Hierarchical 2D Mn–Co–Te nanocomposites for visible light photodetector and nonlinear applications: insights from experiment and DFT
5 affiliations
- 1Department of Engineering and Materials Physics, Institute of Chemical Technology-Indian Oil Odisha Campus Bhubaneswar 751013 India
- 2Department of Applied Physics and Ballistics, Fakir Mohan University Balasore 756019 India
- 3Department of Physics and Astrophysics, University of Delhi Delhi-110007 India
- 4Department of Physics, Centre of Excellence in High Energy and Condensed Matter Physics, Utkal University Bhubaneswar 751004 India
- 5Department of Physics, Nitte Meenakshi Institute of Technology (NMIT), Nitte (Deemed to be University) Bengaluru 560064 India
Abstract
MnTe and CoTe have attracted significant attention in the field of optoelectronics due to their promising electronic and optical properties. In the present work, ternary Mn–Co–Te nanocomposites with varying Mn and Co concentrations were successfully synthesized via a hydrothermal approach to investigate the compositional influence on their structural, optical, photoresponsive, and nonlinear optical properties. From X-ray diffraction (XRD) analysis, the crystallite size was found to decrease from 30.244 to 17.370 nm with decreasing Mn concentration, while Raman spectroscopy revealed the characteristic vibrational mode associated with Te–Te bonding. Field emission scanning electron microscopy (FESEM) demonstrated the formation of hierarchical nanosheet-like structures embedded with nanoparticles, whereas X-ray photoelectron spectroscopy (XPS) studies confirmed the surface chemical states and elemental composition of the synthesized composites. Optical investigations revealed a gradual increase in the direct bandgap energy from 2.74 to 3.34 eV with increasing Co concentration. Photoresponse measurements showed significant photocurrent enhancement under illumination, with the Mn-rich sample (MCT-1) exhibiting the highest photocurrent value of 104.06 mA. Furthermore, nonlinear optical studies carried out using the Z-scan technique demonstrated prominent reverse saturable absorption (RSA) behavior along with positive nonlinear refractive index values. The calculated third-order nonlinear susceptibility was found to be of the order of 10−10 esu, confirming strong nonlinear optical activity. These results suggest that Mn–Co–Te nanocomposites are promising materials for optoelectronic and nonlinear photonic applications.
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BibTeX
@article{supriya2026hierarchical,
title = {{Hierarchical 2D Mn–Co–Te nanocomposites for visible light photodetector and nonlinear applications: insights from experiment and DFT}},
author = {Swikruti Supriya and Sasmita Swain and Rojalin Swain and Jagadish Kumar and D. Alagarasan and Ramakanta Naik},
journal = {Nanoscale Advances},
year = {2026},
month = oct,
doi = {10.1039/d6na00685j},
url = {https://doi.org/10.1039/d6na00685j},
note = {CC BY-NC 3.0},
}
RIS
TY - JOUR
TI - Hierarchical 2D Mn–Co–Te nanocomposites for visible light photodetector and nonlinear applications: insights from experiment and DFT
AU - Swikruti Supriya
AU - Sasmita Swain
AU - Rojalin Swain
AU - Jagadish Kumar
AU - D. Alagarasan
AU - Ramakanta Naik
PY - 2026
DA - 2026/10/06
JO - Nanoscale Advances
DO - 10.1039/d6na00685j
UR - https://doi.org/10.1039/d6na00685j
AB - MnTe and CoTe have attracted significant attention in the field of optoelectronics due to their promising electronic and optical properties. In the present work, ternary Mn–Co–Te nanocomposites with varying Mn and Co concentrations were successfully synthesized via a hydrothermal approach to investigate the compositional influence on their structural, optical, photoresponsive, and nonlinear optical properties. From X-ray diffraction (XRD) analysis, the crystallite size was found to decrease from 30.244 to 17.370 nm with decreasing Mn concentration, while Raman spectroscopy revealed the characteristic vibrational mode associated with Te–Te bonding. Field emission scanning electron microscopy (FESEM) demonstrated the formation of hierarchical nanosheet-like structures embedded with nanoparticles, whereas X-ray photoelectron spectroscopy (XPS) studies confirmed the surface chemical states and elemental composition of the synthesized composites. Optical investigations revealed a gradual increase in the direct bandgap energy from 2.74 to 3.34 eV with increasing Co concentration. Photoresponse measurements showed significant photocurrent enhancement under illumination, with the Mn-rich sample (MCT-1) exhibiting the highest photocurrent value of 104.06 mA. Furthermore, nonlinear optical studies carried out using the Z-scan technique demonstrated prominent reverse saturable absorption (RSA) behavior along with positive nonlinear refractive index values. The calculated third-order nonlinear susceptibility was found to be of the order of 10−10 esu, confirming strong nonlinear optical activity. These results suggest that Mn–Co–Te nanocomposites are promising materials for optoelectronic and nonlinear photonic applications.
SN - 2516-0230
ER -