Advancing humidity sensing and magnetocaloric properties of spinel structural CoCr2O4 nanoparticles achieved via innovative bismuth doping by combustion synthesis

Ho, M-K and Chiu, H-H and Hsu, T-E and Chethan, B and Yu, S-L and Jheng, C-Y and Chin, C-E and Selvam, R and V, JA and Cheng, C-L and Nagabhushana, H and Manjunatha, K and Wu, SY (2024) Advancing humidity sensing and magnetocaloric properties of spinel structural CoCr2O4 nanoparticles achieved via innovative bismuth doping by combustion synthesis. In: Materials Today Chemistry, 35 .

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Abstract

This study explores the influence of Bi-doping on Co1-xBixCr2O4 (x = 0�0.2) nanoparticles synthesized via the solution combustion method, focusing on humidity sensing and magnetocaloric effects. The investigation reveals two magnetic transitions: the Curie temperature (TC) marks the paramagnetic to ferrimagnetic shift, while the spiral transition temperature (TS) indicates a spiral spin order transition. Magnetization measurements demonstrate that ��SM and relative cooling power (RCP) values vary with Bi concentration, making these nanoparticles viable for magnetic refrigeration above liquid nitrogen temperatures. Analyzing magnetic entropy variation, the modified Arrott plots and Kouvel-Fisher approach affirm second-order phase transitions. The sensing response exhibits growth alongside relative humidity (RH) and Bi concentration, culminating in an impressive �97.56 sensing response for the 20 Bi-doped sample. This heightened humidity sensing performance with increased Bi content can be attributed to synergistic effects. These results highlight the potential of 20 Bi-doped Co1-xBixCr2O4 nanoparticles as promising contenders for enduring and practical humidity sensing applications. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Materials Today Chemistry
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Author.
Keywords:	Bismuth compounds; Chromium compounds; Cobalt compounds; Liquefied gases; Magnetocaloric effects; Synthesis (chemical); Tropics, Bi-doped; Ferrimagnetic transition; Ferrimagnetics; Humidity sensing; Humidity sensing property; Magnetocaloric properties; Sensing response; Solution combustion method; Spinel structure; Temperature-dependent raman, Nanoparticles
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	01 Mar 2024 09:05
Last Modified:	01 Mar 2024 09:05
URI:	https://eprints.iisc.ac.in/id/eprint/83964

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