K S MARTIROSYAN
Articles written in Bulletin of Materials Science
Volume 43 All articles Published: 12 August 2020 Article ID 0199
Diffuse spectra model of photoluminescence in carbon quantum dots
S E KUMEKOV N K SAITOVA K S MARTIROSYAN
The attractive aspect of excitation related to fluorescence nature in carbon quantum dots (CQD) has guided to several assumptions correlated with clusters size distribution, shapes as well as presence of different emissive states. Inthis study, a dimer–excimer model of photoluminescence (PL) in CQD describing discrete multiple electronic states for the excitation-dependent emission is described. The functional dependence of the characteristic width of the diffusespectra of PL on the size of a quantum dots are calculated. The effective width of PL spectrum can be tuned from 0.1 to 1 eV.
Volume 44 All articles Published: 19 November 2021 Article ID 0285
Twisted laminar superconducting composite: MgB$_2$ embedded carbon nanotube yarns
U LAMICHHANE G C DANNANGODA M A HOBOSYAN R A SHOHAN A ZAKHIDOV K S MARTIROSYAN
Twisted laminar superconducting composite structures based on multi-wall carbon nanotube (MWCNT)
yarns were crafted by integrating magnesium and boron homogeneous mixture into the carbon nanotube (CNT)
aerogel sheets. After the ignition of the Mg–B–MWCNT system, under the controlled argon environment, the
high exothermic reaction between magnesium (Mg) and boron (B) with stoichiometric ratio produced the
MgB$_2$@MWCNT superconducting composite yarns. The process was conducted under the controlled argon environment
and uniform heating rate in the differential scanning calorimetry and thermogravimetric analyzer.
The XRD analysis confirmed that the produced composite yarns contain nano and microscale inclusions
of superconducting phase of MgB$_2$. The mechanical properties of the composite twisted and coiled yarns
at room temperature were characterized. The tensile strength up to 200 MPa and Young’s modulus of 1.27 GPa
proved that MgB$_2$@MWCNT composite is much stiffer than single component MgB$_2$ wires. The superconductive
critical temperature of
Volume 45, 2022
All articles
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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