Enhanced low-concentration CO2 sensing performance for Sr- and Co-doped LaFeO3 thick film sensors by oxygen-enriched atmosphere after vacuum annealing

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-04-03 DOI:10.1016/j.snb.2025.137736

Xiaohong Su, Haotian Shan, Yanting Tian, Wei Guo, Peng Zhao, Lin Xue, Yongjia Zhang

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Abstract

This study investigates the enhancement of low-concentration CO₂ sensing performance in Sr- and Co-doped LaFeO₃ (LFO) thick film sensors through a combined treatment involving vacuum annealing and oxygen-rich atmosphere exposure. La_0.8Sr_0.2FeO₃ (LSFO) and LaFe_0.8Co_0.2O₃ (LFCO) porous microspheres were synthesized via hydrothermal method and characterized using XRD, SEM, XPS, and Raman spectroscopy. The optimized LFCO sensor demonstrated a high response value of 1.158 at 110°C, with rapid response/recovery times and excellent moisture resistance. The improved sensitivity was attributed to increased surface oxygen vacancies from vacuum annealing, promoting oxygen adsorption and electron transfer with CO₂. First-principles calculations confirmed the role of O₂ adsorption in enhancing the number of transferred electrons for CO₂ molecules, thus improving gas sensing performance. This study presents a practical approach for developing cost-effective, high-performance CO₂ sensors with enhanced sensitivity and stability.

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.