用于射频氮氧化物剂量计的钡基氮氧化物储存材料的介电光谱和操作DRIFTS分析
{"_":"Combined Dielectric Spectroscopy and Operando DRIFTS Analysis of Ba-Based NO Storage Materials for Radio-Frequency-Based NO Dosimeters.","sub":["x","x"]}
摘要(中文译文)
本研究采用微波腔微扰、原位漫反射红外光谱（operando DRIFTS）和阻抗谱技术，考察了Pt/Ba-AlO NO储存材料的介电行为与NO储存特性，并评估其在射频基NO剂量计型传感器中的适用性。介电损耗（″）被确定为NO储存最敏感的指示指标，其与累积NO剂量及Ba储存位点利用率均呈现明显的线性相关。约35%的可用Ba位点参与亚硝酸盐和硝酸盐的形成，且绝对介电损耗响应随NOx储存催化剂中Ba含量的增加而成比例增大。相比之下，介电常数（′）仅表现出微小变化，且主要受温度影响。温度依赖性实验表明，在350 °C以下NO储存稳定、脱附可忽略，而400 °C时显著的脱附过程明显限制了线性剂量计行为。对Pt/Ba-AlO功能薄膜的原位DRIFTS测量证实了亚硝酸盐和硝酸盐的温度依赖性形成，其中硝酸盐在较高温度下主导NO储存。电容测量显示NO储存期间电容略有增加，表明介电常数适度增大。总体而言，Pt/Ba-AlO NO储存材料表现出稳健且可定量解析的介电响应，非常适合用于射频基剂量计型NO传感。
Abstract
This study investigates the dielectric behavior and NO storage properties of Pt/Ba-AlO NO storage materials using microwave cavity perturbation, operando DRIFTS, and impedance spectroscopy with respect to their applicability in a radio-frequency-based NO dosimeter-type sensor. Dielectric losses (″) are identified as the most sensitive indicator of NO storage, exhibiting a clear linear correlation with both the accumulated NO dose and the utilization of Ba storage sites. Approximately 35% of the available Ba sites participate in nitrite and nitrate formation, and the absolute dielectric loss response increases proportionally with the Ba content of the NOx storage catalyst. In contrast, the permittivity (') shows only minor changes, which are mainly influenced by temperature. Temperature-dependent experiments reveal stable NO storage with negligible desorption up to 350 °C, whereas pronounced desorption processes at 400 °C significantly limit the linear dosimeter behavior. Operando DRIFTS measurements on Pt/Ba-AlO functional films confirm temperature-dependent formation of nitrites and nitrates, with nitrates dominating the NO storage at elevated temperatures. Capacitance measurements show a slight increase during NO storage, indicating a moderate increase in permittivity. Overall, Pt/Ba-AlO NO storage materials exhibit a robust, quantitatively interpretable dielectric response that is well suited for radio-frequency-based, dosimeter-type NO sensing.
如何引用
AMA
Daniela Schönauer-Kamin, Fabian Fütterer, Johanna Baumgärtner, Thomas Wöhrl, Gunter Hagen, Ralf Moos. {"_":"Combined Dielectric Spectroscopy and Operando DRIFTS Analysis of Ba-Based NO Storage Materials for Radio-Frequency-Based NO Dosimeters.","sub":["x","x"]}. Sensors (Basel, Switzerland). 2026; doi:10.3390/s26103203.
APA
Daniela Schönauer-Kamin, Fabian Fütterer, Johanna Baumgärtner, Thomas Wöhrl, Gunter Hagen, Ralf Moos (2026). {"_":"Combined Dielectric Spectroscopy and Operando DRIFTS Analysis of Ba-Based NO Storage Materials for Radio-Frequency-Based NO Dosimeters.","sub":["x","x"]}. Sensors (Basel, Switzerland). https://doi.org/10.3390/s26103203
GB/T 7714
Daniela Schönauer-Kamin, Fabian Fütterer, Johanna Baumgärtner, Thomas Wöhrl, Gunter Hagen, Ralf Moos. {"_":"Combined Dielectric Spectroscopy and Operando DRIFTS Analysis of Ba-Based NO Storage Materials for Radio-Frequency-Based NO Dosimeters.","sub":["x","x"]}[J]. Sensors (Basel, Switzerland), 2026 doi:10.3390/s26103203.
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