Sensing of explosive vapor by hybrid perovskites: Effect of dimensionality
Sensing of explosive vapor by hybrid perovskites: Effect of dimensionality
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DOI：
10.1063/5.0011229
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发表时间：
2020-07-01
期刊：
影响因子：
6.1
通讯作者：
Samuel, I. D. W.
中科院分区：
文献类型：
--
作者：
Harwell, J. R.;Glackin, J. M. E.;Samuel, I. D. W.
卤化铅钙钛矿对于许多光电器件来说是非常有前途的材料。它们是低成本、光稳定且强光致发光的材料，但迄今为止在传感方面的研究还很少。在本文中，我们探索混合钙钛矿作为爆炸性蒸气的传感器。我们调整钙钛矿薄膜的维度，以改变其激子结合能和薄膜形态，并探索其对传感响应的影响。我们发现从 3D 状态调整到 0D 状态会增加钙钛矿薄膜对二硝基甲苯 (DNT)（地雷中常见的分子）蒸气的 PL 猝灭响应。我们发现 0D 钙钛矿纳米晶体薄膜可作为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 淬灭响应可以轻松逆转，从而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。
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.