混合相TiO2的非传统比率增强光学氧传感
Unconventional ratiometric-enhanced optical sensing of oxygen by mixed-phase TiO2
摘要：
我们表明，混合相钛白（TiO 2）可以有效地采用作为一种非常规的，无机的，双发射和比率光学传感器的O2。金红石型和金红石型TiO 2 PL和它们对O2的特有的反相关PL响应的同时可用性允许使用它们的比率作为与O2浓度相关的测量参数，导致实验响应度通过构造大于单相PL检测可获得的响应度。给出了这一概念的证明，显示了由比率法提供的光学响应度的两倍增强。除了独特的比率增强响应度之外，混合相TiO 2的其他特性可以被设想为有利于O2光学探测，即：a）低生产成本，b）不存在异质组分，c）自支撑特性。这些特性鼓励以具有竞争力的价格试验其用于需要高指示剂量的应用，还可能解决开发携带发光探针的支持基质的需要，并避免与使用不同组分进行比率传感相关的问题。
英文摘要：
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.
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