Low Cost, Flexible, Perovskite BaTiO 3 Nanofibers‐Based p–n Homojunction for Multifunctional Sensing of Physical and Chemical Stimuli

Veeralingam, Sushmitha and Ravindranath, Ajay Narayan Konda and Badhulika, Sushmee (2020) Low Cost, Flexible, Perovskite BaTiO 3 Nanofibers‐Based p–n Homojunction for Multifunctional Sensing of Physical and Chemical Stimuli. Advanced Materials Interfaces, 7 (13). p. 2000568. ISSN 2196-7350

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In this work, a flexible, low cost, and cleanroom-free technique to fabricate barium titanate (BaTiO3) hybrid p–n homojunction-based multifunctional sensor for photodetection, strain sensing, and chemiresistive sensing is reported. The n-type BaTiO3 nanofibers are synthesized using electrospinning technique and deposited on the flexible indium tin oxide (ITO) using spin-coating method while p-type BaTiO3 nanoparticles are synthesized using modified sol–gel method and deposited using drop-casting method. Detailed characterization studies are performed to reveal the formation of tetragonal phase p-type nanoparticles and n-type nanofibers of BaTiO3 assembled on the ITO substrate. The fabricated hybrid junction photodetector displays an excellent external quantum efficiency of ≈3500 and photoresponsivity of ≈11 A W−1. Further, the hybrid junction when employed as strain sensor exhibits a gauge factor of 14 and when operated in chemiresistive sensing mode can detect α1-acid glycoprotein with an excellent sensitivity of 49.7 µm−1 in the wide dynamic range of 0.05–10 × 10–6 m and detection limit of 12 × 10–9 m. Detailed studies to understand the underlying mechanism of operation for each application are done. The strategy outlined here can be further employed for sensing various physical and chemical stimuli, paving a new path for developing flexible multifunctional nanoelectronic devices.

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IITH Creators:
IITH CreatorsORCiD
Veeralingam, SushmithaUNSPECIFIED
Ravindranath, Ajay Narayan KondaUNSPECIFIED
Badhulika, SushmeeUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Alpha-1-acid glycoprotein; BaTiO3 nanoparticles; Characterization studies; Electrospinning techniques; External quantum efficiency; Multifunctional sensors; Nanoelectronic devices; Spin-coating method;Costs; Fiber optic chemical sensors; Nanofibers; Nanoparticles; Perovskite; Photodetectors; Sols; Synthesis (chemical); Tin oxides
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 05 Aug 2021 06:14
Last Modified: 05 Aug 2021 06:14
URI: http://raiith.iith.ac.in/id/eprint/8685
Publisher URL: http://doi.org/10.1002/admi.202000568
OA policy: https://v2.sherpa.ac.uk/id/publication/27219
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