Effect of Electrolyte Type on Properties of Diamond - like Carbon Films Electrodeposited onto N-Type Si Substrate, Appli
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ORIGINAL PAPER
Effect of Electrolyte Type on Properties of Diamond - like Carbon Films Electrodeposited onto N-Type Si Substrate, Application as Electrode for Supercapacitors Nacera Rachedi 1,2 & Toufik Hadjersi 1 & Fatsah Moulai 1 & Nahed Dokhane 2 & Amar Manseri 1 & Sihem Bouanik 1 Received: 24 July 2019 / Accepted: 25 November 2019 # Springer Nature B.V. 2019
Abstract In this work, diamond-like carbon (DLC) thin films were successfully electrodeposited onto n-type Si(100) substrate using three types of organic electrolyte (as carbon precursor) namely dimethylsulfoxide (C2H6OS), acetonitrile (CH3CN) and ethanol (CH2CH2OH). The effect of electrolyte type on morphological, structural and chemical properties was investigated using Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray and X-ray diffraction (XRD). The DLC films Raman spectra show the films are amorphous and the more disorder film is obtained by dimethylsulfoxide (DMSO). These results were confirmed by energy dispersive X-ray and XRD techniques. The SEM observations show that the DLC films were uniformly deposited on the whole Si substrate surface and that it contains of compact and small spherical grains with uniform distribution. Moreover, it was found that the DLC film obtained from a DMSO electrolyte is more conductive, which enables it to be more favorable for the fabrication of a good supercapacitor electrode. The study of electrochemical properties of Si and DLC/Si electrode has shown that the deposition of DLC films from DMSO electrolyte remarkably improves the electrochemical activity of Si electrode and the specific capacitance. Indeed, it allows to get a specific capacitance of 17 mF/cm2 in KOH aqueous solution at scan rate of 5 mV/s with capacitance retention of 95% after 4000 cycles. Thus, the deposition of DLC film from DMSO electrolyte onto silicon substrate can be considered as a simple and economical method to fabricate of a performant electrode of supercapacitors. Keywords Diamond-like carbon . Thin films . Electrodeposition . Specifique capacitance . Supercapacitors
1 Introduction Diamond-like carbon (DLC) films represent a promising material and are the subject of large scientific studies due to its unique properties, such as high mechanical hardness, good wear resistance, optical transparency, chemical inertness and low friction coefficients. They can be used in different fields such as in biomedical application, optical devices and
* Nacera Rachedi [email protected] * Fatsah Moulai [email protected] 1
Research Center in Semi-conductors Technology for Energetic (CRTSE), 2, Bvd. Frantz Fanon, B.P. 140 Alger-7 Merveilles, Algiers, Algeria
2
Department of Physics, University of Boumerdes, Boumerdes, Algeria
magnetic storage [1, 2], solar cells [3] and supercapacitors [4]. Several methods were proposed to prepare the DLC thin films, such as electrodeposition, pulsed laser ablation, physical vapor deposition and chemical vapor deposition [5–9]. Usually, the electrodeposition is the preferred co
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