Impact of nitrogen incorporation on pseudomorphic site-controlled quantum dots grown by metalorganic vapor phase epitaxy Appl. Phys. Lett. 97, 072115 (2010); 10.1063/1.3481675InGaN self-assembled quantum dots grown by metalorganic chemical-vapor deposition with indium as the antisurfactant Appl.

UV irradiation of aligned diphenylalanine peptide nanotubes (FF-PNTs) decorated with plasmonic silver nanoparticles (Ag NPs) enables photo-induced surface-enhanced Raman spectroscopy. UV-induced charge transfer facilitates a chemical enhancement that provides up to a 10-fold increase in surface-enhanced Raman intensity and allows the detection of a wide range of small molecules and low Raman cross-section molecules at concentrations as low as 10–13 M. The aligned FF-PNT/Ag NP template further prevents photodegradation of the molecules under investigation. Our results demonstrate that FF-PNTs can be used as an alternative material to semiconductors such as titanium dioxide for photo-induced surface-enhanced Raman spectroscopy applications.

Photodeposition of metallic nanostructures onto ferroelectric surfaces is typically based on patterning local surface reactivity via electric field poling. Here, we demonstrate metal deposition onto substrates which have been chemically patterned via proton exchange (i.e., without polarization reversal). The chemical patterning provides the ability to tailor the

Semiconductor-graphene oxide-based surface enhanced Raman spectroscopy substrates represent a new frontier in the field of surface enhanced Raman spectroscopy (SERS). However, the application of graphene oxide has had limited success due to the poor Raman enhancement factors achievable compared to noble metals. In this work, we report chemical SERS enhancement enabled by the application of electric field to aligned semiconducting peptide nanotube-graphene oxide composite structures during Raman measurements. The technique enables nanomolar detection sensitivity of glucose and nucleobases with up to 10-fold signal enhancement compared to metal-based substrates, which, to our knowledge, is higher than previously reported for semiconductor-based SERS substrates. The increased Raman scattering is assigned to enhanced charge-transfer resonance enabled by work function lowering of the peptide nanotubes. The substrate presented here is easy to make, low cost, sensitive, stable, highly reproducible, and can be used as an excellent platform for biomolecular sensing. These results provide insight into how semiconductor organic peptide nanotubes interact with graphene oxide, which may facilitate chemical biosensing, electronic devices, and energy harvesting applications.

Peptide nanotubes coated with silver nanoparticles and aligned using wettability-patterned substrates provide improved Raman intensity for biosensing applications.