ZnO nanotube waveguide arrays on graphene films for local optical excitation on biological cells

Abstract

We report on scalable and position-controlled optical nanoprobe arrays using ZnO nanotube waveguides on graphene films for use in local optical excitation. For the waveguide fabrication, position-controlled and well-ordered ZnO nanotube arrays were grown on chemical vapor deposited graphene films with a submicron patterned mask layer and Au prepared between the interspace of nanotubes. Mammalian cells were cultured on the nanotube waveguide arrays and were locally excited by light illuminated through the nanotubes. Fluorescence and optogenetic signals could be excited through the optical nanoprobes. This method offers the ability to investigate cellular behavior with a high spatial resolution that surpasses the current limitation.

Effect of (Ce, Al) co-doped ZnO thin films on the Schottky diode properties fabricated using the sol-gel spin coating

“…Zinc oxide (ZnO) semiconductor is one of the promising materials in many applications for examples: light emitting diodes (LEDs) [1] chemical and gas sensors [2,3], optical waveguides [4,5], solar cells [6,7], Schottky diodes [8,9,10], laser diodes [11], UV-photodiodes [12,13] and UV-light emitters [14,15]. ZnO has a high direct band gap of 3.37 eV which make it good for photonic applications in the UV and blue spectral range.…”