扩散
折射率
材料科学
光子晶体
分子
分析物
吸附
化学物理
波长
反射(计算机编程)
光子学
解吸
分析化学(期刊)
纳米技术
化学
光电子学
物理化学
色谱法
有机化学
物理
计算机科学
热力学
程序设计语言
作者
Xueying Fan,Miao Xu,Weizhe Liu,Aleksandr A. Kuchmizhak,Lorenzo Pattelli,Yao Li,Hongbo Xü
出处
期刊:ACS materials letters
[American Chemical Society]
日期:2023-05-13
卷期号:5 (6): 1703-1709
被引量:9
标识
DOI:10.1021/acsmaterialslett.3c00203
摘要
Traditional environmental photonic sensing based on the balanced reflection of a photonic structure can hardly be applied to distinguish molecular size and homologues, since the refractive index change introduced by these analytes can be too similar to be unambiguously distinguished. Here, a sensing method based on the pore size selectivity and organics adsorption–desorption capacity of self-assembled ZIF-8 photonics crystal is demonstrated, which can tell apart different molecular sizes, homologues, and organics with similar structures and physical properties. Specificity is improved by the inherent relationships between the pore size of ZIF-8 metal–organic frameworks and the associated molecular diffusion rates in the pores, so that the combination of the observed peak shift and recovery time are unique to each analyte. Using this method, selective detection of molecular size is also demonstrated in the case of linear vs cyclic molecules, since only the former can penetrate inside the ZIF-8 pores to induce a large wavelength shift. The reflection peak shift caused by the linear molecules was found to be about 30–40 nm, an order of magnitude larger compared to those for the cyclic molecules. A relationship between the diffusion rate of linear molecules in ZIF-8 pore and the recovery time of photonic crystal reflective peak is further established, linking the recovery time and the linear molecular diffusion coefficient. Finally, different linear molecules are identified by their associated recovery time to detect homologues or organics with similar refractive index.
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