University of Tehran – Page 2 – TechConnect Briefs

Novel ultra-fine hollow needles formed on Silicon membranes

Sanaee Z., Mohajerzadeh S., University of Tehran, IR

In this paper we report the realization of record-small hollow needles. The fabrication process does not need a three-dimensional lithography and uses a high precision deep vertical etching in a hydrogenation assisted ion etching unit. [...]

Nano-porous poly-silicon gated ion selective field effect transistors

Zehfroosh N., Shahmohammdi M., Mohajerzadeh S., University of Tehran, IR

We report the realization of ultra high sensitivity ion-selective field effect transistors (ISFET) devices by means of a nano-porous silicon structures placed on the gate region. Thanks to the presence of a nano-porous polysilicon film [...]

Novel interdigital actuators and sensors based on highly overlapped branched carbon nanotubes

Darbari S., Abdi Y., Ebrahimi A., Mohajerzadeh S., University of Tehran, IR

This work presents a novel interdigital structures of branched carbon nanotubes on silicon-based membranes where the heavy overlapping between neighboring lines leads to a high capacitance. The value of the capacitance is so high (of [...]

Novel Branched nanostructures of Carbon nanotubes on Si substrates suitable for the realization of gas sensors

Abdi Y., Mohajerzadeh S., Sohrabi M.H., Fathipour M., Araghchini M., University of Tehran, IR

A novel tree-like nanostructure of carbon nanotubes was prepared using growth of vertically aligned nanotubes. As an application of the structures we have used them for fabricating the gas sensor. Because of their unique branched [...]

Application of Encapsulated PECVED-grown Carbon Nano-Structure Field-Emission Devices in Nanolithography

Koohsorkhi J., Adbi Y., Mohajerzadeh S., Derakhshandeh J., Hosseinzadegan H., Khakifirooz A., Robertson M.D., University of Tehran, IR

We report a novel technique for submicron and nanolithography using vertically grown nickel seeded carbon nano-structures (CNS) on silicon substrates. The field emission characteristic of carbon nano-tubes is utilized to create nano-scale features. The structure [...]