Photoconductivity of functionalized carbon nanotubes
Abaszade R.G. Mammadov A.G. Khanmamedova E.A. Aliyev F.G. Kotsyubynsky V.O. Gür E. Soltabayev B.D. Margitych M.O. Stetsenko M.O. Singh A. Arya S.
April - June 2024S.C. Virtual Company of Phisics S.R.L
Digest Journal of Nanomaterials and Biostructures
2024#19Issue 2837 - 843 pp.
Investigation of carbon nanotubes is a modern trend due to their combination of unique physical, chemical, electrical, and optical properties. Carboxyl-functionalized carbon nanotubes (fCNTs) for investigation of photoelectrical properties were synthesized. The photo-sensitivity spectra of a carboxyl-functionalized CNT sample for voltage range from 1 to 9 V, and for the spectral range from 400 to 900 nm were investigated. The voltage equal to 1 V generated lower photosensitivity in the broadband wavelength range for visible to near-infrared. The most efficient photocurrents of fCNTs were received for a voltage of 5 V in the wavelength range λp~400-800 nm and for voltage U=3V in the broadband spectral range λp~400-900 nm. The experimental data analysis helped to determine the widest photosensitivity range, as well as the highest sensitivity value. As result, the voltage U=5V was obtained. Here, the most significant photocurrent peak with Ip~2.67 μA for wavelength λ~720 nm was observed. A comparison between the photosensitivity spectra of fCNTs and pure CNTs shows that the photosensitivity of fCNTs has increased significantly. Thus, the maximum photosensitivity for fCNTs is Ip ~ 2.67 μA, and for pure CNTs, it equals Ip ~ 0.185 μA. A 14-fold enhancement of photosensitivity for fCNT has been registered. The mathematical analysis of spectral dependencies of generated photocurrents under different applied voltages can be described using fourth-order polynomials. The I-V characteristics for wavelengths 760 nm and 780 nm have the same trend with the shift of photocurrent maximum to the lower parameters of voltage. The carboxyl-functionalized nanotubes can be effectively used as light detectors and in optoelectronic applications.
Functionalized carbon nanotubes , Photocurrent , Photosensitivity
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Azerbaijan State Oil and Industry University, Baku, Azerbaijan
Azerbaijan University of Architecture and Construction, Baku, Azerbaijan
Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Kyiv, Ukraine
Eskisehir Osmangazi University, Eskisehir, 26040, Turkey
Nazarbayev University, Nur-Sultan, Astana, 010000, Kazakhstan
Kyiv Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, 03680, Ukraine
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
V.E. Lashkarev Institute of Semiconductor Physics, National Academy of Science of Ukraine, Kyiv, Ukraine
Department of Physics, University of Jammu, Jammu, 180006, India
Azerbaijan State Oil and Industry University
Azerbaijan University of Architecture and Construction
Vasyl Stefanyk Precarpathian National University
Eskisehir Osmangazi University
Nazarbayev University
Kyiv Institute for Nuclear Research
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
V.E. Lashkarev Institute of Semiconductor Physics
Department of Physics
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