Bismuth-doping Induced Enhanced Humidity Sensing Properties of Spinel NiFe₂O₄ Nanoparticles

Author(s):Show less -

Manjunatha, K. ; Hsu, Tsu-En ; Chiu, Hsin-Hao ; Ho, Ming-Kang ; Chethan, B. ; Oliveira, Marisa C. ; Longo, Elson ; Ribeiro, Renan A. P. ; Yu, Shih-Lung ; Cheng, Chia-Liang ; Nagabhushana, H. ; Chen, Meng-Chu ; Wu, Sheng Yun

• Document type: Journal article
• Source: SENSORS AND ACTUATORS B-CHEMICAL; v. 422, p. 11-pg., 2025-01-01.

Abstract

Bi-doped NiFe2O4 nanoparticles were tested for humidity detection at various RH levels at room temperature. The findings indicated that sensors with higher Bi concentrations, particularly the ones with 20 % Bi doping, showed significantly enhanced sensing response-up to 97 %, a sixfold increase compared to undoped sensors. This significant improvement suggests that Bi contributes to synergistic effects that boost sensor performance. Density Functional Theory (DFT) calculations support this by showing that Bi introduces acceptor electronic states, heightening electrical responsiveness to moisture. These Bi-doped sensors exhibit quick response times, high accuracy, negligible hysteresis, and impressive stability, making them promising candidates for reliable humidity detection. (AU)

• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 22/16840-7 - ROS generation and enhanced biocide activity of AgNbO3 semiconductor: an in-depth theoretical perspective
• Grantee: Marisa Carvalho de Oliveira
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 21/01651-1 - CDMF - Functional Materials Development Center: theoretical study of multifunctional materials with potential antiviral application
• Grantee: Marisa Carvalho de Oliveira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral