Vol. 25 No. 3 (2026): Mapana Journal of Sciences
Research Articles

Chitosan, a semi-synthetic polymer driven electrical and third-order nonlinear optical enhancement of SrTiO3 perovskite

  • R Sridevi,
  • M Suganya,
  • M Sriramraj,
  • A Vinith,
  • V Rajamani,
  • N Arunkumar,
  • A R Balu
R Sridevi
PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamil Nadu, India
M Suganya
PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamil Nadu, India
M Sriramraj
PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamil Nadu, India
A Vinith
PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamil Nadu, India
V Rajamani
PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamil Nadu, India
N Arunkumar
PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamil Nadu, India
A R Balu
PG and Research Department of Physics, AVVM Sri Pushpam College (Affiliated to Bharathidasan University, Tiruchirappalli), Poondi, Tamil Nadu, India
DOI: https://doi.org/10.12723/mjs.78.4

Published 2026-09-18

Keywords

  • Perovskite,
  • chitosan,
  • NLO properties,
  • Z-scan,
  • susceptibility

Copyright (c) 2026

Creative Commons License

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Abstract

The chemical precipitation method was employed to synthesize SrTiO3 (ST) and chitosan-loaded SrTiO3 (CST) NPs. Cubic crystal structures with substantial (1 1 0) preferential development are seen in both ST and CST.  The band gaps calculated were 3.19 and 3.07 eV, respectively, for ST and CST. The sheet resistance (Rsh), resistivity (ρ) values of ST and CST were 8.6 x 104 Ω/cm, 3.56 x 101 Ω/cm and, 2.68 x 102 Ω/cm, 1.95 x 10-1 Ω/cm, respectively. From the Z- scan studies, the negative nonlinear refractive index that both samples display on closed aperture curves indicates that they are self-defocusing, with two-photon absorption, ST and CST’s open aperture curves are reverse saturable. Chitosan loading enhanced SrTiO3’s nonlinear refractive index from 4.85 to 5.88 x 10-8 cm2/W, absorption coefficient from 2.02 to 2.97 x 10-6 cm/W, respectively. A high third-order nonlinear susceptibility (3.99 x 10-6 esu) realized for CST confirmed its utility in optical switching devices.

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