Room temperature gas sensors based on MOF-derived metal oxides: An overview
基于MOF衍生金属氧化物的室温气体传感器：综述
📄 英文摘要 English Abstract
With the current upsurge in hydrogen economies all over the world, an increased demand for improved chemiresistive H2 sensors that are highly responsive and fast acting when exposed to gases is expected. Owing to safety concerns about explosive and highly flammable H2 gas, it is important to develop resistive sensors that can detect the leakage of H2 gas swiftly and selectively. Currently, interest in metal-organic frameworks (MOFs) for gas-sensor applications is increasing due to their open-metal sites, large surface area, and unique surface morphologies. In this research, a highly selective and sensitive H2-sensor was established based on graphitic carbon (GC) anchored spherical Pd@PdO core-shells over γ-Fe2O3 microcube (Pd@PdO/γ-Fe2O3@GC which is termed as S3) heterostructure materials. The combined solvothermal followed by controlled calcination-assisted S3 exhibited a specific morphology with the highest surface area of 79.12 m2 g-1, resulting in fast response and recovery times (21 and 29 s, respectively), and excellent sensing performance (ΔR/R0∼ 96.2 ± 1.5), outstanding long-term stability, and a 100 ppb detection limit when detecting H2-gas at room temperature (mainly in very humid surroundings). This result proves that adsorption sites provided by S3 can promote surface reactions (adsorption and desorption) for ultrasensitive and selective H2gas sensors.
📄 中文摘要 Chinese Abstract
📋 英文结构化总结 English Structured Summary
摘要整理
Header:
Background: With the current upsurge in hydrogen economies all over the world, an increased demand for improved chemiresistive H2 sensors that are highly responsive and fast acting when exposed to gases is expected. Owing to safety concerns about explosive and highly flammable H2 gas, it is important to develop resistive sensors that can detect the leakage of H2 gas swiftly and selectively. Currently, interest in metal-organic frameworks (MOFs) for gas-sensor applications is increasing due to their open-metal sites, large surface area, and unique surface morphologies. In this research, a highly selective and sensitive H2-sensor was established based on graphitic carbon (GC) anchored spherical Pd@PdO core-shells over γ-Fe2O3 microcube (Pd@PdO/γ-Fe2O3@GC which is termed as S3) heterostructure materials.
Header:
Methods: The combined solvothermal followed by controlled calcination-assisted S3 exhibited a specific morphology with the highest surface area of 79.12 m2 g-1.
Header:
Results: The sensor resulted in fast response and recovery times (21 and 29 s, respectively), and excellent sensing performance (ΔR/R0∼ 96.2 ± 1.5), outstanding long-term stability, and a 100 ppb detection limit when detecting H2-gas at room temperature (mainly in very humid surroundings). This result proves that adsorption sites provided by S3 can promote surface reactions (adsorption and desorption) for ultrasensitive and selective H2gas sensors.
Header:
Data Summary: Quantitative results include a surface area of 79.12 m2 g-1, response and recovery times of 21 and 29 s respectively, a sensing performance of ΔR/R0∼ 96.2 ± 1.5, and a detection limit of 100 ppb.
Header:
Conclusions: This result proves that adsorption sites provided by S3 can promote surface reactions (adsorption and desorption) for ultrasensitive and selective H2gas sensors.
Header:
Practical Significance: Owing to safety concerns about explosive and highly flammable H2 gas, it is important to develop resistive sensors that can detect the leakage of H2 gas swiftly and selectively, particularly in very humid surroundings.
📋 中文结构化总结 Chinese Structured Summary
背景:
随着全球氢经济的蓬勃发展，市场对高性能化学电阻式H₂传感器的需求日益增长，要求传感器在接触气体时具有高响应速度和快速响应能力。由于氢气具有爆炸性和高度易燃性的安全隐患，开发能够快速、选择性检测氢气泄漏的电阻式传感器至关重要。目前，金属有机框架（MOFs）因其开放的金属位点、大比表面积和独特的表面形貌，在气体传感器领域的应用受到越来越多的关注。本研究基于石墨碳（GC）锚定的球形Pd@PdO核壳结构负载于γ-Fe₂O₃微立方体（Pd@PdO/γ-Fe₂O₃@GC，简称S3）异质结构材料，构建了一种高选择性和高灵敏度的H₂传感器。
方法:
采用溶剂热法结合可控煅烧辅助制备的S3材料呈现出特定形貌，其比表面积最高可达79.12 m² g⁻¹。
结果:
该传感器在室温下检测H₂气体时表现出快速的响应和恢复时间（分别为21秒和29秒），具有优异的传感性能（ΔR/R₀∼ 96.2 ± 1.5），出色的长期稳定性，以及在极高湿度环境下100 ppb的检测限。该结果表明，S3提供的吸附位点能够促进表面反应（吸附和解吸），从而实现超灵敏和选择性的H₂气体传感器。
数据摘要:
定量结果包括：比表面积为79.12 m² g⁻¹，响应时间和恢复时间分别为21秒和29秒，传感性能为ΔR/R₀∼ 96.2 ± 1.5，检测限为100 ppb。
结论:
该结果表明，S3提供的吸附位点能够促进表面反应（吸附和解吸），从而实现超灵敏和选择性的H₂气体传感器。
实际意义:
由于氢气具有爆炸性和高度易燃性的安全隐患，开发能够快速、选择性检测氢气泄漏的电阻式传感器至关重要，尤其是在极高湿度环境下。