Fabrication of LSPR sensor using porous titania-glass composite loading Au nanoparticles by photocatalytic deposition method

The porous composite, which consists of the titania nanoparticles of anatase phase and silicate glass, was prepared by use of simple molding and sintering processes. Au nanoparticles were photocatalytically deposited inside the porous composite. In the diffuse reflection spectra of the porous composite loading Au nanoparticles, the LSPR peak owing to Au nanoparticles was clearly observed. The LSPR peak wavelengths showed good relationships to the refractive index of the impregnated liquid. The sensitivities obtained from the relationships were different between the organic solvents and the sucrose aqueous solutions. The porous composite loading Au nanoparticles has great possibility of fabricating effective bio and chemical sensors.