AI 中文总结
本研究提出以混合相TiO₂纳米颗粒为光学传感器，实现室温下30-500 ppm浓度范围的超灵敏O₂检测，相比常用方法兼具成本效益与室温低浓度检测优势。
AI 中文摘要
氧气（O₂）检测通常采用基于荧光的光学传感器或化学电阻式传感器，每种方法各有局限。光学传感器需要对特定有机荧光物质进行分子设计与合成，成本高且稳定性较差；化学电阻式传感器虽使用成本更低的无机材料，但对ppm级浓度O₂的灵敏度低，且无法在室温下工作。本研究展示，利用二氧化钛（TiO₂）混合相纳米颗粒作为光学传感器，可在室温下检测低至几十ppm浓度的O₂。通过同时测量金红石相和锐钛矿相纳米颗粒的光致发光，实现了30-500 ppm浓度范围的O₂检测，响应曲线用Langmuir函数精准校准，还展现出良好的响应及时性与可重复性。与常用方法相比，该氧光学传感方法具备两大固有优势：一是所用敏感材料比光学传感常用材料更具成本效益、易制备且稳定；二是在低O₂浓度范围的室温检测效率更高，优于多数常用化学电阻式传感器。
英文摘要
Oxygen (O2) detection is commonly carried out via either fluorescence-based optical sensors or chemoresistive sensors. Each approach has its own limitations. Optical sensors require the molecular design and synthesis of specific organic fluorescent species which can be costly and less stable. Chemoresistive sensors, despite presenting advantages in using more cost-effective inorganic materials, are often limited by low sensitivities to O2 at ppm concentrations and by their inability to operate at room temperature. In this work, we demonstrate the detection of O2 at concentrations as low as a few tens of ppm at room temperature by using titanium dioxide (TiO2) mixed-phase nanoparticles as optical sensors. By simultaneously measuring the photoluminescence of nanoparticles in rutile and anatase phase, O2 detection was achieved in the concentration range of 30-500 ppm, with a response curve well-calibrated by a Langmuir function. Good response promptness and repeatability are also demonstrated. This approach to O2 optical sensing offers two intrinsic advantages over the most commonly used methodologies: (1) use of a cost-effective, easy-to-prepare and stable of the sensitive material compared to those typically employed in optical sensing, and (2) improved room-temperature detection efficiency in the low O2 concentration range, outperforming most commonly-used chemoresistive sensors.
Journal refSensors & Actuators: B. Chemical 433 (2025) 137560
