental diagram of orientation of the deposited chains. The method may be employed in the mass production of sp- and sp2-hybridized carbon for the needs of possible applications in micro and nanoelectronics, biosensing.
We have developed an experimental setup based on a combined effect of an electric arc discharge and laser irradiation on a fluid containing carbon and Au NPs. By optimization of the setup we have found a regime allowing for predominant synthesis of sp- or sp2-carbon nanostructures. The combined effect of an electric arc discharge and laser field offers a powerful tool for the synthesis of sp-carbon in liquid media, as confirmed by our Raman spectroscopy data. It is important to note that the presence of stabilizing metal nanoparticles is strongly essential stabilization of linear carbon formation. We have successfully deposited the synthesised polyyne chains on a gold platinum grid. High resolution TEM images confirm formations of a multitude of linear carbon chains attached to gold nanoparticles.
This work was supported by RSF-Grant No. 23-12-20004.
