Enhancing of the photostability of the fluorescent probes is a crucial task for promoting the performances. A unique polysiloxane-based imidazolium ionic liquid ( PSI ) was found to improve the photostability of the fluorescent probe. In this study, we reported the rational design and synthesis of a novel kind of polysiloxane-based imidazolium derivative ( PSI ) prepared from 1,3-bis(3-aminopropyl)tetramethyldisiloxane and aldehyde through the poly-radziszewski reaction for the first time. PSI was then functionalized by thionaphthalic anhydride ( NA ) to fabricate ionic liquid based fluorescent probe PSI-NA for the detection of SCN − . This work represented the first report for the construction of poly-ionic based fluorescent probes. Compared with small molecule probe, PSI-NA exhibited high stability and further applied in bioimaging and paper-based sensor fields. This work presented a valid approach for enhancing the photostability of fluorescent probes.
In this paper, Au@Ag nanopencil is designed as a multimodality plasmonic nanoprobe based on asymmetric etching for the detection of SCN − and ClO − . Au@Ag nanopencil with Au tip and Au@Ag rod is prepared by asymmetric tailoring of uniformly grown silver-covered gold nanopyramids under the combined effect of partial galvanic replacement and redox reaction. By asymmetric etching in different systems, Au@Ag nanopencil exhibits diversified changes in the plasmonic absorption band: O 2 •− facilitated by SCN − etches Au@Ag rod from the end to the tip, causing a blue shift of the localized surface plasmon resonance (LSPR) peak as the aspect ratio decreases; while the ClO − can retain Au@Ag shell and etch Ag within rod from the tip to the end, causing a redshift of the LSPR peak as the coupling resonance weakens. Based on peak shifts in different directions, a multimodality detection of SCN − and ClO − has been established. The results demonstrate the detection limits of SCN − and ClO − are 160 and 6.7 n m , and the linear ranges are 1–600 µ m and 0.05–13 µ m , respectively. The finely designed Au@Ag nanopencil not only broadens the horizon of designing heterogeneous structures, but also enriches the strategy of constructing multimodality sensing platform.
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