期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 12, 页码 6934-6940出版社
AMER CHEMICAL SOC
DOI: 10.1021/am302069p
关键词
oligo(p-phenyleneethynylene) (OPE); cholic acid (CholA); organic medium; pH determination; fluorescence films; self-assembled monolayer (SAM)
资金
- Natural Science Foundation of China [20927001, 91027017, 21273141]
- 13115 Project of Shaanxi Province [2010ZDKG-89]
- Program for Changjiang Scholars and Innovative Research Team in University of China [IRT1070]
A self-assembled monolayer (SAM)-based fluorescent film was designed and prepared by chemical immobilization of a novel oligo(p-phenylene- ethynylene) (OPE) with cholic acid moieties at the ends of its side chains (Film 1). As a control, a similar film, Film 2, of which OPE brings no side chains, was also prepared. The structures of the films were characterized by contact angle, XPS, ATR-IR and fluorescence measurements. Fluorescence studies revealed that the emission of Film 1 is sensitive to the presence of trace amount of some inorganic acids in acetone, such as HCl, H2SO4, HNO3, and H3PO4, etc., whereas the acids as studied showed little effect on the emission of Film 2. The difference in the sensing performances of the two films have been rationalized by considering presence or absence of a possible cavity, a substructure appearing above the OPE adlayer which is something like a dimer of cholic acid (CholA) formed at specific environment.
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