标题： 基于混合相TiO₂的非常规比率增强光学氧传感 显示英文标题

标题： Unconventional ratiometric-enhanced optical sensing of oxygen by mixed-phase TiO2

摘要： 我们表明，混合相的二氧化钛（TiO2）可以被有效地用作一种非常规的、无机的、双发射和比率光学传感器来检测O2。金红石和锐钛矿相TiO2的光致发光同时存在，并且它们对O2表现出特殊的反相关光致发光响应，使得它们的比值可以作为与O2浓度相关的测量参数，从而导致实验响应度在构造上大于单相光致发光检测可获得的响应度。给出了该概念的证明，显示了比率方法提供的光学响应度提高了两倍。除了特有的比率增强响应度外，混合相TiO2的其他特性也可以设想为有利于O2光学探测，即：a) 低成本生产，b) 不存在异质成分，c) 自支撑特性。这些特性鼓励尝试其在需要高指示剂数量且价格具有竞争力的应用中的使用，可能还可以解决开发携带发光探针的支撑基质的需要，并避免使用不同组分进行比率传感相关的问题。 显示英文摘要

摘要： We show that mixed-phase titanium dioxide (TiO2) can be effectively employed as an unconventional, inorganic, dual-emitting and ratiometric optical sensor of O2. Simultaneous availability of rutile and anatase TiO2 PL and their peculiar anti-correlated PL responses to O2 allow using their ratio as measurement parameter associated to O2 concentration, leading to an experimental responsivity being by construction larger than the one obtainable for single-phase PL detection. A proof of this concept in given, showing a two-fold enhancement of the optical responsivity provided by the ratiometric approach. Besides the peculiar ratiometric-enhanced responsivity, other characteristics of mixed phase TiO2 can be envisaged as favorable for O2 optical probing, namely: a) low production costs, b) absence of heterogeneous components, c) self-supporting properties. These characteristics encourage experimenting its use for applications requiring high indicator quantities at competitive price, possibly also tackling the need to develop supporting matrixes that carry the luminescent probes and avoiding issues related to the use of different components for ratiometric sensing.