期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 9, 页码 4960-4965出版社
AMER CHEMICAL SOC
DOI: 10.1021/am3013328
关键词
polycyclic aromatic hydrocarbon; sensor; detection; nonpolar; polar; humidity
资金
- FP7-Health Program under LCAOS [258868]
- FP7's ERC grant under DIAG-CANCER [256639]
- DFG Priority Program [SPP 1355]
- ESF Project GOSPEL [09-EuroGRAPHENE-FP-001]
- EU Project GENIUS
- ERC grant
- European Research Council (ERC) [256639] Funding Source: European Research Council (ERC)
Real-world samples contain reducing and oxidizing chemical agents as well as large and small (bio)molecules, which are polar or nonpolar in nature. Sensing nonpolar analytes, which is of paramount importance for a wide variety of applications, is generally more difficult to achieve than sensing polar analytes. Here, we report on empirical observations of a unique polycyclic aromatic hydrocarbon derivative, referred as PAH-A, whose structure has a triangular-shaped aromatic core (with a carbon number of 60) and contains hydrophobic mesogens terminated with hydrophobic alkyl chains. We show that films made of PAR-A enable excellent sensitivity to nonpolar analytes, compared to polar analytes, in a setting of 5-40% counteracting relative humidity. This finding is based on monitoring the changes in the physical/optical properties of thin PAH-A films upon exposure to nonpolar and polar analytes, by means of quartz crystal microbalance and spectroscopic ellipsometry measurements. A comparison with other polycyclic aromatic hydrocarbon derivatives with different cores or organic functionalities is provided and discussed.
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