The adulteration and distribution of pure commercial gasoline remain a global problem because of the lack of a simple method for the rapid on-site detection of adulterated gasoline. Therefore, herein, we propose a simple method, based on highly reflective one-dimensional photonic crystals (1D PCs), for the on-site rapid colorimetric detection of adulterated gasoline by the naked eye. A photo-crosslinked copolymer–titania hybrid (Ti70) with a high refractive index and a photo-crosslinked methyl acrylate (MA)-based polymeric material containing 4-benzoylphenyl acrylate (BPA) (P(MA-co-BPA)) with a low refractive index were synthesized, characterized, and used in the fabrication of an 11-layered 1D PC sensor (Ti70/P(MA-co-BPA) PC). Ti70/P(MA-co-BPA) PC exhibited no color change in pure commercial gasoline. However, when Ti70/P(MA-co-BPA) PC was immersed in methanol, xylene, toluene, and benzene, it rapidly turned from bluish-purple to blue, sky-blue, greenish-yellow, and reddish-orange, respectively, and had high reflectivities. Additionally, when immersed in binary (gasoline/toluene and gasoline/methanol) and ternary (gasoline/toluene/methanol) mixtures, Ti70/P(MA-co-BPA) PC demonstrated significant color changes within short periods (~2 min). Ti70/P(MA-co-BPA) PC exhibited excellent recyclability, which was verified via repeated swelling/deswelling tests for 10 cycles. These results indicate the applicability of the proposed novel Ti70/P(MA-co-BPA) PC for the rapid on-site colorimetric detection of adulterated gasoline by the naked-eye. We believe that the findings of this study will provide considerable insight for developing simple and high-performance 1D PC sensors for practical use and will also serve as a basis for exploring their potential applications.

由于缺乏一种快速现场检测掺假汽油的简单方法，纯商品汽油的掺假和分销仍然是一个全球性问题。因此，在此，我们提出了一种基于高反射一维光子晶体 (1D PC) 的简单方法，用于通过肉眼对掺假汽油进行现场快速比色检测。具有高折射率的光交联共聚物-二氧化钛杂化物 (Ti70) 和含有 4-苯甲酰基苯基丙烯酸酯 (BPA) (P(MA-co-BPA)) 的光交联丙烯酸甲酯 (MA) 基聚合物材料合成、表征和用于制造 11 层 1D PC 传感器 (Ti70/P(MA- co -BPA) PC)。Ti70/P(MA- co-BPA) PC 在纯商业汽油中没有颜色变化。然而，当 Ti70/P(MA- co -BPA)PC 浸入甲醇、二甲苯、甲苯和苯中时，它会迅速从蓝紫色变为蓝色、天蓝色、黄绿色和红橙色。 ，并且具有高反射率。此外，当浸泡在二元（汽油/甲苯和汽油/甲醇）和三元（汽油/甲苯/甲醇）混合物中时，Ti70/P(MA- co -BPA) PC 在短时间内（~2 分钟）表现出显着的颜色变化。Ti70/P(MA- co -BPA) PC 表现出优异的可回收性，这通过 10 个循环的重复溶胀/去溶胀测试得到验证。这些结果表明所提出的新型 Ti70/P(MA- co-BPA) PC，用于通过肉眼快速现场比色检测掺假汽油。我们相信，这项研究的结果将为开发简单且高性能的一维 PC 传感器用于实际应用提供相当大的洞察力，并将作为探索其潜在应用的基础。