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2018-05-11

Mohammad H Zarifi, Benjamin Daniel Wiltshire, Najia Mahdi, Karthik Shankar, Mojgan Daneshmand

A large signal direct current (DC) bias and a small signal microwave bias were simultaneously applied to TiO2 nanotube membranes mounted on a planar microwave resonator. The DC bias modulated the electron concentration in the TiO2 nanotubes, and was varied between 0 and 120 V in this study. ...

2014-06-06

Mohammadpour, Arash, Shankar, Karthik

We present a magnetic field-assisted oxidation and etching process that transforms Ti thin films on arbitrary substrates into self-organized TiO2 nanotube arrays without the direct application of an anodization voltage between the cathode and the Ti film/substrate. In effect, the Ti...

2016-11-10

Samira Farsinezhad, Shyama Prasad Banerjee, Bharath Bangalore Rajeeva, Benjamin D Wiltshire, Himani Sharma, Anton Sura, Arash Mohammadpour, Piyush Kar, Robert Fedosejevs, Karthik Shankar

Localized surface plasmon resonances (LSPR) in TiO2 nanorod and nanotube arrays decorated by gold nanoparticles can be exploited to improve photocatalytic activity, enhance non-linear optical coefficients and increase light harvesting in solar cells. However the LSPR typically has a low quality...

2019-05-14

R Kisslinger, S Riddell, S Savela, P Kar, UK Thakur, S Zeng, K Shankar

2017-12-25

Mohammad Hossein Zarifi, Benjamin Daniel Wiltshire, Najia Mahdi, Piyush Kar, Karthik Shankar, Mojgan Daneshmand

This paper presents a unique integrated UV light sensing concept and introduces a device with a detection limit of 1.96 nW cm−2. The combination of a high quality factor, microwave planar resonator (Q ~ 50,000) with a semiconducting nanomaterial, enables a revolutionary potential paradigm for...