Lead halide perovskites are very promising materials for many optoelectronic devices. They are low cost, photostable, and strongly photoluminescent materials, but so far have been little studied for sensing. In this article, we explore hybrid perovskites as sensors for explosive vapor. We tune the dimensionality of perovskite films in order to modify their exciton binding energy and film morphology and explore the effect on sensing response. We find that tuning from the 3D to the 0D regime increases the PL quenching response of perovskite films to the vapor of dinitrotoluene (DNT)—a molecule commonly found in landmines. We find that films of 0D perovskite nanocrystals work as sensitive and stable sensors, with strong PL responses to DNT molecules at concentrations in the parts per billion range. The PL quenching response can easily be reversed, making the sensors reusable. We compare the response to several explosive vapors and find that the response is strongest for DNT. These results show that hybrid perovskites have great potential for vapor sensing applications.

中文翻译：

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混合钙钛矿对爆炸性蒸汽的感测：维数的影响

卤化铅钙钛矿是用于许多光电器件的非常有前途的材料。它们是低成本、光稳定性和强光致发光材料，但迄今为止很少有人对其进行传感研究。在本文中，我们探索混合钙钛矿作为爆炸性蒸汽传感器。我们调整钙钛矿薄膜的维数，以修改它们的激子结合能和薄膜形态，并探索对传感响应的影响。我们发现，从 3D 到 0D 状态的调整增加了钙钛矿薄膜对二硝基甲苯 (DNT) 蒸气的 PL 猝灭响应，二硝基甲苯 (DNT) 是一种常见于地雷中的分子。我们发现 0D 钙钛矿纳米晶体薄膜可用作敏感且稳定的传感器，对浓度在十亿分之一范围内的 DNT 分子具有强烈的 PL 响应。PL 猝灭反应很容易逆转，使传感器可重复使用。我们比较了对几种爆炸性蒸气的响应，发现 DNT 的响应最强。这些结果表明，混合钙钛矿在蒸汽传感应用中具有巨大的潜力。