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30 seconds procedure for decoration of titania nanotube with noble metals as metal-dielectric spacer materials towards tunable Purcell Factor and plasmon-coupled emission enhancement

2021; Elsevier BV; Volume: 134; Linguagem: Inglês

10.1016/j.physe.2021.114868

1873-1759

Bebeto Rai, Santhosh Bukka, Venkatesh Srinivasan, Noriyoshi Matsumi, Sai Sathish Ramamurthy,

Gold and Silver Nanoparticles Synthesis and Applications

In this manuscript, we demonstrate rapid decoration of titania nanotube (TiNT) with noble metals using electrochemical synthesis and its application as a hybrid metal-dielectric spacer and cavity material in surface plasmon-coupled emission (SPCE) platform. Using the metal-dielectric spacer architecture consisting of Pt decorated titania nanotubes, [email protected], we have achieved remarkable 104-fold fluorescence signal enhancement in the SPCE platform, owing to the combined effect of low plasmon loss of TiNT, increased local field excitation by Pt nanoparticles and increased activity of TiNT by Pt decoration. We have further carried out finite-difference time-domain (FDTD) simulation to compute the Purcell factor (PF) and correlated it with the enhancement obtained from SPCE experiments. Besides, we have also evaluated the effect of Au and Au–Pt decorated TiNT as a plasmonic substrate.