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Behavioral remodeling of perovskite BiFeO3 by Ag-doping strategies for enhanced and ppb level acetone sensing performance: An advanced enlightenment for selectivity and sensing mechanism

•Phase pure BiFeO3/Bi1-xAgxFeO3 nanoparticles were synthesized in cost effective sol-gel method.•Ag-doping enhances the response performance by 1.8-fold with 5-fold faster detection time (8 s).•Selectively detect 500 ppb acetone (R∼1.5).•Ion – dipole/dipole – dipole interaction process, sensitizatio...

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Published in:Applied materials today 2022-12, Vol.29, p.101611, Article 101611
Main Authors: Neogi, Samya, Ghosh, Ranajit
Format: Article
Language:English
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Summary:•Phase pure BiFeO3/Bi1-xAgxFeO3 nanoparticles were synthesized in cost effective sol-gel method.•Ag-doping enhances the response performance by 1.8-fold with 5-fold faster detection time (8 s).•Selectively detect 500 ppb acetone (R∼1.5).•Ion – dipole/dipole – dipole interaction process, sensitization effect paved the path of selectivity and sensing mechanism beyond conventional way. Improvement of the catalytic reactions on the sensing surface or modulation of charge carriers of the sensing material are the most favorable ways to enhance sensing performance for a chemi-resistive sensor. Incorporation of noble metals can enhance the sensing features of chemi-resistive type sensors by synergistic effect of chemical (catalytic effect) or electronic (tuning of charge carrier concentration) sensitization. In this view, the present study performs a behavioral remodeling of sol-gel synthesized BiFeO3 (BFO) chemi-resistive sensor by low-cost Ag-doping strategies to enhance its acetone sensing performance with removal of irreversibility. The Ag-doped BFO (Bi0.9Ag0.1FeO3) sensor can selectively detect acetone vapor (Rcross = RAcetone/RXylene: 17; RAcetone/RHexane: 08; RAcetone/RToluene: 05; RAcetone/RMethanol: 2.5; RAcetone/REthanol: 2.2) operating at 350°C. Ag-BFO sample shows an enhancement (1.8-fold) in response (R∼22) value with 5-fold faster response time (τres∼8s) for 50 ppm acetone exposure compared to pristine BFO (R∼12, τres∼45s). Excellent repeatability over 09 loop character with high degree of long-term stability for 300 days and ppb level detection (500 ppb) favorable to biomarker recognition for critical diseases confirms the commercial viability of Ag-doped BFO sample. The ion-dipole (highest interaction energy, Ei-d = -1.02 × 10−19 J for acetone)/dipole-dipole coupling, the ferroelectric nature of BiFeO3 and sensitization effect (by metallic Ag-phase) has paved the path for revealing the selectivity and sensing mechanism for the prepared prototype in an innovative way. [Display omitted]
ISSN:2352-9407
2352-9415
DOI:10.1016/j.apmt.2022.101611