We apply and develop photoluminescence and Raman spectroscopy and microscopy for carbon nanotubes and other inorganic and organic materials
Plastic SERS substrates fabricated by laser-assisted nanoreplication
Efficient and low -cost substrates for surface-enhanced Raman spectroscopy (SERS) are fabricated by the laser-assisted negative replication of a stamp nanostructure onto a thermoplastic polymer and subsequent thin gold film deposition. The replication process can be repeated many times with the same stamp, reproducing nearly defect-free nanostructure features down to ~20 nm. See more ACS Nano 9, 260 (2015).
Bright red luminescence of copper-sulfur cluster molecules
Ligand-stabilized 'Cu12S6' cluster molecules are bright red light emitters i n the solid state at ambient temperature with high photoluminescence quantum yields (>48%) and photostability. These cluster compounds can be a valuable addition to the highly luminescent mononuclear copper-based luminophors which have recently gained increasing interest for their application in organic light emitting devices (OLEDs). See also Chem. Commun.,50, 11043 (2014).
Resonance Raman mapping
Raman mapping (acquiring a series of Raman spectra as a function of continuously tunable laser excitation wavelength) is demonstrated. This an be applied, for instance, to characterize n,m-composition of single-walled carbon nanotubes - an example of materials with an outstanding resonance Raman response. More: Anal. Chem. 85, 4554 (2013).
Carbon nanotubes for high-density, short-channel transistors
Highly enriched samples of semiconducting single walled carbon nanotubes have been prepared by combining polymer-wrapping with size-exclusion chromatography. Using this SWCNTs short-channel transistors were built showing the best performance published so far. More see ACS Nano, Article ASAP.