Abstract:Semiconducting materials
are increasingly proposed as alternatives
to noble metal nanomaterials to enhance Raman scattering. We demonstrate
that bioinspired semiconducting diphenylalanine peptide nanotubes
annealed through a reported structural transition can support Raman
detection of 10–7 M concentrations for a range of
molecules including mononucleotides. The enhancement is attributed
to the introduction of electronic states below the conduction band
that facilitate charge transfer to the analyte molecule. … Show more
“…50 Aer cycling, the C-C peak appears at 284.8 eV, 10,51 and the lowest energy peak of 282.4 eV is attributed to environmental contamination. 52 Fig. 5e shows C 1s spectrum of ferrocene/AC cathode before and aer cycling.…”
Organic and inorganic materials have their own advantages and limitations, and new properties can be displayed in organic–inorganic hybrid materials by uniformly combining the two categories of materials at small scale.
“…50 Aer cycling, the C-C peak appears at 284.8 eV, 10,51 and the lowest energy peak of 282.4 eV is attributed to environmental contamination. 52 Fig. 5e shows C 1s spectrum of ferrocene/AC cathode before and aer cycling.…”
Organic and inorganic materials have their own advantages and limitations, and new properties can be displayed in organic–inorganic hybrid materials by uniformly combining the two categories of materials at small scale.
“…5C). 167 Apart from small molecular organic semiconductors, a few semiconductive organic substrates, includ-ing π-conjugated polymers 168,169 and peptide nanotubes, 170 are also reported.…”
Surface-enhanced Raman scattering (SERS) is a powerful and non-invasive spectroscopic technique that can provide rich and specific chemical fingerprint information for various target molecules through effective SERS substrates. In view...
“…The enhancement is attributed to the introduction of electronic states below the conduction band that facilitate charge transfer to the analyte molecule. [ 29 ] Thus, in this study, we have investigated the influence of both temperature and water content on Fmoc‐FF gel formation. We have found that microsphere formation can be tuned by increasing the water content and by heating the solution.…”
Self-assembling nanostructured peptide gels are promising materials for sensing, drug delivery, and energy harvesting. Of particular interest are short diphenylalanine (FF) peptides modified with 9-fluorenylmethyloxycarbonyl (Fmoc), which promotes the association of the peptide building blocks. Fmoc-FF gels generally form fibrous networks and while other structures have been demonstrated, further control of the gelation and resulting ordered three-dimensional structures potentially offers new possibilities in tissue engineering, sensing, and drug release applications. Herein, we report that the structure tunability of Fmoc-FF gels can be achieved by controlling the water content and the temperature. We further explore the incorporation of metal nanoparticles in the formation of the gel to enable optical sensing applications based on hybrid Fmoc-FF-nanoparticle microspheres. Finally, fluorescence lifetime imaging microscopy reveals a correlation between lifetime and reduced bandgap, in support of a semiconductor-induced charge transfer mechanism that might also increase the stability of an excited state of a probe molecule. The observations potentially further widen the use of these peptide materials in bioimaging and sensing applications.
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