scholarly journals Structural and Magnetoresistance Properties of Transfer-Free Amorphous Carbon Thin Films

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 124
Author(s):  
Awais Saleemi ◽  
Ali Abdullah ◽  
Muhammad Saeed ◽  
M. Anis-ur-Rehman ◽  
Ayyaz Mahmood ◽  
...  
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Materials Science ◽  
Physical Property Measurement System ◽  
Chemical Vapor ◽  
Physical Property ◽  
Interesting Phenomenon ◽  
Sio2 Substrate ◽  
Carbon Thin Films ◽  
Cost Efficient

The control of the morphologies and thus the optical, electrical, and magnetic effect of 2D thin films is a challenging task for the development of cost-efficient devices. In particular, the angular dependent magnetoresistance (MR) of surface thin films up to room temperature is an interesting phenomenon in materials science. Here, we report amorphous carbon thin films fabricated through chemical vapor deposition at a SiO2 substrate. Their structural and angular magnetoresistance properties were investigated by several analytical tools. Specifically, we used a physical property measurement system to estimate the magnitude of the angular MR of these as-prepared sample thin films from 2 K to 300 K. An angular MR magnitude of 1.6% for the undoped a-carbon thin films was found up to 300 K. Under the magnetic field of 7 T, these films possessed an angular MR of 15% at a low temperature of 2 K. A high disorder degree leads to a large magnitude of MR. The grain boundary scattering model was used to interpret the mechanism of this angular MR.

scholarly journals Substrate Impact on MR Characteristics of Carbon Nano Films Explored via AFM and Raman Analysis

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3649
Author(s):  
Awais Siddique Saleemi ◽  
Muhammad Hafeez ◽  
Muhammad Saeed ◽  
Ali Abdullah ◽  
Muhammad Anis-ur- Rehman ◽  
...  
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Structural Changes ◽  
Materials Science ◽  
Laser Energy ◽  
Laser Frequency ◽  
Atomic Ratio ◽  
Magnetic Sensors ◽  
Sio2 Substrate ◽  
Thin Film Fabrication

Recent advances in the fabrication and classification of amorphous carbon (a-Carbon) thin films play an active part in the field of surface materials science. In this paper, a pulsed laser deposition (PLD) technique through controlling experimental parameters, including deposition time/temperature and laser energy/frequency, has been employed to examine the substrate effect of amorphous carbon thin film fabrication over SiO2 and glass substrates. In this paper, we have examined the structural and magnetoresistance (MR) properties of these thin films. The intensity ratio of the G-band and D-band (ID/IG) were 1.1 and 2.4, where the C(sp2) atomic ratio for the thin films samples that were prepared on glass and SiO2 substrates, were observed as 65% and 85%, respectively. The MR properties were examined under a magnetic field ranging from −9 T to 9 T within a 2-K to 40-K temperature range. A positive MR value of 15% was examined at a low temperature of 2 K for the thin films grown on SiO2 substrate at a growth temperature of 400 °C using a 300 mJ/pulse laser frequency. The structural changes may tune the magnetoresistance properties of these a-Carbon materials. These results were demonstrated to be highly promising for carbon-based spintronics and magnetic sensors.

The Effect of Camphor Oil Amounts on the Properties of Amorphous Carbon Thin Films by Thermal Chemical Vapor Deposition

2012 ◽  
Vol 576 ◽  
pp. 611-614
Author(s):  
K. Dayana ◽  
A.N. Fadzilah ◽  
Mohamad Rusop
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Chemical Vapor Deposition ◽  
Amorphous Carbon ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Thermal Chemical Vapor Deposition ◽  
Current Voltage ◽  
Carbon Thin Films ◽  
Camphor Oil

Amorphous carbon thin films have been deposited by a simple Thermal Chemical Vapor Deposition (CVD) with varying the amount of natural precursor (camphor oil) onto the glass substrates. In this work, we have investigated the effect of different amount of camphor oil on the evolution of electrical conductivity and the optical and structural properties of amorphous carbon thin films. The amorphous carbon thin films were characterized by using current-voltage (I-V) measurement, UV-VIS-NIR spectroscopy and Raman spectroscopy. The current-voltage (I-V) study reveals that the highest electrical conductivity was deposited at 3 ml camphor oil. The optical band gap is almost unchanged with the increase of camphor oil amount. Raman result indicates that amorphous carbon thin films consists a mixture of sp2 and sp3 bonded carbon atoms.

Iodine Doping of Amorphous Carbon Thin Films Deposited by Thermal CVD

2012 ◽  
Vol 626 ◽  
pp. 834-838 ◽  
Author(s):  
K. Dayana ◽  
A.N. Fadzilah ◽  
Mohamad Rusop
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Chemical Vapor ◽  
Nir Spectroscopy ◽  
Chemical Vapor Deposition Method ◽  
Iodine Doping ◽  
Glass Substrates ◽  
Current Voltage ◽  
Carbon Thin Films ◽  
Natural Precursor

A simple thermal chemical vapor deposition method is employed for the deposition of amorphous carbon thin films by natural precursor camphor oil onto the glass substrates and the iodine doping process. In this work, we have studied the effect of iodine doping on the evolution of electrical properties and the optical and structural properties of amorphous carbon thin films. The amorphous carbon thin films were characterized by using Raman spectroscopy, UV-VIS-NIR spectroscopy, current-voltage (I-V) measurement, Fourier transform infrared (FTIR) and FESEM. The I-V study reveals that the electrical conductivity was increased with the iodine doping. The iodine doped thin films induced graphitization by decreasing the optical band gap. Raman and FTIR result indicates that amorphous carbon thin films consist of a mixture of sp2 and sp3 bonded carbon atoms. The FESEM shows the amorphous nature of the thin films.

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