Particles comprising hollow surface-enhanced spectroscopy (SES)-active core for long wavelength SERS
Embodiments include a particle comprising a surface enhanced spectroscopy (SES)-active core and a SES-active reporter molecule associated with the SES-active core wherein said particle has a measurable SES spectrum when excited by incident light having a wavelength of at least 1400 nm. Alternative embodiments include methods of manufacturing said particle and methods of tagging a material with said particle. The particle may include an SES-active core which supports plasmon resonance at a wavelength of at least 1400 nm. The particle may comprise an anisotropic core. The particle may include an SES-active reporter molecule which is resonant at one or more wavelengths greater than or equal to 1400 nm.
1. A particle comprising:
a hollow surface-enhanced spectroscopy (SES)-active core comprising;
a hollow metal inner layer;
a dielectric layer formed over the exterior of the hollow inner layer; and
a metal outer layer formed over the exterior of the dielectric layer;
a SES-active reporter molecule doped within the dielectric layer of said SES-active core wherein the SES-active reporter molecule comprises at least one of 4,4′-azopyridine, 4,4′-diethynylazobenzene, 4-(4-quinolylazo)pyridine, 4-(4-ethynylphenylazo)pyridine, 5-(4-pyridylazo)imidazole and 3-(4-pyridylazo)thiophene, 5-(4-pyridylazo)thiazole, and wherein said particle has a measurable SES spectrum when excited by incident light having a wavelength of at least 1400 nm.
2. The particle of claim 1 wherein the SES active core supports plasmon resonance at a wavelength of at least 1400 nm.
3. The particle of claim 2 wherein the SES active core comprises an anisotropic core.
4. The particle of claim 2 wherein the hollow metal inner layer of the SES active core comprises a hollow sphere.
5. The particle of claim 1 wherein the SES-active reporter molecule is resonant at one or more wavelengths greater than or equal to 1400 nm.